RBB FUND INC
497, 1999-01-14
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                                       RBB
                             FAMILY OF MUTUAL FUNDS
                         A TRADITION OF BUILDING WEALTH

                                 [LOGO OMITTED]


                         GOVERNMENT SECURITIES PORTFOLIO
                                   (RBB CLASS)




                                   PROSPECTUS
                                December 29, 1998

================================================================================
<PAGE>

                                  THE RBB CLASS
                              OF THE RBB FUND, INC.

     This  Prospectus  offers one class of shares in the  Government  Securities
Portfolio of The RBB Fund, Inc. (the "Fund").  The investment  objective of this
portfolio is as follows:

     GOVERNMENT  SECURITIES  PORTFOLIO--to  provide the highest level of current
income consistent with liquidity and a low risk to principal from a portfolio of
U.S. Government obligations.  It seeks to achieve such objective by investing in
obligations  issued or  guaranteed  by the U.S.  Treasury  or other  agencies or
instrumentalities of the U.S. Government.

     SHARES OF THE FUND ARE NOT DEPOSITS OR  OBLIGATIONS  OF, OR  GUARANTEED  OR
ENDORSED BY PNC BANK, NATIONAL ASSOCIATION, PFPC TRUST COMPANY OR ANY OTHER BANK
AND  SHARES  ARE  NOT  FEDERALLY   INSURED  BY  THE  FEDERAL  DEPOSIT  INSURANCE
CORPORATION,  THE FEDERAL  RESERVE  BOARD,  OR ANY OTHER AGENCY.  INVESTMENTS IN
SHARES OF THE FUND INVOLVE  INVESTMENT  RISKS,  INCLUDING  THE POSSIBLE  LOSS OF
PRINCIPAL.

     This Prospectus contains  information that a prospective  investor needs to
know before  investing.  Please  keep it for future  reference.  A Statement  of
Additional  Information,  dated  December  29,  1998,  has been  filed  with the
Securities  and Exchange  Commission  and is  incorporated  by reference in this
Prospectus.  It may be obtained  free of charge  from the Fund by calling  (800)
430-9618.  The  Prospectus  and  Statement of  Additional  Information  are also
available for reference, along with other related materials, on the SEC Internet
Web Site (http://www.sec.gov).



- --------------------------------------------------------------------------------
THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THIS
PROSPECTUS.   ANY   REPRESENTATION  TO  THE  CONTRARY  IS  A  CRIMINAL  OFFENSE.
- --------------------------------------------------------------------------------

PROSPECTUS                                                     December 29, 1998

<PAGE>

INTRODUCTION
- --------------------------------------------------------------------------------

     The  RBB  Fund,  Inc.  is  an  open-end   management   investment   company
incorporated under the laws of the State of Maryland on February 29, 1988 and is
currently  operating  or  proposing  to operate  seventeen  separate  investment
portfolios.  The class  (the "RBB  Class" or the  "Class")  of shares  (the "RBB
Shares" or  "Shares")  offered by this  Prospectus  represents  interests in the
Government Securities Portfolio (the "Portfolio").

FUND MANAGEMENT

     BlackRock  Institutional  Management Corporation ("BIMC"), a majority-owned
subsidiary  of  PFPCTrust  Company,  serves  as the  investment  adviser  to the
Portfolio.  PNC Bank  serves  as the  custodian  to the  Fund.  PNC Bank and its
subsidiaries   currently   manage  over  $45.9  billion  of  assets,   of  which
approximately $31.4 billion are mutual funds.

     PFPC Inc.  ("PFPC") serves as the  administrator  and transfer and dividend
disbursing agent to the Fund.

THE DISTRIBUTOR

     Provident  Distributors,  Inc.  (the  "Distributor"),  serves as the Fund's
distributor.

INVESTMENT PORTFOLIO

     The  investment  objective  of the  Government  Securities  Portfolio is to
provide the highest level of current income  consistent with liquidity and a low
risk to principal from a portfolio of U.S. Government  obligations.  It seeks to
achieve this objective by investing in  obligations  issued or guaranteed by the
U.S. Treasury or other agencies or instrumentalities of the U.S. Government.

EXPENSE TABLE

     The Fee Table  below  contains  a  summary  of  annual  operating  expenses
incurred  by the RBB Shares of the  Portfolio  (after fee  waivers  and  expense
reimbursements)  for the fiscal year ended August 31, 1998,  as a percentage  of
average daily net assets. An example based on the summary is also shown.

SHAREHOLDER TRANSACTION EXPENSES
Maximum Sales Charge Imposed on Purchases 
     (as percentage of offering price) .........................  4.75%

ANNUAL FUND OPERATING EXPENSES (RBB CLASS)
     (AS A PERCENTAGE OF AVERAGE NET ASSETS)

Management Fees (after waivers)(1) .............................     0%
12b-1 Fees .....................................................   .40%
Other Expenses (after waivers)(1) ..............................   .30%
                                                                  ----
Total Fund Operating Expenses (after waivers)(1) ...............   .70%
                                                                  ====

(1)  Management  Fees and 12b-1 Fees are each based on average  daily net assets
     and are calculated  daily and paid monthly.  Before expense  reimbursements
     and  waivers  for the  Portfolio,  Management  Fees  would be  .40%,  Other
     Expenses would be .91%, and Total Fund Operating Expenses would be 1.71%.

EXAMPLE

     An investor would pay the following  expenses on a $1,000 investment in the
Portfolio,  assuming (1) a 5% annual  return,  and (2)  redemption at the end of
each time period:

                                       2
<PAGE>

                                   ONE YEAR  THREE YEARS  FIVE YEARS  TEN YEARS
                                   --------  -----------  ----------  ---------
Government Securities ...........     $7*       $22*         $39*        $87*

*Reflects the  imposition  of the maximum  sales  charge at the beginning of the
 period.

     The Example in the Fee Table assumes that all  dividends and  distributions
are  reinvested  and  that the  amounts  listed  under  "Annual  Fund  Operating
Expenses"  remain  the  same in the  years  shown.  THE  EXAMPLE  SHOULD  NOT BE
CONSIDERED A  REPRESENTATION  OF PAST OR FUTURE EXPENSES AND ACTUAL EXPENSES MAY
BE GREATER OR LESS THAN THOSE SHOWN. Long-term shareholders of the Portfolio may
pay more than the  economic  equivalent  of the maximum  front-end  sales charge
permitted by the National Association of Securities Dealers, Inc.

     The Fee Table is  designed  to  assist an  investor  in  understanding  the
various  costs and expenses  that a holder of RBB Shares in the  Portfolio  will
bear  directly or  indirectly.  (For more complete  descriptions  of the various
costs and expenses,  see "Management"  and  "Distribution of Shares" below.) The
Fee Table  reflects a voluntary  waiver of  Management  Fees for the  Portfolio.
However,  there can be no assurance that any future  waivers of Management  Fees
(if any) will not vary from the figure  reflected in the Fee Table. In addition,
the investment adviser is currently  voluntarily assuming additional expenses of
the  Portfolio.  There can be no  assurance  that the  investment  adviser  will
continue to assume such  expenses.  Assumption of additional  expenses will have
the effect of lowering a Portfolio's  overall  expense ratio and  increasing its
yield to  investors.  The  expense  figures  are based on actual  costs and fees
charged to the Portfolio.

OFFERING PRICE

     RBB Shares will be offered to the public at the next  determined  net asset
value  after  receipt by PFPC,  the Fund's  transfer  agent,  of an order plus a
maximum sales charge of 4.75% of the offering price on single  purchases of less
than  $100,000.  The sales  charge is  reduced  on a  graduated  scale on single
purchases of $100,000 or more.

MINIMUM INITIAL AND SUBSEQUENT INVESTMENTS

     The  minimum  initial  investment  for RBB  Shares  is  $1,000.  Subsequent
investments must be $100 or more. See "How to Purchase Shares."

REDEMPTION

     Shares may be redeemed at any time at their net asset value next determined
after receipt by PFPC of a redemption request. The Fund reserves the right, upon
30 days written notice, to redeem an account consisting of RBB Shares if the net
asset value of the investor's Shares in that account falls below $500 and is not
increased to at least such amount within such 30-day period.  See "How to Redeem
Shares--Involuntary Redemption."

CERTAIN FACTORS TO CONSIDER

     An investment in the Portfolio is subject to certain risks, as set forth in
detail under  "Investment  Objective and  Policies." As with other mutual funds,
there can be no assurance  that the Portfolio  will achieve its  objective.  The
Portfolio,  to the extent set forth under  "Investment  Objective and Policies,"
engages in the following investment practices:  the use of repurchase agreements
and reverse repurchase agreements, the purchase of mortgage-related  securities,
the purchase of securities on a "when-issued" or "forward commitment" basis, the
purchase  of  stand-by  commitments,  the lending of  portfolio  securities  and
engaging  in  options  and  futures  transactions.  All  of  these  transactions
involving  certain special risks, as set forth under  "Investment  Objective and
Policies." Investment methods

                                       3
<PAGE>

described in this  Prospectus  are among those which the Portfolio has the power
to utilize.  Some may be employed on a regular basis;  others may not be used at
all.  Accordingly,  reference to any particular  method or technique  carries no
implication that it will be utilized or, if it is, that it will be successful.

SHAREHOLDER INQUIRIES

     Any questions or communications  regarding a shareholder  account should be
directed  to  PFPC,  Bellevue  Park  Corporate  Center,  400  Bellevue  Parkway,
Wilmington, Delaware 19809, toll-free (800) 430-9618.

FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------

     The table below sets forth certain  information  concerning  the investment
results of the RBB Class of the Government  Securities Portfolio for the periods
indicated.  The  financial  data  included in this table for each of the periods
ended August 31, 1994 through  August 31, 1998 are part of the Fund's  financial
statements  for the  Portfolio,  which are  incorporated  by reference  into the
Statement    of    Additional    Information    and   have   been   audited   by
PricewaterhouseCoopers  LLP  ("PricewaterhouseCoopers"),  the Fund's independent
accountants.  The financial data for the Portfolio for the periods ending August
31, 1991, 1992 and 1993 are a part of previous  financial  statements audited by
PricewaterhouseCoopers.   Further  information  about  the  performance  of  the
Portfolio is available in the Annual Report to Shareholders.  The financial data
should be read in conjunction  with the financial  statements and notes thereto.
Both  the  Statement  of  Additional   Information  and  the  Annual  Report  to
Shareholders  may be obtained free of charge by calling the telephone  number on
Page 1 of this Prospectus.

                                       4
<PAGE>

                                  THE RBB CLASS
                         GOVERNMENT SECURITIES PORTFOLIO

FINANCIAL HIGHLIGHTS(e)
     (FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

<TABLE>
<CAPTION>
                                                                                                                       
                                                                                                                       
                                            FOR THE      FOR THE     FOR THE      FOR THE      FOR THE      FOR THE    
                                          YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED  
                                          AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,  
                                             1998         1997         1996         1995         1994         1993     
                                          ----------   ----------   ----------   ----------   ----------   ----------  
<S>                                         <C>          <C>          <C>          <C>          <C>          <C>       
Net asset value, beginning of period ....  $  8.87      $  9.04      $  9.54      $  9.69       $ 10.73      $ 10.46   
                                           -------      -------      -------      -------       -------      -------   
Income from investment operations:
  Net investment income .................   0.5562       0.8744       0.5220       0.5819        0.5931       0.7080   
  Net gains (losses) on securities
    (both realized and unrealized) ......   0.3565       0.1346      (0.2540)      0.0361       (0.8651)      0.3300   
                                           -------      -------      -------      -------       -------      -------   
    Total from investment operations ....   0.9127       1.0090       0.2680       0.6180       (0.2720)      1.0380   
                                           -------      -------      -------      -------       -------      -------   
Less distributions
  Dividends (from net investment income) . (0.5562)     (0.8744)     (0.5220)     (0.5819)      (0.5901)     (0.7080)  
  Distributions (from excess of net
    investment income) ...................      --           --           --           --       (0.0235)          --   
  Return of capital ...................... (0.3565)     (0.3046)     (0.2460)     (0.1861)      (0.1544)     (0.0600)  
                                           -------      -------      -------      -------       -------      -------   
    Total distributions .................. (0.9127)     (1.1790)     (0.7680)     (0.7680)      (0.7680)     (0.7680)  
                                           -------      -------      -------      -------       -------      -------   
Net asset value, end of period ........... $  8.87      $  8.87      $  9.04      $  9.54       $  9.69      $ 10.73   
                                           =======      =======      =======      =======       =======      =======   

Total return ............................. 6.48%(d)     9.39%(d)     2.75%(d)     6.72%(d)    (2.60%)(d)    10.36%(d)  
Ratios/Supplemental Data
  Net assets, end of period (000) ........ $ 5,901      $ 6,737      $ 8,785      $10,514       $54,938      $36,296   
  Ratios of expenses to average
    net assets ........................... 0.70%(a)     0.70%(a)      .70%(a)      .72%(a)       .64%(a)      .66%(a)  
  Ratios of net investment income to
    average net assets ...................   6.16%        6.18%        6.05%        6.59%         5.86%        6.70%   
  Portfolio turnover rate ................      5%          26%          77%          86%           65%          47%   
</TABLE>

<TABLE>
<CAPTION>
                                                            FOR THE PERIOD
                                                            AUGUST 1, 1991
                                              FOR THE       (COMMENCEMENT
                                             YEAR ENDED    OF OPERATIONS) TO
                                             AUGUST 31,       AUGUST 31,
                                                1992             1991
                                             ----------   ----------------- 
<S>                                            <C>             <C>
Net asset value, beginning of period ....      $ 10.12         $ 10.00
                                               -------         -------
Income from investment operations:
  Net investment income .................       0.8002          0.0737
  Net gains (losses) on securities
    (both realized and unrealized) ......       0.3408          0.1213
                                               -------         -------
    Total from investment operations ....       1.1410          0.1950
                                               -------         -------
Less distributions
  Dividends (from net investment income) .     (0.8010)        (0.0750)
  Distributions (from excess of net
    investment income) ...................          --              --
  Return of capital ......................          --              --
                                               -------         -------
    Total distributions ..................     (0.8010)        (0.0750)
                                               -------         -------
Net asset value, end of period ...........     $ 10.46         $ 10.12
                                               =======         =======

Total return .............................    11.73%(d)        1.95%(c)(d)
Ratios/Supplemental Data
  Net assets, end of period (000) ........     $25,604         $28,225
  Ratios of expenses to average
    net assets ...........................      .83%(a)        1.10%(a)(b)
  Ratios of net investment income to
    average net assets ...................       7.81%         8.50%(b)
  Portfolio turnover rate ................         21%            3%(c)
<FN>
(a)  Without the waiver of advisory, administration and custody fees and without
     the reimbursement of certain operating expenses,  the ratios of expenses to
     average net assets for the Government  Securities Portfolio would have been
     1.71%,  2.15%,  2.05%,  1.22%,  1.10%,  1.22% and 1.22% for the years ended
     August 31, 1998, 1997, 1996, 1995, 1994, 1993 and 1992,  respectively,  and
     1.28% annualized for the period ended August 31, 1991.

(b)  Annualized.

(c)  Not annualized.

(d)  Sales load not reflected in total return.

(e)  Financial  Highlights  relate  solely to the RBB Class of Shares within the
     portfolio.
</FN>
</TABLE>

                                       5
<PAGE>

INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------

                         GOVERNMENT SECURITIES PORTFOLIO

     The  objective  of the  Government  Securities  Portfolio is to provide the
highest  level of current  income  consistent  with  liquidity and a low risk to
principal from a portfolio of U.S. Government  obligations.  It seeks to achieve
such  objective by investing in  obligations  issued or  guaranteed  by the U.S.
Treasury or other agencies or instrumentalities of the U.S. Government. There is
no assurance that the investment objective of the Portfolio will be achieved.

     U.S.  GOVERNMENT  OBLIGATIONS.  The Portfolio may purchase U.S.  Government
agency and instrumentality obligations, which are debt securities issued by U.S.
Government-sponsored  enterprises  and federal  agencies.  Some  obligations  of
agencies and  instrumentalities of the U.S. Government are supported by the full
faith and credit of the U.S. Government or by U.S. Treasury guarantees,  such as
securities  of the  Government  National  Mortgage  Association  and the Federal
Housing  Authority;  others,  by the right of the issuer to borrow from the U.S.
Treasury,  such as securities of the Federal Home Loan Mortgage  Corporation and
others,  only  by the  credit  of the  agency  or  instrumentality  issuing  the
obligation,  such as securities of the Federal National Mortgage Association and
the Federal Loan Banks. No assurance can be given that the U.S.  Government will
provide   financial   support   to   U.S.   Government-sponsored   agencies   or
instrumentalities if it is not obligated to do so by law.

     During  ordinary  market  conditions,  at least 90% of the  Portfolio's net
assets will be invested in obligations issued or guaranteed by the U.S. Treasury
or the agencies or instrumentalities  of the U.S. Government,  including options
and futures on such obligations.  The maturities of U.S.  Government  securities
usually range from three months to thirty years. The Portfolio will at all times
invest at least 65% of its assets in such obligations, not including options and
futures on such obligations.  The Portfolio's  investment adviser may adjust the
average  maturity of the Portfolio from time to time depending on its assessment
of relative yields of securities of different maturities and its expectations of
future changes in interest rates. Thus, at certain times the average maturity of
the  Portfolio  may be  relatively  short  (under  one year to five  years,  for
example)  and at other  times may be  relatively  long (more than 10 years,  for
example). The obligations in which the Portfolio invests may not yield as high a
level of current income as lower grade obligations.

     HEDGING  INVESTMENTS.  At such times as the Portfolio's  investment adviser
deems it  appropriate  and  consistent  with  the  investment  objective  of the
Portfolio,  the  Portfolio  may write  covered call  options on U.S.  Government
obligations which are traded on a national  securities  exchange.  The Portfolio
may also  purchase  and sell (i) options on U.S.  Government  obligations,  (ii)
interest  rate futures  contracts,  and (iii)  options on interest  rate futures
contracts.  The purpose of such  transactions is to hedge against changes in the
market value of  securities  in the  Portfolio  caused by  fluctuating  interest
rates,  and to close  out or  offset  its  existing  positions  in such  futures
contracts or options as described  below.  Such instruments will not be used for
speculation. Options and futures contracts are discussed below.

     OPTIONS.  The Portfolio may purchase options issued by the Options Clearing
Corporation  on U.S.  Treasury  bonds,  notes and bills.  Such  options give the
Portfolio  the  right  for a fixed  period  of time to sell  (in the case of the
purchase  of a put  option)  or to buy (in the  case of the  purchase  of a call
option) the number of units of the underlying  obligation  covered by the option
at a fixed or determinable  exercise price. Buying a put hedges against the risk
of rising interest rates. Buying a call hedges against a market advance when the
Portfolio is not fully invested.  Prior to its expiration,  a put or call option
may be sold in a  closing  sale  transaction.  Gain or loss  from the sale  will
depend on whether the amount  received is more or less than the premium paid for
the option plus the related transaction costs.

     The  Portfolio  also may write  (sell) put or call options but only if such
options are covered, and such options remain covered so long as the Portfolio is
obligated as a writer of the option (seller).  A call option is "covered" if the
Portfolio  owns the  underlying  security  covered by the call.  A put option is
"covered" if the Portfolio  maintains in a segregated account with its custodian
liquid assets with a value equal to the exercise  price.  If a "covered" call or
put option expires unexercised,  the writer realizes a gain in the amount of the
premium received. If the covered call is exercised, the writer

                                       6
<PAGE>

realizes a gain or loss from the sale or  purchase  of the  underlying  security
with the proceeds to the writer being increased by the amount of the premium. If
the covered put is exercised,  the writer's cost of  purchasing  the  underlying
security is reduced by the amount of the premium. Prior to its expiration, a put
or call option may be purchased in a closing sale  transaction  and gain or loss
from the sale will  depend on whether  the amount  paid is more or less than the
premium received for the option plus the related transaction costs.

     Options  are  subject to certain  risks,  including  the risk of  imperfect
correlation  between the option and the  Portfolio's  other  investments and the
risk that  there  might not be a liquid  secondary  market  for the  option.  In
general,  options whose strike prices are close to their underlying instruments'
current value will have the highest trading  volume,  while options whose strike
prices are further away may be less liquid. The liquidity of options may also be
affected if options  exchanges impose trading halts,  particularly  when markets
are volatile.

     FUTURES  CONTRACTS.  As noted above,  the Portfolio may invest in financial
futures contracts.  Financial futures contracts obligate the seller to deliver a
specific  type of security  called for in the  contract,  at a specified  future
time, and for a specified price. Financial futures contracts may be satisfied by
actual  delivery of the  securities  or,  more  typically,  by entering  into an
offsetting  transaction.  There are risks  that are  associated  with the use of
futures contracts for hedging purposes.  In certain market  conditions,  as in a
rising interest rate environment,  sales of futures contracts may not completely
offset a decline in value of the portfolio  securities against which the futures
contracts are being sold. In the futures  market,  it may not always be possible
to execute a buy or sell  order at the  desired  price,  or to close out an open
position due to market conditions,  limits on open positions, and/or daily price
fluctuations.  Risks  in the use of  futures  contracts  also  result  from  the
possibility  that changes in the market interest rates may differ  substantially
from the changes  anticipated by the Portfolio's  investment  adviser when hedge
positions were established.

     OPTIONS ON  FUTURES.  The  Portfolio  may  purchase  and write call and put
options on futures  contracts  which are traded on a U.S.  exchange  or board of
exchange  and enter into  closing  transactions  with respect to such options to
terminate  an  existing  position.  An option on a  futures  contract  gives the
purchaser  the right,  in return for the premium paid, to assume a position in a
futures  contract.  The  Portfolio  may use  options  on  futures  contracts  in
connection  with  hedging  strategies.  The  purchase  of put options on futures
contracts is a means of hedging against the risk of rising  interest rates.  The
purchase of call options on futures  contracts  is a means of hedging  against a
market advance when the Portfolio is not fully invested.

     There is no  assurance  that the  Portfolio  will be able to close  out its
financial  futures  positions at any time, in which case it would be required to
maintain the margin  deposits on the  contract.  There can be no assurance  that
hedging transactions will be successful,  as there may be imperfect correlations
(or no correlations)  between  movements in the prices of the futures  contracts
and of the debt  securities  being hedged,  or price  distortions  due to market
conditions in the futures  markets.  Such imperfect  correlations  could have an
impact on the Portfolio's ability to effectively hedge its securities.

     The Portfolio  will not enter into financial  futures  contracts or related
options contracts (valued at market value) if, immediately thereafter, more than
50% of the value of the  Portfolio's  total assets  would be so hedged.  The 50%
investment  restriction is not a fundamental  policy of the Portfolio and may be
changed  without  a  shareholder  vote by the Board of  Directors.  Restrictions
imposed by the Internal  Revenue Code may also limit the Portfolio's  ability to
engage in hedging transactions.

     The  Portfolio  intends to comply  with the  regulations  of the  Commodity
Futures  Trading  Commission  exempting the  Portfolio  from  registration  as a
"commodity pool operator."

                                       7
<PAGE>

     SHORT  SALES.  The  Portfolio  may only  make  short  sales  of  securities
"against-the-box."  A short sale is a transaction  in which a Portfolio  sells a
security it does not own in anticipation  that the market price of that security
will decline.  The Portfolio may make short sales as a form of hedging to offset
potential  declines in long  positions  in similar  securities.  In a short sale
"against-the-box,"  at the time of sale, the Portfolio owns or has the immediate
and unconditional right to acquire the identical security at no additional cost.
When selling short  "against-the-box,"  a portfolio  forgoes an opportunity  for
capital appreciation in the security.

     WHEN-ISSUED SECURITIES.  The Portfolio may purchase portfolio securities on
a  "when-issued"  basis.  When-issued  securities are  securities  purchased for
delivery  beyond the normal  settlement  date at a stated  price and yield.  The
Portfolio will generally not pay for such  securities or start earning  interest
on them until they are received. Securities purchased on a when-issued basis are
recorded  as an asset when the  commitment  is entered  into and are  subject to
changes in value prior to delivery  based upon  changes in the general  level of
interest rates. The Portfolio  expects that commitments to purchase  when-issued
securities  will not exceed 25% of the value of its total assets absent  unusual
market  conditions.  The  Portfolio  does not  intend  to  purchase  when-issued
securities  for  speculative  purposes but only in furtherance of its investment
objective.

     REPURCHASE AGREEMENTS.  The Portfolio may agree to purchase securities from
financial  institutions  subject to the seller's agreement to repurchase them at
an agreed-upon  time and price  ("repurchase  agreements").  The securities held
subject to a  repurchase  agreement  may have  stated  maturities  exceeding  13
months, provided the repurchase agreement itself matures in less than 13 months.
Default by or bankruptcy of the seller would,  however,  expose the Portfolio to
possible loss because of adverse market action or delays in connection  with the
disposition of the underlying obligations.

     LENDING OF PORTFOLIO SECURITIES.  The Portfolio may also lend its portfolio
securities  to  financial   institutions   in  accordance  with  the  investment
restrictions  described  below.  Such  loans  would  involve  risks  of delay in
receiving  additional  collateral  in the  event  the  value  of the  collateral
decreased below the value of the securities loaned or of delay in recovering the
securities  loaned or even loss of rights in the collateral  should the borrower
of the  securities  fail  financially.  However,  loans  will  be  made  only to
borrowers  deemed by the Portfolio's  investment  adviser to be of good standing
and only when, in the adviser's judgment, the income to be earned from the loans
justifies the attendant risks.

     PORTFOLIO TURNOVER. The Portfolio will actively use trading to benefit from
yield  disparities  among  different  issues of U.S.  Government  securities  or
otherwise to achieve its  investment  objective  and  policies.  The  Portfolio,
therefore,  may be subject to a greater  degree of turnover and,  thus, a higher
incidence of short-term  capital gains taxable as ordinary  income than might be
expected  from  portfolios  which invest  substantially  all of their funds on a
long-term basis, and  correspondingly  larger mark-up charges can be expected to
be borne by the Portfolio. The Portfolio anticipates that the annual turnover in
the  Portfolio  will not be in excess of 200%. A 200%  turnover  rate is greater
than that of many other investment companies.

     ILLIQUID SECURITIES. The Portfolio will not invest more than 15% of its net
assets in illiquid  securities,  including  repurchase  agreements  which have a
maturity of longer  than seven days and other  securities  that are  illiquid by
virtue of the  absence  of a readily  available  market or legal or  contractual
restrictions on resale.  Repurchase  agreements  subject to demand are deemed to
have a  maturity  equal to the  notice  period.  Securities  that have  legal or
contractual  restrictions on resale but have a readily  available market are not
deemed  illiquid for purposes of this  limitation.  The  Portfolio's  investment
adviser  will  monitor the  liquidity of such  restricted  securities  under the
supervision  of  the  Board  of  Directors.   See   "Investment   Objective  and
Policies--Illiquid Securities" in the Statement of Additional Information.

     The Portfolio's  investment  objective and policies  described above may be
changed by the Fund's Board of  Directors  without the  affirmative  vote of the
holders of a majority of outstanding  Shares of the Fund representing  interests
in the Portfolio.

                                       8
<PAGE>

YEAR 2000
- --------------------------------------------------------------------------------

     Like  other  mutual  funds,   financial  and  business   organizations  and
individuals  around  the  world,  the Fund could be  adversely  affected  if the
computer systems used by the Adviser and the Fund's other service providers,  or
persons with whom they deal, do not properly process and calculate  date-related
information  and data  from and after  January  1,  2000.  This  possibility  is
commonly known as the "Year 2000 Problem." The Year 2000 Problem could also hurt
companies whose securities the Fund holds or securities markets  generally.  The
Fund has been advised by the Adviser,  the Administrators and the Custodian that
they are actively  taking steps to address the Year 2000 Problem with respect to
the computer  systems  that they use and to obtain  assurances  that  comparable
steps are being taken by the Fund's other major service  providers.  While there
can be no  assurance  that  the  Fund's  service  providers  will be  Year  2000
compliant,  the Fund's service providers expect that their plans to be compliant
will be achieved.

INVESTMENT LIMITATIONS
- --------------------------------------------------------------------------------

     The  Portfolio may not change the following  investment  limitations  (with
certain exceptions,  as noted below) without shareholder  approval.  (A complete
list of the investment limitations that cannot be changed without such a vote of
the shareholders is contained in the Statement of Additional  Information  under
"Investment Objective and Policies.")

     The Portfolio may not:

         1.  Purchase the  securities of any one issuer,  other than  securities
     issued  or   guaranteed   by  the  U.S.   Government  or  its  agencies  or
     instrumentalities,  if  immediately  after and as a result of such purchase
     more than 5% of the value of the Portfolio's total assets would be invested
     in the  securities  of such  issuer,  or more  than 10% of the  outstanding
     voting  securities of such issuer would be owned by the  Portfolio,  except
     that up to 25% of the value of the Portfolio's total assets may be invested
     without regard to such limitations.

         2. Borrow money,  except from banks for temporary  purposes and then in
     amounts not in excess of 10% of the value of the  Portfolio's  total assets
     at the time of such  borrowing,  and only if after such borrowing  there is
     asset  coverage of at least 300% for all  borrowings of the  Portfolio,  or
     mortgage, pledge or hypothecate any of its assets except in connection with
     any such  borrowing and in amounts not in excess of 10% of the value of the
     Portfolio's  total  assets  at the  time of  such  borrowing;  or  purchase
     portfolio   securities  while  borrowings  are  in  excess  of  5%  of  the
     Portfolio's  net assets.  (This  borrowing  provision is not for investment
     leverage, but solely to facilitate management of the Portfolio's securities
     by enabling the Portfolio to meet redemption requests where the liquidation
     of portfolio securities is deemed to be disadvantageous or inconvenient.)

         3. Purchase any securities  which would cause, at the time of purchase,
     25% or more  of the  value  of the  total  assets  of the  Portfolio  to be
     invested in the obligations of issuers in any industry, provided that there
     is  no  limitation   with  respect  to  investments   in  U.S.   Government
     obligations.  (In determining  whether the Portfolio has complied with this
     limitation,  the  value of  options  and  futures  will  not be taken  into
     account.)

         4. Make loans  except  that the  Portfolio  may  purchase  or hold debt
     obligations  in  accordance  with its  investment  objective,  policies and
     limitations,  may enter into repurchase agreements for securities,  and may
     lend  portfolio  securities  against  collateral   consisting  of  cash  or
     securities which are consistent with the Portfolio's permitted investments,
     which is equal at all times to at least 100% of the value of the securities
     loaned. There is no investment restriction on the amount of securities that
     may be loaned,  except that  payments  received  on such  loans,  including
     amounts  received  during the loan on account of interest on the securities
     loaned, may not (together with all non-qualifying income) exceed 10% of the
     Portfolio's annual gross income (without offset for realized capital gains)
     unless,  in the opinion of counsel to the Fund, such amounts are qualifying
     income  under  federal  income  tax  provisions   applicable  to  regulated
     investment companies.

                                       9
<PAGE>

MANAGEMENT
- --------------------------------------------------------------------------------

BOARD OF DIRECTORS

     The business and affairs of the Fund and the  Portfolio  are managed  under
the direction of the Fund's Board of Directors.  The Fund currently  operates or
proposes to operate seventeen  separate  investment  portfolios.  The RBB Family
Class represents interests in the Government Securities Portfolio.

INVESTMENT ADVISER

     BIMC,  an indirect  majority-owned  subsidiary  of PNC Bank,  serves as the
investment adviser for the Portfolio. BIMC has its principal offices at Bellevue
Park Corporate  Center,  400 Bellevue Parkway,  Wilmington,  Delaware 19809. PNC
Bank and its  subsidiaries  currently  manage over $45.9  billion of assets,  of
which  approximately  $31.4 billion are mutual funds.  PNC Bank, a national bank
whose  principal   business   address  is  1600  Market  Street,   Philadelphia,
Pennsylvania  19103,  is a  wholly-owned  subsidiary  of PNC  Bancorp,  Inc. PNC
Bancorp,  Inc. is a bank holding  company and a  wholly-owned  subsidiary of PNC
Bank Corp., a multi-bank holding company.

     As adviser to the Portfolio,  BIMC is responsible for overall management of
the  Portfolio,  and is  responsible  for all  purchases  and sales of portfolio
securities for the Portfolio.

     Robert J. Morgan is responsible for the day-to-day  portfolio management of
the Portfolio.  Mr. Morgan is Assistant  Vice President with BIMC,  where he has
been employed since 1988. Previously, he was a Portfolio Manager with CoreStates
Financial Corp.

     For the services  provided and expenses  assumed by it, BIMC is entitled to
receive the  following  fees,  computed  daily and payable  monthly based on the
Portfolio's  average daily net assets: .40% of first $250 million of net assets;
 .35% of next $250  million  of net  assets;  and .30% of net assets in excess of
$500  million.  BIMC  may in its  discretion  from  time to time  agree to waive
voluntarily  all or any  portion  of its  advisory  fee  for the  Portfolio.  In
addition,  BIMC may from time to time  enter into an  agreement  with one of its
affiliates  pursuant to which it  delegates  some or all of its  accounting  and
administrative  obligations under its advisory agreements with the Fund relating
to the Portfolio. Any such arrangement would have no effect on the advisory fees
payable by the Portfolio to BIMC.

     For the fiscal  year ended  August 31,  1998,  BIMC  waived all  investment
advisory fees payable to it with respect to the Portfolio.

ADMINISTRATOR

     PFPC  serves  as  administrator  to the  Portfolio.  PFPC  is an  indirect,
wholly-owned  subsidiary of PNC Bank Corp. PFPC generally  assists the Portfolio
in all aspects of its administration and operations,  including matters relating
to the maintenance of financial  records and accounting.  PFPC is entitled to an
administration fee, computed daily and payable monthly at an annual rate of .10%
of the  Portfolio's  average daily net assets.  For the fiscal year ended August
31, 1998, PFPC waived all administration  fees payable to it with respect to the
portfolio.   PFPC's  principal   business  address  is  400  Bellevue   Parkway,
Wilmington, Delaware 19809.

TRANSFER AGENT, DIVIDEND DISBURSING AGENT, AND CUSTODIAN

     PFPC Trust Company, an indirect wholly-owned  subsidiary of PNC Bank Corp.,
will succeed PNC Bank, National Association ("PNC Bank") as the Fund's custodian
pursuant to an assignment. PNC Bank will continue to provide certain services to
PFPC Trust  Company.  PFPC  serves as the  Fund's  transfer  agent and  dividend
disbursing  agent.  The  principal  offices of PFPC are located at 400  Bellevue
Parkway,  Wilmington,  Delaware 19809. PFPC may enter into shareholder servicing
agreements  with  registered   broker/dealers   who  have  entered  into  dealer
agreements with the Distributor

                                       10
<PAGE>

                      (THIS PAGE INTENTIONALLY LEFT BLANK.)

<PAGE>


                      THE RBB CLASS NEW ACCOUNT APPLICATION
 Mail completed application to: PFPC - Attention: The RBB Class, P.O. Box 8950,
                              Wilmington, DE 19899


<TABLE>

========================================================================================================
<S>                <C>                                                             <C> 
1                  ---------------------------------------------------------     [ ] Individual
                   PLEASE PRINT
Registration
                   ---------------------------------------------------------     [ ] Joint Tenant
                   Owner

                                                                                 [ ] Custodian
                   ---------------------------------------------------------
                   Co-owner*, minor, trust
                                                                                 [ ] UGMA_____(state)

                   ---------------------------------------------------------
                   Street Address                                                [ ] Trust


                   ---------------------------------------------------------     [ ] Corporation
                   City                  State             Zip Code

                                                                                 [ ] Other____________
                   ---------------------------------------------------------
                   *For joint registration, both must sign. The registration
                   will be as joint tenants with the right of survivorship
                   and not as tenants in common, unless otherwise stated.

- --------------------------------------------------------------------------------------------------------

2                  Enclosed is my check for $_________ (minimum of $1,000 per portfolio) made payable to
Investments        "The RBB Class" GOVERNMENT SECURITIES PORTFOLIO $_________________.
                   My account being established with this application qualifies for a reduced sales 
                   charge with one of the following privileges:


                    [ ] RIGHT OF ACCUMULATION - I agree for Right of Accumulation reduced sales charges
                        based on the following accounts in the RBB Class

                   ------------------------------         --------------------------------
                             Portfolio                              Account No.

                    [ ] LETTER OF INTENT - I agree to the Letter of Intent provisions in the prospectus.
                        I plan to invest during a 13-month period a dollar amount of at least $________.
                        ($100,000 minimum)

========================================================================================================
</TABLE>


<PAGE>


<TABLE>
========================================================================================================
<S>                <C>                                                                                                   
3                  Under penalties of perjury, I certify with my signature below that the number shown
Taxpayer           in this section of the application is my correct taxpayer identification number and 
Identification     that I am not subject to backup withholdings as a result of a failure to report all
                   interest or dividends, or the Internal Revenue Service has notified me that I am no
                   longer subject to backup withholding.

                   If you are subject to backup withholding, check the box in front of the following
                   statement.

               [ ] The Internal Revenue Service has notified me that I am subject to backup withholding.

                   

                   ------------------------------   or   --------------------------------  or
                     (Owner's Social Security #)               (Tax Identification #)



                   ------------------------------
                     (Minor's Social Security #)

- --------------------------------------------------------------------------------------------------------

4                  A. DIVIDEND ELECTION
Options            Unless you elect otherwise, all dividends and capital gains distributions will be
                   automatically reinvested in additional shares. If you prefer to be paid in cash each
                   month check the appropriate box below. Pay all:
                   
                      [ ] dividends and capital gains in cash.

                      [ ] dividends in cash and reinvest capital gains.

                      [ ] capital gains in cash and reinvest dividends.

                      [ ] I request the above distributions be sent to the special payee whose address is
                          specified in Section B below.

- --------------------------------------------------------------------------------------------------------

B. SYSTEMATIC WITHDRAWAL

Systematic withdrawal plan minimum account of $10,000 in shares at the current offering price. Minimum
withdrawal $100. Each withdrawal redemption will be processed about the 25th of the month and mailed
as soon as possible thereafter. SHAREHOLDERS HOLDING SHARE CERTIFICATES ARE NOT ELIGIBLE FOR THE
SYSTEMATIC WITHDRAWAL PLAN BECAUSE SHARE CERTIFICATES MUST ACCOMPANY ALL WITHDRAWAL REQUESTS.

Start (month) __________________________________  $(amount)____________________________

 [ ]  Monthly          [ ] Quarterly             [ ] Semi-annually            [ ] Annually
</TABLE>

<PAGE>

<TABLE>

<S>                <C>                  
Provide the following information only if distribution or withdrawal checks are to be payable to a 
person or organization different than as registered.

   Name of Bank or Individual: ________________________________________________________
   Bank Account # (if applicable)______________________________________________________
   Street_______________________________City_________________State________Zip__________


C. AUTOMATIC INVESTING

This program provides for investments to be made automatically, by authorizing PFPC to withdraw funds
from your bank account. An initial minimum investment of $1,000, and subsequent investment of at least
$100 are required. The program requires additional information so that PFPC may contact your bank to
make sure the arrangement is properly established. This may not be used with a Systematic Withdrawal 
Program.

   [ ] Check here and the proper form will be sent to you.

========================================================================================================
5                  Citizenship:    [ ] U.S.   [ ] Other________________________
Signatures         Please provide Phone Number (___)________________
                   Sign below exactly as printed in Registration.
                   I(we) am (are) of legal age and have read the prospectus. I(we) hereby certify that
                   each of the persons listed below has been duly elected, and is now legally holding
                   the office set below his name and has the authority to make this authorization.
                   Please print titles below if signing on behalf of a business or trust.

                   NOTE: YOU MUST CROSS OUT ITEM (2) ABOVE IF YOU HAVE BEEN NOTIFIED BY THE IRS THAT YOU
                   ARE CURRENTLY SUBJECT TO BACKUP WITHHOLDING BECAUSE YOU HAVE FAILED TO REPORT ALL
                   INTEREST AND DIVIDENDS ON YOUR TAX RETURN. THE INTERNAL REVENUE SERVICE DOES NOT
                   REQUIRE YOUR CONSENT TO ANY PROVISIONS OF THIS DOCUMENT OTHER THAN THE CERTIFICATION
                   REQUIRED TO AUDIT BACKUP WITHHOLDING.

                   -------------------------------------------------------------
                                            Signature

                   -------------------------------------------------------------
                   (President, Trustee, General Partner or Agent)

                   -------------------------------------------------------------
                                            Signature

                   -------------------------------------------------------------
                   (Co-owner, Secretary of Corporation, Co-trustee, etc.)

- --------------------------------------------------------------------------------------------------------

6                  MUST BE COMPLETED BY DEALER
Investment Dealer  
                   -------------------------------------------------------------
                   Firm Name

                   -------------------------------------------------------------
                   Branch Street Address

                   -------------------------------------------------------------
                   Representative's Signature

                   -------------------------------------------------------------
                   Representative's name (print)

                   -------------------------------------------------------------
                   Representative Number

                   -------------------------------------------------------------
                   Date

========================================================================================================
</TABLE>
<PAGE>

                      (THIS PAGE INTENTIONALLY LEFT BLANK.)

<PAGE>

("Authorized Dealers") for the provision of certain shareholder support services
to customers of such Authorized  Dealers who are  shareholders of the Portfolio.
The services  provided  and the fees payable by the Fund for these  services are
described in the Statement of Additional Information under "Investment Advisory,
Distribution and Servicing Arrangements."

DISTRIBUTOR

     Provident  Distributors,  Inc., with a principal  business  address at Four
Falls Corporate Center, West Conshohocken, Pennsylvania, acts as Distributor for
the  Portfolio  pursuant  to a  distribution  agreement  dated May 29, 1998 (the
"Distribution Agreement").

EXPENSES

     The expenses of the  Portfolio  are deducted  from its total income  before
dividends  are paid.  Any  general  expenses  of the Fund  that are not  readily
identifiable as belonging to a particular  investment portfolio of the Fund will
be allocated among all investment portfolios of the Fund based upon the relative
net assets of the investment portfolios.  The RBB Class of the Fund pays its own
distribution  fees, and may pay a different share than other classes of the Fund
of other expenses  (excluding advisory and custodial fees) if those expenses are
actually  incurred  in a  different  amount by the RBB  Class or if it  receives
different services.

     The investment adviser may assume additional expenses of the Portfolio from
time to time.  In certain  circumstances,  it may assume  such  expenses  on the
condition  that it is  reimbursed by the Portfolio for such amounts prior to the
end of a fiscal year. In such event, the reimbursement of such amounts will have
the effect of increasing the Portfolio's  expense ratio and of decreasing  yield
to investors.

     For the Fund's fiscal year ended August 31, 1998, the Fund's total expenses
were 1.71% of the  average  daily net  assets of the RBB Class of the  Portfolio
(not taking into account waivers and reimbursements of 1.01%).

PORTFOLIO TRANSACTIONS

     The  Portfolio's  adviser may  consider a number of factors in  determining
which brokers to use in purchasing or selling the Portfolio's securities.  These
factors,  which  are  more  fully  discussed  in  the  Statement  of  Additional
Information,   include,   but  are  not  limited  to,  research  services,   the
reasonableness   of   commissions   and  quality  of  services  and   execution.
Transactions  for the  Portfolio  may be effected  through  Authorized  Dealers,
subject to the  requirements  of best  execution.  The  Portfolio may enter into
brokerage  transactions  with and pay brokerage  commissions to brokers that are
affiliated  persons (as such term is defined in the 1940 Act)  provided that the
terms of the brokerage transactions comply with the provisions of the 1940 Act.

DISTRIBUTION OF SHARES
- --------------------------------------------------------------------------------

     The Board of  Directors of the Fund  approved and adopted the  Distribution
Agreement and a Plan of Distribution  for the Portfolio (the "Plan") pursuant to
Rule 12b-1 under the 1940 Act.  Under the Plan,  the  Distributor is entitled to
receive  from the Class a  distribution  fee,  which is  accrued  daily and paid
monthly, of up to .65% on an annualized basis of the average daily net assets of
the Class. The actual amount of such compensation  under the Plan is agreed upon
by the Fund's Board of Directors and by the Distributor.  Under the Distribution
Agreement,  the Distributor has agreed to accept  compensation  for its services
thereunder  and under the Plan in the  amount of .40% of the  average  daily net
assets of the Class on an annualized basis in any year. Such compensation may be
increased,  up to the amount  permitted  in the Plan,  with the  approval of the
Fund's Board of  Directors.  Pursuant to the  conditions  of an exemptive  order
granted by the Securities and Exchange  Commission (the "SEC"),  the Distributor
has agreed to waive its fee with respect to the

                                       11
<PAGE>

Class on any day to the extent  necessary  to ensure that the fee required to be
accrued by the Class  does not  exceed  the income of the Class on such day.  In
addition,  the  Distributor  may,  in its  discretion,  from time to time  waive
voluntarily all or any portion of its distribution fee.

     Under the dealer  agreements  in effect  with  respect  to the  Class,  the
Distributor  may  reallocate up to all of the  compensation  it receives for its
services under the  Distribution  Agreement and the Plan to Authorized  Dealers,
based upon the  aggregate  investment  amounts  maintained  by customers of such
Authorized  Dealers  in  the  Portfolio.  The  Distributor  may  also  reimburse
Authorized  Dealers for other expenses  incurred in the promotion of the sale of
Fund  Shares.  The  Distributor  and/or  Authorized  Dealers pay for the cost of
printing   (excluding   typesetting)   and  mailing  to  prospective   investors
prospectuses  and  other  materials  relating  to the  Portfolio  as well as for
related direct mail, advertising and promotional expenses.

     The Plan obligates the Fund,  during the period it is in effect,  to accrue
and pay to the  Distributor  on behalf  of the Fund the fee  agreed to under the
Distribution Plan.  Payments under the Plan are not tied exclusively to expenses
actually incurred by the Distributor,  and the payments may exceed  distribution
expenses actually incurred.

HOW TO PURCHASE SHARES
- --------------------------------------------------------------------------------

GENERAL

     Shares representing interests in the Portfolio are offered continuously for
sale by the Distributor and may be purchased through Authorized Dealers.  Shares
representing interests in the Portfolio may be purchased initially by completing
the  application  included in this  Prospectus and  forwarding the  application,
through the designated  Authorized  Dealer, to the Fund's transfer agent,  PFPC.
Subsequent  purchases of Shares may be effected through an Authorized  Dealer or
by mailing a check or Federal  Reserve  Draft,  payable to the order of "The RBB
Class" to The RBB Class,  c/o PFPC, P.O. Box 8916,  Wilmington,  Delaware 19899.
The name of the Portfolio for which Shares are being  purchased must also appear
on the check or Federal  Reserve Draft.  Federal Reserve Drafts are available at
national  banks or any  state  bank  which is a member  of the  Federal  Reserve
System.  Initial  investments  in the  Portfolio  must be at  least  $1,000  and
subsequent  investments  must be at least $100.  The Fund  reserves the right to
reject any purchase order.

     Shares may be purchased on any  Business  Day. A "Business  Day" is any day
that the New York Stock  Exchange (the "NYSE") is open for business.  Currently,
the NYSE is closed on weekends and New Year's Day, Dr. Martin  Luther King,  Jr.
Day,  Presidents' Day, Good Friday,  Memorial Day,  Independence Day, Labor Day,
Thanksgiving Day and Christmas Day and the preceding Friday or subsequent Monday
when one of these  holidays  falls on Saturday or Sunday.  Shares are offered at
the next  determined  net asset value per share,  plus a sales load as described
below.

     The price paid for Shares  purchased  is based on the net asset  value next
computed (plus a sales charge,  if no sales charge has been  previously  imposed
with respect to such Shares) after a purchase order is received in good order by
the Fund's transfer agent.  Such price will be the net asset value next computed
(plus any  applicable  sales charge) after an order is received by an Authorized
Dealer provided such order is transmitted to and received by the Fund's transfer
agent prior to its close of business  on such day. It is the  responsibility  of
Authorized  Dealers to transmit  orders  received by them to the Fund's transfer
agent so they will be received  prior to such time. On any Business Day,  orders
received by the Fund's transfer agent from an Authorized  Dealer after its close
of  business  are  priced  at the net  asset  value  next  determined  (plus any
applicable sales charge) on the following Business Day. Orders of less than $500
are mailed by an  Authorized  Dealer.  In those cases where an investor pays for
Shares by check,  the purchase will be effected at the net asset value (plus any
applicable  sales  charge)  next  determined  after the  Fund's  transfer  agent
receives  the  order  and  Federal  Funds are  available  to the Fund,  which is
generally two Business Days after a purchase order is received.

                                       12
<PAGE>

     Shareholders  whose  shares  are  held in the  street  name  account  of an
Authorized  Dealer and who desire to  transfer  such  shares to the street  name
account of another  Authorized  Dealer should  contact their current  Authorized
Dealer.

     SALES  CHARGES--GENERAL.  The following table shows sales charges generally
applicable to Shares at various investment levels.  Sales charges are reduced on
a graduated  scale on single  purchases  of Shares of  $100,000  or more.  Sales
charges  are  imposed   regardless  of  whether  Shares  are  purchased  through
Authorized Dealers or by direct investment.  During special promotions,  as much
as the entire  sales load may be reallowed to  Authorized  Dealers,  and at such
times such Authorized  Dealers may, by virtue of such reallowance,  be deemed to
be "underwriters" under the 1933 Act.

<TABLE>
<CAPTION>
                                                          SALES            SALES         REALLOWANCE
                                                        CHARGE AS        CHARGE AS      TO AUTHORIZED
                                                       PERCENTAGE       PERCENTAGE       DEALERS (AS
                                                         OF NET         OF OFFERING     % OF OFFERING
      AMOUNT OF TRANSACTION AT OFFERING PRICE          ASSET VALUE        PRICE            PRICE)
- --------------------------------------------------     -----------      -----------     -------------
<S>                                                       <C>              <C>              <C>  
Less than $100,000 ...............................        4.99%            4.75%            4.25%
$100,000 but less than $250,000 ..................        4.17             4.00             3.50
$250,000 but less than $500,000 ..................        3.09             3.00             2.50
$500,000 but less than $1,000,000 ................        2.04             2.00             1.60
$1,000,000 but less than $2,000,000 ..............        1.01             1.00              .80
$2,000,000 but less than $4,000,000 ..............          50              .50              .40
$4,000,000 and above .............................         -0-              -0-              -0-
</TABLE>

     The foregoing schedule of sales charges applies to purchases of Shares made
at any one time by the following: (a) any individual; (b) any individual, his or
her spouse,  and their  children under the age of 21; (c) a trustee or fiduciary
of a single trust estate or single fiduciary account; or (d) any organized group
which has been in existence  for more than six months,  provided  that it is not
organized  for the  purpose  of buying  redeemable  securities  of a  registered
investment  company,  and  provided  that the purchase is made through a central
administration,  or through a single  dealer,  or by other means which result in
economy of sales effort or expense.  An organized group does not include a group
of individuals whose sole  organizational  connection is participation as credit
card holders of a company,  policyholders of an insurance company,  customers of
either a bank or  broker-dealer or clients of an investment  adviser.  Purchases
made by an  organized  group  may  include,  for  example,  a  trustee  or other
fiduciary  purchasing for a single  fiduciary  account or other employee benefit
plan purchases made through a payroll deduction plan.

     The foregoing  schedule  applies to single  purchases and to purchases made
under a Letter of Intent or pursuant to the Right of Accumulation, both of which
are described below.

     RIGHT OF ACCUMULATION.  Under the Right of Accumulation,  the current value
of an  investor's  existing  Shares  may be  combined  with  the  amount  of the
investor's  current purchase of Shares in determining the sales charge. IN ORDER
TO RECEIVE THE CUMULATIVE QUANTITY REDUCTION,  PREVIOUS PURCHASES OF SHARES MUST
BE CALLED  TO THE  ATTENTION  OF THE  FUND'S  TRANSFER  AGENT AT THE TIME OF THE
CURRENT PURCHASE.

     LETTER OF INTENT.  An investor may qualify for a reduced  sales charge on a
purchase of Shares  immediately by signing a nonbinding Letter of Intent stating
the  investor's  intention  to  invest  in  Shares  during  the next 13 months a
specified  amount which, if made at one time,  would qualify for a reduced sales
charge.  Any redemptions made during the 13-month period will be subtracted from
the amount of  purchases  in  determining  whether the Letter of Intent has been
completed. During the term of a Letter of Intent, the Fund's transfer agent will
hold Shares  representing 5% of the indicated  amount in escrow for payment of a
higher  sales load if the full amount  indicated  in the Letter of Intent is not
purchased.  The escrowed Shares will be released when the full amount  indicated
has been  purchased.  If the full amount  indicated is not purchased  within the
13-month  period,  the  investor  will be required to pay an amount equal to the
dif-

                                       13
<PAGE>

ference in the dollar  amount of sales  charge  actually  paid and the amount of
sales  charge  the  investor  would  have  had to  pay  on his or her  aggregate
purchases if the total of such purchases had been made at a single time.

     The following persons  associated with the Fund, the Distributor,  or BIMC,
PNC Bank or PFPC may buy Shares  without  paying a sales  charge:  (a) officers,
directors  and  partners;   (b)   employees   and   retirees;   (c)   registered
representatives  of Authorized  Dealers and of the  Distributor;  (d) spouses or
children of any such  persons;  and (e) any trust,  pension,  profit-sharing  or
other  benefit  plan for any of the  persons set forth in (a) through (d) above.
The  following  persons  may  also buy  Shares  without  paying a sales  charge,
provided any such person informs the  Portfolio's  transfer agent at the time of
purchase  that it believes it qualifies for a sales charge  waiver:  (a) a trust
department of a bank or law firm; (b) a 501(c)(3)  organization and a charitable
remainder  trust  or a  life  income  pool  established  for  the  benefit  of a
charitable organization; (c) a registered investment adviser for its own account
or on  behalf  of its  clients;  (d) an  employee  benefit  or  retirement  plan
(including 401(k) plans, 403(b) plans, 457 plans, profit-sharing plans, SEP-IRAs
and qualified plans for self-employed  individuals,  but excluding regular IRAs,
IRA transfers,  IRA rollovers and non-working spousal IRAs): and (e) a financial
planner  that  charges  a fee and  makes  the  qualifying  purchases  through  a
financial  institution's net asset value purchase program (provided the purchase
program is  recognized  by the Fund,  and the  Portfolio  whose shares are being
purchased is listed as part of the purchase program).

AUTOMATIC INVESTING

     Additional  investments in Shares may be made  automatically by authorizing
the Fund's  transfer agent to withdraw  funds from your bank account.  Investors
desiring to  participate  in the  automatic  investing  program  should call the
Fund's transfer agent, PFPC, at (800) 430-9618 to obtain the appropriate forms.

RETIREMENT PLANS

     Shares may be purchased in conjunction with individual  retirement accounts
("IRAs")  and  rollover  IRAs  where PNC Bank  acts as  custodian.  For  further
information as to  applications  and annual fees,  contact the Distributor or an
Authorized  Dealer.  To determine  whether the benefits of an IRA are  available
and/or appropriate, a shareholder should consult with a tax adviser.

HOW TO REDEEM SHARES
- --------------------------------------------------------------------------------

NORMAL REDEMPTION

     Shareholders  may  redeem  for  cash  some or all of  their  Shares  of the
Portfolio at any time.  To do so, a written  request in proper form must be sent
directly to The RBB Class, c/o PFPC, P.O. Box 8916, Wilmington,  Delaware 19899.
There is no charge for a  redemption.  Shareholders  may also  place  redemption
requests through an Authorized Dealer, but such Authorized Dealer might charge a
fee for this service.

     A request for  redemption  must be signed by all persons in whose names the
Shares  are   registered.   Signatures  must  conform  exactly  to  the  account
registration.  If the proceeds of the redemption would exceed $10,000, or if the
proceeds are not to be paid to the record owner at the record address, or if the
shareholder is a corporation, partnership, trust or fiduciary, signature(s) must
be  guaranteed.  A signature  guarantee  may be obtained from a domestic bank or
trust company,  broker,  dealer,  clearing agency or savings association who are
participants  in a  medallion  program  recognized  by the  Securities  Transfer
Association.  The three recognized  medallion  programs are Securities  Transfer
Agents Medallion Program (STAMP),  Stock Exchanges  Medallion Program (SEMP) and
New York Stock  Exchange,  Inc.  Medallion  Signature  Program (MSP).  Signature
guarantees that are not part of these programs will not be accepted.

                                       14
<PAGE>

     Generally,  a properly signed written  request with any required  signature
guarantee  is all that is required  for a  redemption.  In some cases,  however,
other  documents  may be  necessary.  For  example,  the Fund will  issue  share
certificates  for  Shares  if a  written  request  has been  made to the  Fund's
transfer  agent.  In the case of shareholders  holding share  certificates,  the
certificates  for the  shares  being  redeemed  must  accompany  the  redemption
request.  Additional  documentary  evidence of authority is also required by the
Fund's  transfer  agent in the event  redemption is requested by a  corporation,
partnership, trust, fiduciary, executor or administrator.

SYSTEMATIC WITHDRAWAL PLAN

     If your  account  has a value  of at least  $10,000,  you may  establish  a
Systematic  Withdrawal  Plan for the  Portfolio  and  receive  regular  periodic
payments. A request to establish a Systematic  Withdrawal Plan must be submitted
in  writing to the Fund's  transfer  agent,  PFPC,  P.O.  Box 8916,  Wilmington,
Delaware  19899.  SHAREHOLDERS  HOLDING SHARE  CERTIFICATES  ARE NOT ELIGIBLE TO
ESTABLISH A SYSTEMATIC WITHDRAWAL PLAN BECAUSE SHARE CERTIFICATES MUST ACCOMPANY
ALL WITHDRAWAL REQUESTS.  Each withdrawal redemption will be processed about the
25th of the  month  and  mailed  as soon as  possible  thereafter.  There are no
service charges for  maintenance;  the minimum amount that you may withdraw each
period is $100.  (This is merely the  minimum  amount  allowed and should not be
mistaken for a recommended  amount.) The holder of a Systematic  Withdrawal Plan
will have any income dividends and any capital gains distributions reinvested in
full and  fractional  shares at net asset value.  To provide  funds for payment,
shares of the  Portfolio  will be redeemed in such amount as is necessary at the
redemption  price,  which is net asset  value next  determined  after the Fund's
receipt of a  redemption  request.  Redemption  of shares may reduce or possibly
exhaust  the  Shares  in your  account,  particularly  in the  event of a market
decline. As with other redemptions, a redemption to make a withdrawal payment is
a sale for federal  income tax purposes.  Payments made pursuant to a Systematic
Withdrawal  Plan cannot be  considered  as actual  yield or income since part of
such payments may be a return of capital.

     The maintenance of a Systematic  Withdrawal  Plan for a Class  concurrently
with  purchases of  additional  Shares would be  disadvantageous  because of the
sales commission involved in the additional  purchases.  You will ordinarily not
be allowed to make  additional  investments  of less than the  aggregate  annual
withdrawals  under the Systematic  Withdrawal  Plan during the time you have the
plan in effect and, while a Systematic Withdrawal Plan is in effect, you may not
make  periodic  investments  under  Automatic  Investing.  You  will  receive  a
confirmation  of each  transaction  showing  the  sources of the payment and the
share and cash balance  remaining in your plan.  The plan may be  terminated  on
written  notice by the  shareholder or by the Fund with respect to the Portfolio
and it will  terminate  automatically  if all Shares are liquidated or withdrawn
from the account or upon the death or  incapacity  of the  shareholder.  You may
change the amount and schedule of  withdrawal  payments or suspend such payments
by giving  written  notice to the Fund's  transfer agent at least seven Business
Days prior to the end of the month preceding a scheduled payment.

INVOLUNTARY REDEMPTION

     The Fund  reserves  the  right to  redeem a  shareholder's  account  in the
Portfolio at any time the net asset value of the account in such Portfolio falls
below $500 as the result of a redemption request.  Shareholders will be notified
in writing that the value of their  account in a Portfolio is less than $500 and
will be allowed 30 days to make additional  investments before the redemption is
processed.

PAYMENT OF REDEMPTION PROCEEDS

     In all cases,  the  redemption  price is the net asset value per share next
determined  after the request for  redemption  is received in proper form by the
Fund's  transfer  agent.  Payment for Shares  redeemed  is made by check  mailed
within seven days after  acceptance by the Fund's  transfer agent of the request
and any other necessary documents in proper order. Such payment may be postponed
or the right of redemption suspended as provided by the rules of the SEC. If

                                       15
<PAGE>

the Shares to be redeemed  have been  recently  purchased  by check,  the Fund's
transfer agent may delay mailing a redemption check, which may be a period of up
to 15 days, pending a determination that the check has cleared.

NET ASSET VALUE
- --------------------------------------------------------------------------------

     The net asset value of each class of the  Portfolio is calculated as of the
close of regular  trading on the NYSE on each  Business Day. The net asset value
for  each  class  of a  portfolio  is  calculated  by  adding  the  value of the
proportionate  interest  of the class in the  portfolio's  securities,  cash and
other  assets,  deducting  the actual and accrued  liabilities  of the class and
dividing the result by the total number of outstanding  shares of the class. The
net asset value of each class is calculated separately from each other class.

     Valuation of  securities  held by the  Portfolio is as follows:  securities
traded on a national securities exchange or on the NASDAQ National Market System
are valued at the last  reported  sale price  that day;  securities  traded on a
national  securities  exchange or on the NASDAQ National Market System for which
there were no sales on that day and securities traded on other  over-the-counter
markets for which market quotations are readily available are valued at the mean
of the bid and asked prices;  and securities for which market quotations are not
readily available are valued at fair market value as determined in good faith by
or under the  direction of the Fund's Board of  Directors.  The  amortized  cost
method of valuation may also be used with respect to debt obligations with sixty
days or less remaining to maturity.

     With the  approval  of the  Board of  Directors,  the  Portfolio  may use a
pricing service, bank or broker-dealer  experienced in such matters to value the
Portfolio's  securities.  A more  detailed  discussion  of net  asset  value and
security valuation is contained in the Statement of Additional Information.

DIVIDENDS AND DISTRIBUTIONS
- --------------------------------------------------------------------------------

     The Fund will distribute substantially all of the net investment income and
net  realized  capital  gains,  if  any,  of the  Portfolio  to the  Portfolio's
shareholders.  All  distributions  are reinvested in the form of additional full
and fractional Shares of the Portfolio unless a shareholder elects otherwise.

     The Portfolio  will declare and pay dividends  from net  investment  income
monthly,  generally  near the end of each  month.  Net  realized  capital  gains
(including net short-term  capital gains),  if any, will be distributed at least
annually.

TAXES
- --------------------------------------------------------------------------------

     The  following  discussion is only a brief summary of some of the important
tax considerations generally affecting the Portfolio and its shareholders and is
not intended as a substitute for careful tax planning. Accordingly, investors in
the Portfolio should consult their tax advisers with specific reference to their
own tax situation.

     The  Portfolio  will elect to be taxed as a  regulated  investment  company
under Subchapter M of the Internal Revenue Code of 1986, as amended.  So long as
the Portfolio  qualifies for this tax treatment,  it will be relieved of federal
income tax on amounts  distributed to  shareholders,  but  shareholders,  unless
otherwise  exempt,  will  pay  income  or  capital  gains  taxes on  amounts  so
distributed (except distributions that constitute "exempt interest dividends" or
that  are  treated  as  a  return  of  capital)   regardless   of  whether  such
distributions are paid in cash or reinvested in additional shares.

     Distributions  out of the "net capital  gain" (the excess of net  long-term
capital gain over net short-term  capital loss),  if any, of the Portfolio,  and
out of the portion of such net capital gain that constitutes  long-term  capital
gain, will be taxed to shareholders as long-term capital gain, regardless of the
length  of time a  shareholder  has  held  his  shares,  whether  such  gain was
reflected  in  the  price  paid  for  the  shares,  or  whether  such  gain  was
attributable to bonds bear-

                                       16
<PAGE>

ing  tax-exempt  interest.  All  other  distributions,  to the  extent  they are
taxable,  are taxed to  shareholders  as ordinary  income.  The current  nominal
maximum marginal rate on ordinary income for individuals,  trusts and estates is
generally  39% while the maximum rate imposed on long-term  capital gain of such
taxpayers  is 20%.  Corporate  taxpayers  are  taxed at the  same  rates on both
ordinary income and capital gains.

     The Fund will send written notices to shareholders  annually  regarding the
tax  status  of  distributions  made by the  Portfolio.  Dividends  declared  in
October, November or December of any year payable to shareholders of record on a
specified  date in such a month  will be  deemed to have  been  received  by the
shareholders  on December 31, provided such dividends are paid during January of
the following year. The Portfolio  intends to make  sufficient  actual or deemed
distributions  prior to the end of each  calendar  year to avoid  liability  for
federal excise tax.

     Investors  should be careful to  consider  the tax  implications  of buying
shares just prior to a distribution.  The price of shares purchased at that time
will  reflect  the  amount  of the  forthcoming  distribution.  Those  investors
purchasing just prior to a distribution will nevertheless be taxed on the entire
amount of the distribution received.

     Shareholders  who exchange shares  representing  interests in one portfolio
for shares representing  interests in another portfolio will generally recognize
capital gain or loss for federal income tax purposes.  Under certain  provisions
of the Code, some shareholders may be subject to a 31% "backup"  withholding tax
on reportable dividends, capital gains distributions and redemption payments.

     Shareholders  who are  nonresident  alien  individuals,  foreign  trusts or
estates,  foreign  corporations  or  foreign  partnerships  may  be  subject  to
different U.S. federal income tax treatment.

DESCRIPTION OF SHARES
- --------------------------------------------------------------------------------

     The Fund has  authorized  capital of thirty billion shares of Common Stock,
$.001 par  value  per  share,  of which  18.326  billion  shares  are  currently
classified  into 97  different  classes  of Common  Stock (see  "Description  of
Shares" in the Statement of Additional Information).

     Shares of a class of Common  Stock in the Cash  Preservation  Family may be
exchanged for another class of Common Stock in such Family as well as for shares
of the RBB Class.  Otherwise,  no  exchanges  between  Families  or classes  are
permitted.

     THIS  PROSPECTUS AND THE STATEMENT OF ADDITIONAL  INFORMATION  INCORPORATED
HEREIN RELATE PRIMARILY TO THE GOVERNMENT  SECURITIES PORTFOLIO OF THE RBB CLASS
AND DESCRIBE ONLY THE INVESTMENT OBJECTIVE AND POLICIES,  OPERATIONS,  CONTRACTS
AND OTHER MATTERS RELATING TO THIS PORTFOLIO.

     Each  share that  represents  an  interest  in the  Portfolio  has an equal
proportionate interest in the assets belonging to such Portfolio with each other
share that  represents an interest in such  Portfolio,  even where a share has a
different class designation than another share  representing an interest in that
Portfolio.  Shares of the Fund do not have preemptive or conversion rights. When
issued for payment as described in this  Prospectus,  shares of the Fund will be
fully paid and non-assessable.

     The Fund currently does not intend to hold annual  meetings of shareholders
except  as  required  by the 1940 Act or other  applicable  law.  The law  under
certain circumstances provides shareholders with the right to call for a meeting
of shareholders to consider the removal of one or more directors.  To the extent
required  by law,  the Fund will  assist in  shareholder  communication  in such
matters.

     Holders of shares of the  Portfolio  will vote in the  aggregate and not by
class  on  all  matters,  except  where  otherwise  required  by  law.  Further,
shareholders of all investment portfolios of the Fund will vote in the aggregate
and not

                                       17
<PAGE>

by portfolio except as otherwise  required by law or when the Board of Directors
determines  that the matter to be voted upon affects  only the  interests of the
shareholders  of a  particular  investment  portfolio.  (See  the  Statement  of
Additional Information under "Additional Information Concerning Fund Shares" for
examples when the 1940 Act requires voting by investment portfolio or by class.)
Shareholders  of the Fund are  entitled  to one vote for each  full  share  held
(irrespective of class or portfolio) and fractional votes for fractional  shares
held.  Voting rights are not cumulative  and,  accordingly,  the holders of more
than 50% of the  aggregate  shares of Common  Stock of the Fund may elect all of
the directors.

     As of November 16, 1998, to the Fund's knowledge,  no person held of record
or  beneficially  25% or more of the  outstanding  shares of all  classes of the
Fund.

OTHER INFORMATION
- --------------------------------------------------------------------------------

REPORTS AND INQUIRIES

     Shareholders  will receive  unaudited  semi-annual  reports  describing the
Fund's  investment   operations  and  annual  financial  statements  audited  by
independent accountants.  Shareholder inquiries should be addressed to PFPC, the
Fund's transfer agent,  Bellevue Park Corporate  Center,  400 Bellevue  Parkway,
Wilmington, Delaware 19809, toll-free (800) 430-9618.

PERFORMANCE INFORMATION

     From time to time, the Portfolio may advertise its  performance,  including
comparisons  to other  mutual funds with similar  investment  objectives  and to
stock or other relevant indices.  All such  advertisements will show the average
annual total return, net of the Portfolio's maximum sales charge, over one, five
and ten year periods or, if such periods have not yet elapsed,  shorter  periods
corresponding to the life of the Portfolio. Such total return quotations will be
computed by finding the  compounded  average  annual  total return for each time
period that would equate the assumed initial investment, of $1,000 to the ending
redeemable value, net of the maximum sales charge and other fees, according to a
required standardized  calculation.  The standard calculation is required by the
SEC to provide consistency and comparability in investment company  advertising.
The  Portfolio  may  also  from  time to time  include  in such  advertising  an
aggregate  total return figure or a total return  figure that is not  calculated
according to the  standardized  formula in order to compare more  accurately the
Portfolio's  performance with other measures of investment  return. For example,
the  Portfolio's  total  return may be compared  with data  published  by Lipper
Analytical  Services,  Inc., CDA Investment  Technologies,  Inc. or Weisenberger
Investment Company Service, or with the performance of the Standard & Poor's 500
Stock  Index or the Dow  Jones  Industrial  Average.  For  these  purposes,  the
performance  of a  portfolio,  as  well  as the  performance  published  by such
services or experienced by such indices, will usually not reflect sales charges,
the  inclusion of which would reduce  performance  results.  All  advertisements
containing   performance  data  will  include  a  legend  disclosing  that  such
performance data represent past  performance and that the investment  return and
principal  value of an investment  will fluctuate so that an investor's  Shares,
when  redeemed,  may be worth  more or less than  their  original  cost.  If the
Portfolio  advertises  non-standard  computations,  however,  the Portfolio will
disclose the maximum sales charge and will also  disclose  that the  performance
data do not reflect  sales  charges and that  inclusion of sales  charges  would
reduce the performance quoted.

     From time to time, the Portfolio may also advertise its "30-day yield." The
yield of the  Portfolio  refers to the income  generated by an investment in the
Portfolio  over  the  30-day  period  identified  in the  advertisement,  and is
computed by dividing the net investment income per share earned by the Portfolio
during the period by the maximum public offering price per share of the last day
of the period. This income is "annualized" by assuming that the amount of income

                                       18
<PAGE>

is generated each month over a one-year period and is compounded  semi-annually.
The annualized income is then shown as a percentage of the net asset value.

     The yield on Shares of the Portfolio will fluctuate and is not  necessarily
representative  of future  results.  Shareholders  should remember that yield is
generally a function of  portfolio  quality and  maturity,  type of  instrument,
operating  expenses and market  conditions.  Any fees charged by  broker/dealers
directly to their customers in connection with  investments in the Portfolio are
not  reflected  in the  yields on the  Portfolio's  Shares,  and such  fees,  if
charged,  will  reduce the  actual  return  received  by  shareholders  on their
investments.  The yield on Shares of the RBB  Class may  differ  from  yields on
shares of other  classes of the Fund that also  represent  interests in the same
Portfolio depending on the allocation of expenses to each of the classes of that
Portfolio. See "Expenses."

                                       19
<PAGE>

================================================================================

NO  PERSON  HAS  BEEN   AUTHORIZED   TO  GIVE  ANY   INFORMATION   OR  MAKE  ANY
REPRESENTATIONS  NOT CONTAINED IN THIS PROSPECTUS OR IN THE FUND'S  STATEMENT OF
ADDITIONAL INFORMATION  INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE
OFFERING MADE BY THIS  PROSPECTUS  AND, IF GIVEN OR MADE,  SUCH  REPRESENTATIONS
MUST  NOT  BE  RELIED  UPON  AS  HAVING  BEEN  AUTHORIZED  BY  THE  FUND  OR ITS
DISTRIBUTOR.  THIS  PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY THE FUND OR BY
THE  DISTRIBUTOR IN ANY  JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY BE
MADE.


                        --------------------------------
                                TABLE OF CONTENTS

                                                                            PAGE
Introduction.............................................................      2
Financial Highlights.....................................................      4
Investment Objectives and Policies.......................................      6
Year 2000................................................................      9
Investment Limitations...................................................      9
Management...............................................................     10
Distribution of Shares...................................................     11
How to Purchase Shares...................................................     12
How to Redeem Shares.....................................................     14
Net Asset Value..........................................................     16
Dividends and Distributions..............................................     16
Taxes....................................................................     16
Description of Shares....................................................     17
Other Information........................................................     18
Account Application...................................................... Center
                                                      
INVESTMENT ADVISER
BlackRock Institutional Management Corporation
Wilmington, Delaware

DISTRIBUTOR
Provident Distributors, Inc.
West Conshohocken, Pennsylvania

CUSTODIAN
PFPC Trust Company
Wilmington, Delaware

ADMINISTRATOR AND TRANSFER AGENT
PFPC Inc.
Wilmington, Delaware

COUNSEL
Drinker Biddle & Reath LLP
Philadelphia, Pennsylvania

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers LLP
Philadelphia, Pennsylvania

================================================================================

<PAGE>
BEAR
STEARNS
[LOGO OMITTED]

MONEY MARKET
PORTFOLIO

Prospectus & Application
December 29, 1998


 FOR INFORMATION ABOUT THE BEAR STEARNS FUNDS, CONSULT THE FOLLOWING PROSPECTUS

<PAGE>

                             THE BEAR STEARNS FUNDS
               245 PARK AVENUE, NEW YORK, NY 10167 1-800-766-4111
PROSPECTUS

                             Money Market Portfolio
                                       of
                               The RBB Fund, Inc.

THE BEDFORD SHARES OF THE MONEY MARKET PORTFOLIO are a class of shares of common
stock of The RBB Fund, Inc. (the "Fund"), an open-end management investment
company. Shares of the Bedford Class offered by this Prospectus represent
interests in the Fund's Money Market Portfolio.

      [ARROW] The investment objective of the Money Market Portfolio is to
              provide as high a level of current interest income as is
              consistent with maintaining liquidity and stability of principal.
              It seeks to achieve such objective by investing in a diversified
              portfolio of U.S. dollar-denominated money market instruments.

SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY PNC BANK, NATIONAL ASSOCIATION, PFPC TRUST COMPANY OR ANY OTHER BANK AND
SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION,
THE FEDERAL RESERVE BOARD, OR ANY OTHER AGENCY. INVESTMENTS IN SHARES OF THE
FUND INVOLVE INVESTMENT RISKS, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL. THERE
CAN BE NO ASSURANCE THAT THE MONEY MARKET PORTFOLIO WILL BE ABLE TO MAINTAIN A
STABLE NET ASSET VALUE OF $1.00 PER SHARE.

BlackRock Institutional Management Corporation serves as investment adviser for
the Portfolio, PFPC Trust Company serves as custodian for the Fund and PFPC Inc.
serves as the administrator and transfer and dividend disbursing agent for the
Fund. Provident Distributors, Inc. acts as distributor for the Fund.

                       ----------------------------------

This Prospectus contains concise information that a prospective investor needs
to know before investing. Please keep it for future reference. A Statement of
Additional Information, dated December 29, 1998, has been filed with the
Securities and Exchange Commission and is incorporated by reference into this
Prospectus. It may be obtained upon request free of charge from the Fund by
calling (800) 430-9618. The Prospectus and Statement of Additional Information
are also available for reference, along with other related materials, on the SEC
Internet Website (http://www.sec.gov).

                       ----------------------------------

THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                                DECEMBER 29, 1998

<PAGE>

                                Table of Contents

                                                                            PAGE
                                                                      
Introduction .............................................................     3
                                                                      
Fee Table ................................................................     4
                                                                      
Financial Highlights .....................................................     6
                                                                      
Investment Objectives and Policies .......................................     7
                                                                      
Year 2000 ................................................................     9
                                                                      
Investment Limitations ...................................................    10
                                                                      
Purchase, Redemption and Exchange of Shares ..............................    11
                                                                      
Net Asset Value ..........................................................    16
                                                                      
Management ...............................................................    16
                                                                      
Distribution of Shares ...................................................    18
                                                                      
Dividends and Distributions ..............................................    19
                                                                      
Taxes ....................................................................    19
                                                                      
Description of Shares ....................................................    19
                                                                      
Other Information ........................................................    20
                                                                      
Account Application ..................................................... Center

                                       2

<PAGE>

                                  Introduction

The RBB Fund, Inc. (the "Fund") is an open-end management investment company
incorporated under the laws of the State of Maryland on February 29, 1988. The
Fund is currently operating or proposing to operate seventeen separate
investment portfolios. The shares ("Shares") of the Bedford Class (the "Bedford
Class" or the "Class") of common stock of the Fund offered by this Prospectus
represent interests in the Fund's Money Market Portfolio (the "Money Market
Portfolio" or the "Portfolio").

The MONEY MARKET PORTFOLIO'S investment objective is to provide as high a level
of current interest income as is consistent with maintaining liquidity and
stability of principal. It seeks to achieve such objective by investing in a
diversified portfolio of U.S. dollar-denominated money market instruments which
meet certain ratings criteria and present minimal credit risks. In pursuing its
investment objective, the Money Market Portfolio invests in a broad range of
government, bank and commercial obligations that may be available in the money
markets.

The Portfolio seeks to maintain a net asset value of $1.00 per share; however,
there can be no assurance that the Portfolio will be able to maintain a stable
net asset value of $1.00 per share.

The Portfolio's investment adviser is BlackRock Institutional Management
Corporation ("BIMC"). PFPC Trust Company serves as custodian to the Fund and
PFPC Inc. ("PFPC" or the "Administrator" or "Transfer Agent") serves as
administrator and transfer and dividend disbursing agent to the Fund. Provident
Distributors, Inc. ("PDI" or the "Distributor") acts as distributor of the
Fund's Shares.

An investor may purchase and redeem Shares of the Class through his broker or by
direct purchases or redemptions. See "Purchase and Redemption of Shares."

An investment in the Shares is subject to certain risks, as set forth in detail
under "Investment Objective and Policies." The Portfolio, to the extent set
forth under "Investment Objective and Policies," may engage in the following
investment practices: the use of repurchase agreements and reverse repurchase
agreements, the purchase of asset-backed securities, the purchase of securities
on a "when-issued" or "forward commitment" basis, the purchase of stand-by
commitments and the lending of securities. All of these transactions involve
certain special risks, as set forth under "Investment Objective and Policies."

                                       3

<PAGE>

                                    Fee Table

The Fee Table below contains a summary of the annual operating expenses incurred
by the Bedford Class of the Portfolio after fee waivers and expense
reimbursements for the fiscal year ended August 31, 1998, as a percentage of
average daily net assets. An example based on the summary is also shown.

ANNUAL FUND OPERATING EXPENSES (BEDFORD CLASS)
     AS A PERCENTAGE OF AVERAGE DAILY NET ASSETS
- --------------------------------------------------------------------------------
                                                                   MONEY MARKET
                                                                   PORTFOLIO
- --------------------------------------------------------------------------------
   Management Fees (after waivers)(1) ...........................       .23%
   12b-1 Fees(1) ................................................       .54%
   Other Expenses ...............................................       .20%
                                                                        ---
   Total Operating Expenses (Bedford Class)
   (after waivers)(1) ...........................................       .97%
                                                                        ===

- ---------
(1) Management Fees and 12b-1 Fees are based on average daily net assets and are
    calculated daily and paid monthly. Before waivers for the Money Market
    Portfolio, Management Fees would be .36% and Total Fund Operating Expenses 
    would be 1.10%.

EXAMPLE

   An investor would pay the following expenses on a $1,000 investment, assuming
   (1) 5% annual return and (2) redemption at the end of each time period:
- --------------------------------------------------------------------------------
                                                                   MONEY MARKET
                                                                   PORTFOLIO*
- --------------------------------------------------------------------------------
   1 YEAR .......................................................      $ 10
   3 YEARS ......................................................      $ 31
   5 YEARS ......................................................      $ 54
   10 YEARS .....................................................      $119


- ----------
 *Other classes of this Portfolio are sold with different fees and expenses.

The Example in the Fee Table assumes that all dividends and distributions are
reinvested and that the amounts listed under "Annual Fund Operating Expenses"
remain the same in the years shown. THE EXAMPLE SHOULD NOT BE CONSIDERED A
REPRESENTATION OF PAST OR FUTURE EXPENSES AND ACTUAL EXPENSES MAY BE GREATER OR
LESS THAN THOSE SHOWN. Long-term shareholders may pay more than the economic
equivalent of the maximum front-end sales charges permitted by the National
Association of Securities Dealers, Inc.

The Fee Table is designed to assist an investor in understanding the various
costs and expenses that an investor in the Bedford Class of the Fund will bear
directly or indirectly. (For more complete descriptions of the various costs and
expenses, see "Management -- Investment Adviser," and "Distribution of Shares"
below.) The expense figures are based on actual costs and fees charged to the
Class. The Fee Table reflects expense reimbursements and a voluntary waiver of
Management Fees for the Class. However, there can be no assurance that any
future expense reimbursements and waivers of Management Fees will not vary from
the figures reflected in the Fee Table. To the extent that any service providers
assume additional expenses of the Portfolio, such assumption will have the
effect of lowering such Portfolio's overall expense ratio and increasing its
yield to investors.

                                       4

<PAGE>

From time to time the Portfolio advertises its "total return", "yield" and
"effective yield." TOTAL RETURN AND YIELD FIGURES ARE BASED ON HISTORICAL
EARNINGS AND ARE NOT INTENDED TO INDICATE FUTURE PERFORMANCE. The "yield" of the
Portfolio refers to the income generated by an investment in the Portfolio over
a seven-day period (which period will be stated in the advertisement). This
income is then "annualized." That is, the amount of income generated by the
investment during that week is assumed to be generated each week over a 52-week
period and is shown as a percentage of the investment. The "effective yield" is
calculated similarly but, when annualized, the income earned by an investment in
a Portfolio is assumed to be reinvested. The "effective yield" will be slightly
higher than the "yield" because of the compounding effect of this assumed
reinvestment.

The total return and yield of any investment is generally a function of
portfolio quality and maturity, type of investment and operating expenses. The
total return and yield on Shares will fluctuate and is not necessarily
representative of future results. Any fees charged by broker/dealers directly to
their customers in connection with investments in Shares are not reflected in
the total returns and yields of the Shares, and such fees, if charged, will
reduce the actual return received by shareholders on their investments. The
total return and yield on Shares of the Class may differ from the total return
and yields on shares of other classes of the Fund that also represent interests
in the same Portfolio depending on the allocation of expenses to each class of
the Portfolio.

                                       5

<PAGE>

                              Financial Highlights

The table below sets forth certain information concerning the investment results
of the Bedford Class of the Fund representing interests in the Money Market
Portfolio for the years indicated. The financial data included in this table for
each of the periods ended August 31, 1994 through 1998 are a part of the Fund's
financial statements for the Portfolio, which are incorporated by reference into
the Statement of Additional Information and have been audited by
PricewaterhouseCoopers LLP ("PricewaterhouseCoopers"), the Fund's independent
accountants. The financial data for the periods ended August 31, 1989, 1990,
1991, 1992 and 1993 are a part of previous financial statements audited by
PricewaterhouseCoopers. The financial data included in this table should be read
in conjunction with the financial statements and related notes. Further
information about the performance of the Portfolio is available in the Annual
Report to Shareholders. Both the Statement of Additional Information and the
Annual Report to Shareholders may be obtained from the Fund free of charge by
calling the telephone number on Page 1 of the Prospectus.

<TABLE>
<CAPTION>
                                            FINANCIAL HIGHLIGHTS (c)
                               FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD

- -------------------------------------------------------------------------------------------------------------------------
                                                                    MONEY MARKET PORTFOLIO
- -------------------------------------------------------------------------------------------------------------------------
                                                                                                                         
                                                                                                                         
                                  FOR THE      FOR THE     FOR THE      FOR THE      FOR THE      FOR THE      FOR THE   
                                YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED 
                                AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31, 
                                   1998         1997         1996         1995         1994         1993         1992    
                                ----------   ----------   ----------   ----------   ----------   ----------   ---------- 
<S>                              <C>         <C>          <C>           <C>          <C>          <C>          <C>       
Net asset value,
   beginning of period           $   1.00    $     1.00   $     1.00    $   1.00     $   1.00     $   1.00     $   1.00  
                                 --------    ----------   ----------    --------     --------     --------     --------  
Income from investment
 operations:
  Net investment income            0.0473        0.0462       0.0469      0.0486       0.0278       0.0243       0.0375  
    Net gains on securities
     (both realized and
     unrealized)                       --            --           --          --           --           --       0.0007  
                                 --------    ----------   ----------    --------     --------     --------     --------  
  Total from investment
   operations                      0.0473        0.0462       0.0469      0.0486       0.0278       0.0243       0.0382  
                                 --------    ----------   ----------    --------     --------     --------     --------  
Less distributions
  Dividends (from net
   investment income)             (0.0473)      (0.0462)     (0.0469)    (0.0486)     (0.0278)     (0.0243)     (0.0375) 
  Distributions (from
   capital gains)                      --            --           --          --           --           --      (0.0007) 
                                 --------    ----------   ----------    --------     --------     --------     --------  
  Total distributions             (0.0473)      (0.0462)     (0.0469)    (0.0486)     (0.0278)     (0.0243)     (0.0382) 
                                 --------    ----------   ----------    --------     --------     --------     --------  
Net asset value, end of period   $   1.00    $     1.00   $     1.00    $   1.00     $   1.00     $   1.00     $   1.00  
                                 ========    ==========   ==========    ========     ========     ========     ========  
Total return                        4.84%         4.72%        4.79%       4.97%        2.81%        2.46%        3.89%  
Ratios/Supplemental Data
  Net assets,
   end of period (000)           $762,739    $1,392,911   $1,109,334    $935,821     $710,737     $782,153     $736,842  
  Ratios of expenses to
   average net assets              .97%(a)       .97%(a)      .97%(a)     .96%(a)      .95%(a)      .95%(a)      .95%(a) 
  Ratios of net investment
   income to average net
   assets                           4.73%         4.62%        4.69%       4.86%        2.78%        2.43%        3.75%  
</TABLE>

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------
                                           MONEY MARKET PORTFOLIO
- -----------------------------------------------------------------------------
                                                             FOR THE PERIOD
                                                           SEPTEMBER 30, 1988
                                  FOR THE      FOR THE       (COMMENCEMENT
                                 YEAR ENDED   YEAR ENDED    OF OPERATIONS) TO
                                 AUGUST 31,   AUGUST 31,       AUGUST 31,
                                    1991         1990             1989
                                 ----------   ----------   ------------------
<S>                               <C>          <C>              <C>
Net asset value,
   beginning of period            $   1.00     $   1.00         $   1.00
                                  --------     --------         --------
Income from investment
 operations:
  Net investment income             0.0629       0.0765           0.0779
    Net gains on securities
     (both realized and
     unrealized)                        --           --               --
                                  --------     --------         --------
  Total from investment
   operations                       0.0629       0.0765           0.0779
                                  --------     --------         --------
Less distributions
  Dividends (from net
   investment income)              (0.0629)     (0.0765)         (0.0779)
  Distributions (from
   capital gains)                       --           --               --
                                  --------     --------         --------
  Total distributions              (0.0629)     (0.0765)         (0.0779)
                                  --------     --------         --------
Net asset value, end of period    $   1.00     $   1.00         $   1.00
                                  ========     ========         ========
Total return                         6.48%        7.92%          8.81%(b)
Ratios/Supplemental Data
  Net assets,
   end of period (000)            $747,530     $709,757         $152,311
  Ratios of expenses to
   average net assets               .92%(a)      .92%(a)       .93%(a)(b)
  Ratios of net investment
   income to average net
   assets                            6.29%        7.65%          8.61%(b)

<FN>
- ------------
(a) Without the waiver of advisory fees and without their reimbursement of
    certain operating expenses, the ratios of expenses to average net assets for
    the Money Market Portfolio would have been 1.10%, 1.12%, 1.14%, 1.17%,
    1.16%, 1.19%, 1.20%, 1.17% and 1.16% for the years ended August 31, 1998,
    1997, 1996, 1995, 1994, 1993, 1992, 1991 and 1990, respectively, and 1.27%
    annualized for the period ended August 31, 1989.

(b) Annualized.

(c) Financial Highlights relate solely to the Class of Shares of the Fund within
    the Portfolio.
</FN>
</TABLE>

                                       6

<PAGE>

                       Investment Objectives and Policies

MONEY MARKET PORTFOLIO

The Money Market Portfolio's investment objective is to provide as high a level
of current interest income as is consistent with maintaining liquidity and
stability of principal. Portfolio obligations held by the Money Market Portfolio
have remaining maturities of 397 calendar days or less (exclusive of securities
subject to repurchase agreements). In pursuing its investment objective, the
Money Market Portfolio invests in a diversified portfolio of U.S.
dollar-denominated instruments, such as government, bank and commercial
obligations, that may be available in the money markets ("Money Market
Instruments") and that meet certain ratings criteria and present minimal credit
risks to the Money Market Portfolio. See "Eligible Securities." There is no
assurance that the investment objective of the Money Market Portfolio will be
achieved. The following descriptions illustrate the types of Money Market
Instruments in which the Money Market Portfolio invests.

BANK OBLIGATIONS.

The Portfolio may purchase obligations of issuers in the banking industry, such
as short-term obligations of bank holding companies, certificates of deposit,
bankers' acceptances and time deposits, including U.S. dollar-denominated
instruments issued or supported by the credit of U.S. or foreign banks or
savings institutions having total assets at the time of purchase in excess of $1
billion. The Portfolio may invest substantially in obligations of foreign banks
or foreign branches of U.S. banks where the investment adviser deems the
instrument to present minimal credit risks. Such investments may nevertheless
entail risks in addition to those of domestic issuers, including higher
transaction costs, less complete financial information, less stringent
regulatory requirements and less market liquidity. The Portfolio may also make
interest-bearing savings deposits in commercial and savings banks in amounts not
in excess of 5% of its total assets.

COMMERCIAL PAPER.

The Portfolio may purchase commercial paper (i) rated (at the time of purchase)
in the two highest rating categories of at least two nationally recognized
statistical rating organizations ("Rating Organizations") or, by the only Rating
Organization providing a rating; or (ii) issued by issuers (or, in certain cases
guaranteed by persons) with short-term debt having such rating. These rating
categories are described in the Appendix to the Statement of Additional
Information. The Portfolio may also purchase unrated commercial paper provided
that such paper is determined to be of comparable quality by the Portfolio's
investment adviser in accordance with guidelines approved by the Fund's Board of
Directors.

Commercial paper purchased by the Portfolio may include instruments issued by
foreign issuers, such as Canadian Commercial Paper ("CCP"), which is U.S.
dollar-denominated commercial paper issued by a Canadian corporation or a
Canadian counterpart of a U.S. corporation, and in Europaper, which is U.S.
dollar-denominated commercial paper of a foreign issuer, subject to the criteria
stated above for other commercial paper issuers.

VARIABLE RATE DEMAND NOTES.

The Portfolio may purchase variable rate demand notes, which are unsecured
instruments that permit the indebtedness thereunder to vary and provide for
periodic adjustment in the interest rate. Although the notes are not normally
traded and there may be no active secondary market in the notes, the Portfolio
will be able (at any time or during the specified periods not exceeding 13
months, depending upon the note involved) to demand payment of the principal of
a note. The notes are not typically rated by credit rating agencies, but issuers
of variable rate demand notes must satisfy the same criteria as set forth above
for issuers of commercial paper. If an issuer of a variable rate demand note
defaulted on its payment obligation, the Portfolio might be unable to dispose of
the note because of the absence of an active secondary market. For this or other
reasons, the Portfolio might suffer a loss to the extent of the default. The
Portfolio invests in variable rate demand notes only when the Portfolio's
investment adviser deems the investment to involve minimal credit risk. The
Portfolio's investment adviser also monitors the continuing creditworthiness of
issuers of such notes to determine whether the Portfolio should continue to hold
such notes.

                                       7

<PAGE>

REPURCHASE AGREEMENTS.

The Portfolio may agree to purchase securities from financial institutions
subject to the seller's agreement to repurchase them at an agreed-upon time and
price ("repurchase agreements"). The securities held subject to a repurchase
agreement may have stated maturities exceeding 13 months, provided the
repurchase agreement itself matures in less than 13 months. Default by or
bankruptcy of the seller would, however, expose the Portfolio to possible loss
because of adverse market action or delays in connection with the disposition of
the underlying obligations.

U.S. GOVERNMENT OBLIGATIONS.

The Portfolio may purchase obligations issued or guaranteed by the U.S.
Government or its agencies and instrumentalities. Obligations of certain
agencies and instrumentalities of the U.S. Government are backed by the full
faith and credit of the United States. Others are backed by the right of the
issuer to borrow from the U.S. Treasury or are backed only by the credit of the
agency or instrumentality issuing the obligation.

ASSET-BACKED SECURITIES.

The Portfolio may invest in asset-backed securities which are backed by
mortgages, installment sales contracts, credit card receivables or other assets
and collateralized mortgage obligations ("CMOs") issued or guaranteed by U.S.
Government agencies and instrumentalities or issued by private companies.
Asset-backed securities also include adjustable rate securities. The estimated
life of an asset-backed security varies with the repayment experience with
respect to the underlying debt instruments. For this and other reasons, an
asset-backed security's stated maturity may be shortened, and the security's
total return may be difficult to predict precisely. Such difficulties are not
expected, however, to have a significant effect on the Portfolio since the
remaining maturity of any asset-backed security acquired will be 13 months or
less. Asset-backed securities are considered an industry for industry
concentration purposes. See "Investment Limitations." In periods of falling
interest rates, the rate of mortgage repayments tends to increase. During these
periods, the reinvestment of proceeds by a portfolio will generally be at lower
rates than the rates on the prepaid obligations.

REVERSE REPURCHASE AGREEMENTS.

The Portfolio may enter into reverse repurchase agreements with respect to
portfolio securities. A reverse repurchase agreement involves a sale by a
portfolio of securities that it holds concurrently with an agreement by the
Portfolio to repurchase them at an agreed upon time and price. Reverse
repurchase agreements involve the risk that the market value of the securities
sold by the Portfolio may decline below the price at which the Portfolio is
obligated to repurchase them. Reverse repurchase agreements are considered to be
borrowings by the Portfolio under the Investment Company Act of 1940 ("1940
Act").

MUNICIPAL OBLIGATIONS.

In addition, the Portfolio may, when deemed appropriate by its investment
adviser in light of the Portfolio's investment objective, invest without
limitation in high quality, short-term Municipal Obligations issued by state and
local governmental issuers, the interest on which may be taxable or tax-exempt
for federal income tax purposes, provided that such obligations carry yields
that are competitive with those of other types of Money Market Instruments of
comparable quality. For a more complete discussion of Municipal Obligations, see
Statement of Additional Information under "Investment Objectives and Policies."

GUARANTEED INVESTMENT CONTRACTS.

The Portfolio may make investments in obligations, such as guaranteed investment
contracts and similar funding agreements (collectively "GICs"), issued by highly
rated U.S. insurance companies. A GIC is a general obligation of the issuing
insurance company and not a separate account. The Portfolio's investments in
GICs are not expected to exceed 5% of its total assets at the time of purchase
absent unusual market conditions. GIC investments are subject to the Fund's
policy regarding investments in illiquid securities.

STAND-BY COMMITMENTS.

The Portfolio may acquire "stand-by commitments" with respect to Municipal
Obligations held in its portfolio. Under a stand-by commitment, a dealer would
agree to purchase at the Portfolio's option specified Municipal Obligations at a
specified price. The acquisition of a stand-by commitment may

                                       8

<PAGE>

increase the cost, and thereby reduce the yield, of the Municipal Obligation to
which such commitment relates. The Portfolio will acquire stand-by commitments
solely to facilitate portfolio liquidity and does not intend to exercise its
rights thereunder for trading purposes.

WHEN-ISSUED SECURITIES.

The Portfolio may purchase portfolio securities on a "when-issued" basis.
When-issued securities are securities purchased for delivery beyond the normal
settlement date at a stated price and yield. The Portfolio will generally not
pay for such securities or start earning interest on them until they are
received. Securities purchased on a when-issued basis are recorded as an asset
at the time of the commitment is entered into and are subject to changes in
value prior to delivery based upon changes in the general level of interest
rates. The Portfolio expects that commitments to purchase when-issued securities
will not exceed 25% of the value of its total assets absent unusual market
conditions. The Portfolio does not intend to purchase when-issued securities for
speculative purposes but only in furtherance of its investment objective.

ELIGIBLE SECURITIES.

The Portfolio will only purchase "eligible securities" that present minimal
credit risks as determined by the Portfolio's investment adviser pursuant to
guidelines adopted by the Board of Directors. Eligible securities generally
include: (1) U.S. Government securities, (2) securities that are rated at the
time of purchase in the two highest rating categories by at least two Rating
Organizations ("Rating Organizations") (e.g. commercial paper rated "A-1" or
"A-2" by Standard & Poor's Ratings Services ("S&P")), (3) securities that are
rated at the time of purchase by the only Rating Organization rating the
security in one of its two highest rating categories for such securities, (4)
securities issued by issuers (or, in certain cases guaranteed by persons) with
short-term debt having such ratings, and (5) securities that are not rated and
are issued by an issuer that does not have comparable obligations rated by
Rating Organization ("Unrated Securities"), provided that such securities are
determined to be of comparable quality to eligible rated securities. For a more
complete description of eligible securities, see "Investment Objectives and
Policies" in the Statement of Additional Information.

ILLIQUID SECURITIES.

The Portfolio will not invest more than 10% of its net assets in illiquid
securities, including repurchase agreements which have a maturity of longer than
seven days, time deposits with maturities in excess of seven days, variable rate
demand notes with demand periods in excess of seven days unless the Portfolio's
investment adviser determines that such notes are readily marketable and could
be sold promptly at the prices at which they are valued, GICs, and other
securities that are illiquid by virtue of the absence of a readily available
market or legal or contractual restrictions on resale. Repurchase agreements
subject to demand are deemed to have a maturity equal to the notice period.
Securities that have legal or contractual restrictions on resale but have a
readily available market are not deemed illiquid for purposes of this
limitation. The Portfolio's investment adviser will monitor the liquidity of
such restricted securities under the supervision of the Board of Directors. See
"Investment Objectives and Policies -- Illiquid Securities" in the Statement of
Additional Information.

                                    Year 2000

Like other mutual funds, financial and business organizations and individuals
around the world, the Fund could be adversely affected if the computer systems
used by the Adviser and the Fund's other service providers, or persons with whom
they deal, do not properly process and calculate date-related information and
data from and after January 1, 2000. This possibility is commonly known as the
"Year 2000 Problem." The Year 2000 Problem could also hurt companies whose
securities the Fund holds or securities markets generally. The Fund has been
advised by the Adviser, the Administrators and the Custodian that they are
actively taking steps to address the Year 2000 Problem with respect to the
computer systems that they use and to obtain assurances that comparable steps
are being taken by the Fund's other major service providers. While there can be
no assurance that the Fund's service providers will be Year 2000 compliant, the
Fund's service providers expect that their plans to be compliant will be
achieved.

                                       9

<PAGE>

                             Investment Limitations

The Money Market Portfolio's investment objective and policies described above
may be changed by the Fund's Board of Directors without shareholder approval.
The Portfolio may not, however, change the investment limitations summarized
below without such a vote of shareholders. (A more detailed description of the
following investment limitations, together with other investment limitations
that cannot be changed without a vote of shareholders, is contained in the
Statement of Additional Information under "Investment Objectives and Policies.")

     THE MONEY MARKET PORTFOLIO MAY NOT:

          1. Purchase any securities other than Money Market Instruments, some
     of which may be subject to repurchase agreements, but the Portfolio may
     make interest-bearing savings deposits in amounts not in excess of 5% of
     the value of the Portfolio's assets and may make time deposits.

          2. Borrow money, except from banks for temporary purposes and except
     for reverse repurchase agreements, and then in amounts not in excess of 10%
     of the value of the Portfolio's assets at the time of such borrowing, and
     only if after such borrowing there is asset coverage of at least 300% for
     all borrowings of the Portfolio; or mortgage, pledge or hypothecate any of
     its assets except in connection with any such borrowing and in amounts not
     in excess of 10% of the value of the Portfolio's assets at the time of such
     borrowing; or purchase portfolio securities while borrowings are in excess
     of 5% of the Portfolio's net assets are outstanding. (This borrowing
     provision is not for investment leverage, but solely to facilitate
     management of the Portfolio's securities by enabling the Portfolio to meet
     redemption requests where the liquidation of portfolio securities is deemed
     to be disadvantageous or inconvenient.)

          3. Purchase any securities which would cause, at the time of purchase,
     less than 25% of the value of the total assets of the Portfolio to be
     invested in the obligations of issuers in the banking industry, or in
     obligations, such as repurchase agreements, secured by such obligations
     (unless the Portfolio is in a temporary defensive position) or which would
     cause, at the time of purchase, more than 25% of the value of its total
     assets to be invested in the obligations of issuers in any other industry.

          4. Purchase securities of any one issuer, other than securities issued
     or guaranteed by the U.S. Government or its agencies and instrumentalities,
     if immediately after and as a result of such purchase more than 5% of the
     value of its total assets would be invested in the securities of such
     issuer, or more than 10% of the outstanding voting securities of such
     issuer would be owned by the Portfolio, except that up to 25% of the value
     of the Portfolio's total assets may be invested without regard to such 5%
     limitation.

So long as it values its portfolio securities on the basis of the amortized cost
method of valuation pursuant to Rule 2a-7 under the 1940 Act, the Money Market
Portfolio will meet the following limitations on its investments in addition to
the fundamental investment limitations described above. These limitations may be
changed without a vote of shareholders of the Money Market Portfolio.

          1. The Money Market Portfolio will limit its purchases of the
     securities of any one issuer, other than issuers of U.S. Government
     securities, to 5% of its total assets, except that the Money Market
     Portfolio may invest more than 5% of its total assets in First Tier
     Securities of one issuer for a period of up to three Business Days, (as
     defined below). "First Tier Securities" include eligible securities that
     (i) if rated by more than one Rating Organization, are rated (at the time
     of purchase) by two or more Rating Organizations in the highest rating
     category for such securities, (ii) if rated by only one Rating
     Organization, are rated by such Rating Organization in its highest rating
     category for such securities, (iii) have no short-term rating and are
     comparable in priority and security to a class of short-term obligations of
     the issuer of such securities that have been rated in accordance with (i)
     or (ii) above, or (iv) are Unrated Securities that are determined to be of
     comparable quality to such securities. Purchases of First Tier Securities
     that come within categories (ii) and (iv) above will be approved or
     ratified by the Board of Directors.

          2. The Money Market Portfolio will limit its purchases of Second Tier
     Securities, which are eligible securities other than First Tier Securities,
     to 5% of its total assets.

          3. The Money Market Portfolio will limit its purchases of Second Tier
     Securities of one issuer to the greater of 1% of its total assets or $1
     million.

                                       10

<PAGE>

THE BEAR STEARNS FUNDS

ACCOUNT INFORMATION FORM

Please Note: Do not use this form to open a retirement plan account. For
retirement plan forms call 1-800-766-4111. For assistance in completing this
form, contact PFPC at 1-800-447-1139.

1.       ACCOUNT TYPE  (Please print; indicate only one registration type)

         [__] INDIVIDUAL                    [__] JOINT TENANT

         -----------------------------------------------------------------------
         NAME


         -----------------------------------------------------------------------
         JOINT REGISTRANT, IF ANY (SEE NOTES 1 AND 2)


         ---------------------------------------  ------------------------------
         SOCIAL SECURITY NUMBER OF PRIMARY OWNER  TAXPAYER IDENTIFICATION NUMBER

         (1)  Use only the Social Security number or Taxpayer Identification 
              Number of the first listed joint tenant.

         (2)  For joint registrations, the account registrants will be joint
              tenants with right of survivorship and not tenants in common
              unless tenants in common or community property registrations
              are requested.


          ------------------------------         -------------------------------
         [__] UNIFORM GIFT TO MINORS, OR         [__] UNIFORM TRANSFER TO MINORS
                                                      (WHERE ALLOWED BY LAW)


         -----------------------------------------------------------------------
         NAME OF ADULT CUSTODIAN (ONLY ONE PERMITTED)


         -----------------------------------------------------------------------
         NAME OF MINOR (ONLY ONE PERMITTED)

         Under the ________________________ Uniform Gift/Transfers to Minors Act
                   STATE RESIDENCE OF MINOR

         ------/------/------                     --------------------------
         MINOR'S DATE OF BIRTH                    MINOR'S SOCIAL SECURITY NUMBER
                                                  (REQUIRED TO OPEN ACCOUNT)


         [__] Corporation  [__] Partnership  [__] Trust*  [__] Other


         -----------------------------------------------------------------------
         NAME OF CORPORATION, PARTNERSHIP, OR OTHER


         -----------------------------------------------------------------------
         NAME(S) OF TRUSTEE(S)                       DATE OF THE TRUST AGREEMENT


         --------------------------               ------------------------------
         SOCIAL SECURITY NUMBER                   TAXPAYER IDENTIFICATION NUMBER
         (REQUIRED TO OPEN ACCOUNT)               (REQUIRED TO OPEN ACCOUNT)

   *If a Trust, include date of trust instrument and list of trustees if they 
    are to be named in the registration.

                           NOT PART OF THE PROSPECTUS
<PAGE>


2.       MAILING ADDRESS


         -----------------------------------------------------------------------
         STREET OR P.O. BOX                                     APARTMENT NUMBER


         -----------------------------------------------------------------------
         CITY                                        STATE              ZIP CODE

         (   )                                        (   )
         -----------------------------------------------------------------------
         DAY TELEPHONE                                EVENING TELEPHONE


3.       INVESTMENT INFORMATION

         METHOD OF INVESTMENT

         [__] I have enclosed a check for a minimum initial investment of 
              $1,000 per Fund.
         [__] I have enclosed a check for a minimum subsequent investment of 
              $250 per Fund or completed the Systematic Investment Plan
              information in Section 13.
         [__] I purchased _____________ shares of __________________________ 
              through my broker on __/__/__.  Conform #___________.

         PLEASE MAKE MY INVESTMENT IN THE FUNDS DESIGNATED BELOW:

<TABLE>

         ---------------------------------------------------------------------------------------------
          <S>           <C>            <C>              <C>                                 <C>
         CLASS A      CLASS C       CLASS Y      BEAR STEARNS FUNDS                  INVESTMENT AMOUNT
         ---------------------------------------------------------------------------------------------

         _______      _______       _______      S&P STARS Portfolio                 $________________
         _______      _______       _______      Large Cap Value Portfolio           $________________
         _______      _______       _______      Small Cap Value Portfolio           $________________
         _______      _______       _______      Total Return Bond Portfolio         $________________
         _______      _______       _______      The Insiders Select Fund            $________________
         _______      _______       _______      Emerging Markets Debt Portfolio     $________________
         _______      _______       _______      Money Market Portfolio              $________________

                                                 TOTAL INVESTMENT AMOUNT             $================
</TABLE>

         Note: All shares purchased will be held in a shareholder account for
         the investor at the Transfer Agent. Checks drawn on foreign banks and
         checks made payable to persons or entities other than the Fund will not
         be accepted. Checks should be made payable to the Fund which you are
         investing in. If no class is designated, your investment will be made
         in Class A shares.


4.       REDUCED SALES CHARGE (AVAILABLE FOR CLASS A SHARES ONLY)

         Method of Investment

         Are you a shareholder in another Bear Stearns Fund?   [__] Yes  [__] No

         [__]  I apply for Right of Accumulation reduced sales charges
               based on the following Bear Stearns Fund Accounts
               (excluding Class C Shares).


         -----------------------------------------------------------------------
         FUND                           ACCOUNT NUMBER OR SOCIAL SECURITY NUMBER


         -----------------------------------------------------------------------
         FUND                           ACCOUNT NUMBER OR SOCIAL SECURITY NUMBER


         -----------------------------------------------------------------------
         FUND                           ACCOUNT NUMBER OR SOCIAL SECURITY NUMBER

         LETTER OF INTENT

                           NOT PART OF THE PROSPECTUS
<PAGE>

         [__]  I am already investing under an existing Letter of Intent.

         [__]  I agree to the Letter of Intent provisions in the Fund's current 
               prospectus.  During a 13-month period, I plan to invest a dollar 
               amount of at least:
               [__] $50,000    [__] $100,000    [__] $250,000
               [__] $500,000   [__] $750,000    [__] $1,000,000

         NET ASSET VALUE PURCHASE

         [__]  I qualify for an exemption from the sales charge by meeting the 
               conditions set forth in the prospectus.  (Please attach 
               certification to this form.)

         [__]  I qualify to purchase shares at net asset value, with
               proceeds received from a mutual fund or closed-end fund
               not distributed by Bear Stearns. (Please attach proof of
               fund share redemption.)


5.       DISTRIBUTION OPTIONS

         DIVIDENDS AND CAPITAL GAINS MAY BE REINVESTED OR PAID BY CHECK. IF NO
         OPTIONS ARE SELECTED BELOW, BOTH DIVIDENDS AND CAPITAL GAINS WILL BE
         REINVESTED IN ADDITIONAL FUND SHARES.

         DIVIDENDS             [__] Pay by check.             [__] Reinvest.
         CAPITAL GAINS         [__] Pay by check.             [__] Reinvest.

         The Redirected Distribution Option allows an investor to have dividends
         and any other distributions from a Fund automatically used to purchase
         shares of the same class of any other Fund. The receiving account must
         be in the same name as your existing account.

         [__] Please reinvest dividends and capital gains from the
              _____________________ to the _______________________.
                  (NAME OF FUND)               (NAME OF FUND)

         If you elect to have distributions paid by check, distributions will be
         sent to the address of record. Distributions may also be sent to
         another payee:



         -----------------------------------------------------------------------
         NAME


         -----------------------------------------------------------------------
         STREET OR P.O. BOX                                     APARTMENT NUMBER


         -----------------------------------------------------------------------
         CITY                                    STATE                  ZIP CODE


         -----------------------------------------------------------------------
         OPTIONAL FEATURES


6.       AUTOMATIC WITHDRAWAL PLAN

         [__] Fund Name _________________________     [__] Amount ______________
         [__] Startup month _____________________

         Frequency option:
         [__] Monthly  [__] Every other month  [__] Quarterly  [__] Semiannually
         [__] Annually

         o   A minimum account value of $5,000 in a single account is required 
             to establish an automatic withdrawal plan.

         o   Payments will be made on or near the 25th of the month.

         o   Shareholders holding share certificates are not eligible for the 
             Automatic Withdrawal Plan.

                           NOT PART OF THE PROSPECTUS
<PAGE>

         [__]  Please mail checks to Address of Record (Named in Section 2)
         [__]  Please electronically credit my Bank of Record 
               (Named in Section 9)
         [__]  Special payee as specified below:


         -----------------------------------------------------------------------
         NAME


         -----------------------------------------------------------------------
         STREET OR P.O. BOX                                     APARTMENT NUMBER


         -----------------------------------------------------------------------
         CITY                                    STATE                  ZIP CODE


7.       TELEPHONE EXCHANGE PRIVILEGE

         Unless indicated below, I authorize the Transfer Agent to accept
         instructions from any persons to exchange shares in my account(s) by
         telephone, in accordance with the procedures and conditions set forth
         in the Fund's current prospectus.

         [__]  I DO NOT want the Telephone Exchange Privilege.


8.       TELEPHONE REDEMPTION PRIVILEGE

         [__] I authorize the Transfer Agent to accept instructions from any
         person to redeem shares in my account(s) by telephone, in accordance
         with the procedures and conditions set forth in the Fund's current
         prospectus.

         Checks for redemption of proceeds will be sent by check via U.S. Mail
         to the address to record, unless the information in Section 9 is
         completed for redemption by wire of $500 or more.


9.       BANK OF RECORD (FOR TELEPHONE REDEMPTIONS AND/OR SYSTEMATIC INVESTMENT
         PLANS) PLEASE ATTACH A VOIDED CHECK (FOR ELECTRONIC CREDIT TO YOUR
         CHECKING ACCOUNT) IN THE SPACE PROVIDED IN SECTION 13.


         -----------------------------------------------------------------------
         BANK NAME


         -----------------------------------------------------------------------
         STREET OR P.O. BOX                                     APARTMENT NUMBER


         -----------------------------------------------------------------------
         CITY                                    STATE                  ZIP CODE


         -----------------------------------------------------------------------
         BANK ABA NUMBER                                     BANK ACCOUNT NUMBER


         -----------------------------------------------------------------------
         ACCOUNT NAME


10.      SIGNATURE AND TAXPAYER CERTIFICATION

         The undersigned warrants that I(we) have full authority and, if a
         natural person, I(we) am(are) of legal age to purchase shares pursuant
         to this Account Information Form, and have received a current
         prospectus for the Bear Stearns Fund(s) in which I(we) am(are)
         investing. THE UNDERSIGNED ACKNOWLEDGES THAT THE TELEPHONE EXCHANGE
         PRIVILEGE IS AUTOMATIC AND THAT I(WE) MAY BEAR THE RISK OF LOSS IN
         EVENT OF FRAUDULENT USE OF THE PRIVILEGE. If I(we) do not want the
         Telephone Exchange Privilege, I(we) have so indicated on this Account
         Information Form.

         Under the Interest and Dividend Tax Compliance Act of 1983, the Fund is
         required to have the following certification:

         Under penalty of perjury, I certify that:

                           NOT PART OF THE PROSPECTUS
<PAGE>

         (1)  The number shown on this form is my correct taxpayer 
         identification number (or I am waiting for a number to be issued to
         me), and

         (2) I am not subject to backup withholding because (a) I am exempt from
         backup withholding or (b) I have not been notified by the Internal
         Revenue Service that I am subject to 31% backup withholding as a result
         of a failure to report all interest or dividends or (c) the IRS has
         notified me that I am no longer subject to backup withholding.

         Certification Instructions - You must cross out item (2) above if you
         have been notified by the IRS that you are currently subject to backup
         withholding because of underreporting of interest or dividends on your
         tax return. MUTUAL FUND SHARES ARE NOT DEPOSITS OF, OR GUARANTEED BY,
         ANY DEPOSITORY INSTITUTION, NOR ARE THEY INSURED BY THE FDIC.
         INVESTMENT IN THE FUNDS INVOLVES INVESTMENT RISKS, INCLUDING POSSIBLE
         LOSS OF PRINCIPAL.

         [__]  Exempt from backup withholding    
         [__]  Nonresident alien (Form W-8 attached) ___________________________
                                                       COUNTRY OF CITIZENSHIP


         -----------------------------------------------------------------------
         AUTHORIZED SIGNATURE            TITLE                          DATE


         -----------------------------------------------------------------------
         AUTHORIZED SIGNATURE            TITLE                          DATE


11.      FOR AUTHORIZED DEALER USE ONLY (Please Print)

         We hereby authorize the Transfer Agent to act as our agent in
         connection with the transactions authorized by the Account Information
         Form and agree to notify the Transfer Agent of any purchases made under
         a Letter of Intent or Right of Accumulation. If this Account
         Information Form includes a Telephone Exchange Privilege authorization,
         a Telephone Redemption Privilege authorization or an Automatic
         Withdrawal Plan request, we guarantee the signature(s) above.


         -----------------------------------------------------------------------
         DEALER'S NAME                                  DEALER NUMBER


         -----------------------------------------------------------------------
         MAIN OFFICE ADDRESS                            BRANCH NUMBER


         -----------------------------------------------------------------------
         REPRESENTATIVE'S NAME                          REP. NUMBER

                                                        (   )
         -----------------------------------------------------------------------
         BRANCH ADDRESS                                 TELEPHONE NUMBER


         -----------------------------------------------------------------------
         AUTHORIZED SIGNATURE OF DEALER             TITLE               DATE


12.      ADDITIONAL ACCOUNT STATEMENTS (Please Print)

         In addition to myself and my representative, please send copies of my
         account statements to:


         -----------------------------------------------------------------------
         NAME                                             NAME


         -----------------------------------------------------------------------
         ADDRESS                                          ADDRESS


         -----------------------------------------------------------------------
         CITY, STATE, ZIP CODE                            CITY, STATE, ZIP CODE

                           NOT PART OF THE PROSPECTUS
<PAGE>

13.      SYSTEMATIC INVESTMENT PLAN

         The Systematic Investment Plan, which is available to shareholders of
         the Bear Stearns Funds, makes possible regularly scheduled purchases of
         Fund shares to allow dollar-cost averaging. The Funds' Transfer Agent
         can arrange for an amount of money selected by you ($100 minimum) to be
         deducted from your checking account and used to purchase shares of a
         specified Bear Stearns Fund. A $250 minimum initial investment is
         required. This may not be used in conjunction with the Automatic
         Withdrawal Plan.

         Please debit $__________ from my checking account (named in Section 9)
         on or about the 20th of the month. Depending on the Application receipt
         date, the Plan may take 10 to 20 days to be in effect.

         [__] Monthly               [__] Every alternate month
         [__] Quarterly             [__] Other _______________

         $____________ into the _______________ Fund ______________ Start Month.
         $100 MINIMUM

         $____________ into the _______________ Fund ______________ Start Month.
         $100 MINIMUM

         $____________ into the _______________ Fund ______________ Start Month.
         $100 MINIMUM

         If you are applying for the Telephone Redemption Privilege or
         Systematic Investment Plan, please tape your voided check on top of our
         sample below.



                                [TAPE CHECK HERE]






     SERVICE ASSISTANCE                          MAILING INSTRUCTIONS

     Our knowledgeable Client Services           Mail your completed Account 
     Representatives are available to            Information Form and check to:
     assist you between 8:30 a.m. and            THE BEAR STEARNS FUNDS
     5:00 p.m. Eastern Time at:                  C/O PFPC INC.
     1-800-447-1139                              P.O. BOX 8960 
                                                 WILMINGTON, DE  19899-8960

Bear Stearns & Co, Inc.

                           NOT PART OF THE PROSPECTUS
<PAGE>

                   Purchase, Redemption and Exchange of Shares

PURCHASE PROCEDURES

GENERAL.

Bedford Shares are sold without a sales load on a continuous basis by the Fund's
Distributor. The Distributor is located at Four Falls Corporate Center, West
Conshohocken, Pennsylvania 19428. Investors may purchase Bedford Shares either
directly, through an exchange from accounts invested in shares of any open-end
investment company ("The Bear Stearns Funds") either sponsored by or advised by
Bear, Stearns & Co. Inc. ("Bear Stearns"), or its affiliates, or through an
account (the "Account") maintained by the investor with certain brokerage firms
and may also purchase Shares directly by mail or wire. The minimum initial
investment is $1,000, and the minimum subsequent investment is $250. The Fund in
its sole discretion may accept or reject any order for purchases of Bedford
Shares.

All payments for initial and subsequent investments should be in U.S. dollars.
Purchases will be effected at the net asset value next determined after PFPC,
the Fund's transfer agent, has received a purchase order in good order and the
Fund's custodian has Federal Funds immediately available to it. In those cases
where payment is made by check, Federal Funds will generally become available
two Business Days after the check is received. Orders which are accompanied by
Federal Funds, and received by the Fund by 12:00 noon Eastern Time, and orders
as to which payment has been converted into Federal Funds by 12:00 noon Eastern
Time, will be executed as of 12:00 noon that Business Day. A "Business Day" is
any day that both the New York Stock Exchange (the "NYSE") and the Federal
Reserve Bank of Philadelphia (the "FRB") are open. On any Business Day, orders
which are accompanied by Federal Funds and received by PFPC after 12:00 noon
Eastern Time but prior to the close of regular trading on the NYSE (generally
4:00 p.m. Eastern Time), and orders as to which payment has been converted into
Federal Funds after 12:00 noon Eastern Time but prior to the close of regular
trading on the NYSE on any Business Day of the Fund, will be executed as of the
close of regular trading on the NYSE on that Business Day but will not be
entitled to receive dividends declared on such Business Day. Orders which are
accompanied by Federal Funds and received by the Fund as of the close of regular
trading on the NYSE or later, and orders as to which payment has been converted
to Federal Funds as of the close of regular trading on the NYSE or later on a
Business Day will be processed as of 12:00 noon Eastern Time on the following
Business Day.

If a broker makes special arrangements under which orders for Bedford Shares are
received by PFPC prior to 12:00 noon Eastern Time, and the broker guarantees
that payment for such Shares will be made in Federal Funds to the Fund's
custodian prior to the close of regular trading on the NYSE on the same day,
such purchase orders will be effective and Shares will be purchased at the
offering price in effect as of 12:00 noon Eastern Time on the date the purchase
order is received by PFPC.

PURCHASES THROUGH AN ACCOUNT.

Purchases of Shares may be effected through brokers (other than Bears Stearns or
brokers who have clearing arrangements with Bear Stearns) and may be made by
check (except that a check drawn on a foreign bank will not be accepted),
Federal Reserve draft or by wiring Federal Funds with funds held in the
brokerage accounts. Checks or Federal Reserve drafts should be made payable as
follows: (i) to an investor's broker or (ii) to "The RBB Fund-Money Market
Portfolio (Bedford Class)" if purchased directly from the Portfolio, and should
be directed to the Transfer Agent: PFPC Inc., Attention: The RBB Fund-Money
Market Portfolio (Bedford Class), P.O. Box 8960, Wilmington, Delaware 19899. The
investor's broker is responsible for forwarding payment promptly to the Fund's
custodian, PFPC Trust Company. An investor's bank or broker may impose a charge
for this service.

In the event of a purchase effected through an investor's Account with his
broker through procedures established in connection with the requirements of
Accounts at such broker, beneficial ownership of Shares will be recorded by the
broker and will be reflected in the Account statements provided by the broker to
such investors. A broker may impose minimum investor Account requirements. Even
if a broker does not impose a sales charge for purchases of Bedford Shares,
depending on the terms of an investor's Account with his broker, the broker may
charge an investor's Account fees for automatic investment and other services
provided to the Account. Information concerning Account requirements, services
and charges should be obtained from an investor's broker, and this Prospectus
should be read in conjunction with any information received from a broker.
Shareholders whose shares are held in the

                                       11

<PAGE>

street name account of a broker/dealer and who desire to transfer such shares to
the street name account of another broker/dealer should contact their current
broker/dealer.

A Shareholder of The Bear Stearns Funds may purchase Bedford Shares of the
Portfolio in exchange for his shares of The Bear Stearns Funds. This exchange
privilege is available for an investor with an existing account. See "Exchange
of Shares" below.

For distribution services with respect to Bedford Shares of the Portfolio held
by clients of Bear Stearns, the Fund's Distributor will pay Bear Stearns up to
 .50% of the annual average value of such accounts.

DIRECT PURCHASES.

Investors may purchase the Portfolio's shares by mail by completing and signing
an Account Information Form (the "Application"), a copy of which is attached to
this Prospectus, and mailing it, together with a check payable to "The RBB
Fund--Money Market Portfolio (Bedford Class)," to Bedford Money Market
Portfolio, c/o PFPC, P.O. Box 8960, Wilmington, Delaware 19899. The check must
specify the name of The RBB Fund -- Money Market Portfolio (Bedford Class).
Subsequent purchases may be made by forwarding payment to the Fund's transfer
agent at the foregoing address.

Provided that the investment is at least $2,500, an investor may also purchase
Shares by having his bank or his broker wire Federal Funds to PNC Bank. An
investor's bank or broker may impose a charge for this service. In order to
ensure prompt receipt of an investor's Federal Funds wire, for an initial
investment, it is important that an investor follows these steps:

          A. Telephone the Fund's transfer agent, PFPC, toll-free (800) 447-1139
     and provide your name, address, telephone number, Social Security or Tax
     Identification Number, the Bedford Class selected, the amount being wired,
     and by which bank. PFPC will then provide an investor with a Fund account
     number. (Investors with existing accounts should also notify the Fund's
     transfer agent prior to wiring funds.)

          B. Instruct your bank or broker to wire the specified amount, together
     with your assigned account number, to PFPC's account with PNC Bank:

                PNC Bank, N.A.
                ABA-0310-0005-3.
                CREDIT ACCOUNT NUMBER: 86-1030-3398
                FROM: (name of investor)
                ACCOUNT NUMBER: (investor's account number with the Portfolio)
                FOR PURCHASE OF: (name of the Portfolio)
                AMOUNT: (amount to be invested)

          C. Complete and sign the Application and mail it to the address shown
     thereon. PFPC will not process initial purchases until it receives a
     completed and signed Application.

     For subsequent investments, an investor should follow steps A and B above.

RETIREMENT PLANS.

Shares may be purchased in conjunction with individual retirement accounts
("IRAs") and rollover IRAs where PFPC Trust Company acts as custodian. For
further information as to applications and annual fees, contact the Distributor
or your broker. To determine whether the benefits of an IRA are available and/or
appropriate, a shareholder should consult with a tax adviser.

REDEMPTION PROCEDURES

Redemption orders are effected at the net asset value per share next determined
after receipt of the order in proper form by the Fund's transfer agent, PFPC.
Investors may redeem all or some of their Shares in accordance with one of the
procedures described below.

REDEMPTION OF SHARES IN AN ACCOUNT.

An investor who beneficially owns Shares in an Account may redeem Shares in his
Account in accordance with instructions and limitations pertaining to his
Account by contacting his broker. If such notice is received by PFPC from the
broker by 12:00 noon Eastern Time on any Business Day, the redemption will be
effective as of 12:00 noon Eastern Time on that day. Payment of the redemption
proceeds will be made after 12:00 noon Eastern Time on the day the redemption is
effected, provided that the Fund's custodian is open for business. If the
custodian is not open, payment will be made on the next

                                       12

<PAGE>

bank business day. If the redemption request is received between 12:00 noon and
the close of regular trading on the NYSE on a Business Day, the redemption will
be effective as of the close of regular trading on the NYSE on such Business Day
and payment will be made on the next bank business day following receipt of the
redemption request. If all Shares are redeemed, all accrued but unpaid dividends
on those Shares will be paid with the redemption proceeds.

Each brokerage firm reserves the right to waive or modify criteria for
participation in an Account or to terminate participation in an Account for any
reason.

REDEMPTION OF SHARES OWNED DIRECTLY.

An investor may redeem any number of Shares by sending a written request to The
RBB Fund Money Market Portfolio (Bedford Class), c/o PFPC, P.O. Box 8960,
Wilmington, Delaware 19899. Redemption requests must be signed by each
shareholder in the same manner as the Shares are registered. Redemption requests
for joint accounts require the signature of each joint owner. On redemption
requests of $5,000 or more, a signature guarantee is required. A signature
guarantee may be obtained from a domestic bank or trust company, broker, dealer,
clearing agency or savings association who are participants in a medallion
program recognized by the Securities Transfer Association. The three recognized
medallion programs are Securities Transfer Agents Medallion Program (STAMP),
Stock Exchanges Medallion Program (SEMP) and New York Stock Exchange, Inc.
Medallion Signature Program (MSP). Signature guarantees that are not part of
these programs will not be accepted.

Investors may redeem or exchange shares without charge by telephone if they have
completed and returned an account application containing the appropriate
telephone election. To add a telephone option to an existing account that
previously did not provide for this option, a Telephone Authorization Form must
be filed with PFPC. This form is available from PFPC. Once this election has
been made, the shareholder may simply contact PFPC by telephone to request the
redemption by calling (888) 261-4073. Neither the Fund, the Portfolio, the
Distributor, PFPC nor any other Fund agent will be liable for any loss,
liability, cost or expense for following the procedures below or for following
instructions communicated by telephone that they reasonably believe to be
genuine.

The Fund's telephone transaction procedures include the following measures: (1)
requiring the appropriate telephone transaction privilege forms; (2) requiring
the caller to provide the names of the account owners, the account social
security number and name of the Portfolio, all of which must match the Fund's
records; (3) requiring the Fund's service representative to complete a telephone
transaction form, listing all of the above caller identification information;
(4) requiring that redemption proceeds be sent only by check to the account
owners of record at the address of record, or by wire only to the owners of
record at the bank account of record; (5) sending a written confirmation for
each telephone transaction to the owners of record at the address of record
within five (5) business days of the call; and (6) maintaining tapes of
telephone transactions for six months, if the Fund elects to record shareholder
telephone transactions. For accounts held of record by broker-dealers or other
industry professionals, additional documentation or information regarding the
scope of a caller's authority is required. Finally, for telephone transactions
in accounts held jointly, additional information regarding other account holders
is required. Telephone transactions will not be permitted in connection with IRA
or other retirement plan accounts or by an attorney-in-fact under power of
attorney.

Redemption proceeds of a telephone redemption request will be mailed by check to
an investor's registered address unless he has designated in his Application or
Telephone Authorization Form that such proceeds are to be sent by wire transfer
to a specified checking or savings account. If redemption proceeds are to be
sent by wire transfer, a telephone redemption request received prior to the
close of regular trading on the NYSE will result in redemption proceeds being
wired to the investor's bank account on the next bank business day. The minimum
redemption for proceeds sent by wire transfer is $2,500. There is no maximum for
proceeds sent by wire transfer. The Fund may modify this redemption service at
any time or charge a service fee upon prior notice to shareholders, although no
fee is currently contemplated.

REDEMPTION BY CHECK.

Upon request, the Fund will provide any direct investor and any investor who
does not have check writing privileges for his Account with forms of drafts
("checks") payable through PNC Bank. These checks may be made payable to the
order of anyone. The minimum amount of a check is $250; however, a broker may
establish a higher minimum. An investor wishing to use this check writing
redemption procedure should complete specimen signature cards (available from
PFPC), and then forward

                                       13

<PAGE>

such signature cards to PFPC. PFPC will then arrange for the checks to be
honored by PNC Bank. Investors who own shares through an Account should contact
their brokers for signature cards. Investors of joint accounts may elect to have
checks honored with a single signature. Check redemptions will be subject to PNC
Bank's rules governing checks. An investor will be able to stop payment on a
check redemption. The Fund or PNC Bank may terminate this redemption service at
any time, and neither shall incur any liability for honoring checks, for
effecting redemptions to pay checks, or for returning checks which have not been
accepted.

When a check is presented to PNC Bank for clearance, PNC Bank, as the investor's
agent, will cause the Fund to redeem a sufficient number of full and fractional
shares owned by the investor to cover the amount of the check. This procedure
enables the investor to continue to receive dividends on those Shares
representing the amount being redeemed by check until such time as the check is
presented to PNC Bank. Pursuant to rules under the 1940 Act, checks may not be
presented for cash payment at the offices of PNC Bank. This limitation does not
affect checks used for the payment of bills or cash at other banks.

Written redemption instructions, indicating the Portfolio from which shares are
to be redeemed, and duly endorsed stock certificates, if previously issued, must
be received by the transfer agent in proper form and signed exactly as the
shares are registered. All signatures must be guaranteed as described above
under "Redemption of Shares Owned Directly." Redemption requests by corporate
and fiduciary shareholders must be accompanied by appropriate documentation
establishing the authority of the person seeking to act on behalf of the
account. Investors may obtain from the Fund or the transfer agent forms of
resolutions and other documentation which have been prepared in advance to
assist compliance with the Portfolio's procedures.

During times of drastic economic or market conditions, investors may experience
difficulty in contacting Bear Stearns, the Distributor or the investor's broker
by telephone to request a redemption of Portfolio shares. In such cases,
investors should consider using the other redemption procedures described
herein. Use of these other redemption procedures may result in the redemption
request being processed at a later time than it would have been if telephone
redemption had been used.

AUTOMATIC WITHDRAWAL.

Automatic withdrawal permits investors to request withdrawal of a specified
dollar amount (minimum of $25) on either a monthly or quarterly basis if the
investor has a $5,000 minimum account. An application for automatic withdrawal
can be obtained from Bear Stearns, the Distributor, the investor's broker, or
the transfer agent. Automatic withdrawal may be ended at any time by the
investor, the Fund or the transfer agent. Shares for which certificates have
been issued may not be redeemed through automatic withdrawal. Purchases of
additional shares concurrently with withdrawals generally are undesirable.

ADDITIONAL REDEMPTION INFORMATION.

The Fund ordinarily will make payment for all Shares redeemed within seven days
after receipt by PFPC of a redemption request in proper form. Although the Fund
will redeem Shares purchased by check before the check clears, payment of the
redemption proceeds may be delayed for a period of up to fifteen days after
purchase, pending a determination that the check has cleared. This procedure
does not apply to Shares purchased by wire payment. Investors should consider
purchasing Shares using a certified or bank check or money order if they
anticipate an immediate need for redemption proceeds. During the period prior to
the time Shares are redeemed, dividends on such Shares will accrue and be
payable.

The Fund imposes no charge when Shares are redeemed, except as described below.
The Fund reserves the right to redeem any account in the Class involuntarily, on
30 days' notice, if such account falls below $500 and during such 30-day period
the amount invested in such account is not increased to at least $500. Payment
for Shares redeemed may be postponed or the right of redemption suspended as
provided by the rules of the Securities and Exchange Commission.

A shareholder may have redemption proceeds of $1 million or more wired to the
shareholder's brokerage account or a commercial bank account designated by the
shareholder. A transaction fee of $7.50 will be charged for payments by wire.
Questions about this option, or redemption requirements generally, should be
referred to the shareholder's Bear Stearns account executive, to the investor's
broker, or to the transfer agent if the shares are not held in a brokerage
account.

                                       14

<PAGE>

EXCHANGE OF SHARES

EXCHANGE PRIVILEGE.

The exchange privilege enables an investor to purchase shares of the Portfolio
in exchange for shares of the other mutual funds sponsored or advised by Bear
Stearns, to the extent such shares are offered for sale in the investor's state
of residence. These funds have different investment objectives than the Money
Market Portfolio. To use this privilege, investors should consult their account
executive at Bear Stearns, their investment dealers who have sales agreements
with Bear Stearns, the Distributor, the investor's broker or the Transfer Agent
to determine if it is available and whether any conditions are imposed on its
use. Currently, exchanges may be made among the following portfolios (and such
additional portfolios which may be added in the future):

           (ARROW) Emerging Markets Debt Portfolio
           (ARROW) S&P STARS Portfolio
           (ARROW) Large Cap Value Portfolio
           (ARROW) Small Cap Value Portfolio
           (ARROW) Total Return Bond Portfolio
           (ARROW) The Insiders Select Fund

To effect an exchange of Shares, exchange instructions must be given to the
transfer agent in writing or by telephone. A shareholder wishing to make an
exchange may do so by sending a written request to PFPC, Attention: The RBB
Fund--Money Market Portfolio (Bedford Class), P.O. Box 8960, Wilmington,
Delaware 19899. Shareholders are automatically provided with telephone exchange
privileges when opening an account, unless they indicate otherwise on the
account application. Shareholders holding share certificates are not eligible to
exchange shares of the Portfolio by phone because share certificates must
accompany all exchange requests. To add this feature to an existing account that
previously did not provide for this option, a Telephone Authorization Form must
be filed with the transfer agent. This form is available from the transfer
agent. Once this election has been made, the shareholder may contact the
Transfer Agent by telephone at (800) 447-1139 to request the exchange. See
"Redemption Procedures--Redemption of Shares Owned Directly" for a description
of the Fund's telephone transaction procedures. During periods of substantial
economic or market change, telephone exchanges may be difficult to complete and
shareholders may have to submit exchange requests to the transfer agent in
writing.

If the exchanging shareholder does not currently own shares of the Portfolio or
fund whose shares are being acquired, a new account will be established with the
same registration, dividend and capital gain options and the same dealer of
record as the account from which shares are exchanged, unless otherwise
specified in writing by the shareholder with all signatures guaranteed as
described above. To participate in the Systematic Investment Plan or establish
automatic withdrawal for the new account, however, an exchanging shareholder
must file a specific written request. The exchange privilege may be modified or
terminated at any time, or from time to time, by the Fund on 60 days' notice to
affected portfolio or fund shareholders.

Before any exchange, the investor must obtain and should review a copy of the
current prospectus of the portfolio or fund into which the exchange is being
made. Prospectuses may be obtained from Bear Stearns. Except in the case of
Personal Retirement Plans, the Shares being exchanged must have a current value
of at least $250; furthermore, when establishing a new account by exchange, the
shares being exchanged must have a value of at least the minimum initial
investment required for the portfolio or fund into which the exchange is being
made. If making an exchange to an existing account, the dollar value must equal
or exceed the applicable minimum for subsequent investments. If any amount
remains in the investment portfolio from which the exchange is being made, such
amount must not be below the minimum account value required by the portfolio or
fund.

Shares will be exchanged at the next determined public offering price. To
qualify for the exchange privilege, at the time of the exchange, the investor
must notify Bear Stearns, the Distributor, his investment dealer or the transfer
agent. Any such qualification is subject to confirmation of the investor's
holdings through a check of appropriate records. No fees currently are charged
shareholders directly in connection with exchanges, although the Fund reserves
the right, upon not less than 60 days' written notice, to charge shareholders a
$5.00 fee in accordance with rules promulgated by the Securities

                                       15

<PAGE>

and Exchange Commission. The Fund reserves the right to reject any exchange
request in whole or in part. The Exchange Privilege may be modified or
terminated at any time upon notice to shareholders.

The exchange of shares of one portfolio or fund for shares of another is treated
for federal income tax purposes as a sale of the shares given in exchange by the
shareholder and, therefore, an exchanging shareholder may realize a taxable gain
or loss.

REDIRECTED DISTRIBUTION OPTION.

The Redirected Distribution Option enables a shareholder to invest automatically
dividends or dividends and capital gain distributions, if any, paid by the
Portfolio in shares of another portfolio of the Fund or a fund advised or
sponsored by Bear Stearns of which the shareholder is an investor. Shares of the
other portfolio or fund will be purchased at the then current public offering
price; however, a sales load may be charged with respect to investments in
shares of a portfolio or fund sold with a sales load. If the shareholder is
investing in a fund that charges a sales load, such shareholder may qualify for
share prices which do not include the sales load or which reflect a reduced
sales load.

This privilege is available only for existing accounts and may not be used to
open new accounts. Minimum subsequent investments do not apply. The Fund may
modify or terminate this privilege at any time or charge a service fee. No such
fee currently is contemplated.

                                 Net Asset Value

The net asset value per share of each class of the Portfolio for the purpose of
pricing purchase and redemption orders is determined twice each day, once as of
12:00 noon Eastern Time and once as of the close of regular trading on the NYSE
on each weekday with the exception of those holidays on which either the NYSE or
the FRB is closed. Currently, the NYSE is closed on weekends and the customary
national business holidays of New Year's Day, Dr. Martin Luther King, Jr. Day,
Presidents' Day, Good Friday, Memorial Day, Independence Day, Labor Day,
Thanksgiving Day and Christmas Day and on the preceding Friday or subsequent
Monday when one of these holidays falls on a Saturday or Sunday. The FRB is
currently closed on weekends and the same holidays as the NYSE is closed as well
as Veterans' Day and Columbus Day. The net asset value for each class of the
Fund is calculated by adding the value of the proportionate interest of the
class in the securities, cash and other assets of the Portfolio, deducting the
actual and accrued liabilities of such class and dividing the result by the
number of outstanding shares of the class. The net asset value per share of each
class of a portfolio is determined independently of any of the Fund's other
classes.

The Fund seeks to maintain for the Portfolio a net asset value of $1.00 per
share for purposes of purchases and redemptions and values its portfolio
securities on the basis of the amortized cost method of valuation described in
the Statement of Additional Information under the heading "Valuation of Shares."
There can be no assurance that net asset value per share will not vary.

With the approval of the Board of Directors, the Portfolio may use a pricing
service, bank or broker dealer experienced in such matters to value the
Portfolio's securities. A more detailed discussion of net asset value and
security valuation is contained in the Statement of Additional Information.

                                   Management

BOARD OF DIRECTORS

The business and affairs of the Fund and each investment portfolio are managed
under the direction of the Fund's Board of Directors. The Fund currently
operates or proposes to operate seventeen separate investment portfolios. The
Class represents interests in the Fund's Money Market Portfolio.

                                       16

<PAGE>

INVESTMENT ADVISER

BIMC, an indirect majority-owned subsidiary of PNC Bank, serves as the
investment adviser for the Portfolio. BIMC has its principal offices at Bellevue
Park Corporate Center, 400 Bellevue Parkway, Wilmington, Delaware 19809. PNC
Bank and its subsidiaries currently manage over $45.9 billion of assets, of
which approximately $31.4 billion are mutual funds. PNC Bank, a national bank
whose principal business address is 1600 Market Street, Philadelphia,
Pennsylvania 19103, is a wholly-owned subsidiary of PNC Bancorp, Inc. PNC
Bancorp, Inc. is a bank holding company and a wholly-owned subsidiary of PNC
Bank Corp., a multi-bank holding company.

As investment adviser to the Portfolio, BIMC manages such Portfolio and is
responsible for all purchases and sales of portfolio securities. In entering
into Portfolio transactions for the Portfolio with a broker, BIMC may take into
account the sale by such broker of shares of the Fund, subject to the
requirements of best execution. The agreement between BIMC and RBB with respect
to the Money Market Portfolio provides for BIMC to also assist generally in
supervising the operations of such Portfolio, and to maintain the Portfolio's
financial accounts and records. These administrative responsibilities have been
delegated to PFPC, as described below.

For the services provided to and expenses assumed by it for the benefit of the
Money Market Portfolio, BIMC is entitled to receive the following fees, computed
daily and payable monthly based on a Portfolio's average daily net assets: .45%
of the first $250 million; .40% of the next $250 million; and .35% of net assets
in excess of $500 million.

BIMC may in its discretion from time to time agree to waive voluntarily all or
any portion of its advisory fee for the Portfolio.

For the Fund's fiscal year ended August 31, 1998, the Fund paid investment
advisory fees aggregating .23% of the average daily net assets of the Money
Market Portfolio. For that same year, BIMC waived approximately .13% of the
average daily net assets of the Money Market Portfolio.

PNC Bank was formerly sub-adviser to the Portfolio and provided research, credit
analysis and recommendations with respect to the Portfolio's investments and
supplied certain computer facilities, personnel and other services. The
facilities, personnel, services and related expenses have been transferred to
BIMC and in return, BIMC's obligation to pay a portion of the sub-advisory fee
to PNC Bank has been terminated. For its sub-advisory services, PNC Bank was
entitled to receive from BIMC an amount equal to 75% of the investment advisory
fee paid by the Portfolio to BIMC (subject to adjustment in certain
circumstances). The sub-advisory fees paid by BIMC to PNC Bank had no effect on
the investment advisory fees payable by the Fund to BIMC. The services provided
by BIMC and the fees payable by the Fund for these services are described
further in the Statement of Additional Information under "Management of the
Company."

ADMINISTRATOR
Pursuant to its advisory agreement with the Fund with respect to the Money
Market Portfolio, BIMC provides administrative services to such Portfolio, and
is entitled to receive an administration fee, computed daily and payable monthly
at a rate of .10% of the average daily net assets of the Portfolio. BIMC has
delegated to PFPC all of its accounting and administrative obligations under
such agreement. The Fund has agreed to pay directly to PFPC the fees for
accounting and administrative services which PFPC would have received directly
from BIMC. Such arrangement has no effect on the total advisory and
administrative fees payable by such Portfolio to BIMC. PFPC's principal business
address is 400 Bellevue Parkway, Wilmington, Delaware 19809.

TRANSFER AGENT, DIVIDEND DISBURSING AGENT AND CUSTODIAN
PFPC Trust Company, an indirect wholly owned subsidiary of PNCBank Corp., serves
as the Fund's custodian and PFPC, an indirect wholly-owned subsidiary of PNC
Bank Corp., serves as the Fund's transfer agent and dividend disbursing agent.
PFPC may enter into shareholder servicing agreements with registered
broker/dealers who have entered into dealer agreements with the Distributor for
the provision of certain shareholder support services to customers of such
broker/dealers who are shareholders of the Portfolio. The services provided and
the fees payable by the Fund for these services are described in the Statement
of Additional Information under "Investment Advisory, Distribution and Servicing
Arrangements."

                                       17

<PAGE>

DISTRIBUTOR
Provident Distributors, Inc., with a principal business address at Four Falls
Corporate Center, West Conshohocken, Pennsylvania 19428, acts as Distributor of
the Fund pursuant to a distribution agreement dated May 29, 1998 (the
"Distribution Agreement").

EXPENSES
The expenses of each Portfolio are deducted from the total income of such
Portfolio before dividends are paid. Any general expenses of the Fund that are
not readily identifiable as belonging to a particular investment portfolio of
the Fund will be allocated among all investment portfolios of the Fund based on
the relative net assets of the investment portfolios at the time such expenses
were accrued. The Bedford Class of the Fund pays its own distribution fees, and
may pay a different share than other classes of the Fund of other expenses
(excluding advisory and custodial fees) if these expenses are actually incurred
in a different amount by the Bedford Class or if it receives different services.

The investment adviser may assume expenses of the Portfolio from time to time.
In certain circumstances, it may assume such expenses on the condition that it
is reimbursed by the Portfolio for such amounts prior to the end of a fiscal
year. In such event, the reimbursement of such amounts will have the effect of
lowering a Portfolio's expense ratio and of increasing yield to investors.

For the Fund's fiscal year ended August 31, 1998, the Fund's total expenses were
1.10% of the average daily net assets with respect to the Class of the Money
Market Portfolio (not taking into account waivers and reimbursements of .13%).

                             Distribution of Shares

The Board of Directors of the Fund approved and adopted the Distribution
Agreement and separate Plan of Distribution for the Class (the "Plan") pursuant
to Rule 12b-1 under the 1940 Act. Under the Plan, the Distributor is entitled to
receive from the Class a distribution fee, which is accrued daily and paid
monthly, of up to .65% on an annualized basis of the average daily net assets of
the Class. Under the Distribution Agreement, the Distributor has agreed to
accept compensation for its services thereunder and under the Plan in the amount
of .60% of the average daily net assets of the Class on an annualized basis in
any year. The actual amount of such compensation is agreed upon from time to
time by the Fund's Board of Directors and the Distributor. Pursuant to the
conditions of an exemptive order granted by the Securities and Exchange
Commission, the Distributor has agreed to waive its fee with respect to the
Class on any day to the extent necessary to assure that the fee required to be
accrued by the Class does not exceed the income of the Class on that day. In
addition, the Distributor may, in its discretion, voluntarily waive from time to
time all or any portion of its distribution fee. 

Under the Distribution Agreement and the Plan, the Distributor may reallocate an
amount up to the full fee that it receives to financial institutions, including
Dealers, based upon the aggregate investment amounts maintained by and services
provided to shareholders of the Class serviced by such financial institutions.
The Distributor may also reimburse Dealers for other expenses incurred in the
promotion of the sale of Fund shares. The Distributor and/or Dealers pay for the
cost of printing (excluding typesetting) and mailing to prospective investors
prospectuses and other materials relating to the Fund as well as for related
direct mail, advertising and promotional expenses.

The Plan obligates the Fund, during the period it is in effect, to accrue and
pay to the Distributor on behalf of the Class the fee agreed to under the
Distribution Agreement. Payments under the Plan are not based on expenses
actually incurred by the Distributor, and the payments may exceed distribution
expenses actually incurred.

                                       18

<PAGE>

                           Dividends and Distributions

The Fund will distribute substantially all of the net investment income and net
realized capital gains, if any, of the Portfolio to the Portfolio's
shareholders. All distributions are reinvested in the form of additional full
and fractional Shares of the Class unless a shareholder elects otherwise.

The net investment income (not including any net short-term capital gains)
earned by the Portfolio will be declared as a dividend on a daily basis and paid
monthly. Dividends are payable to shareholders of record immediately prior to
the determination of net asset value made as of the close of regular trading on
the NYSE. Net short-term capital gains, if any, will be distributed at least
annually.

                                      Taxes

Distributions from the Money Market Portfolio will generally be taxable to
shareholders. It is expected that all, or substantially all, of these
distributions will consist of ordinary income. You will be subject to income tax
on these distributions regardless whether they are paid in cash or reinvested in
additional shares. The one major exception to these tax principles is that
distributions on shares held in an IRA (or other tax-qualified plan) will not be
currently taxable.

The foregoing is only a summary of certain tax considerations under the current
law, which may be subject to change in the future. You should consult your tax
adviser for further information regarding federal, state, local and/or foreign
tax consequences relevant to your specific situation.

                              Description of Shares

The Fund has authorized capital of thirty billion shares of Common Stock, $.001
par value per share, of which 18.326 billion shares are currently classified
into 97 different classes of Common Stock ( see "Description of Shares" in the
Statement of Additional Information).

The Fund offers multiple classes of shares in the Money Market Portfolio to
expand its marketing alternatives and to broaden its range of services to
different investors. The expenses of the various classes within these Portfolios
vary based upon the services provided, which may affect performance. Each class
of Common Stock of the Fund has a separate Rule 12b-1 distribution plan. Under
the Distribution Agreements entered into with the Distributor and pursuant to
each of the distribution plans, the Distributor is entitled to receive from each
class as compensation for distribution services provided to that class a
distribution fee based on average daily net assets. A salesperson or any other
person entitled to receive compensation for servicing Fund shares may receive
different compensation with respect to different classes in a Portfolio of the
Fund. An investor may contact the Fund's Distributor by calling 1-800-888-9723
to request more information concerning other classes available.

THIS PROSPECTUS AND THE STATEMENT OF ADDITIONAL INFORMATION INCORPORATED HEREIN
RELATE PRIMARILY TO THE BEDFORD SHARES OF THE MONEY MARKET PORTFOLIO AND
DESCRIBE ONLY THE INVESTMENT OBJECTIVE AND POLICIES, OPERATIONS, CONTRACTS AND
OTHER MATTERS RELATING TO THE BEDFORD SHARES OF THE MONEY MARKET PORTFOLIO.

Each share that represents an interest in a Portfolio has an equal proportionate
interest in the assets belonging to such Portfolio with each other share that
represents an interest in such Portfolio, even where a share has a different
class designation than another share representing an interest in that Portfolio.
Shares of the Fund do not have preemptive or conversion rights. When issued for
payment as described in this Prospectus, Shares of the Fund will be fully paid
and non-assessable.

The Fund currently does not intend to hold annual meetings of shareholders
except as required by the 1940 Act or other applicable law. The law under
certain circumstances provides shareholders with the right to call for a meeting
of shareholders to consider the removal of one or more directors. To the extent
required by law, the Fund will assist in shareholder communication in such
matters.

                                       19

<PAGE>

Holders of shares of the Portfolio will vote in the aggregate and not by class
on all matters, except where otherwise required by law. Further, shareholders of
all investment portfolios of the Fund will vote in the aggregate and not by
portfolio except as otherwise required by law or when the Board of Directors
determines that the matter to be voted upon affects only the interests of the
shareholders of a particular investment portfolio. (See the Statement of
Additional Information under "Additional Information Concerning Fund Shares" for
examples of when the 1940 Act requires voting by investment portfolio or by
class.) Shareholders of the Fund are entitled to one vote for each full share
held (irrespective of class or portfolio) and fractional votes for fractional
shares held. Voting rights are not cumulative and, accordingly, the holders of
more than 50% of the aggregate shares of Common Stock of the Fund may elect all
of the directors.

As of November 16, 1998, to the Fund's knowledge, no person held of record or
beneficially 25% or more of the outstanding shares of all classes of the Fund.

                                Other Information

REPORTS AND INQUIRIES

Shareholders will receive unaudited semi-annual reports describing the Fund's
investment operations and annual financial statements audited by independent
accountants. Shareholder inquiries should be addressed to PFPC, the Fund's
transfer agent, Bellevue Park Corporate Center, 400 Bellevue Parkway,
Wilmington, Delaware 19809, toll-free (800) 447-1139.

                                       26

<PAGE>

  The
Bear Stearns
  Funds

235 PARK AVENUE
NEW YORK, NY 10167
1-800-766-4111


MONEY MARKET PORTFOLIO

INVESTMENT ADVISER
BlackRock Institutional Management Corporation
Wilmington, Delaware

DISTRIBUTOR
Provident Distributors, Inc.
West Conshohocken, Pennsylvania

CUSTODIAN
PFPC Trust Company
Wilmington, Delaware

ADMINISTRATOR AND TRANSFER AGENT
PFPC Inc.
Wilmington, Delaware

COUNSEL
Drinker Biddle & Reath LLP
Philadelphia, Pennsylvania

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers LLP
Philadelphia, Pennsylvania


NO  PERSON  HAS  BEEN  AUTHORIZED  TO  GIVE  ANY  INFORMATION  OR  TO  MAKE  ANY
REPRESENTATIONS  NOT CONTAINED IN THIS PROSPECTUS OR IN THE FUND'S  STATEMENT OF
ADDITIONAL INFORMATION  INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE
OFFERING MADE BY THIS  PROSPECTUS  AND, IF GIVEN OR MADE,  SUCH  INFORMATION  OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE FUND OR
ITS DISTRIBUTOR.  THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY THE FUND OR
BY THE  DISTRIBUTOR IN ANY  JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY
BE MADE.

BSF-P-004-02

<PAGE>
================================================================================

                                     BEDFORD
                                    MUNICIPAL
                                  MONEY MARKET
                                    PORTFOLIO

                                   Prospectus


                                December 29, 1998

<PAGE>

                                     BEDFORD
                        MUNICIPAL MONEY MARKET PORTFOLIO
                                       OF
                               THE RBB FUND, INC.

     The Bedford Shares of the Municipal Money Market  Portfolio (THE "MUNICIPAL
MONEY  MARKET  PORTFOLIO"  OR THE  "PORTFOLIO")  are a class of shares of common
stock of The RBB Fund,  Inc. (the  "Fund"),  an open-end  management  investment
company.  Shares of the class offered by this Prospectus  represent interests in
the Portfolio.

     The  investment  objective of the  Municipal  Money Market  Portfolio is to
provide as high a level of current  interest  income exempt from federal  income
taxes as is consistent  with  maintaining  liquidity and stability of principal.
The  Municipal  Money  Market  Portfolio  seeks to  achieve  such  objective  by
investing  substantially  all  of  its  assets  in a  diversified  portfolio  of
short-term Municipal Obligations. "Municipal Obligations" are obligations issued
by or on behalf of states, territories and possessions of the United States, the
District   of   Columbia   and   their   political    subdivisions,    agencies,
instrumentalities  and authorities.  During periods of normal market conditions,
at least 80% of the net assets of the  Portfolio  will be invested in  Municipal
Obligations, the interest on which is exempt from the regular federal income tax
but which may  constitute an item of tax  preference for purposes of the federal
alternative minimum tax.

     SHARES OF THE FUND ARE NOT DEPOSITS OR  OBLIGATIONS  OF, OR  GUARANTEED  OR
ENDORSED BY PNC BANK, NATIONAL ASSOCIATION, PFPC TRUST COMPANY OR ANY OTHER BANK
AND  SHARES  ARE  NOT  FEDERALLY   INSURED  BY  THE  FEDERAL  DEPOSIT  INSURANCE
CORPORATION,  THE FEDERAL  RESERVE  BOARD,  OR ANY OTHER  AGENCY.  INVESTMENT IN
SHARES OF THE FUND INVOLVE  INVESTMENT  RISKS,  INCLUDING  THE POSSIBLE  LOSS OF
PRINCIPAL. THERE CAN BE NO ASSURANCE THAT THE PORTFOLIO WILL BE ABLE TO MAINTAIN
A STABLE NET ASSET VALUE OF $1.00 PER SHARE.

     BlackRock Institutional Management Corporation serves as investment adviser
for the Portfolio.  PFPC Trust Company serves as custodian for the Fund and PFPC
Inc.  serves as  administrator  of the  Portfolio  and the transfer and dividend
disbursing agent for the Fund. Provident Distributors,  Inc. acts as distributor
for the Fund.

     This Prospectus  contains concise  information that a prospective  investor
needs to know before investing. Please keep it for future reference. A Statement
of  Additional  Information,  dated  December 29, 1998,  has been filed with the
Securities  and Exchange  Commission  and is  incorporated  by reference in this
Prospectus.  It may be  obtained  upon  request  free of charge from the Fund by
calling (800) 430-9618.  The Prospectus and Statement of Additional  Information
are also available for reference, along with other related materials, on the SEC
Internet Website (http://www.sec.gov).

- --------------------------------------------------------------------------------
THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THIS
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------

PROSPECTUS                                                     December 29, 1998

<PAGE>

INTRODUCTION
- --------------------------------------------------------------------------------
     The  RBB  Fund,  Inc.  is  an  open-end   management   investment   company
incorporated  under the laws of the State of Maryland on February 29, 1988.  The
Fund  is  currently   operating  or  proposing  to  operate  seventeen  separate
investment portfolios.  The shares ("Shares") of the Bedford Class (the "Class")
of common stock of the Fund offered by this  Prospectus  represent  interests in
the Fund's Municipal Money Market Portfolio.

     The  investment  objective of the  Municipal  Money Market  Portfolio is to
provide as high a level of current  interest  income exempt from federal  income
taxes as is consistent with maintaining liquidity and stability of principal. To
achieve  this   objective,   the  Municipal  Money  Market   Portfolio   invests
substantially  all  of its  assets  in a  diversified  portfolio  of  short-term
Municipal  Obligations  which meet certain ratings  criteria and present minimal
credit risks to the Portfolio.  During periods of normal market  conditions,  at
least 80% of the net  assets of the  Portfolio  will be  invested  in  Municipal
Obligations,  the  interest on which is exempt from the regular  federal  income
tax,  but which may  constitute  an item of tax  preference  for purposes of the
federal alternative minimum tax.

     The  Portfolio  seeks to  maintain  a net asset  value of $1.00 per  share;
however, there can be no assurance that the Portfolio will be able to maintain a
stable net asset value of $1.00 per share.

     The Portfolio's  investment adviser is BlackRock  Institutional  Management
Corporation  ("BIMC").  PFPC Trust  Company  serves as custodian to the Fund and
PFPC Inc. ("PFPC") serves as the administrator to the Portfolio and transfer and
dividend  disbursing  agent  to the  Fund.  Provident  Distributors,  Inc.  (the
"Distributor") acts as distributor of the Fund's Shares.

     An investor may purchase and redeem Shares  through his broker or by direct
purchases or redemptions. See "Purchase and Redemption of Shares."

     An investment in the Portfolio is subject to certain risks, as set forth in
detail under "Investment Objectives and Policies." The Portfolio,  to the extent
set forth under "Investment Objectives and Policies," may engage in the purchase
of securities on a "when-issued" or "forward commitment" basis, and the purchase
of stand-by  commitments.  These transactions  involve certain special risks, as
set forth under "Investment Objective and Policies."

FEE TABLE
     The Fee Table below contains a summary of the annual operating  expenses of
the Bedford  Class of the  Municipal  Money Market  Portfolio  based on expenses
incurred for the fiscal year ended August 31, 1998,  as a percentage  of average
daily net assets.  An example  based on the  summary is also shown.  

ANNUAL FUND OPERATING EXPENSES (BEDFORD CLASS)
     AS A PERCENTAGE OF AVERAGE DAILY NET ASSETS
Management Fees (after waivers)(1) .......................................  .08%
12b-1 fees(1) ............................................................  .58%
Other Expenses(1) ........................................................  .23%
                                                                            ---
Total Fund Operating Expenses (Bedford Class) (after waivers
     and reimbursements)(1) ..............................................  .89%
                                                                            ===
(1) Management Fees and 12b-1 Fees are based on average daily net assets and are
    calculated daily and paid monthly.  Before waivers for the Bedford Municipal
    Money  Market  Portfolio,  Management  Fees  would be .34%,  and Total  Fund
    Operating Expenses would be 1.15%.

EXAMPLE 

An investor would pay the following  expenses on a $1,000  investment,  assuming
(1) 5% annual return and (2) redemption at the end of each time period:

                                     1 YEAR     3 YEARS     5 YEARS    10 YEARS
                                     ------     -------     -------    --------
Municipal Money Market Portfolio* ..   $9         $28         $49        $110
* Other Classes of this Portfolio are sold with different fees and expenses.

                                       2

<PAGE>

     The Example in the Fee Table assumes that all  dividends and  distributions
are  reinvested  and  that the  amounts  listed  under  "Annual  Fund  Operating
Expenses"  remain  the  same in the  years  shown.  THE  EXAMPLE  SHOULD  NOT BE
CONSIDERED A  REPRESENTATION  OF PAST OR FUTURE EXPENSES AND ACTUAL EXPENSES MAY
BE GREATER OR LESS THAN THOSE SHOWN.  Long-term  Shareholders  may pay more than
the economic  equivalent of the maximum front-end sales charges permitted by the
National Association of Securities Dealers, Inc.

     The Fee Table is  designed  to  assist an  investor  in  understanding  the
various  costs  and  expenses  that an  investor  in the  Bedford  Class  of the
Portfolio will bear directly or indirectly.  (For more complete  descriptions of
the various  costs and expenses,  see  "Management  -- Investment  Adviser," and
"Distribution  of Shares"  below.) Expense figures are based on actual costs and
fees  charged  to the  Class.  The Fee  Table  reflects  a  voluntary  waiver of
Management  Fees for the  Class.  However,  there can be no  assurance  that any
future  waivers of Management  Fees will not vary from the figures  reflected in
the Fee Table.  To the  extent  that any  service  providers  assume  additional
expenses of the Portfolio,  such assumption will have the effect of lowering the
Portfolio's overall expense ratio and increasing its yield to investors.

     From time to time the Class  advertises  its "total  return,"  "yield"  and
"effective  yield."  Total  return  and yield  figures  are based on  historical
earnings and are not intended to indicate future performance. The "yield" of the
Class  refers to the  income  generated  by an  investment  in the Class  over a
seven-day period (which period will be stated in the advertisement). This income
is then  "annualized." That is, the amount of income generated by the investment
during that week is assumed to be generated  each week over a 52-week period and
is shown as a percentage of the investment.  The "effective yield" is calculated
similarly but, when annualized,  the income earned by an investment in the Class
is assumed to be reinvested.  The "effective yield" will be slightly higher than
the "yield" because of the compounding effect of this assumed reinvestment.  The
"tax-equivalent  yield" of the Class may also be quoted from time to time, which
shows the level of taxable  yield needed to produce an after-tax  equivalent  to
the tax-free  yield of the Class.  This is done by  increasing  the yield of the
Class  (calculated  as above) by the amount  necessary to reflect the payment of
federal income tax at a stated tax rate.

     The total  return and yield of any  investment  is  generally a function of
portfolio quality and maturity,  type of investment and operating expenses.  The
total  return  and  yield  on  Shares  will  fluctuate  and is  not  necessarily
representative of future results. Any fees charged by broker/dealers directly to
their shareholders in connection with investments in the Class are not reflected
in the total  return and yield of the Shares,  and such fees,  if charged,  will
reduce the actual return  received by  shareholders  on their  investments.  The
total  return and yield on Shares of the Class may differ from the total  return
and yields on shares of other classes of the Fund that also represent  interests
in the  Portfolio  depending on the  allocation of expenses to each class of the
Portfolio. See "Expenses."

FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
     The table below sets forth certain  information  concerning  the investment
results of the Bedford  Class of the  Municipal  Money Market  Portfolio for the
periods  indicated.  The  financial  data included in this table for each of the
periods ended August 31, 1994 through  August 31, 1998, are a part of the Fund's
financial  statements for the Portfolio which are incorporated by reference into
the   Statement   of   Additional   Information   and  have  been   audited   by
PricewaterhouseCoopers  LLP  ("PricewaterhouseCoopers"),  the Fund's independent
accountants.  The financial  data for the Portfolio for the periods ended August
31, 1989, 1990, 1991, 1992 and 1993 are a part of previous financial  statements
audited by  PricewaterhouseCoopers.  The  financial  data  included in the table
should be read in conjunction  with the financial  statements and notes thereto.
Further  information  about the performance of the Portfolio is available in the
Annual Report to Shareholders. Both the Statement of Additional Information, and
the Annual Report to Shareholders  may be obtained free of charge by calling the
telephone number on page 1 of this Prospectus.

                                       3

<PAGE>

                               THE BEDFORD FAMILY

THE RBB FUND, INC. FINANCIAL HIGHLIGHTS (c)
     FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD

<TABLE>
<CAPTION>
                                                                 MUNICIPAL MONEY MARKET PORTFOLIO                                
                            -----------------------------------------------------------------------------------------------------
                                                                                                                                 
                                                                                                                                 
                                                                                                                                 
                              FOR THE      FOR THE     FOR THE      FOR THE      FOR THE      FOR THE      FOR THE      FOR THE  
                            YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED
                            AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,
                               1998         1997         1996         1995         1994         1993         1992         1991   
                            ----------   ----------   ----------   ----------   ----------   ----------   ----------   ----------
<S>                          <C>          <C>          <C>          <C>          <C>          <C>          <C>          <C>      
Net asset value,
   beginning of period ..... $   1.00     $   1.00     $   1.00     $   1.00     $   1.00     $   1.00     $   1.00     $   1.00 
                             --------     --------     --------     --------     --------     --------     --------     -------- 
Income from investment
   operations:
   Net investment income ...   0.0286       0.0285       0.0288       0.0297       0.0195       0.0195       0.0287       0.0431 
   Net gains on securities
     (both realized
     and unrealized) .......       --           --           --           --           --           --           --           -- 
                             --------     --------     --------     --------     --------     --------     --------     -------- 
       Total from
         investment
         operations ........   0.0286       0.0285       0.0288       0.0297       0.0195       0.0195       0.0287       0.0431 
                             --------     --------     --------     --------     --------     --------     --------     -------- 
Less distributions
   Dividends (from net
     investment income) ....  (0.0286)     (0.0285)     (0.0288)     (0.0297)     (0.0195)     (0.0195)     (0.0287)     (0.0431)
   Distributions (from
     capital gains) ........       --           --           --           --           --           --           --           -- 
                             --------     --------     --------     --------     --------     --------     --------     -------- 
       Total distributions .  (0.0286)     (0.0285)     (0.0288)     (0.0297)     (0.0195)     (0.0195)     (0.0287)     (0.0431)
                             --------     --------     --------     --------     --------     --------     --------     -------- 
Net asset value,
    end of period .......... $   1.00     $   1.00     $   1.00     $   1.00     $   1.00     $   1.00     $   1.00     $   1.00 
                             ========     ========     ========     ========     ========     ========     ========     ======== 
Total Return ...............    2.97%        2.88%        2.92%        3.01%        1.97%        1.96%        2.90%        4.40% 
Ratios/Supplemental Data
   Net assets, end of
     period (000) .......... $147,633     $213,034     $201,940     $198,425     $182,480     $215,577     $176,950     $215,140 
   Ratios of expenses to
     average net assets ....   .89%(a)      .85%(a)      .84%(a)      .82%(a)      .77%(a)      .77%(a)      .77%(a)      .74%(a)
   Ratios of net investment
     income to average
     net assets ............    2.86%        2.85%        2.88%        2.97%        1.95%        1.95%        2.87%        4.31% 
</TABLE>

<TABLE>
<CAPTION>
                            MUNICIPAL MONEY MARKET PORTFOLIO
                            --------------------------------
                                           FOR THE PERIOD
                                         SEPTEMBER 30, 1988
                             FOR THE        (COMMENCEMENT 
                            YEAR ENDED    OF OPERATIONS) TO
                            AUGUST 31,        AUGUST 31,
                               1990             1989
                            ----------    -----------------
<S>                          <C>              <C>
Net asset value,                         
   beginning of period ..... $   1.00         $   1.00
                             --------         --------
Income from investment                   
   operations:                           
   Net investment income ...   0.0522           0.0513
   Net gains on securities               
     (both realized                      
     and unrealized) .......       --               --
                             --------         --------
       Total from                        
         investment                      
         operations ........   0.0522           0.0513
                             --------         --------
Less distributions                       
   Dividends (from net                   
     investment income) ....  (0.0522)         (0.0513)
   Distributions (from                   
     capital gains) ........       --               --
                             --------         --------
       Total distributions .  (0.0522)         (0.0513)
                             --------         --------
Net asset value,                         
    end of period .......... $   1.00         $   1.00
                             ========         ========
Total Return ...............    5.35%            5.72%
Ratios/Supplemental Data                 
   Net assets, end of                    
     period (000) .......... $195,566         $ 85,806
   Ratios of expenses to                 
     average net assets ....   .75%(a)       .73%(a)(b)
   Ratios of net investment              
     income to average                   
     net assets ............    5.22%            5.70%
                                        
<FN>
(a) Without  the waiver of advisory  and  administration  fees,  and without the
    reimbursement  of certain  operating  expenses,  the ratios of  expenses  to
    average net assets for the Municipal Money Market  Portfolio would have been
    1.15%,  1.14%,  1.12%,  1.14%,  1.12%, 1.16%, 1.15%, 1.13% and 1.14% for the
    years ended August 31, 1998,  1997,  1996,  1995, 1994, 1993, 1992, 1991 and
    1990,  respectively,  and 1.27%  annualized  for the period ended August 31,
    1989.

(b) Annualized.

(c) Financial Highlights relate solely to the Bedford Class of Shares within the
    Portfolio.
</FN>
</TABLE>

                                       4

<PAGE>

INVESTMENT OBJECTIVES AND POLICIES
- --------------------------------------------------------------------------------
     The Municipal Money Market Portfolio's  investment  objective is to provide
as high a level of current  interest  income exempt from federal income taxes as
is  consistent  with  maintaining  liquidity  and  stability of  principal.  The
Municipal Money Market Portfolio  invests  substantially  all of its assets in a
diversified  portfolio  of  short-term  Municipal  Obligations,  the interest on
which, in the opinion of bond counsel or counsel to the issuer,  as the case may
be, is exempt from the regular federal income tax and which meet certain ratings
criteria and present  minimal credit risks.  See "Eligible  Securities".  During
periods  of normal  market  conditions,  at least  80% of the net  assets of the
Municipal  Money Market  Portfolio  will be invested in  Municipal  Obligations.
Municipal  Obligations include securities,  the interest on which is exempt from
the regular federal income tax and is not an item of tax preference for purposes
of the federal alternative minimum tax ("Tax-Exempt Interest"),  although to the
extent the  Portfolio  invests in certain  private  activity  bonds issued after
August 7, 1986 ("Alternative Minimum Tax Securities"), a portion of the interest
earned by the Portfolio may constitute an item of tax preference for purposes of
the federal alternative minimum tax ("AMT Interest"). There is no assurance that
the investment objective of the Portfolio will be achieved.

     MUNICIPAL  OBLIGATIONS.  The  Portfolio  invests  in  short-term  Municipal
Obligations  which are  determined  by the  Portfolio's  investment  adviser  to
present minimal credit risks and that meet certain ratings criteria  pursuant to
guidelines established by the Fund's Board of Directors.  The Portfolio may also
purchase  securities that are unrated at the time of purchase provided that such
securities  are  determined  to be  of  comparable  quality  to  eligible  rated
securities.  The applicable  Municipal  Obligations ratings are described in the
Appendix to the Statement of Additional Information.

     The Portfolio may hold uninvested cash reserves pending  investment  during
temporary defensive periods or if, in the opinion of the Portfolio's  investment
adviser,  suitable  obligations  bearing Tax-Exempt Interest or AMT Interest are
unavailable. There is no percentage limitation on the amount of assets which may
be held uninvested during temporary defensive periods.  Uninvested cash reserves
will not earn income.

     The two principal  classifications  of Municipal  Obligations  are "general
obligation"  securities and "revenue" securities.  General obligation securities
are secured by the  issuer's  pledge of its full faith,  credit and taxing power
for the payment of principal and interest.  Revenue  securities are payable only
from the revenues derived from a particular  facility or class of facilities or,
in some  cases,  from the  proceeds  of a special  excise tax or other  specific
excise tax or other  specific  revenue  source such as the user of the  facility
being financed.  Revenue securities include private activity bonds which are not
payable from the unrestricted revenues of the issuer.  Consequently,  the credit
quality of private  activity  bonds is  usually  directly  related to the credit
standing of the corporate user of the facility involved.

     Municipal  Obligations may also include "moral obligation" bonds, which are
normally  issued by special purpose public  authorities.  If the issuer of moral
obligation  bonds is unable to meet its debt  service  obligations  from current
revenues,  it may draw on a reserve fund,  the  restoration  of which is a moral
commitment but not a legal obligation of the state or municipality which created
the issuer.

     Although the Municipal  Money Market  Portfolio may invest more than 25% of
its net assets in (i) Municipal Obligations whose issuers are in the same state,
(ii) Municipal Obligations the interest on which is paid solely from revenues of
similar projects,  and (iii) private activity bonds bearing Tax-Exempt Interest,
it does not  currently  intend to do so on a regular  basis.  To the  extent the
Municipal  Money  Market   Portfolio's  assets  are  concentrated  in  Municipal
Obligations that are payable from the revenues of similar projects or are issued
by  issuers  located in the same  state,  the  Portfolio  will be subject to the
peculiar risks  presented by the laws and economic  conditions  relating to such
states or projects  to a greater  extent than it would be if its assets were not
so concentrated.

     TAX-EXEMPT DERIVATIVE SECURITIES.  The Municipal Money Market Portfolio may
invest  in  tax-exempt  derivative  securities  such  as  tender  option  bonds,
custodial  receipts,   participations,   beneficial   interests  in  trusts  and
partnership  interests.  A typical tax-exempt  derivative  security involves the
purchase of an interest in a pool of Municipal Obligations

                                       5

<PAGE>

which interest includes a tender option,  demand or other feature,  allowing the
Portfolio  to tender the  underlying  Municipal  Obligation  to a third party at
periodic  intervals and to receive the principal amount thereof.  In some cases,
Municipal Obligations are represented by custodial receipts evidencing rights to
future  principal  or  interest  payments,  or  both,  on  underlying  municipal
securities  held by a custodian and such  receipts  include the option to tender
the underlying securities to the sponsor (usually a bank, broker-dealer or other
financial  institution).  Although the Internal Revenue Service has not ruled on
whether  the  interest  received  on  derivative   securities  in  the  form  of
participation  interests or custodial receipts is Tax-Exempt Interest,  opinions
relating to the validity of, and the tax-exempt  status of payments  received by
the Portfolio  from such  derivative  securities  are rendered by counsel to the
respective  sponsors of such  derivatives  and relied upon by the  Portfolio  in
purchasing  such  securities.  Neither the Portfolio nor its investment  adviser
will  review  the  proceedings  relating  to  the  creation  of  any  tax-exempt
derivative securities or the basis for such legal opinions.

     WHEN-ISSUED   SECURITIES.   The  Portfolio  may  also  purchase   portfolio
securities on a  "when-issued"  basis.  When-issued  securities  are  securities
purchased for delivery  beyond the normal  settlement date at a stated price and
yield. The Portfolio will generally not pay for such securities or start earning
interest on them until they are received.  Securities purchased on a when-issued
basis are  recorded as an asset at the time the  commitment  is entered into and
are  subject to changes in value  prior to  delivery  based upon  changes in the
general level of interest  rates.  The  Portfolio  expects that  commitments  to
purchase  when-issued  securities  will not exceed 25% of the value of its total
assets  absent  unusual  market  conditions.  The  Portfolio  does not intend to
purchase when-issued securities for speculative purposes but only in furtherance
of its investment objective.

     STAND-BY COMMITMENTS. The Portfolio may acquire "stand-by commitments" with
respect  to  Municipal  Obligations  held in its  portfolio.  Under  a  stand-by
commitment, a dealer would agree to purchase at the Portfolio's option specified
Municipal  Obligations  at a  specified  price.  The  acquisition  of a stand-by
commitment may increase the cost, and thereby reduce the yield, of the Municipal
Obligation to which such commitment relates. The Portfolio will acquire stand-by
commitments  solely to  facilitate  portfolio  liquidity  and does not intend to
exercise its rights thereunder for trading purposes.

     ELIGIBLE SECURITIES. The Portfolio will only purchase "eligible securities"
that present  minimal credit risks as determined by the  Portfolio's  investment
adviser  pursuant  to  guidelines  adopted by the Board of  Directors.  Eligible
securities  generally include:  (1) U.S. Government  securities,  (2) securities
that are rated at the time of purchase in the two highest  rating  categories by
at least two Rating Organizations  ("Rating  Organizations") for such securities
(e.g.,  commercial  paper  rated  "A-1" or "A-2" by  Standard  & Poor's  Ratings
Services ("S&P"),  or rated "Prime-1" or "Prime-2" by Moody's Investors Service,
Inc. ("Moody's")),  (3) securities that are rated at the time of purchase by the
only  Rating  Organization  rating  the  security  in  one of  its  two  highest
categories for such securities; (4) securities issued by issuers (or, in certain
cases  guaranteed by persons) with short-term debt having such ratings,  and (5)
and securities that are not rated and are issued by an issuer that does not have
comparable  obligations rated by a Rating Organization  ("Unrated  Securities"),
provided that such  securities  are  determined  to be of comparable  quality to
eligible  rated  securities.   For  a  more  complete  description  of  eligible
securities,  see  "Investment  Objectives  and  Policies"  in the  Statement  of
Additional Information.

     ILLIQUID SECURITIES. The Portfolio will not invest more than 10% of its net
assets in illiquid  securities,  including  repurchase  agreements  which have a
maturity of longer than seven days,  time deposits with  maturities in excess of
seven days,  variable  rate demand notes with demand  periods in excess of seven
days unless the Portfolio's  investment  adviser  determines that such notes are
readily  marketable  and could be sold  promptly at the prices at which they are
valued,  GICs and other securities that are illiquid by virtue of the absence of
a readily  available  market or legal or  contractual  restrictions  on  resale.
Repurchase  agreements  subject to demand are deemed to have a maturity equal to
the notice period.  Securities  that have legal or contractual  restrictions  on
resale but have a readily  available market are not deemed illiquid for purposes
of  this  limitation.  The  Portfolio's  investment  adviser  will  monitor  the
liquidity of such

                                       6

<PAGE>

restricted  securities  under the  supervision  of the Board of  Directors.  See
"Investment  Objectives and  Policies--Illiquid  Securities" in the Statement of
Additional Information.

YEAR 2000
- --------------------------------------------------------------------------------
     Like  other  mutual  funds,   financial  and  business   organizations  and
individuals  around  the  world,  the Fund could be  adversely  affected  if the
computer systems used by the Adviser and the Fund's other service providers,  or
persons with whom they deal, do not properly process and calculate  date-related
information  and data  from and after  January  1,  2000.  This  possibility  is
commonly known as the "Year 2000 Problem." The Year 2000 Problem could also hurt
companies whose securities the Fund holds or securities markets  generally.  The
Fund has been advised by the Adviser,  the Administrators and the Custodian that
they are actively  taking steps to address the Year 2000 Problem with respect to
the computer  systems  that they use and to obtain  assurances  that  comparable
steps are being taken by the Fund's other major service  providers.  While there
can be no  assurance  that  the  Fund's  service  providers  will be  Year  2000
compliant,  the Fund's service providers expect that their plans to be compliant
will be achieved.

INVESTMENT LIMITATIONS
- --------------------------------------------------------------------------------
     The  Municipal  Money  Market  Portfolio's  investment  objective  and  the
policies described above may be changed by the Fund's Board of Directors without
shareholder  approval.  The  Portfolio  may not,  however,  change the following
investment  limitations  without such a vote of  shareholders.  (A more detailed
description  of  the  following  investment  limitations,  together  with  other
investment limitations that cannot be changed without a vote of shareholders, is
contained  in  the  Statement  of  Additional   Information   under  "Investment
Objectives and Policies.")

     The Municipal Money Market Portfolio may not:

         1. Purchase the securities of any issuer,  other than securities issued
     or guaranteed by the U.S. Government or its agencies and instrumentalities,
     if  immediately  after and as a result of such purchase more than 5% of the
     value of its total  assets  would be  invested  in the  securities  of such
     issuer,  or more  than 10% of the  outstanding  voting  securities  of such
     issuer would be owned by the Portfolio,  except that up to 25% of the value
     of the Portfolio's  total assets may be invested  without regard to this 5%
     limitation.

         2. Borrow money,  except from banks for  temporary  purposes and except
     for reverse repurchase agreements, and then in amounts not in excess of 10%
     of the value of the Portfolio's  assets at the time of such borrowing,  and
     only if after such  borrowing  there is asset coverage of at least 300% for
     all borrowings of the Portfolio; or mortgage,  pledge or hypothecate any of
     its assets except in connection  with any such borrowing and in amounts not
     in excess of 10% of the value of the Portfolio's assets at the time of such
     borrowing;  or purchase portfolio securities while borrowings are in excess
     of 5% of the Portfolio's net assets.  (This borrowing  provision is not for
     investment leverage, but solely to facilitate management of the Portfolio's
     securities by enabling the Portfolio to meet redemption  requests where the
     liquidation  of portfolio  securities  is deemed to be  disadvantageous  or
     inconvenient.)

         3. Purchase any securities which would cause more than 25% of the value
     of the total assets of the Portfolio to be invested at the time of purchase
     in obligations of issuers in the same industry.

     In addition,  the Portfolio may not, without Shareholder  approval,  change
its policy of investing during normal market  conditions at least 80% of its net
assets in  obligations  the  interest  on which is  Tax-Exempt  Interest  or AMT
Interest.

     So long as it values its portfolio securities on the basis of the amortized
cost method of valuation  pursuant to Rule 2a-7 under the Investment Company Act
of 1940 (the "1940 Act"), the Municipal Money Market Portfolio will meet the

                                       7

<PAGE>

following   limitation  on  its  investments  in  addition  to  the  fundamental
investment limitations described above. This limitation may be changed without a
vote of shareholders of the Municipal Money Market Portfolio.

         1. The Municipal  Money Market  Portfolio  will not purchase any Put if
     after the acquisition of the Put the Municipal  Money Market  Portfolio has
     more than 5% of its  total  assets  invested  in  instruments  issued by or
     subject  to Puts  from  the same  institution,  except  that the  foregoing
     condition  shall only be  applicable  with respect to 75% of the  Municipal
     Money  Market  Portfolio's  total  assets.  A "Put" means a right to sell a
     specified underlying  instrument within a specified period of time and at a
     specified  exercise  price that may be sold,  transferred  or assigned only
     with the underlying instrument.

PURCHASE AND REDEMPTION OF SHARES
- --------------------------------------------------------------------------------

                               PURCHASE PROCEDURES

     GENERAL.  Shares are sold without a sales load on a continuous basis by the
Distributor.  The  Distributor is located at Four Falls Corporate  Center,  West
Conshohocken,  Pennsylvania  19428.  Investors  may purchase  Shares  through an
account  maintained by the investor with his brokerage  firm (an  "Account") and
may  also  purchase  Shares  directly  by  mail or  wire.  The  minimum  initial
investment is $1,000, and the minimum subsequent investment is $100. The Fund in
its sole discretion may accept or reject any order for purchases of Shares.

     All  payments  for initial  and  subsequent  investments  should be in U.S.
dollars. Purchases will be effected at the net asset value next determined after
PFPC, the Fund's transfer agent, has received a purchase order in good order and
the Fund's  custodian  has Federal Funds  immediately  available to it. In those
cases  where  payment  is made by check,  Federal  Funds will  generally  become
available two Business Days after the check is received. A "Business Day" is any
day that both the New York Stock  Exchange (the "NYSE") and the Federal  Reserve
Bank of Philadelphia (the "FRB") are open. On any Business Day, orders which are
accompanied  by Federal  Funds and received by PFPC by 12:00 noon Eastern  Time,
and orders as to which  payment has been  converted  into Federal Funds by 12:00
noon Eastern Time,  will be executed as of 12:00 noon that Business Day.  Orders
which are  accompanied  by Federal  Funds and  received by PFPC after 12:00 noon
Eastern  Time but prior to the close of regular  trading on the NYSE  (generally
4:00 p.m.  Eastern Time), and orders as to which payment has been converted into
Federal  Funds after 12:00 noon  Eastern  Time but prior to the close of regular
trading on the NYSE on any Business Day of the Fund,  will be executed as of the
close  of  regular  trading  on the  NYSE on that  Business  Day but will not be
entitled to receive  dividends  declared on such Business Day.  Orders which are
accompanied  by Federal  Funds and  received  by PFPC as of the close of regular
trading on the NYSE or later,  and orders as to which payment has been converted
to Federal  Funds as of the close of  regular  trading on the NYSE or later on a
Business Day will be  processed  as of 12:00 noon Eastern Time on the  following
Business Day.

     PURCHASES  THROUGH AN ACCOUNT.  Purchases of Shares may be effected through
an  investor's  Account  with  his  broker  through  procedures  established  in
connection  with the  requirements  of Accounts at such  broker.  In such event,
beneficial  ownership  of Shares  will be  recorded  by the  broker  and will be
reflected in the Account statements provided by the broker to such investors.  A
broker may impose minimum investor Account  requirements.  Even if a broker does
not impose a sales charge for purchases of Shares,  depending on the terms of an
investor's  Account with his broker, the broker may charge an investor's Account
fees for  automatic  investment  and other  services  provided  to the  Account.
Information  concerning  Account  requirements,  services and charges  should be
obtained  from  an  investor's  broker.   This  Prospectus  should  be  read  in
conjunction  with any  information  received from a broker.  Shareholders  whose
shares  are held in the  street  name  account  of a broker  and who  desire  to
transfer such shares to the street name account of another broker should contact
their current broker.

     A broker may offer investors  maintaining  Accounts the ability to purchase
Shares under an automatic purchase program (a "Purchase Program") established by
a participating broker. An investor who participates in a Purchase

                                       8

<PAGE>

Program will have his "free-credit"  cash balances in his Account  automatically
invested in Shares.  The  frequency of  investments  and the minimum  investment
requirement  will be  established  by the broker and the Fund. In addition,  the
broker may require a minimum amount of cash and/or securities to be deposited in
an Account for  participants  in its Purchase  Program.  The  description of the
particular  broker's  Purchase  Program  should  be read  for  details,  and any
inquiries  concerning an Account under a Purchase  Program should be directed to
the broker.

     If a broker makes  special  arrangements  under which orders for Shares are
received by PFPC prior to 12:00 noon Eastern Time and the broker guarantees that
payment for such Shares will be made in  available  Federal  Funds to the Fund's
custodian  prior to the close of regular  trading on the NYSE,  on the same day,
such  purchase  orders will be  effective  and Shares will be  purchased  at the
offering  price in effect as of 12:00 noon Eastern Time on the date the purchase
order is received by PFPC.

     DIRECT PURCHASES. An investor may also make direct investments in Shares at
any time  through any broker that has entered into a dealer  agreement  with the
Distributor (a "Dealer").  An investor may make an initial investment by mail by
fully  completing  and  signing  an  application  obtained  from  a  Dealer  (an
"Application")  and  mailing  it,  together  with a check  payable  to  "Bedford
Municipal Money Market" to "Bedford  Municipal Money Market," c/o PFPC, P.O. Box
8950,  Wilmington,  Delaware  19899.  An  Application  will be  returned  to the
investor  unless it contains  the name of the Dealer from whom it was  obtained.
Subsequent  purchases may be made through a Dealer or by  forwarding  payment to
the Fund's transfer agent at the foregoing address.

     Provided  that the  investment  is at least  $2,500,  an investor  may also
purchase  Shares by having his bank or Dealer wire  Federal  Funds to the Fund's
custodian,  PNC Bank. An investor's  bank or Dealer may impose a charge for this
service.  The Fund does not currently  charge for effecting  wire  transfers but
reserves the right to do so in the future.  In order to ensure prompt receipt of
an investor's  Federal Funds wire,  for an initial  investment,  it is important
that an investor follows these steps:

     A. Telephone the Fund's transfer agent, PFPC,  toll-free  (800)533-7719 (in
Delaware call collect (302) 791-1196), and provide your name, address, telephone
number,  Social Security or Tax  Identification  Number, the amount being wired,
and by which bank or Dealer.  PFPC will then  provide  an  investor  with a Fund
account number.  (Investors with existing accounts should also notify PFPC prior
to wiring funds.)

     B. Instruct your bank or Dealer to wire the specified amount, together with
your assigned account number, to PFPC's account with PNC Bank:
         PNC Bank, N.A., Philadelphia, PA
         ABA-0310-0005-3.
         FROM: (name of investor)
         ACCOUNT NUMBER: (investor's account number with the Portfolio)
         FOR PURCHASE OF: (name of Portfolio)
         AMOUNT: (amount to be invested)

     C.  Complete  and sign the  Application  and mail it to the  address  shown
thereon.  PFPC will not  process  initial  purchase  orders  until it receives a
completed and signed Application.

     For subsequent investments, an investor should follow steps A and B above.

     RETIREMENT  PLANS.  Shares may be purchased in conjunction  with individual
retirement  accounts ("IRAs") and rollover IRAs where PFPC Trust Company acts as
custodian.  For further  information as to applications and annual fees, contact
the Distributor or your broker.  To determine whether the benefits of an IRA are
available and/or appropriate, a shareholder should consult with a tax adviser.

                                       9

<PAGE>

                              REDEMPTION PROCEDURES

     Redemption  orders  are  effected  at the net asset  value  per share  next
determined  after  receipt of the order in proper  form by the  Fund's  transfer
agent, PFPC. Investors may redeem all or some of their Shares in accordance with
one of the procedures described below.

     It is the  responsibility  of the  Dealer to  transmit  promptly  to PFPC a
customer's  redemption  request.  In the  case  of  shareholders  holding  share
certificates,  the certificates must accompany the redemption request. Investors
may redeem all or some of their Shares in accordance  with one of the procedures
described below.

     REDEMPTION  OF SHARES IN AN ACCOUNT.  An  investor  who  beneficially  owns
Shares  through an Account may redeem Shares in his Account in  accordance  with
instructions and limitations pertaining to his Account by contacting his broker.
If such notice is received by PFPC by 12:00 noon  Eastern  Time on any  Business
Day, the redemption will be effective as of 12:00 noon Eastern Time on that day.
Payment of the redemption proceeds will be made after 12:00 noon Eastern Time on
the day the redemption is effected,  provided that the Fund's  custodian is open
for  business.  If the  custodian is not open,  payment will be made on the next
bank business day. If the redemption  request is received between 12:00 noon and
the close of regular  trading on the NYSE on a Business Day, the redemption will
be effective as of the close of regular trading on the NYSE on such Business Day
and payment will be made on the next bank business day following  receipt of the
redemption request. If all Shares are redeemed, all accrued but unpaid dividends
on those Shares will be paid with the redemption proceeds.

     An investor's  brokerage firm may also redeem each day a sufficient  number
of Shares to cover  debit  balances  created by  transactions  in the Account or
instructions  for cash  disbursements.  Shares  will be redeemed on the same day
that a transaction occurs that results in such a debit balance or charge.

     Each  brokerage  firm  reserves  the right to waive or modify  criteria for
participation in an Account or to terminate  participation in an Account for any
reason.

     REDEMPTION  OF SHARES  OWNED  DIRECTLY.  A direct  investor  may redeem any
number of  Shares by  sending a written  request  to  "Bedford  Municipal  Money
Market,"  c/o  PFPC,  P.O.  Box 8950,  Wilmington,  Delaware  19899.  Redemption
requests must be signed by each shareholder in the same manner as the Shares are
registered. Redemption requests for joint accounts require the signature of each
joint owner.  On redemption  requests of $5,000 or more,  each signature must be
guaranteed.  A signature guarantee may be obtained from a domestic bank or trust
company,  broker,  dealer,  clearing  agency  or  savings  association  who  are
participants  in a  medallion  program  recognized  by the  Securities  Transfer
Association. The three recognized medallion programs are the Securities Transfer
Agents Medallion Program (STAMP),  Stock Exchanges  Medallion Program (SEMP) and
New York Stock  Exchange,  Inc.  Medallion  Signature  Program (MSP).  Signature
guarantees that are not part of these programs will not be accepted.

     Direct investors may redeem Shares without charge by telephone if they have
completed  and  returned  an  account  application  containing  the  appropriate
telephone  election.  To add a  telephone  option to an  existing  account  that
previously did not provide for this option, a Telephone  Authorization Form must
be filed with PFPC.  This form is available  from PFPC.  Once this  election has
been made, the  shareholder  may simply contact PFPC by telephone to request the
redemption by calling  (888)  261-4073.  Neither the Fund,  the  Portfolio,  the
Distributor,  PFPC  nor any  other  Fund  agent  will be  liable  for any  loss,
liability,  cost or expense for following the procedures  below or for following
instructions  communicated  by  telephone  that they  reasonably  believe  to be
genuine.

     The Fund's telephone transaction procedures include the following measures:
(1)  requiring  the  appropriate  telephone  transaction  privilege  forms;  (2)
requiring  the caller to provide  the names of the account  owners,  the account
social  security  number and name of the Portfolio,  all of which must match the
Fund's records;  (3) requiring the Fund's service  representative  to complete a
telephone  transaction  form,  listing  all of the above  caller  identification
information; (4) requiring that redemption proceeds be sent only by check to the
account owners of record at the address of record,

                                       10

<PAGE>

or by wire  only to the  owners of record at the bank  account  of  record;  (5)
sending a written  confirmation for each telephone  transaction to the owners of
record at the address of record within five (5) business  days of the call;  (6)
and  maintaining  tapes of telephone  transactions  for six months,  if the Fund
elects to record shareholder telephone transactions. For accounts held of record
by  broker-dealers  (other  than  the  Distributor),   financial   institutions,
securities  dealers,   financial  planners  or  other  industry   professionals,
additional  documentation  or  information  regarding  the  scope of a  caller's
authority is required.  Finally,  for  telephone  transactions  in accounts held
jointly,  additional  information  regarding  other account holders is required.
Telephone  transactions  will not be permitted in  connection  with IRA or other
retirement plan accounts or by an attorney-in-fact under power of attorney.

     The proceeds of a telephone  redemption  request will be mailed by check to
an investor's  registered address unless he has designated in his Application or
Telephone  Authorization Form that such proceeds are to be sent by wire transfer
to a specified  checking or savings account.  If proceeds are to be sent by wire
transfer,  a telephone redemption request received prior to the close of regular
trading on the NYSE,  will  result in  redemption  proceeds  being  wired to the
investor's  bank account on the next bank business  day. The minimum  redemption
for proceeds sent by wire  transfer is $2,500.  There is no maximum for proceeds
sent by wire transfer.  There is no minimum  redemption  for proceeds  mailed by
check;  however, the maximum redemption for proceeds mailed by check is $25,000.
The Fund may modify this redemption  service at any time or charge a service fee
upon prior notice to shareholders, although no fee is currently contemplated.

     REDEMPTION  BY CHECK.  Upon  request,  the Fund  will  provide  any  direct
investor  and any investor who does not have check  writing  privileges  for his
Account with forms of drafts  ("checks")  payable through PNC Bank. These checks
may be made  payable to the order of anyone.  The  minimum  amount of a check is
$100;  however, a broker may establish a higher minimum.  An investor wishing to
use this check writing  redemption  procedure should complete specimen signature
cards (available from PFPC), and then forward such signature cards to PFPC. PFPC
will then  arrange for the checks to be honored by PNC Bank.  Investors  who own
Shares  through an Account  should  contact their  brokers for signature  cards.
Investors  with joint  accounts  may elect to have checks  honored with a single
signature.  Check  redemptions  will be subject to PNC  Bank's  rules  governing
checks. An investor will be able to stop payment on a check redemption. The Fund
or PNC Bank may terminate this redemption service at any time, and neither shall
incur any  liability  for honoring  checks,  for  effecting  redemptions  to pay
checks, or for returning checks which have not been accepted.

     When a check is  presented  to PNC Bank for  clearance,  PNC  Bank,  as the
investor's  agent, will cause the Fund to redeem a sufficient number of full and
fractional  Shares owned by the investor to cover the amount of the check.  This
procedure  enables the investor to continue to receive dividends on those Shares
representing  the amount being redeemed by check until such time as the check is
presented to PNC Bank.  Pursuant to rules under the 1940 Act,  checks may not be
presented for cash payment at the offices of PNC Bank.  This limitation does not
affect checks used for the payment of bills or cashed at other banks.

     ADDITIONAL  REDEMPTION  INFORMATION.  The Fund ordinarily will make payment
for all Shares  redeemed within seven days after receipt by PFPC of a redemption
request in proper form.  Although the Fund will redeem Shares purchased by check
before the check  clears,  payment of  redemption  proceeds may be delayed for a
period of up to fifteen days after their purchase,  pending a determination that
the check has cleared. This procedure does not apply to Shares purchased by wire
payment.  Investors should consider  purchasing  Shares with a certified or bank
check or  money  order  if they  anticipate  an  immediate  need for  redemption
proceeds.

     The Fund imposes no charge when Shares are redeemed.  The Fund reserves the
right to redeem any account in the Class  involuntarily,  on 30 days' notice, if
such account  falls below $500 and during such 30-day  notice  period the amount
invested in such account is not  increased to at least $500.  Payment for Shares
redeemed may be postponed  or the right of  redemption  suspended as provided by
the rules of the Securities and Exchange Commission.

                                       11

<PAGE>

NET ASSET VALUE
- --------------------------------------------------------------------------------
     The net  asset  value  per  share of each  class of the  Portfolio  for the
purpose of pricing  purchase and redemption  orders is determined twice each day
once as of 12:00 noon Eastern Time and once, as of the close of regular  trading
of the NYSE on each weekday with the exception of those holidays on which either
the NYSE or the FRB is closed. Currently, the NYSE is closed on weekends and the
customary  national business holidays of New Year's Day, Dr. Martin Luther King,
Jr. Day,  Presidents' Day, Good Friday,  Memorial Day,  Independence  Day, Labor
Day,  Thanksgiving  Day  and  Christmas  Day  and on  the  preceding  Friday  or
subsequent Monday when one of these holidays falls on a Saturday or Sunday.  The
FRB is currently  closed on weekends and the same  holidays on which the NYSE is
closed as well as Veterans'  Day and Columbus Day. The net asset value per share
of each  class  of the  Portfolio  is  calculated  by  adding  the  value of the
proportionate interest of the class in the securities,  cash and other assets of
the  Portfolio,  deducting the actual and accrued  liabilities  of the class and
dividing the result by the number of  outstanding  shares of the class.  The net
asset value per share of each class of the Fund is determined  independently  of
any of the Fund's other classes.

     The Fund seeks to maintain for the Portfolio a net asset value of $1.00 per
share for  purposes  of  purchases  and  redemptions  and values  its  portfolio
securities on the basis of the amortized  cost method of valuation  described in
the Statement of Additional Information under the heading "Valuation of Shares."
There can be no assurance that net asset value per share will not vary.

     With the  approval  of the  Board of  Directors,  the  Portfolio  may use a
pricing service, bank or broker-dealer  experienced in such matters to value the
Portfolio's  securities.  A more  detailed  discussion  of net  asset  value and
security valuation is contained in the Statement of Additional Information.

MANAGEMENT
- --------------------------------------------------------------------------------

BOARD OF DIRECTORS

     The business and affairs of the Fund and each  investment  portfolio of the
Fund are managed under the direction of the Fund's Board of Directors.  The Fund
currently operates or proposes to operate seventeen investment  portfolios.  The
Municipal Money Market Portfolio is one of these portfolios.

INVESTMENT ADVISER

     BIMC,  an indirect  majority-owned  subsidiary  of PNC Bank,  serves as the
investment  adviser  for the  Municipal  Money  Market  Portfolio.  BIMC has its
principal  offices at Bellevue  Park  Corporate  Center,  400 Bellevue  Parkway,
Wilmington,  Delaware 19809. PNC Bank and its subsidiaries currently manage over
$45.9 billion of assets, of which  approximately $31.4 billion are mutual funds.
PNC Bank,  a  national  bank whose  principal  business  address is 1600  Market
Street,  Philadelphia,  Pennsylvania 19103, is a wholly-owned  subsidiary of PNC
Bancorp,  Inc.  PNC Bancorp Inc. is a bank  holding  company and a  wholly-owned
subsidiary of PNC Bank Corp., a multi-bank holding company.

     As investment  adviser to the Portfolio,  BIMC manages the Portfolio and is
responsible  for all  purchases and sales of portfolio  securities.  In entering
into portfolio  transactions for the Portfolio with a broker, BIMC may take into
account  the  sale  by  such  broker  of  shares  of the  Fund,  subject  to the
requirements of best execution.

     For the services  provided to and expenses assumed by it for the benefit of
the  Portfolio,  BIMC is entitled to receive from the Portfolio a fee,  computed
daily and payable  monthly,  at an annual rate of .35% of the first $250 million
of the  Portfolio's  average daily net assets,  .30% of the next $250 million of
the  Portfolio's  average  daily net  assets and .25% of the  average  daily net
assets of the  Portfolio in excess of $500 million.  BIMC may in its  discretion
from time to time agree to waive  voluntarily all or any portion of its advisory
fee for the Portfolio.

                                       12

<PAGE>

     For the Fund's fiscal year ended August 31, 1998, the Fund paid  investment
advisory fees aggregating  .08% of the average net assets of the Portfolio.  For
that same year,  BIMC waived  approximately  .26% of  investment  advisory  fees
payable to it with respect to the Portfolio.

     PNC Bank was formerly  sub-adviser to the Portfolio and provided  research,
credit analysis and recommendations with respect to the Portfolio's  investments
and supplied  certain  computer  facilities,  personnel and other services.  The
facilities,  personnel,  services and related  expenses have been transferred to
BIMC and in return,  BIMC's  obligation to pay a portion of the sub-advisory fee
to PNC Bank has been  terminated.  For its sub-advisory  services,  PNC Bank was
entitled to receive from BIMC an amount equal to 75% of the investment  advisory
fee  paid  by  the   Portfolio  to  BIMC   (subject  to  adjustment  in  certain
circumstances).  The sub-advisory fees paid by BIMC to PNC Bank had no effect on
the  investment  advisory  fees payable by the  Portfolio to BIMC.  The services
provided by BIMC and the fees payable by the  Portfolio  for these  services are
described  further in the Statement of Additional  Information under "Management
of the Company."

ADMINISTRATOR

     PFPC serves as the  administrator  for the Municipal Money Market Portfolio
and  generally  assists the Portfolio in all aspects of its  administration  and
operation,  including  matters relating to the maintenance of financial  records
and accounting.  PFPC is entitled to an  administration  fee, computed daily and
payable  monthly  at a rate of .10%  of the  average  daily  net  assets  of the
Portfolio.   PFPC's  principal   business  address  is  400  Bellevue   Parkway,
Wilmington, Delaware 19809.

TRANSFER AGENT, DIVIDEND DISBURSING AGENT AND CUSTODIAN

     PFPC Trust Company, an indirect wholly-owned  subsidiary of PNC Bank Corp.,
will succeed PNC Bank, National Association ("PNC Bank") as the Fund's custodian
pursuant to an assignment. PNC Bank will continue to provide certain services to
PFPC Trust  Company.  PFPC  serves as the  Fund's  transfer  agent and  dividend
disbursing  agent.  The  principal  offices of PFPC are located at 400  Bellevue
Parkway,  Wilmington,  Delaware 19809. PFPC may enter into shareholder servicing
agreements  with  registered   broker-dealers   who  have  entered  into  dealer
agreements  with the  Distributor  ("Authorized  Dealers")  for the provision of
certain shareholder support services to customers of such Authorized Dealers who
are shareholders of the Fund. The services  provided and the fees payable by the
Fund for these services are described in the Statement of Additional Information
under "Investment Advisory, Distribution and Servicing Arrangements."

DISTRIBUTOR

     Provident  Distributors,  Inc., with a principal  business  address at Four
Falls  Corporate  Center,   West  Conshohocken,   Pennsylvania  19428,  acts  as
Distributor  of the Shares  pursuant to a distribution  agreement  dated May 29,
1998 (the "Distribution Agreement").

EXPENSES

     The expenses of each  Portfolio  are deducted from the total income of such
Portfolio  before  dividends are paid. Any general expenses of the Fund that are
not readily  identifiable as belonging to a particular  investment  portfolio of
the Fund will be allocated among all investment  portfolios of the Fund based on
the relative net assets of the  investment  portfolios at the time such expenses
were accrued.  The Bedford Classes of the Fund pay their own distribution  fees,
and may pay a different  share than other classes of the Fund of other  expenses
(excluding  advisory and custodial fees) if these expenses are actually incurred
in a  different  amount by the  Bedford  Classes  or if they  receive  different
services.

                                       13

<PAGE>

     The investment adviser may assume additional expenses of the Portfolio from
time to time.  In certain  circumstances,  it may assume  such  expenses  on the
condition  that it is  reimbursed by the Portfolio for such amounts prior to the
end of a fiscal year. In such event, reimbursement of such amounts will have the
effect of increasing  the  Portfolio's  expense  ratio and of lowering  yield to
investors.

     For the fiscal year ended August 31,  1998,  total  expenses  were 1.15% of
average net assets  with  respect to the Bedford  Class of the  Municipal  Money
Market Portfolio (not taking into account waivers of .26%).

DISTRIBUTION OF SHARES
- --------------------------------------------------------------------------------
     The Board of  Directors of the Fund  approved and adopted the  Distribution
Agreement and separate Plan of Distribution  for the Class (the "Plan") pursuant
to Rule 12b-1 under the 1940 Act. Under the Plan, the Distributor is entitled to
receive  from the Class a  distribution  fee,  which is  accrued  daily and paid
monthly, of up to .65% on an annualized basis of the average daily net assets of
the Class.  The actual amount of such  compensation  is agreed upon from time to
time  by  the  Fund's  Board  of  Directors  and  the  Distributor.   Under  the
Distribution  Agreement,  the Distributor has agreed to accept  compensation for
its services  thereunder and under the Plan in the amount of .60% of the average
daily  net  assets  of the  Class  on an  annualized  basis  in any  year.  Such
compensation may be increased,  up to the amount permitted in the Plan, with the
approval of the Fund's  Board of  Directors.  Pursuant to the  conditions  of an
exemptive  order  granted  by  the  Securities  and  Exchange  Commission,   the
Distributor  has agreed to waive its fee with respect to the Class on any day to
the extent necessary to assure that the fee required to be accrued by such Class
does  not  exceed  the  income  of such  Class on that  day.  In  addition,  the
Distributor may, in its discretion,  voluntarily  waive from time to time all or
any portion of its distribution fee.

     Under  the  Distribution  Agreement  and  the  Plan,  the  Distributor  may
reallocate  an amount up to the full fee that it receives to Dealers  based upon
the  aggregate  investment  amounts  maintained  by  and  services  provided  to
shareholders  of the Class serviced by such Dealers.  The  Distributor  may also
reimburse  Dealers for other  expenses  incurred in the promotion of the sale of
Fund  shares.  The  Distributor  and/or  Dealers  pay for the  cost of  printing
(excluding  typesetting) and mailing to prospective  investors  prospectuses and
other  materials  relating  to the  Fund  as well as for  related  direct  mail,
advertising and promotional expenses.

     The Plan obligates the Fund,  during the period it is in effect,  to accrue
and pay to the  Distributor  on behalf of the Class the fee  agreed to under the
Distribution  Agreement.  Payments  under  the  Plan are not  based on  expenses
actually incurred by the Distributor,  and the payments may exceed  distribution
expenses actually incurred.

DIVIDENDS AND DISTRIBUTIONS
- --------------------------------------------------------------------------------
     The Fund will distribute substantially all of the net investment income and
net realized  capital gains, if any, of the Municipal Money Market  Portfolio to
the Portfolio's  shareholders.  All  distributions are reinvested in the form of
additional full and fractional Shares unless a shareholder elects otherwise.

     The net investment income (not including any net short-term  capital gains)
earned by the Portfolio will be declared as a dividend on a daily basis and paid
monthly.  Dividends are payable to shareholders of record  immediately  prior to
the  determination of net asset value made as of the close of regular trading on
the NYSE.  Net short-term  capital  gains,  if any, will be distributed at least
annually.

                                       14

<PAGE>

TAXES
- --------------------------------------------------------------------------------
     Distributions  from the Municipal  Money Market  Portfolio  will  generally
constitute  tax-exempt  income for shareholders for federal income tax purposes.
It is possible,  depending upon the Portfolio's  investments,  that a portion of
the  Portfolio's  distributions  could be taxable to  shareholders  as  ordinary
income or capital gains, but it is not expected that this will be the case.

     Although distributions from the Municipal Money Market Portfolio are exempt
for federal income tax purposes,  they will generally  constitute taxable income
for state and local income tax purposes except that, subject to limitations that
vary  depending on the state,  distributions  from  interest  paid by a state or
municipal entity may be exempt from tax in that state.

     Interest on  indebtedness  incurred by a  shareholder  to purchase or carry
shares of the Municipal Money Market Portfolio  generally will not be deductible
for federal income tax purposes.

     You should note that a portion of the exempt-interest dividends paid by the
Municipal  Money Market  Portfolio may  constitute an item of tax preference for
purposes   of   determining   federal   alternative   minimum   tax   liability.
Exempt-interest  dividends  will also be  considered  along with other  adjusted
gross income in determining  whether any Social Security or railroad  retirement
payments received by you are subject to federal income taxes.

     The  foregoing  is only a summary of certain tax  considerations  under the
current law,  which may be subject to change in the future.  You should  consult
your tax adviser for further information regarding federal,  state, local and/or
foreign tax consequences relevant to your specific situation.

DESCRIPTION OF SHARES
- --------------------------------------------------------------------------------
     The Fund has  authorized  capital of thirty billion shares of Common Stock,
$.001 par  value  per  share,  of which  18.326  billion  shares  are  currently
classified  into 97  different  classes  of Common  Stock (see  "Description  of
Shares" in the Statement of Additional Information).

     The Fund offers  multiple  classes of shares in the Municipal  Money Market
Portfolio  to expand its  marketing  alternatives  and to  broaden  its range of
services to  different  investors.  The expenses of the various  classes  within
these  Portfolios  vary  based  upon the  services  provided,  which may  affect
performance.  Each class of common  stock of the Fund has a separate  Rule 12b-1
distribution plan. Under the Distribution  Agreement and pursuant to each of the
distribution  plans,  the  Distributor is entitled to receive from each class as
compensation for distribution services provided to that class a distribution fee
based on average daily net assets. A salesperson or any other person entitled to
receive   compensation   for  servicing   Fund  shares  may  receive   different
compensation  with respect to different  classes in a Portfolio of the Fund.  An
investor may contact the Fund's distributor by calling 1-800-888-9723 to request
more information concerning other classes available.

     THIS  PROSPECTUS AND THE STATEMENT OF ADDITIONAL  INFORMATION  INCORPORATED
HEREIN  RELATE  PRIMARILY  TO THE BEDFORD  CLASS OF THE  MUNICIPAL  MONEY MARKET
PORTFOLIO AND DESCRIBE ONLY THE INVESTMENT  OBJECTIVE AND POLICIES,  OPERATIONS,
CONTRACTS AND OTHER MATTERS RELATING TO SUCH CLASS OF THIS PORTFOLIO.

     Each  share that  represents  an  interest  in the  Portfolio  has an equal
proportionate  interest in the assets belonging to the Portfolio with each other
share that  represents  an interest in the  Portfolio,  even where a share has a
different class  designation than another share  representing an interest in the
Portfolio.  Shares of the Fund do not have preemptive or conversion rights. When
issued for payment as  described in this  Prospectus,  Shares will be fully paid
and non-assessable.

                                       15

<PAGE>

     The Fund currently does not intend to hold annual  meetings of shareholders
except  as  required  by the 1940 Act or other  applicable  law.  The law  under
certain circumstances provides shareholders with the right to call for a meeting
of shareholders to consider the removal of one or more directors.  To the extent
required  by law,  the Fund will  assist in  shareholder  communication  in such
matters.

     Holders of shares of the  Portfolio  will vote in the  aggregate and not by
class  on  all  matters,  except  where  otherwise  required  by  law.  Further,
shareholders of all investment portfolios of the Fund will vote in the aggregate
and not by portfolio  except as  otherwise  required by law or when the Board of
Directors determines that the matter to be voted upon affects only the interests
of the shareholders of a particular investment portfolio.  (See the Statement of
Additional Information under "Additional Information Concerning Fund Shares" for
examples when the 1940 Act requires voting by investment portfolio or by class.)
Shareholders  of the Fund are  entitled  to one vote for each  full  share  held
(irrespective of class or portfolio) and fractional votes for fractional  shares
held.  Voting rights are not cumulative  and,  accordingly,  the holders of more
than 50% of the  aggregate  shares of common  stock of the Fund may elect all of
the directors.

     As of November 16, 1998, to the Fund's knowledge,  no person held of record
or  beneficially  25% or more of the  outstanding  shares of all  classes of the
Fund.

OTHER INFORMATION
- --------------------------------------------------------------------------------

REPORTS AND INQUIRIES

     Shareholders  will receive  unaudited  semi-annual  reports  describing the
Fund's  investment   operations  and  annual  financial  statements  audited  by
independent accountants.  Shareholder inquiries should be addressed to PFPC, the
Fund's transfer agent,  Bellevue Park Corporate  Center,  400 Bellevue  Parkway,
Wilmington,  Delaware 19809,  toll-free (800) 533-7719 (in Delaware call collect
(302) 791-1196).

                                       16

<PAGE>

                      (This Page Intentionally Left Blank.)

<PAGE>

                      (This Page Intentionally Left Blank.)

<PAGE>

NO  PERSON  HAS  BEEN  AUTHORIZED  TO  GIVE  ANY  INFORMATION  OR  TO  MAKE  ANY
REPRESENTATIONS  NOT CONTAINED IN THIS PROSPECTUS OR IN THE FUND'S  STATEMENT OF
ADDITIONAL INFORMATION  INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE
OFFERING MADE BY THIS  PROSPECTUS  AND, IF GIVEN OR MADE,  SUCH  INFORMATION  OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE FUND OR
ITS DISTRIBUTOR.  THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY THE FUND OR
BY THE  DISTRIBUTOR IN ANY  JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY
BE MADE.


                              --------------------
                                    CONTENTS

                                                                           PAGE
Introduction ...........................................................     2
Financial Highlights ...................................................     3
Investment Objectives and Policies. ....................................     5
Year 2000 ..............................................................     7
Investment Limitations .................................................     7
Purchase And Redemption Of Shares. .....................................     8
Net Asset Value. .......................................................    12
Management .............................................................    12
Distribution Of Shares .................................................    14
Dividends And Distributions. ...........................................    14
Taxes. .................................................................    15
Description Of Shares. .................................................    15
Other Information. .....................................................    16

INVESTMENT ADVISER
BlackRock Institutional Management Corporation
Wilmington, Delaware

DISTRIBUTOR
Provident Distributors, Inc.
West Conshohocken, Pennsylvania

CUSTODIAN
PFPC Trust Company
Wilmington, Delaware

ADMINISTRATOR AND TRANSFER AGENT
PFPC Inc.
Wilmington, Delaware

COUNSEL
Drinker Biddle & Reath LLP
Philadelphia, Pennsylvania

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers LLP
Philadelphia, Pennsylvania

<PAGE>
================================================================================
                                     BEDFORD
                                   GOVERNMENT
                                   OBLIGATIONS
                                  MONEY MARKET
                                    PORTFOLIO

                                   Prospectus


                                December 29, 1998

<PAGE>

                                     BEDFORD
                             GOVERNMENT OBLIGATIONS
                             MONEY MARKET PORTFOLIO
                                       OF
                               THE RBB FUND, INC.

     The  investment  objective  of  the  Government  Obligations  Money  Market
Portfolio  is to  provide  as high a level  of  current  interest  income  as is
consistent with maintaining liquidity and stability of principal. The Government
Obligations  Money Market Portfolio seeks to achieve such objective by investing
in short-term  U.S.  Treasury  bills and notes and other  obligations  issued or
guaranteed  by the U.S.  Government  or its agencies or  instrumentalities,  and
entering into repurchase  agreements  relating to such obligations.  The Bedford
shares of the Government  Obligations  Money Market  Portfolio (the  "Government
Obligations Money Market Portfolio" or the "Portfolio") are a class of shares of
common  stock  of The RBB  Fund,  Inc.  (the  "Fund"),  an  open-end  management
investment  company.  Shares of the Class are  offered  by this  Prospectus  and
represent interests in the Portfolio.

     SHARES OF THE FUND ARE NOT DEPOSITS OR  OBLIGATIONS  OF, OR  GUARANTEED  OR
ENDORSED BY PNC BANK, NATIONAL ASSOCIATION, PFPC TRUST COMPANY OR ANY OTHER BANK
AND  SHARES  ARE  NOT  FEDERALLY   INSURED  BY  THE  FEDERAL  DEPOSIT  INSURANCE
CORPORATION,  THE FEDERAL  RESERVE  BOARD,  OR ANY OTHER AGENCY.  INVESTMENTS IN
SHARES OF THE FUND INVOLVE  INVESTMENT  RISKS,  INCLUDING  THE POSSIBLE  LOSS OF
PRINCIPAL. THERE CAN BE NO ASSURANCE THAT THE PORTFOLIO WILL BE ABLE TO MAINTAIN
A STABLE NOT ASSET VALUE OF $1.00 PER SHARE.

     BlackRock Institutional Management Corporation serves as investment adviser
for the Portfolio, PFPC Trust Company serves as custodian for the Fund, and PFPC
Inc. serves as administrator and transfer and dividend  disbursing agent for the
Fund. Provident Distributors, Inc. acts as distributor for the Fund.

     This Prospectus  contains concise  information that a prospective  investor
needs to know before investing. Please keep it for future reference. A Statement
of  Additional  Information,  dated  December 29, 1998,  has been filed with the
Securities  and Exchange  Commission  and is  incorporated  by reference in this
Prospectus.  It may be  obtained  upon  request  free of charge from the Fund by
calling (800) 430-9618.  The Prospectus and Statement of Additional  Information
are also available for  reference,  along with other related  materials,  on the
Internet Website (http://www.sec.gov).
- --------------------------------------------------------------------------------
THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THIS
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------

PROSPECTUS                                                     December 29, 1998

<PAGE>

INTRODUCTION
- --------------------------------------------------------------------------------
     The  RBB  Fund,  Inc.  is  an  open-end   management   investment   company
incorporated  under the laws of the State of Maryland on February 29, 1988.  The
Fund  is  currently   operating  or  proposing  to  operate  seventeen  separate
investment  portfolios.  The shares ("Shares")  offered by this Prospectus are a
class  ("Class")  of the  shares  of  common  stock of the  Fund  and  represent
interests in the Fund's Government Obligations Money Market Portfolio.

     The investment  objective of the Portfolio is to provide as high a level of
current  interest  income  as  is  consistent  with  maintaining  liquidity  and
stability  of  principal.  To  achieve  its  objective,  the  Portfolio  invests
exclusively in short-term  U.S.  Treasury bills and notes and other  obligations
issued   or   guaranteed   by  the   U.S.   Government   or  its   agencies   or
instrumentalities,  and  enters  into  repurchase  agreements  relating  to such
obligations.

     The  Portfolio  seeks to  maintain  a net asset  value of $1.00 per  share;
however, there can be no assurance that the Portfolio will be able to maintain a
stable net asset value of $1.00 per share.

     The Portfolio's  investment adviser is BlackRock  Institutional  Management
Corporation  ("BIMC").  PFPC Trust Company  serves as custodian for the Fund and
PFPC Inc. ("PFPC") serves as administrator and transfer and dividend  disbursing
agent for the Fund.  Provident  Distributors,  Inc. (the  "Distributor") acts as
distributor of the Fund's shares.

     An investor may purchase and redeem Shares  through his broker or by direct
purchases or redemptions. See "Purchase and Redemption of Shares."

     An investment in the Portfolio is subject to certain risks, as set forth in
detail under "Investment  Objective and Policies." The Portfolio,  to the extent
set forth under "Investment Objective and Policies," may engage in the following
investment practices among others: the use of repurchase  agreements and reverse
repurchase  agreements,  the  purchase of  mortgage-related  securities  and the
lending of securities.  All of these transactions involve certain special risks,
as set forth under "Investment Objective and Policies." 

FEE TABLE

     The Fee Table below  contains a summary of annual fund  operating  expenses
incurred by the Government  Obligations Money Market Portfolio during the fiscal
year ended  August 31, 1998 as a  percentage  of average  daily net  assets.  An
example based on the summary is also provided.

ANNUAL FUND OPERATING EXPENSES (BEDFORD CLASS)
     AS A PERCENTAGE OF AVERAGE DAILY NET ASSETS
Management Fees (after waivers)(1) ...................................      .30%
12b-1 Fees(1) ........................................................      .57
Other Expenses(1) ....................................................     .105
                                                                           ----
Total Fund Operating Expenses (Bedford Class) (after waivers)(1) .....     .975%
                                                                           ====

(1) Management Fees and 12b-1 Fees are based on average daily net assets and are
    calculated  daily  and  paid  monthly.  Before  waivers  for the  Government
    Obligations Money Market Portfolio,  Management Fees would be .42% and Total
    Fund Operating Expenses would be 1.10%.

EXAMPLE

An investor would pay the following  expenses on a $1,000  investment,  assuming
(1) 5% annual return and (2) redemption at the end of each time period:

                                    1 YEAR     3 YEARS     5 YEARS    10 YEARS
                                    ------     -------     -------    --------
Government Obligations
     Money Market Portfolio*
     (Bedford Class) ..............  $10         $31         $54        $120
* Other classes of this Portfolio are sold with different fees and expenses.

                                       2

<PAGE>

     The Example in the Fee Table assumes that all  dividends and  distributions
are reinvested and that the amounts listed under "Annual Fund Operating Expenses
(Bedford  Class)" remain the same in the years shown.  THE EXAMPLE SHOULD NOT BE
CONSIDERED A  REPRESENTATION  OF PAST OR FUTURE EXPENSES AND ACTUAL EXPENSES MAY
BE GREATER OR LESS THAN THOSE SHOWN.  Long-term  shareholders  may pay more than
the economic  equivalent of the maximum  front-end sales charge permitted by the
National Association of Securities Dealers, Inc.

     The Fee Table is  designed  to  assist an  investor  in  understanding  the
various  costs  and  expenses  that an  investor  in the  Bedford  Class  of the
Portfolio will bear directly or indirectly.  (For more complete  descriptions of
the various  costs and expenses,  see  "Management  --  Investment  Adviser" and
"Distribution  of Shares"  below.) Expense figures are based on actual costs and
fees  charged  to the  Class.  The Fee  Table  reflects  a  voluntary  waiver of
Management Fees for the Portfolio.  However,  there can be no assurance that any
future  waivers of Management  Fees will not vary from the figures  reflected in
the Fee Table.  To the  extent  that any  service  providers  assume  additional
expenses of a Portfolio,  such  assumption will have the effect of lowering such
Portfolio's overall expense ratio and increasing its yield to investors.

     From time to time,  the Class  advertises its "total  return",  "yield" and
"effective  yield."  TOTAL  RETURN  AND YIELD  FIGURES  ARE BASED ON  HISTORICAL
EARNINGS AND ARE NOT INTENDED TO INDICATE FUTURE PERFORMANCE. The "yield" of the
Class  refers to the  income  generated  by an  investment  in the Class  over a
seven-day period (which period will be stated in the advertisement). This income
is then  "annualized." That is, the amount of income generated by the investment
during that week is assumed to be generated  each week over a 52-week period and
is shown as a percentage of the investment.  The "effective yield" is calculated
similarly but, when annualized,  the income earned by an investment in the Class
is assumed to be reinvested.  The "effective yield" will be slightly higher than
the "yield" because of the compounding effect of this assumed reinvestment.

     The total  return and yield of any  investment  is  generally a function of
portfolio quality and maturity,  type of investment and operating expenses.  The
total  return  and  yield  on  Shares  will  fluctuate  and is  not  necessarily
representative of future results. Any fees charged by broker/dealers directly to
their customers in connection with investments in the Class are not reflected in
the total return and yield of Shares, and such fees, if charged, will reduce the
actual return received by shareholders  on their  investments.  The total return
and yield on Shares of the Class may differ from the total  return and yields on
shares  of other  classes  of the Fund  that  also  represent  interests  in the
Portfolio  depending  on  the  allocation  of  expenses  to  each  class  of the
Portfolio. See "Expenses."

FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
     The table below sets forth certain  information  concerning  the investment
results  of  the  Bedford  Class  of the  Government  Obligations  Money  Market
Portfolio for the periods  indicated.  The financial data included in this table
for each of the periods  ended August 31, 1994 through  August 31, 1998 are part
of  the  Fund's  financial  statements  for  the  Portfolio,   which  have  been
incorporated by reference into the Statement of Additional  Information and have
been  audited  by  PricewaterhouseCoopers  LLP  ("PricewaterhouseCoopers"),  the
Fund's  independent  accountants.  The financial  data for the Portfolio for the
periods ended August 31, 1989,  1990,  1991,  1992 and 1993 are part of previous
financial  statements  audited by  PricewaterhouseCoopers.  The  financial  data
should be read in conjunction  with the financial  statements and notes thereto.
Further  information  about the performance of the Portfolio is available in the
Annual Report to Shareholders.  Both the Statement of Additional Information and
the Annual Report to Shareholders  may be obtained free of charge by calling the
telephone number on page 1 of this Prospectus.

                                       3

<PAGE>

       BEDFORD CLASS OF THE GOVERNMENT OBLIGATIONS MONEY MARKET PORTFOLIO

THE RBB FUND INC. FINANCIAL HIGHLIGHTS (c)
     (FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

<TABLE>
<CAPTION>
                                                                 GOVERNMENT OBLIGATIONS MONEY MARKET PORTFOLIO                    
                            ------------------------------------------------------------------------------------------------------
                                                                                                                                  
                                                                                                                                  
                              FOR THE      FOR THE     FOR THE      FOR THE      FOR THE      FOR THE      FOR THE      FOR THE   
                            YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED 
                            AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31, 
                               1998         1997         1996         1995         1994         1993         1992         1991    
                            ----------   ----------   ----------   ----------   ----------   ----------   ----------   ---------- 
<S>                          <C>         <C>          <C>           <C>          <C>          <C>          <C>         <C>        
Net asset value,
   beginning of period ..... $   1.00    $     1.00     $   1.00    $   1.00     $   1.00     $   1.00     $   1.00    $   1.00   
                             --------      --------     --------    --------     --------     --------     --------    --------   
Income from investment
   operations:
   Net investment income ...   0.0463        0.0449       0.0458      0.0475       0.0270       0.0231       0.0375      0.0604   
   Net gains on securities
     (both realized
     and unrealized) .......       --            --           --          --           --           --       0.0009          --   
                             --------      --------     --------    --------     --------     --------     --------    --------   
       Total from
         investment
         operations ........   0.0463        0.0449       0.0458      0.0475       0.0270       0.0231       0.0384      0.0604   
                             --------      --------     --------    --------     --------     --------     --------    --------   
Less distributions
   Dividends (from net
     investment income) ....  (0.0463)      (0.0449)     (0.0458)    (0.0475)     (0.0270)     (0.0231)     (0.0375)    (0.0604)  
   Distributions (from
     capital gains) ........       --            --           --          --           --           --      (0.0009)         --   
                             --------      --------     --------    --------     --------     --------     --------    --------   
       Total distributions .  (0.0463)      (0.0449)     (0.0458)    (0.0475)     (0.0270)     (0.0231)     (0.0384)    (0.0604)  
                             --------      --------     --------    --------     --------     --------     --------    --------   
Net asset value,
   end of period ........... $   1.00    $     1.00     $   1.00    $   1.00     $   1.00     $   1.00     $   1.00    $   1.00   
                             ========      ========     ========    ========     ========     ========     ========    ========   
Total Return ...............    4.74%         4.59%        4.68%       4.86%        2.73%        2.33%        3.91%       6.21%   
Ratios/Supplemental Data
   Net assets, end of
     period (000) .......... $128,447      $209,715     $192,599    $163,398     $166,418     $213,741     $225,101    $368,899   
   Ratios of expenses to
     average net assets ....  .975%(a)      .975%(a)     .975%(a)    .975%(a)     .975%(a)     .975%(a)     .975%(a)     .95%(a)  
   Ratios of net investment
     income to average
     net assets ............    4.63%         4.49%        4.58%       4.75%        2.70%        2.31%        3.75%       6.04%   
</TABLE>

<TABLE>
<CAPTION>
                            GOVERNMENT OBLIGATIONS MONEY MARKET PORTFOLIO
                            ---------------------------------------------
                                                 FOR THE PERIOD
                                                SEPTEMBER 30, 1988
                                   FOR THE        (COMMENCEMENT
                                  YEAR ENDED    OF OPERATIONS) TO
                                  AUGUST 31,        AUGUST 31,
                                     1990              1989  
                                  ----------    ------------------
<S>                                <C>                <C>
Net asset value,                  
   beginning of period .........   $   1.00           $   1.00
                                   --------           --------
Income from investment            
   operations:                    
   Net investment income .......     0.0748             0.0725
   Net gains on securities        
     (both realized               
     and unrealized) ...........         --                 --
                                   --------           --------
       Total from                 
         investment               
         operations ............     0.0748             0.0725
                                   --------           --------
Less distributions                
   Dividends (from net            
     investment income) ........    (0.0748)           (0.0725)
   Distributions (from            
     capital gains) ............         --                 --
                                   --------           --------
       Total distributions .....    (0.0748)           (0.0725)
                                   --------           --------
Net asset value,                  
   end of period ...............   $   1.00           $   1.00
                                   ========           ========
Total Return ...................      7.74%            8.64%(b)
Ratios/Supplemental Data          
   Net assets, end of             
     period (000) ..............   $209,378           $ 66,281
   Ratios of expenses to          
     average net assets ........     .95%(a)         .96%(a)(b)
   Ratios of net investment       
     income to average            
     net assets ................      7.48%            8.34%(b)
                              
<FN>
(a) Without the waiver of advisory fees and without the reimbursement of certain
    operating  expenses,  the ratios of  expenses  to average net assets for the
    Government  Obligations Money Market Portfolio would have been 1.10%, 1.09%,
    1.10%,  1.13%,  1.17%,  1.18%,  1.12%,  1.13% and 1.17% for the years  ended
    August  31,  1998,  1997,  1996,  1995,  1994,  1993,  1992,  1991 and 1990,
    respectively, and 1.40% annualized for the period ended August 31, 1989.

(b) Annualized.

(c) Financial  Highlights  relate  solely to the Bedford  Class of shares of the
    Government Obligations Money Market Portfolio.
</FN>
</TABLE>

                                       4

<PAGE>

INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
     The Government Obligations Money Market Portfolio's investment objective is
to provide  as high a level of current  interest  income as is  consistent  with
maintaining  liquidity  and  stability  of  principal.  It seeks to achieve such
objective  by investing  in  short-term  U.S.  Treasury  bills,  notes and other
obligations  issued or  guaranteed  by the U.S.  Government  or its  agencies or
instrumentalities,  and entering  into  repurchase  agreements  relating to such
obligations. The types of U.S. Government obligations in which the Portfolio may
invest  include a variety of U.S.  Treasury  obligations,  which  differ only in
their interest rates, maturities,  and times of issuance, and obligations issued
or  guaranteed  by the U.S.  Government  or its  agencies or  instrumentalities,
including  mortgage-related  securities.  Obligations  of certain  agencies  and
instrumentalities  of the  U.S.  Government,  such  as the  Government  National
Mortgage  Association  and the  Export-Import  Bank of the  United  States,  are
supported  by the full faith and credit of the U.S.  Treasury;  others,  such as
those of the Federal National Mortgage  Association,  are supported by the right
of the  issuer  to  borrow  from  the  Treasury;  others  are  supported  by the
discretionary  authority  of  the  U.S.  Government  to  purchase  the  agency's
obligations; still others, such as those of the Federal Farm Credit Banks or the
Federal Home Loan Mortgage Corporation,  are supported only by the credit of the
instrumentality.  No  assurance  can be given  that the  U.S.  Government  would
provide   financial   support   to   U.S.   Government-sponsored   agencies   or
instrumentalities  if it is not obligated to do so under law. The Portfolio will
invest in the  obligations of such agencies or  instrumentalities  only when the
investment  adviser  believes  that the  credit  risk with  respect  thereto  is
minimal.  There is no assurance that the investment  objective of the Government
Obligations Money Market Portfolio will be achieved.

     Securities  issued or guaranteed by the U.S.  Government,  its agencies and
instrumentalities have historically involved little risk of loss of principal if
held to maturity.  However,  due to fluctuations  in interest rates,  the market
value of such  securities  may vary during the period a shareholder  owns Shares
representing  interests in the Portfolio.  Certain government securities held by
the  Portfolio  may  have  remaining  maturities  exceeding  397  days  if  such
securities  provide for  adjustments in their interest rates not less frequently
than every 397 days and the  adjustments  are sufficient to cause the securities
to have market values, after adjustment, which approximate their par values.

     REPURCHASE  AGREEMENTS.  The  Portfolio  may agree to  purchase  government
securities  from  financial  institutions  subject to the seller's  agreement to
repurchase them at an agreed-upon time and price ("repurchase agreements").  The
securities  held subject to a repurchase  agreement  may have stated  maturities
exceeding 13 months,  provided the repurchase  agreement  itself matures in less
than 13 months.  Default by or bankruptcy of the seller would,  however,  expose
the  Portfolio  to possible  loss because of adverse  market  action or delay in
connection with the disposition of the underlying obligations.

     REVERSE REPURCHASE  AGREEMENTS.  The Portfolio may borrow funds by entering
into  reverse   repurchase   agreements  in  accordance   with  the   investment
restrictions  described below. A reverse repurchase agreement involves a sale by
a portfolio of securities  that it holds  concurrently  with an agreement by the
Portfolio  to  repurchase  them  at an  agreed  upon  time  and  price.  Reverse
repurchase  agreements  involve the risk that the market value of the  portfolio
securities  sold by the  Portfolio  may  decline  below  the  price at which the
Portfolio is obligated to repurchase them. The Portfolio would consider entering
into reverse repurchase  agreements to avoid otherwise selling securities during
unfavorable market conditions to meet redemptions. Reverse repurchase agreements
are considered to be borrowings by the Portfolio  under the  Investment  Company
Act of 1940 (the "1940 Act").

     MORTGAGE-RELATED   SECURITIES.   Mortgage-related   securities  consist  of
mortgage  loans,  which are  assembled  into pools,  the  interests on which are
issued and guaranteed by an agency or  instrumentality  of the U.S.  Government,
though not necessarily by the U.S. Government itself.

                                       5

<PAGE>

     ASSET-BACKED   SECURITIES.   The  Portfolio  may  invest  in   asset-backed
securities which are backed by mortgages,  installment  sales contracts,  credit
card  receivables  or  other  assets  and  collateralized  mortgage  obligations
("CMOs") issued or guaranteed by U.S. Government agencies and  instrumentalities
or issued by private companies.  Asset-backed securities also include adjustable
rate securities.  The estimated life of an asset-backed security varies with the
prepayment experience with respect to the underlying debt instruments.  For this
and other reasons, an asset-backed  security's stated maturity may be shortened,
and the  security's  total return may be difficult  to predict  precisely.  Such
difficulties  are not expected,  however,  to have a  significant  effect on the
Portfolio since the remaining  maturity of any  asset-backed  security  acquired
will be 13 months or less.  Asset-backed  securities  are considered an industry
for industry concentration purposes. See "Investment Limitations." In periods of
falling  interest  rates,  the rate of mortgage  prepayments  tends to increase.
During these periods, the reinvestment of proceeds by a portfolio will generally
be at lower rates than the rates on the prepaid obligations.

     LENDING OF SECURITIES. The Portfolio may also lend its portfolio securities
to  financial  institutions  in  accordance  with  the  investment  restrictions
described below. Such loans would involve risks of delay in receiving additional
collateral in the event the value of the collateral decreased below the value of
the securities  loaned or of delay in recovering  the securities  loaned or even
loss of rights in the  collateral  should the  borrower of the  securities  fail
financially.  However,  loans  will be  made  only to  borrowers  deemed  by the
Portfolio's  investment  adviser to be of good  standing  and only when,  in the
adviser's  judgment,  the  income to be  earned  from the  loans  justifies  the
attendant  risks.  Any  loans  of  the  Portfolio's  securities  will  be  fully
collateralized and marked to market daily.

     ILLIQUID SECURITIES. The Portfolio will not invest more than 10% of its net
assets in illiquid  securities,  including  repurchase  agreements  which have a
maturity of longer  than seven days and other  securities  that are  illiquid by
virtue of the  absence  of a readily  available  market or legal or  contractual
restrictions on resale.  Repurchase  agreements  subject to demand are deemed to
have a  maturity  equal to the  notice  period.  Securities  that have  legal or
contractual  restrictions on resale but have a readily  available market are not
deemed  illiquid for purposes of this  limitation.  The  Portfolio's  investment
adviser  will  monitor the  liquidity of such  restricted  securities  under the
supervision  of  the  Board  of  Directors.   See  "Investment   Objectives  and
Policies--Illiquid Securities" in the Statement of Additional Information.

YEAR 2000
- --------------------------------------------------------------------------------
     Like  other  mutual  funds,   financial  and  business   organizations  and
individuals  around  the  world,  the Fund could be  adversely  affected  if the
computer systems used by the Adviser and the Fund's other service providers,  or
persons with whom they deal, do not properly process and calculate  date-related
information  and data  from and after  January  1,  2000.  This  possibility  is
commonly known as the "Year 2000 Problem." The Year 2000 Problem could also hurt
companies whose securities the Fund holds or securities markets  generally.  The
Fund has been advised by the Adviser,  the Administrators and the Custodian that
they are actively  taking steps to address the Year 2000 Problem with respect to
the computer  systems  that they use and to obtain  assurances  that  comparable
steps are being taken by the Fund's other major service  providers.  While there
can be no  assurance  that  the  Fund's  service  providers  will be  Year  2000
compliant,  the Fund's service providers expect that their plans to be compliant
will be achieved.

                                       6

<PAGE>

INVESTMENT LIMITATIONS
- --------------------------------------------------------------------------------
     The Portfolio's  investment  objective and policies  described above may be
changed by the Fund's  Board of  Directors  without  shareholder  approval.  The
investment  limitations  summarized below may not be changed,  however,  without
shareholder  approval.  (A more detailed description of the following investment
limitations  is  contained  in the  Statement of  Additional  Information  under
"Investment Objectives and Policies.")

     The Portfolio may not:

         1. Purchase  securities other than U.S. Treasury bills, notes and other
     obligations  issued or guaranteed by the U.S.  Government,  its agencies or
     instrumentalities, and repurchase agreements relating to such obligations.

         2. Borrow money, except from banks for temporary  purposes,  and except
     for reverse repurchase agreements,  and then in an amount not exceeding 10%
     of the  value of the  Portfolio's  total  assets,  and  only if after  such
     borrowing  there is asset  coverage of at least 300% for all  borrowings of
     the  Portfolio;  or mortgage,  pledge or  hypothecate  its assets except in
     connection  with any such  borrowing and in amounts not in excess of 10% of
     the  value of the  Portfolio's  assets  at the time of such  borrowing;  or
     purchase  portfolio  securities  while  borrowings  in  excess of 5% of the
     Portfolio's net assets are  outstanding.  (This borrowing  provision is not
     for  investment  leverage,  but  solely  to  facilitate  management  of the
     Portfolio  by enabling  the  Portfolio to meet  redemption  requests  where
     liquidation  of  portfolio  securities  is  deemed  to be  inconvenient  or
     disadvantageous.)

         3. Make loans  except  that the  Portfolio  may  purchase  or hold debt
     obligations  in  accordance  with its  investment  objective,  policies and
     limitations,  may enter into repurchase agreements for securities,  and may
     lend  portfolio  securities  against  collateral,  consisting  of  cash  or
     securities which are consistent with the Portfolio's permitted investments,
     which is equal at all times to at least 100% of the value of the securities
     loaned. There is no investment restriction on the amount of securities that
     may be loaned,  except that  payments  received  on such  loans,  including
     amounts  received  during the loan on account of interest on the securities
     loaned, may not (together with all non-qualifying income) exceed 10% of the
     Portfolio's annual gross income (without offset for realized capital gains)
     unless,  in the opinion of counsel to the Fund, such amounts are qualifying
     income  under  federal  income  tax  provisions   applicable  to  regulated
     investment companies.

PURCHASE AND REDEMPTION OF SHARES
- --------------------------------------------------------------------------------

                               PURCHASE PROCEDURES

     GENERAL.  Shares are sold without a sales load on a continuous basis by the
Distributor.  The  Distributor is located at Four Falls Corporate  Center,  West
Conshohocken,  Pennsylvania  19428.  Investors  may purchase  Shares  through an
account  maintained by the investor with his brokerage  firm (an  "Account") and
may  also  purchase  Shares  directly  by  mail or  wire.  The  minimum  initial
investment is $1,000, and the minimum subsequent investment is $100. The Fund in
its sole discretion may accept or reject any order for purchases of Shares.

     All  payments  for initial  and  subsequent  investments  should be in U.S.
dollars. Purchases will be effected at the net asset value next determined after
PFPC, the Fund's transfer agent, has received a purchase order in good order and
the Fund's  custodian  has Federal Funds  immediately  available to it. In those
cases  where  payment  is made by check,  Federal  Funds will  generally  become
available two Business Days after the check is received. A "Business Day" is any
day that both the New York Stock  Exchange (the "NYSE") and the Federal  Reserve
Bank of Philadelphia (the "FRB") are open. On any Business Day, orders which are
accompanied  by Federal  Funds and received by PFPC by 12:00 noon Eastern  Time,
and orders as to which  payment has been  converted  into Federal Funds by 12:00
noon Eastern Time,  will be executed as of 12:00 noon that Business Day.  Orders
which are accompanied by Federal Funds and received by PFPC after

                                       7

<PAGE>

12:00 noon  Eastern  Time but prior to the close of regular  trading on the NYSE
(generally  4:00 p.m.  Eastern  Time),  and orders as to which  payment has been
converted  into  Federal  Funds after 12:00 noon  Eastern  Time but prior to the
close of regular  trading on the NYSE on any Business  Day of the Fund,  will be
executed as of the close of regular trading on the NYSE on that Business Day but
will not be entitled to receive dividends  declared on such Business Day. Orders
which are  accompanied by Federal Funds and received by the Fund as of the close
of regular trading on the NYSE or later, and orders as to which payment has been
converted  to Federal  Funds as of the close of  regular  trading on the NYSE or
later on a Business  Day will be  processed as of 12:00 noon Eastern Time on the
following Business Day.

     PURCHASES  THROUGH AN ACCOUNT.  Purchases of Shares may be effected through
an  investor's  Account  with  his  broker  through  procedures  established  in
connection  with the  requirements  of Accounts at such  broker.  In such event,
beneficial  ownership  of Shares  will be  recorded  by the  broker  and will be
reflected in the Account statements provided by the broker to such investors.  A
broker may impose minimum investment Account requirements. Even if a broker does
not impose a sales charge for purchases of Shares,  depending on the terms of an
investor's Account with his broker, the broker may charge investors Account fees
for automatic investment and other services provided to the Account. Information
concerning Account requirements, services and charges should be obtained from an
investor's  broker,  and this Prospectus  should be read in conjunction with any
information received from a broker.

     Shareholders  whose  shares are held in the street name account of a broker
and who desire to transfer  such  shares to the street  name  account of another
broker should contact their current broker.

     A broker may offer investors  maintaining  Accounts the ability to purchase
Shares under an automatic purchase program (a "Purchase Program") established by
a participating  broker. An investor who participates in a Purchase Program will
have his "free-credit"  cash balances in his Account  automatically  invested in
Shares. The frequency of investments and the minimum investment requirement will
be established by the broker and the Fund. In addition, the broker may require a
minimum  amount of cash  and/or  securities  to be  deposited  in an Account for
participants in its Purchase Program. The description of the particular broker's
Purchase  Program  should be read for details,  and any inquiries  concerning an
Account under a Purchase Program should be directed to the broker.

     If a broker makes  special  arrangements  under which orders for Shares are
received by PFPC prior to 12:00 noon  Eastern  Time,  and the broker  guarantees
that  payment  for such Shares will be made in  available  Federal  Funds to the
Fund's  custodian prior to the close of regular trading on the NYSE, on the same
day, such purchase  orders will be effective and Shares will be purchased at the
offering  price in effect as of 12:00 noon Eastern Time on the date the purchase
order is received by PFPC.

     DIRECT PURCHASES. An investor may also make direct investments in Shares at
any time  through any broker that has entered into a dealer  agreement  with the
Distributor (a "Dealer").  An investor may make an initial investment by mail by
fully  completing  and  signing  an  application  obtained  from  a  Dealer  (an
"Application")  and  mailing  it,  together  with a check  payable  to  "Bedford
Government  Obligations  Money Market" to Bedford  Government  Obligations Money
Market  Portfolio,  c/o PFPC,  P.O. Box 8950,  Wilmington,  Delaware  19899.  An
Application  will be returned to the investor unless it contains the name of the
Dealer from whom it was  obtained.  Subsequent  purchases  may be made through a
Dealer or by forwarding  payment to the Fund's  transfer  agent at the foregoing
address.

     Provided  that the  investment  is at least  $2,500,  an investor  may also
purchase  Shares by having his bank or Dealer wire  Federal  Funds to the Fund's
custodian,  PNC Bank. An investor's  bank or Dealer may impose a charge for this
service.  The Fund does not currently  charge for effecting  wire  transfers but
reserves the right to do so in the future.  In order to ensure prompt receipt of
an investor's Federal Funds wire for an initial investment, it is important that
an investor follows these steps:

         A. Telephone the Fund's transfer agent, PFPC,  toll-free (800) 533-7719
     (in Delaware call collect (302) 791-1196),  and provide your name, address,
     telephone number, Social Security or Tax Identification Number,

                                       8

<PAGE>

     the amount  being  wired,  and by which bank  or  Dealer.  PFPC  will  then
     provide an investor with a Fund account  number.  (Investors  with existing
     accounts should also notify PFPC prior to wiring funds.)

         B. Instruct your bank or Dealer to wire the specified amount,  together
     with your assigned account number, to PFPC's account with PNC Bank:

                  PNC Bank, N.A., Philadelphia, PA
                  ABA-0310-0005-3
                  FROM: (name of investor)
                  ACCOUNT NUMBER: (investor's account number with the Portfolio)
                  FOR PURCHASE OF: (name of Portfolio)
                  AMOUNT: (amount to be invested)

         C. Fully complete and sign the  Application  and mail it to the address
     shown thereon.  PFPC will not process initial purchases until it receives a
     fully completed and signed Application.

     For subsequent investments, an investor should follow steps A and B above.

     RETIREMENT  PLANS.  Shares may be purchased in conjunction  with individual
retirement  accounts ("IRAs") and rollover IRAs where PFPC Trust Company acts as
custodian.  For further  information as to applications and annual fees, contact
the Distributor or your broker.  To determine whether the benefits of an IRA are
available and/or appropriate, a shareholder should consult with a tax adviser.

                              REDEMPTION PROCEDURES

     Redemption  orders  are  effected  at the net asset  value  per share  next
determined  after  receipt of the order in proper  form by the  Fund's  transfer
agent, PFPC. Investors may redeem all or some of their Shares in accordance with
one of the procedures described below.

     REDEMPTION  OF SHARES IN AN ACCOUNT.  An  investor  who  beneficially  owns
Shares  through an Account may redeem Shares in his Account in  accordance  with
instructions and limitations pertaining to his Account by contacting his broker.
If such notice is received by PFPC by 12:00 noon  Eastern  Time on any  Business
Day, the redemption will be effective as of 12:00 noon Eastern Time on that day.
Payment of the redemption proceeds will be made after 12:00 noon Eastern Time on
the day the redemption is effected,  provided that the Fund's  custodian is open
for  business.  If the  custodian is not open,  payment will be made on the next
bank business day. If the redemption  request is received between 12:00 noon and
the close of regular  trading of the NYSE on a Business Day, the redemption will
be effective as of the close of regular trading of the NYSE on such Business Day
and payment will be made on the next bank business day following  receipt of the
redemption request. If all Shares are redeemed, all accrued but unpaid dividends
on those Shares will be paid with the redemption proceeds.

     An investor's  brokerage firm may also redeem each day a sufficient  number
of Shares to cover  debit  balances  created by  transactions  in the Account or
instructions  for cash  disbursements.  Shares  will be redeemed on the same day
that a transaction occurs that results in such a debit balance or charge.

     Each  brokerage  firm  reserves  the right to waive or modify  criteria for
participation in an Account or to terminate  participation in an Account for any
reason.

     REDEMPTION  OF SHARES  OWNED  DIRECTLY.  A direct  investor  may redeem any
number of Shares by sending a written request, to Bedford Government Obligations
Money Market, c/o PFPC, P.O. Box 8950,  Wilmington,  Delaware 19899.  Redemption
requests must be signed by each shareholder in the same manner as the Shares are
registered. Redemption requests for joint accounts require the signature of each
joint owner.  On redemption  requests of $5,000 or more,  each signature must be
guaranteed. A signature guarantee may be obtained from a domestic bank or trust

                                       9

<PAGE>

company,  broker,  dealer,  clearing  agency  or  savings  association  who  are
participants  in a  medallion  program  recognized  by the  Securities  Transfer
Association.  The three recognized  medallion  programs are Securities  Transfer
Agents Medallion Program (STAMP),  Stock Exchanges  Medallion Program (SEMP) and
New York Exchange,  Inc. Medallion Signature Program (MSP). Signature guarantees
that are not part of these programs will not be accepted.

     Direct investors may redeem Shares without charge by telephone if they have
completed  and  returned  an  account  application  containing  the  appropriate
telephone  election.  To add a  telephone  option to an  existing  account  that
previously did not provide for this option, a Telephone  Authorization Form must
be filed with PFPC.  This form is available  from PFPC.  Once this  election has
been made, the  shareholder  may simply contact PFPC by telephone to request the
redemption by calling  (888)  261-4073.  Neither the Fund,  the  Portfolio,  the
Distributor,  PFPC  nor any  other  Fund  agent  will be  liable  for any  loss,
liability,  cost or expense for following the procedures  described below or for
following instructions communicated by telephone that they reasonably believe to
be genuine.

     The Fund's telephone transaction procedures include the following measures:
(1)  requiring  the  appropriate  telephone  transaction  privilege  forms;  (2)
requiring  the caller to provide  the names of the account  owners,  the account
social  security  number and name of the portfolio,  all of which must match the
Fund's records;  (3) requiring the Fund's service  representative  to complete a
telephone  transaction  form,  listing  all of the above  caller  identification
information; (4) requiring that redemption proceeds be sent only by check to the
account owners of record at the address of record, or by wire only to the owners
of record at the bank account of record; (5) sending a written  confirmation for
each  telephone  transaction  to the  owners of record at the  address of record
within  five  (5)  business  days of the  call;  and (6)  maintaining  tapes  of
telephone  transactions for six months, if the Fund elects to record shareholder
telephone  transactions.  For accounts held of record by  broker-dealers  (other
than the Distributor),  financial  institutions,  securities dealers,  financial
planners  or  other  industry   professionals,   additional   documentation   or
information  regarding the scope of a caller's  authority is required.  Finally,
for telephone  transactions  in accounts held  jointly,  additional  information
regarding other account holders is required.  Telephone transactions will not be
permitted  in  connection  with  IRA or other  retirement  plan  accounts  or by
attorney-in-fact under power of attorney.

     Proceeds of a telephone  redemption  request  will be mailed by check to an
investor's  registered  address unless he has  designated in his  Application or
Telephone  Authorization Form that such proceeds are to be sent by wire transfer
to a specified  checking or savings account.  If proceeds are to be sent by wire
transfer,  a telephone redemption request received prior to the close of regular
trading  of the NYSE  will  result in  redemption  proceeds  being  wired to the
investor's  bank account on the next bank business  day. The minimum  redemption
for proceeds sent by wire  transfer is $2,500.  There is no maximum for proceeds
sent by wire transfer.  The Fund may modify this redemption  service at any time
or charge a service fee upon prior  notice to  shareholders,  although no fee is
currently contemplated.

     REDEMPTION  BY CHECK.  Upon  request,  the Fund  will  provide  any  direct
investor  and any investor who does not have check  writing  privileges  for his
Account with forms of drafts  ("checks")  payable through PNC Bank. These checks
may be made  payable to the order of anyone.  The  minimum  amount of a check is
$100;  however, a broker may establish a higher minimum.  An investor wishing to
use this check writing  redemption  procedure should complete specimen signature
cards (available from PFPC), and then forward such signature cards to PFPC. PFPC
will then  arrange for the checks to be honored by PNC Bank.  Investors  who own
Shares  through an Account  should  contact their  brokers for signature  cards.
Investors  of joint  accounts  may elect to have  checks  honored  with a single
signature.  Check  redemptions  will be subject to PNC  Bank's  rules  governing
checks. An investor will be able to stop payment on a check redemption. The Fund
or PNC Bank may terminate this redemption service at any time, and neither shall
incur any  liability  for honoring  checks,  for  effecting  redemptions  to pay
checks, or for returning checks which have not been accepted.

     When a check is  presented  to PNC Bank for  clearance,  PNC  Bank,  as the
investor's  agent, will cause the Fund to redeem a sufficient number of full and
fractional  Shares owned by the investor to cover the amount of the check.  This
procedure  enables the investor to continue to receive dividends on those Shares
representing  the amount being redeemed by check until such time as the check is
presented to PNC Bank. Pursuant to rules under the 1940 Act, checks

                                       10

<PAGE>

may  not be  presented  for  cash  payment  at the  offices  of PNC  Bank.  This
limitation  does not affect  checks  used for the  payment of bills or cashed at
other banks.

     ADDITIONAL  REDEMPTION  INFORMATION.  The Fund ordinarily will make payment
for all Shares  redeemed within seven days after receipt by PFPC of a redemption
request in proper form.  Although the Fund will redeem Shares purchased by check
before the check clears, payment of the redemption proceeds may be delayed for a
period of up to fifteen days after their purchase,  pending a determination that
the check has cleared. This procedure does not apply to Shares purchased by wire
payment.  Investors should consider  purchasing Shares using a certified or bank
check or  money  order  if they  anticipate  an  immediate  need for  redemption
proceeds.

     The Fund imposes no charge when Shares are redeemed.  The Fund reserves the
right to redeem any account in the Class involuntarily,  on thirty days' notice,
if such account falls below $500 and during such 30-day notice period the amount
invested in such account is not  increased to at least $500.  Payment for Shares
redeemed may be postponed  or the right of  redemption  suspended as provided by
the rules of the Securities and Exchange Commission.

NET ASSET VALUE
- --------------------------------------------------------------------------------
     The net  asset  value  per  share of each  class of the  Portfolio  for the
purpose of pricing purchase and redemption  orders is determined twice each day,
once as of 12:00 noon Eastern  Time and once as of the close of regular  trading
on the NYSE on each  weekday,  with the  exception  of those  holidays  on which
either the NYSE or the FRB is closed.  Currently, the NYSE is closed on weekends
and the  customary  national  business  holidays of New Year's Day,  Dr.  Martin
Luther King, Jr. Day, Presidents' Day, Good Friday,  Memorial Day,  Independence
Day, Labor Day,  Thanksgiving  Day and Christmas Day and the preceding Friday or
subsequent Monday when one of these holidays falls on a Saturday or Sunday.  The
FRB is currently  closed on weekends and the same  holidays on which the NYSE is
closed, as well as Veterans' Day and Columbus Day. The net asset value per share
of each class is calculated by adding the value of the proportionate interest of
the class in the securities, cash and other assets of the Portfolio, subtracting
the actual and accrued  liabilities of such class and dividing the result by the
number of outstanding shares of the class. The net asset value per share of each
class of the  Portfolio is determined  independently  of any of the Fund's other
classes.

     The Fund seeks to maintain for the Portfolio a net asset value of $1.00 per
share for  purposes  of  purchases  and  redemptions  and values  its  portfolio
securities on the basis of the amortized  cost method of valuation  described in
the Statement of Additional Information under the heading "Valuation of Shares."
There can be no assurance that net asset value per share will not vary.

     With the  approval  of the  Board of  Directors,  the  Portfolio  may use a
pricing service, bank or broker-dealer  experienced in such matters to value the
Portfolio's  securities.  A more  detailed  discussion  of net  asset  value and
security valuation is contained in the Statement of Additional Information.

MANAGEMENT
- --------------------------------------------------------------------------------

BOARD OF DIRECTORS

     The business and affairs of the Fund and  Portfolio  are managed  under the
direction  of the Fund's  Board of  Directors.  The Fund  currently  operates or
proposes to operate seventeen investment portfolios.  The Government Obligations
Money Market Portfolio is one of these portfolios.

INVESTMENT ADVISER

     BIMC,  an indirect  majority-owned  subsidiary  of PNC Bank,  serves as the
investment adviser for the Portfolio. BIMC has its principal offices at Bellevue
Park Corporate Center, 400 Bellevue Parkway, Wilmington, Delaware 19809. PNC

                                       11

<PAGE>

Bank and its  subsidiaries  currently  manage over $45.9  billion of assets,  of
which  approximately  $31.4 billion are mutual funds.  PNC Bank, a national bank
whose  principal   business   address  is  1600  Market  Street,   Philadelphia,
Pennsylvania  19103,  is a  wholly-owned  subsidiary  of PNC  Bancorp  Inc.  PNC
Bancorp,  Inc. is a bank holding  company and a  wholly-owned  subsidiary of PNC
Bank Corp., a multi-bank holding company.

     As investment  adviser to the Portfolio,  BIMC manages the Portfolio and is
responsible  for all  purchases and sales of portfolio  securities.  In entering
into  transactions  for the Portfolio with a broker,  BIMC may take into account
the sale by such broker of shares of the Fund,  subject to the  requirements  of
best  execution.  The  agreement  between  BIMC  and  RBB  with  respect  to the
Government  Obligations Money Market Portfolio  provides for BIMC to also assist
generally in supervising the operations of such  Portfolio,  and to maintain the
Portfolio's financial account and records. These administrative responsibilities
have been delegated to PFPC, as described below.

     For the services  provided to and expenses assumed by it for the benefit of
the Portfolio,  BIMC is entitled to receive the following  fees,  computed daily
and payable monthly based on the Portfolio's  average daily net assets:  .45% of
the first $250 million; .40% of the next $250 million; and .35% of net assets in
excess of $500 million.  BIMC may in its  discretion  from time to time agree to
waive voluntarily all or any portion of its advisory fee for the Portfolio.

     For the Fund's  fiscal year ended August 31, 1998 the Fund paid  investment
advisory fees aggregating  .30% of the average net assets of the Portfolio.  For
that same year, BIMC waived approximately .12% of the advisory fees payable with
respect to the Portfolio.

     PNC Bank was formerly  sub-adviser to the Portfolio and provided  research,
credit analysis and recommendations with respect to the Portfolio's  investments
and supplied  certain  computer  facilities,  personnel and other services.  The
facilities,  personnel,  services and related  expenses have been transferred to
BIMC and in return,  BIMC's  obligation to pay a portion of the sub-advisory fee
to PNC Bank has been  terminated.  For its sub-advisory  services,  PNC Bank was
entitled to receive from BIMC an amount equal to 75% of the investment  advisory
fee paid by the Portfolio to BIMC.  Such  sub-advisory  fees paid by BIMC to PNC
Bank had no effect on the  investment  advisory fees payable by the Portfolio to
BIMC.  The services  provided by BIMC and the fees payable by the  Portfolio for
these services are described further in the Statement of Additional  Information
under "Management of the Company."

ADMINISTRATOR

     Pursuant  to its  advisory  agreement  with the Fund  with  respect  to the
Government Obligations Portfolio,  BIMC provides  administrative services to the
Portfolio,  and is entitled to an administration fee, computed daily and payable
monthly at .10% of average daily net assets of the Portfolio. BIMC has delegated
to PFPC all of its accounting and administrative obligations under such advisory
agreement.  The Fund has agreed to pay directly to PFPC the fees for  accounting
and administrative  services to the Government  Obligations Portfolio which PFPC
would have received  directly from BIMC.  Such  arrangement has no effect on the
total advisory and administrative fees payable by such Portfolio to BIMC. PFPC's
principal business address is 400 Bellevue Parkway, Wilmington, Delaware 19809.

TRANSFER AGENT, DIVIDEND DISBURSING AGENT AND CUSTODIAN

     PFPC Trust Company, an indirect  wholly-owned subsidiary of PNC Bank Corp.,
will succeed PNC Bank, National Association ("PNC Bank") as the Fund's custodian
pursuant to an assignment. PNC Bank will continue to provide certain services to
PFPC Trust  Company.  PFPC  serves as the  Fund's  transfer  agent and  dividend
disbursing  agent.  The  principal  offices of PFPC are located at 400  Bellevue
Parkway,  Wilmington,  Delaware 19809. PFPC may enter into shareholder servicing
agreements  with  registered   broker-dealers   who  have  entered  into  dealer
agreements  with the  Distributor  ("Authorized  Dealers")  for the provision of
certain shareholder support services to customers of such Authorized Dealers who
are shareholders of the Fund. The services  provided and the fees payable by the
Fund for these services are described in the Statement of Additional Information
under "Investment Advisory, Distribution and Servicing Arrangements."

                                       12

<PAGE>

DISTRIBUTOR

     Provident  Distributors,  Inc., with a principal  business  address at Four
Falls  Corporate  Center,   West  Conshohocken,   Pennsylvania  19428,  acts  as
distributor  of the Shares  pursuant to a distribution  agreement  dated May 29,
1998 (the "Distribution Agreement").

EXPENSES

     The expenses of the  Portfolio  are  deducted  from the total income of the
Portfolio  before  dividends are paid. Any general expenses of the Fund that are
not readily  identifiable as belonging to a particular  investment  portfolio of
the Fund will be allocated  among all  investment  portfolios  of the Fund based
upon the relative net assets of the investment portfolios.  The Bedford Class of
the Fund pays its own  distribution  fees,  and may pay a  different  share than
other classes of the Fund of other  expenses  (excluding  advisory and custodial
fees) if these  expenses  are  actually  incurred in a  different  amount by the
Bedford Class or if it received different services.

     The  investment  adviser may assume  expenses of the Portfolio from time to
time.  In certain  circumstances,  it may assume such  expenses on the condition
that it is  reimbursed  by the  Portfolio for such amounts prior to the end of a
fiscal  year.  In such event,  the  reimbursement  of such amounts will have the
effect of increasing  the  Portfolio's  expense  ratio and of lowering  yield to
investors.

     For the Fund's fiscal year ended August 31, 1998, the Fund's total expenses
were  1.10% of average  net assets  with  respect  to the  Bedford  Class of the
Portfolio (not taking into account waivers and reimbursements of .125%).

DISTRIBUTION OF SHARES
- --------------------------------------------------------------------------------
     The Board of  Directors of the Fund  approved and adopted the  Distribution
Agreement and separate Plan of Distribution  for the Class (the "Plan") pursuant
to Rule 12b-1 under the 1940 Act. Under the Plan, the Distributor is entitled to
receive  from the Class a  distribution  fee,  which is  accrued  daily and paid
monthly, of up to .65% on an annualized basis of the average daily net assets of
the Class.  Under the  Distribution  Agreement,  the  Distributor  has agreed to
accept compensation for its services thereunder and under the Plan in the amount
of .60% of the average daily net assets of the Class on an  annualized  basis in
any year.  The actual  amount of such  compensation  is agreed upon from time to
time by the Fund's  Board of  Directors  and the  Distributor.  Pursuant  to the
conditions  of an  exemptive  order  granted  by  the  Securities  and  Exchange
Commission,  the  Distributor  has  agreed to waive its fee with  respect to the
Class on any day to the extent  necessary  to assure that the fee required to be
accrued by such  Class does not exceed the income of such Class on that day.  In
addition, the Distributor may, in its discretion, voluntarily waive from time to
time all or any portion of its distribution fee.

     Under  the  Distribution  Agreement  and  the  Plan,  the  Distributor  may
reallocate  an  amount  up to  the  full  fee  that  it  receives  to  financial
institutions,  including  Dealers,  based upon the aggregate  investment amounts
maintained by and services  provided to  shareholders  of the Class  serviced by
such financial  institutions.  The  Distributor  may also reimburse  Dealers for
other  expenses  incurred  in the  promotion  of the  sale of Fund  shares.  The
Distributor and/or Dealers pay for the cost of printing (excluding  typesetting)
and mailing to prospective  investors  prospectuses and other materials relating
to the Fund as well as for related  direct  mail,  advertising  and  promotional
expenses.

     The Plan obligates the Fund,  during the period it is in effect,  to accrue
and pay to the  Distributor  on behalf of the Class the fee  agreed to under the
Distribution  Agreement.  Payments  under  the  Plan are not  based on  expenses
actually  incurred by the Distributor  and the payments may exceed  distribution
expenses actually incurred.

                                       13

<PAGE>

DIVIDENDS AND DISTRIBUTIONS
- --------------------------------------------------------------------------------
     The Fund will distribute substantially all of the net investment income and
net  realized  capital  gains,  if  any,  of the  Portfolio  to the  Portfolio's
shareholders.  All  distributions  are reinvested in the form of additional full
and fractional Shares unless a shareholder elects otherwise.

     The net investment income (not including any net short-term  capital gains)
earned by the Portfolio will be declared as a dividend on a daily basis and paid
monthly.  Dividends are payable to shareholders of record  immediately  prior to
the  determination of net asset value made as of the close of regular trading on
the NYSE.  Net short-term  capital  gains,  if any, will be distributed at least
annually.

TAXES
- --------------------------------------------------------------------------------
     Distributions  from the Government  Obligations Money Market Portfolio will
generally be taxable to shareholders.  It is expected that all, or substantially
all, of these distributions will consist of ordinary income. You will be subject
to income tax on these distributions regardless whether they are paid in cash or
reinvested in additional shares. The one major exception to these tax principles
is that  distributions  on shares held in an IRA (or other  tax-qualified  plan)
will not be currently taxable.

     The  foregoing  is only a summary of certain tax  considerations  under the
current law,  which may be subject to change in the future.  You should  consult
your tax adviser for further information regarding federal,  state, local and/or
foreign tax consequences relevant to your specific situation.

DESCRIPTION OF SHARES
- --------------------------------------------------------------------------------
     The Fund has  authorized  capital of thirty billion shares of Common Stock,
$.001 par  value  per  share,  of which  18.326  billion  shares  are  currently
classified  into 97  different  classes  of Common  Stock (see  "Description  of
Shares" in the Statement of Additional Information).

     The Fund offers  multiple  classes of shares in the Portfolio to expand its
marketing  alternatives  and to  broaden  its  range of  services  to  different
investors.  The expenses of the various classes within this Portfolio vary based
upon the services provided,  which may affect performance.  Each class of Common
Stock of the  Fund has a  separate  Rule  12b-1  distribution  plan.  Under  the
Distribution  Agreements  entered into with the Distributor and pursuant to each
of the  distribution  plans,  the  Distributor  is entitled to receive from each
class  as  compensation  for  distribution  services  provided  to that  class a
distribution  fee based on average daily net assets.  A salesperson or any other
person  entitled to receive  compensation  for servicing Fund shares may receive
different  compensation  with respect to different classes in a Portfolio of the
Fund. An investor may contact the Fund's  Distributor by calling  1-800-888-9723
to request more information concerning other classes available.

     THIS  PROSPECTUS AND THE STATEMENT OF ADDITIONAL  INFORMATION  INCORPORATED
HEREIN RELATE PRIMARILY TO THE BEDFORD CLASS OF THE GOVERNMENT OBLIGATIONS MONEY
MARKET  PORTFOLIO  AND DESCRIBE  ONLY THE  INVESTMENT  OBJECTIVE  AND  POLICIES,
OPERATIONS, CONTRACTS AND OTHER MATTERS RELATING TO THIS PORTFOLIO.

     Each  share that  represents  an  interest  in the  Portfolio  has an equal
proportionate  interest in the assets belonging to the Portfolio with each other
share that  represents  an interest in the  Portfolio,  even where a share has a
different class  designation than another share  representing an interest in the
Portfolio.  Shares of the Fund do not have preemptive or conversion rights. When
issued for payment as described in this  Prospectus,  Shares of the Fund will be
fully paid and non-assessable.

                                       14

<PAGE>

     The Fund currently does not intend to hold annual  meetings of shareholders
except  as  required  by the 1940 Act or other  applicable  law.  The law  under
certain circumstances provides shareholders with the right to call for a meeting
of shareholders to consider the removal of one or more directors.  To the extent
required  by law,  the Fund will  assist in  shareholder  communication  in such
matters.

     Holders of shares of the  Portfolio  will vote in the  aggregate and not by
class  on  all  matters,  except  where  otherwise  required  by  law.  Further,
shareholders of all investment portfolios of the Fund will vote in the aggregate
and not by portfolio  except as  otherwise  required by law or when the Board of
Directors determines that the matter to be voted upon affects only the interests
of the shareholders of a particular investment portfolio.  (See the Statement of
Additional Information under "Additional Information Concerning Fund Shares" for
examples when the 1940 Act requires voting by investment portfolio or by class.)
Shareholders  of the Fund are  entitled  to one vote for each  full  share  held
(irrespective of class or portfolio) and fractional votes for fractional  shares
held.  Voting rights are not cumulative  and,  accordingly,  the holders of more
than 50% of the  aggregate  shares of Common  Stock of the Fund may elect all of
the directors.

     As of November 16, 1998, to the Fund's knowledge,  no person held of record
or  beneficially  25% or more of the  outstanding  shares of all  classes of the
Fund.

OTHER INFORMATION
- --------------------------------------------------------------------------------

REPORTS AND INQUIRIES

     Shareholders  will receive  unaudited  semi-annual  reports  describing the
Fund's  investment   operations  and  annual  financial  statements  audited  by
independent accountants.  Shareholder inquiries should be addressed to PFPC, the
Fund's transfer agent,  Bellevue Park Corporate  Center,  400 Bellevue  Parkway,
Wilmington,  Delaware 19809,  toll-free (800) 533-7719 (in Delaware call collect
(302) 791-1196).

                                       15

<PAGE>

NO  PERSON  HAS  BEEN  AUTHORIZED  TO  GIVE  ANY  INFORMATION  OR  TO  MAKE  ANY
REPRESENTATIONS  NOT CONTAINED IN THIS PROSPECTUS OR IN THE FUND'S  STATEMENT OF
ADDITIONAL INFORMATION  INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE
OFFERING MADE BY THIS  PROSPECTUS  AND, IF GIVEN OR MADE,  SUCH  INFORMATION  OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE FUND OR
ITS DISTRIBUTOR.  THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY THE FUND OR
BY THE  DISTRIBUTOR IN ANY  JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY
BE MADE.


                               -----------------
                                    CONTENTS

                                                                          PAGE
Introduction..........................................................      2
Financial Highlights..................................................      3
Investment Objective and Policies.....................................      5
Year 2000.............................................................      6
Investment Limitations................................................      7
Purchase and Redemption of Shares.....................................      7
Net Asset Value.......................................................     11
Management............................................................     11
Distribution of Shares................................................     13
Dividends and Distributions...........................................     14
Taxes.................................................................     14
Description of Shares.................................................     14
Other Information.....................................................     15

INVESTMENT ADVISER
BlackRock Institutional Management Corporation
Wilmington, Delaware

DISTRIBUTOR
Provident Distributors, Inc.
West Conshohocken, Pennsylvania

CUSTODIAN
PFPC Trust Company
Wilmington, Delaware

ADMINISTRATOR AND TRANSFER AGENT
PFPC Inc.
Wilmington, Delaware

COUNSEL
Drinker Biddle & Reath LLP
Philadelphia, Pennsylvania

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers LLP
Philadelphia, Pennsylvania

<PAGE>
================================================================================

PROSPECTUS
THE BEDFORD FAMILY


MONEY MARKET PORTFOLIO
- --------------------------------------------------------------------------------
MUNICIPAL MONEY MARKET PORTFOLIO
- --------------------------------------------------------------------------------
GOVERNMENT OBLIGATIONS
MONEY MARKET PORTFOLIO
- --------------------------------------------------------------------------------


DECEMBER 29, 1998

================================================================================

<PAGE>

                               THE BEDFORD FAMILY
                                       OF
                               THE RBB FUND, INC.

     The three  classes of common  stock  (each,  a "Bedford  Class") of The RBB
Fund, Inc. (the "Fund"), an open-end management  investment company,  offered by
this  Prospectus  represent  interests in a taxable  money market  portfolio,  a
municipal money market portfolio and a U.S. Government  obligations money market
portfolio  (together,  the  "Portfolios").  The  investment  objectives  of each
investment portfolio described in this Prospectus are as follows:

     MONEY MARKET  PORTFOLIO  -- to provide as high a level of current  interest
income as is consistent with  maintaining  liquidity and stability of principal.
It seeks to achieve such  objective by investing in a  diversified  portfolio of
U.S. dollar-denominated money market instruments.

     MUNICIPAL  MONEY MARKET  PORTFOLIO -- to provide as high a level of current
interest  income  exempt  from  federal  income  taxes  as  is  consistent  with
maintaining  liquidity  and  stability  of  principal.  It seeks to achieve such
objective  by  investing  substantially  all  of  its  assets  in a  diversified
portfolio of  short-term  Municipal  Obligations.  "Municipal  Obligations"  are
obligations issued by or on behalf of states, territories and possessions of the
United  States,  the  District of  Columbia  and their  political  subdivisions,
agencies,  instrumentalities  and  authorities.  During periods of normal market
conditions,  at least 80% of the net assets of the Portfolio will be invested in
Municipal Obligations,  the interest on which is exempt from the regular federal
income tax but which may  constitute an item of tax  preference  for purposes of
the federal alternative minimum tax.

     GOVERNMENT OBLIGATIONS MONEY MARKET PORTFOLIO -- to provide as high a level
of current  interest  income as is  consistent  with  maintaining  liquidity and
stability  of  principal.  It seeks to achieve  such  objective  by investing in
short-term U.S. Treasury bills, notes and other obligations issued or guaranteed
by the U.S.  Government  or its agencies or  instrumentalities,  and  repurchase
agreements relating to such obligations.

     SHARES OF THE FUND ARE NOT DEPOSITS OR  OBLIGATIONS  OF, OR  GUARANTEED  OR
ENDORSED BY PNC BANK, NATIONAL ASSOCIATION, PFPC TRUST COMPANY OR ANY OTHER BANK
AND  SHARES  ARE  NOT  FEDERALLY   INSURED  BY  THE  FEDERAL  DEPOSIT  INSURANCE
CORPORATION,  THE FEDERAL  RESERVE  BOARD,  OR ANY OTHER AGENCY.  INVESTMENTS IN
SHARES OF THE FUND INVOLVE  INVESTMENT  RISKS,  INCLUDING  THE POSSIBLE  LOSS OF
PRINCIPAL.  THERE  CAN BE NO  ASSURANCE  THAT  THE  PORTFOLIOS  WILL  BE ABLE TO
MAINTAIN A STABLE NET ASSET VALUE OF $1.00 PER SHARE.

     BlackRock Institutional Management Corporation serves as investment adviser
for the  Portfolios,  PFPC Trust  Company,  serves as custodian for the Fund and
PFPC Inc. serves as administrator and transfer and dividend disbursing agent for
the Fund. Provident Distributors, Inc. acts as distributor for the Fund.

     This Prospectus  contains concise  information that a prospective  investor
needs to know before investing. Please keep it for future reference. A Statement
of  Additional  Information,  dated  December 29, 1998,  has been filed with the
Securities  and Exchange  Commission  and is  incorporated  by reference in this
Prospectus.  It may be  obtained  upon  request  free of charge from the Fund by
calling (800) 430-9618.  The Prospectus and Statement of Additional  Information
are also available for reference, along with other related materials, on the SEC
Internet Website (http://www.sec.gov).
- --------------------------------------------------------------------------------
THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THIS
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------

PROSPECTUS                                                     December 29, 1998

<PAGE>

INTRODUCTION
- --------------------------------------------------------------------------------
     The  RBB  Fund,  Inc.  is  an  open-end   management   investment   company
incorporated  under the laws of the State of Maryland on February 29, 1988.  The
Fund  is  currently   operating  or  proposing  to  operate  seventeen  separate
investment  portfolios.   Each  of  the  three  classes  of  the  Fund's  shares
(collectively,  the  "Bedford  Shares" or "Shares")  offered by this  Prospectus
represents interests in one of the following of such investment portfolios:  the
Money Market Portfolio,  the Municipal Money Market Portfolio and the Government
Obligations Money Market Portfolio.

     The MONEY MARKET PORTFOLIO'S  investment  objective is to provide as high a
level of current interest income as is consistent with maintaining liquidity and
stability of  principal.  It seeks to achieve  such  objective by investing in a
diversified portfolio of U.S.  dollar-denominated money market instruments which
meet certain ratings  criteria and present minimal credit risks. In pursuing its
investment  objective,  the Money Market  Portfolio  invests in a broad range of
government,  bank and commercial  obligations that may be available in the money
markets.

     The MUNICIPAL MONEY MARKET PORTFOLIO'S  investment  objective is to provide
as high a level of current  interest  income exempt from federal income taxes as
is consistent with maintaining liquidity and stability of principal.  To achieve
this objective,  the Municipal Money Market Portfolio invests  substantially all
of its assets in a  diversified  portfolio of short-term  Municipal  Obligations
which meet certain  ratings  criteria and present  minimal credit risks.  During
periods  of normal  market  conditions,  at least  80% of the net  assets of the
Portfolio  will be invested in Municipal  Obligations,  the interest on which is
exempt from the regular  federal  income tax but which may constitute an item of
tax preference for purposes of the federal alternative minimum tax.

     The GOVERNMENT OBLIGATIONS MONEY MARKET PORTFOLIO'S investment objective is
to provide  as high a level of current  interest  income as is  consistent  with
maintaining liquidity and stability of principal. To achieve its objective,  the
Portfolio invests exclusively in short-term U.S. Treasury bills, notes and other
obligations  issued or  guaranteed  by the U.S.  Government  or its  agencies or
instrumentalities,  and  enters  into  repurchase  agreements  relating  to such
obligations.

     Each of the  Portfolios  seeks to  maintain a net asset  value of $1.00 per
share;  however,  there can be no assurance that the Portfolios  will be able to
maintain a stable net asset value of $1.00 per share.

     The Portfolios'  investment adviser is BlackRock  Institutional  Management
Corporation  ("BIMC").  PFPC Trust  Company  serves as custodian to the Fund and
PFPC Inc.  ("PFPC")  serves as the  administrator  and the transfer and dividend
disbursing agent to the Fund. Provident  Distributors,  Inc. (the "Distributor")
acts as distributor of the Fund's Shares.

     An investor may purchase  and redeem  Shares of any of the Bedford  Classes
through his broker or by direct  purchases or  redemptions.  See  "Purchase  and
Redemption of Shares."

     An investment in any of the Bedford Shares is subject to certain risks,  as
set forth in detail under  "Investment  Objectives  and Policies." Any or all of
the  Portfolios,  to the  extent  set forth  under  "Investment  Objectives  and
Policies,"  may  engage  in  the  following  investment  practices:  the  use of
repurchase  agreements  and  reverse  repurchase  agreements,  the  purchase  of
mortgage-related  securities,  the purchase of securities on a "when-issued"  or
"forward commitment" basis, the purchase of stand-by commitments and the lending
of securities.  All of these transactions  involve certain special risks, as set
forth under "Investment Objectives and Policies."

                                       2

<PAGE>

FEE TABLE
ANNUAL FUND OPERATING EXPENSES (BEDFORD CLASSES)
     AS A PERCENTAGE OF AVERAGE DAILY NET ASSETS

     The Fee Table below contains a summary of the annual operating  expenses of
the Bedford Classes of the Portfolios based on expenses  incurred for the fiscal
year ended August 31,  1998,  as a percentage  of average  daily net assets.  An
example based on the summary is also shown.
<TABLE>
<CAPTION>
                                                                                                   GOVERNMENT
                                                                                   MUNICIPAL       OBLIGATIONS
                                                               MONEY MARKET      MONEY MARKET      MONEY MARKET
                                                                PORTFOLIO          PORTFOLIO        PORTFOLIO
                                                               ------------      ------------      ------------

<S>                                                                   <C>               <C>             <C> 
Management fees (after waivers)(1) ...........................        .23%              .08%             .30%
12b-1 fees ...................................................        .54               .58              .57
Other Expenses ...............................................        .20               .23             .105
                                                                      ---               ---             ----
Total Fund Operating Expenses (Bedford Classes)
   (after waivers)(1) ........................................        .97%              .89%            .975%
                                                                      ===               ===             ====

<FN>
(1) Management Fees and 12b-1 Fees are based on average daily net assets and are
    calculated  daily and paid  monthly.  Before  waivers  for the Money  Market
    Portfolio, Municipal Money Market Portfolio and Government Obligations Money
    Market   Portfolio,   Management  Fees  would  be  .36%,   .34%,  and  .42%,
    respectively,  and Total Fund Operating Expenses would be 1.10%,  1.15%, and
    1.10%, respectively.
</FN>
</TABLE>

EXAMPLE

     An  investor  would  pay the  following  expenses  on a $1,000  investment,
assuming (1) 5% annual return and (2) redemption at the end of each time period:

                                       1 YEAR   3 YEARS    5 YEARS    10 YEARS
                                       ------   -------    -------    --------
Money Market*                            $10     $31         $54        $119
Municipal Money Market*                  $ 9     $28         $49        $110
Government Obligations Money Market*     $10     $31         $54        $120

* Other classes of these Portfolios are sold with different fees and expenses.

     The Example in the Fee Table assumes that all  dividends and  distributions
are reinvested and that the amounts listed under "Annual Fund Operating Expenses
(Bedford Classes)" remain the same in the years shown. THE EXAMPLE SHOULD NOT BE
CONSIDERED A  REPRESENTATION  OF PAST OR FUTURE EXPENSES AND ACTUAL EXPENSES MAY
BE GREATER OR LESS THAN THOSE SHOWN.  Long-term  Shareholders  may pay more than
the economic  equivalent of the maximum front-end sales charges permitted by the
National Association of Securities Dealers, Inc.

     The Fee Table is  designed  to  assist an  investor  in  understanding  the
various costs and expenses  that an investor in the Bedford  Classes of the Fund
will bear directly or indirectly. (For more complete descriptions of the various
costs and expenses,  see "Management -- Investment Adviser" and "Distribution of
Shares"  below.)  Expense  figures are based on actual costs and fees charged to
each class.  The Fee Table  reflects a voluntary  waiver of Management  Fees for
each  Portfolio.  However,  there can be no assurance that any future waivers of
Management  Fees will not vary from the figures  reflected in the Fee Table.  To
the  extent  that  any  service  providers  assume  additional  expenses  of the
Portfolios,  such  assumption  will have the effect of  lowering  a  Portfolio's
overall expense ratio and increasing its yield to investors.

                                       3

<PAGE>

     From time to time a Portfolio  advertises its "total  return,"  "yield" and
"effective  yield."  TOTAL  RETURN  AND YIELD  FIGURES  ARE BASED ON  HISTORICAL
EARNINGS AND ARE NOT INTENDED TO INDICATE FUTURE  PERFORMANCE.  The "yield" of a
Portfolio  refers to the income generated by an investment in a Portfolio over a
seven-day period (which period will be stated in the advertisement). This income
is then  "annualized." That is, the amount of income generated by the investment
during that week is assumed to be generated  each week over a 52-week period and
is shown as a percentage of the investment.  The "effective yield" is calculated
similarly  but,  when  annualized,  the  income  earned  by an  investment  in a
Portfolio is assumed to be reinvested.  The  "effective  yield" will be slightly
higher  than the  "yield"  because  of the  compounding  effect of this  assumed
reinvestment.  The Municipal Money Market Portfolio's "tax-equivalent yield" may
also be quoted from time to time,  which shows the level of taxable yield needed
to produce an after-tax  equivalent to such Portfolio's  tax-free yield. This is
done by increasing such  Portfolio's  yield  (calculated as above) by the amount
necessary to reflect the payment of federal income tax at a stated tax rate.

     The total  returns  yield of any  investment  is  generally  a function  of
portfolio quality and maturity,  type of investment and operating expenses.  The
total returns yield on Shares of any of the Bedford  Classes will  fluctuate and
is not  necessarily  representative  of  future  results.  Any fees  charged  by
broker/dealers  directly to their  customers in connection  with  investments in
Bedford  Shares are not  reflected in the total  returns  yield of Shares of the
Bedford  Classes,  and such fees,  if  charged,  will  reduce the actual  return
received by shareholders on their investments. The total returns yield on Shares
of the Bedford  Classes may differ from total  returns  yield on shares of other
classes  of the  Fund  that  also  represent  interests  in the  same  Portfolio
depending  on the  allocation  of  expenses  to  each  of the  classes  of  that
Portfolio. See "Expenses."

FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
     The table below sets forth certain  information  concerning  the investment
results of the  Bedford  Classes  representing  interests  in the Money  Market,
Municipal Money Market and Government  Obligations  Money Market  Portfolios for
the periods indicated. The financial data included in this table for each of the
periods  ended August 31, 1994 through  August 31, 1998 are a part of the Fund's
financial  statements  for each of the  Portfolios,  which are  incorporated  by
reference into the Statement of Additional  Information and have been audited by
PricewaterhouseCoopers  LLP  ("PricewaterhouseCoopers"),  the Fund's independent
accountants. The financial data for each of the Portfolios for the periods ended
August 31,  1989,  1990,  1991,  1992 and 1993 are a part of previous  financial
statements audited by PricewaterhouseCoopers.  The financial data should be read
in  conjunction  with  the  financial  statements  and  notes  thereto.  Further
information  about the  performance of the Portfolios is available in the Annual
Report to  Shareholders.  Both the Statement of Additional  Information  and the
Annual  Report to  Shareholders  may be  obtained  free of charge by calling the
telephone number on page 1 of this Prospectus.

                                       4

<PAGE>

                               THE BEDFORD FAMILY

THE RBB FUND, INC. FINANCIAL HIGHLIGHTS (c)
     FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD

<TABLE>
<CAPTION>
                                                                       MONEY MARKET PORTFOLIO
                            ------------------------------------------------------------------------------------------------------
                                                                                                                                 
                              FOR THE      FOR THE     FOR THE      FOR THE      FOR THE      FOR THE      FOR THE      FOR THE   
                            YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED 
                            AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31, 
                               1998         1997         1996         1995         1994         1993         1992         1991    
                            ----------   ----------   ----------   ----------   ----------   ----------   ----------   ---------- 
<S>                          <C>         <C>          <C>           <C>          <C>          <C>          <C>         <C>        
Net asset value,
   beginning of period ..... $   1.00    $     1.00   $     1.00    $   1.00     $   1.00     $   1.00     $   1.00    $   1.00   
                             --------    ----------   ----------    --------     --------     --------     --------    ---------  
Income from investment
   operations:
   Net investment income ...   0.0473        0.0462       0.0469      0.0486       0.0278       0.0243       0.0375       0.0629  
   Net gains on securities
     (both realized
     and unrealized) .......       --            --           --          --           --           --       0.0007           --  
                             --------    ----------   ----------    --------     --------     --------     --------    ---------  
       Total from
         investment
         operations ........   0.0473        0.0462       0.0469      0.0486       0.0278       0.0243       0.0382       0.0629  
                             --------    ----------   ----------    --------     --------     --------     --------    ---------  
Less distributions
   Dividends (from net
     investment income) ....  (0.0473)      (0.0462)     (0.0469)    (0.0486)     (0.0278)     (0.0243)     (0.0375)     (0.0629) 
   Distributions (from
     capital gains) ........       --            --           --          --           --           --      (0.0007)          --  
                             --------    ----------   ----------    --------     --------     --------     --------    ---------  
       Total distributions .  (0.0473)      (0.0462)     (0.0469)    (0.0486)     (0.0278)     (0.0243)     (0.0382)     (0.0629) 
                             --------    ----------   ----------    --------     --------     --------     --------    ---------  
Net asset value,
   end of period ........... $   1.00    $     1.00   $     1.00    $   1.00     $   1.00     $   1.00     $   1.00    $   1.00   
                             ========    ==========   ==========    ========     ========     ========     ========    =========  
Total Return ...............    4.84%         4.72%        4.79%       4.97%        2.81%        2.46%        3.89%        6.48%  
Ratios/Supplemental Data
   Net assets, end of
     period (000) .......... $762,739    $1,392,911   $1,109,334    $935,821     $710,737     $782,153     $736,842     $747,530  
   Ratios of expenses to
     average net assets ....   .97%(a)       .97%(a)      .97%(a)     .96%(a)      .95%(a)      .95%(a)      .95%(a)      .92%(a) 
   Ratios of net investment
     income to average
     net assets ............    4.73%         4.62%        4.69%       4.86%        2.78%        2.43%        3.75%        6.29%  
</TABLE>

<TABLE>
<CAPTION>
                                MONEY MARKET PORTFOLIO
                            ------------------------------
                                          FOR THE PERIOD
                                        SEPTEMBER 30, 1988
                             FOR THE       (COMMENCEMENT 
                            YEAR ENDED   OF OPERATIONS) TO
                            AUGUST 31,       AUGUST 31,
                               1990            1989
                            ----------   -----------------
<S>                          <C>              <C>
Net asset value,
   beginning of period ..... $   1.00         $   1.00
                             --------         --------
Income from investment
   operations:
   Net investment income ...   0.0765           0.0779
   Net gains on securities
     (both realized
     and unrealized) .......       --               --
                             --------         --------
       Total from
         investment
         operations ........   0.0765           0.0779
                             --------         --------
Less distributions
   Dividends (from net
     investment income) ....  (0.0765)         (0.0779)
   Distributions (from
     capital gains) ........       --               --
                             --------         --------
       Total distributions .  (0.0765)         (0.0779)
                             --------         --------
Net asset value,
   end of period ........... $   1.00         $   1.00
                             ========         ========
Total Return ...............    7.92%          8.81%(b)
Ratios/Supplemental Data
   Net assets, end of
     period (000) .......... $709,757         $152,311
   Ratios of expenses to
     average net assets ....   .92%(a)       .93%(a)(b)
   Ratios of net investment
     income to average
     net assets ............    7.65%          8.61%(b)
<FN>
(a) Without  the waiver of advisory  and  administration  fees,  and without the
    reimbursement  of certain  operating  expenses,  the ratios of  expenses  to
    average  net assets for the Money  Market  Portfolio  would have been 1.10%,
    1.12%,  1.14%,  1.17%,  1.16%,  1.19%,  1.20%, 1.17% and 1.16% for the years
    ended August 31, 1998,  1997,  1996,  1995, 1994, 1993, 1992, 1991 and 1990,
    respectively, and 1.27% annualized for the period ended August 31, 1989.

(b) Annualized.

(c) Financial Highlights relate solely to the Bedford Class of shares within the
    Portfolio.
</FN>
</TABLE>

                                       5

<PAGE>

                               THE BEDFORD FAMILY

THE RBB FUND, INC. FINANCIAL HIGHLIGHTS (c)
     FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD

<TABLE>
<CAPTION>
                                                                 MUNICIPAL MONEY MARKET PORTFOLIO                                
                            -----------------------------------------------------------------------------------------------------
                                                                                                                                 
                                                                                                                                 
                                                                                                                                 
                              FOR THE      FOR THE     FOR THE      FOR THE      FOR THE      FOR THE      FOR THE      FOR THE  
                            YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED
                            AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,
                               1998         1997         1996         1995         1994         1993         1992         1991   
                            ----------   ----------   ----------   ----------   ----------   ----------   ----------   ----------
<S>                          <C>          <C>          <C>          <C>          <C>          <C>          <C>          <C>      
Net asset value,
   beginning of period ..... $   1.00     $   1.00     $   1.00     $   1.00     $   1.00     $   1.00     $   1.00     $   1.00 
                             --------     --------     --------     --------     --------     --------     --------     -------- 
Income from investment
   operations:
   Net investment income ...   0.0286       0.0285       0.0288       0.0297       0.0195       0.0195       0.0287       0.0431 
   Net gains on securities
     (both realized
     and unrealized) .......       --           --           --           --           --           --           --           -- 
                             --------     --------     --------     --------     --------     --------     --------     -------- 
       Total from
         investment
         operations ........   0.0286       0.0285       0.0288       0.0297       0.0195       0.0195       0.0287       0.0431 
                             --------     --------     --------     --------     --------     --------     --------     -------- 
Less distributions
   Dividends (from net
     investment income) ....  (0.0286)     (0.0285)     (0.0288)     (0.0297)     (0.0195)     (0.0195)     (0.0287)     (0.0431)
   Distributions (from
     capital gains) ........       --           --           --           --           --           --           --           -- 
                             --------     --------     --------     --------     --------     --------     --------     -------- 
       Total distributions .  (0.0286)     (0.0285)     (0.0288)     (0.0297)     (0.0195)     (0.0195)     (0.0287)     (0.0431)
                             --------     --------     --------     --------     --------     --------     --------     -------- 
Net asset value,
    end of period .......... $   1.00     $   1.00     $   1.00     $   1.00     $   1.00     $   1.00     $   1.00     $   1.00 
                             ========     ========     ========     ========     ========     ========     ========     ======== 
Total Return ...............    2.97%        2.88%        2.92%        3.01%        1.97%        1.96%        2.90%        4.40% 
Ratios/Supplemental Data
   Net assets, end of
     period (000) .......... $147,633     $213,034     $201,940     $198,425     $182,480     $215,577     $176,950     $215,140 
   Ratios of expenses to
     average net assets ....   .89%(a)      .85%(a)      .84%(a)      .82%(a)      .77%(a)      .77%(a)      .77%(a)      .74%(a)
   Ratios of net investment
     income to average
     net assets ............    2.86%        2.85%        2.88%        2.97%        1.95%        1.95%        2.87%        4.31% 
</TABLE>

<TABLE>
<CAPTION>
                            MUNICIPAL MONEY MARKET PORTFOLIO
                            --------------------------------
                                           FOR THE PERIOD
                                         SEPTEMBER 30, 1988
                             FOR THE        (COMMENCEMENT 
                            YEAR ENDED    OF OPERATIONS) TO
                            AUGUST 31,        AUGUST 31,
                               1990             1989
                            ----------    -----------------
<S>                          <C>              <C>
Net asset value,                         
   beginning of period ..... $   1.00         $   1.00
                             --------         --------
Income from investment                   
   operations:                           
   Net investment income ...   0.0522           0.0513
   Net gains on securities               
     (both realized                      
     and unrealized) .......       --               --
                             --------         --------
       Total from                        
         investment                      
         operations ........   0.0522           0.0513
                             --------         --------
Less distributions                       
   Dividends (from net                   
     investment income) ....  (0.0522)         (0.0513)
   Distributions (from                   
     capital gains) ........       --               --
                             --------         --------
       Total distributions .  (0.0522)         (0.0513)
                             --------         --------
Net asset value,                         
    end of period .......... $   1.00         $   1.00
                             ========         ========
Total Return ...............    5.35%          5.72%(b)
Ratios/Supplemental Data                 
   Net assets, end of                    
     period (000) .......... $195,566         $ 85,806
   Ratios of expenses to                 
     average net assets ....   .75%(a)       .33%(a)(b)
   Ratios of net investment              
     income to average                   
     net assets ............    5.22%          5.70%(b)
                                        
<FN>
(a) Without  the waiver of advisory  and  administration  fees,  and without the
    reimbursement  of certain  operating  expenses,  the ratios of  expenses  to
    average net assets for the Municipal Money Market  Portfolio would have been
    1.15%,  1.14%,  1.12%,  1.14%,  1.12%,1.16%,  1.15%, 1.13% and 1.14% for the
    years ended August 31, 1998,  1997,  1996,  1995, 1994, 1993, 1992, 1991 and
    1990,  respectively,  and 1.27%  annualized  for the period ended August 31,
    1989.

(b) Annualized.

(c) Financial Highlights relate solely to the Bedford Class of shares within the
    Portfolio.
</FN>
</TABLE>

                                       6

<PAGE>

                               THE BEDFORD FAMILY

THE RBB FUND, INC. FINANCIAL HIGHLIGHTS (c)
     (FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

<TABLE>
<CAPTION>
                                                            GOVERNMENT OBLIGATIONS MONEY MARKET PORTFOLIO                   
                            ------------------------------------------------------------------------------------------------------
                                                                                                                                  
                                                                                                                                  
                                                                                                                                  
                              FOR THE      FOR THE     FOR THE      FOR THE      FOR THE      FOR THE      FOR THE      FOR THE   
                            YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED 
                            AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31, 
                               1998         1997         1996         1995         1994         1993         1992         1991    
                            ----------   ----------   ----------   ----------   ----------   ----------   ----------   ---------- 
<S>                          <C>          <C>          <C>          <C>          <C>          <C>          <C>          <C>        
Net asset value,
   beginning of period ..... $   1.00     $   1.00     $   1.00     $   1.00     $   1.00     $   1.00     $   1.00     $   1.00  
                             --------     --------     --------     --------     --------     --------     --------     --------  
Income from investment
   operations:
   Net investment income ...   0.0463       0.0449       0.0458       0.0475       0.0270       0.0231       0.0375       0.0604  
   Net gains on securities
     (both realized
     and unrealized) .......       --           --           --           --           --           --       0.0009           --  
                             --------     --------     --------     --------     --------     --------     --------     --------  
       Total from
         investment
         operations ........   0.0463       0.0449       0.0458       0.0475       0.0270       0.0231       0.0384       0.0604  
                             --------     --------     --------     --------     --------     --------     --------     --------  
Less distributions
   Dividends (from net
     investment income) ....  (0.0463)     (0.0449)     (0.0458)     (0.0475)     (0.0270)     (0.0231)     (0.0375)     (0.0604) 
   Distributions (from
     capital gains) ........       --           --           --           --           --           --      (0.0009)          --  
                             --------     --------     --------     --------     --------     --------     --------     --------  
       Total distributions .  (0.0463)     (0.0449)     (0.0458)     (0.0475)     (0.0270)     (0.0231)     (0.0384)     (0.0604) 
                             --------     --------     --------     --------     --------     --------     --------     --------  
Net asset value,
   end of period ........... $   1.00     $   1.00     $   1.00     $   1.00     $   1.00     $   1.00     $   1.00     $   1.00  
                             ========     ========     ========     ========     ========     ========     ========     ========  
Total Return ...............    4.74%        4.59%        4.68%        4.86%        2.73%        2.33%        3.91%        6.21%  
Ratios/Supplemental Data
   Net assets, end of
     period (000) .......... $128,447     $209,715     $192,599     $163,398     $166,418     $213,741     $225,101     $368,899  
   Ratios of expenses to
     average net assets ....  .975%(a)     .975%(a)     .975%(a)     .975%(a)     .975%(a)     .975%(a)     .975%(a)      .95%(a) 
   Ratios of net investment
     income to average
     net assets ............    4.63%        4.49%        4.58%        4.75%        2.70%        2.31%        3.75%        6.04%  
</TABLE>

<TABLE>
<CAPTION>
                            GOVERNMENT OBLIGATIONS MONEY MARKET PORTFOLIO
                            ---------------------------------------------
                                                  FOR THE PERIOD
                                                SEPTEMBER 30, 1988
                                     FOR THE       (COMMENCEMENT 
                                    YEAR ENDED   OF OPERATIONS) TO
                                    AUGUST 31,       AUGUST 31,
                                       1990            1989
                                    ----------   -----------------
<S>                                  <C>              <C>
Net asset value,                    
   beginning of period ...........   $   1.00         $   1.00
                                     --------         --------
Income from investment              
   operations:                      
   Net investment income .........     0.0748           0.0725
   Net gains on securities          
     (both realized                 
     and unrealized) .............         --               --
                                     --------         --------
       Total from                   
         investment                 
         operations ..............     0.0748           0.0725
                                     --------         --------
Less distributions                  
   Dividends (from net              
     investment income) ..........    (0.0748)         (0.0725)
   Distributions (from              
     capital gains) ..............         --               --
                                     --------         --------
       Total distributions .......    (0.0748)         (0.0725)
                                     --------         --------
Net asset value,                    
   end of period .................   $   1.00         $   1.00
                                     ========         ========
Total Return .....................      7.74%          8.64%(b)
Ratios/Supplemental Data            
   Net assets, end of               
     period (000) ................   $209,378         $ 66,281
   Ratios of expenses to            
     average net assets ..........     .95%(a)       .96%(a)(b)
   Ratios of net investment         
     income to average              
     net assets ..................      7.48%          8.34%(b)
                                
<FN>
(a) Without the waiver of advisory fees and without the reimbursement of certain
    operating  expenses,  the ratios of  expenses  to average net assets for the
    Government  Obligations Money Market Portfolio would have been 1.10%, 1.09%,
    1.10%,  1.13%,  1.17%,  1.18%,  1.12%,  1.13% and 1.17% for the years  ended
    August  31,  1998,  1997,  1996,  1995,  1994,  1993, 1992, 1991  and  1990,
    respectively, and 1.40% annualized for the period ended August 31, 1989.

(b) Annualized.

(c) Financial Highlights relate solely to the Bedford Class of shares within the
    Portfolio.
</FN>
</TABLE>

                                       7

<PAGE>

INVESTMENT OBJECTIVES AND POLICIES
- --------------------------------------------------------------------------------

                             MONEY MARKET PORTFOLIO

     The Money Market Portfolio's  investment  objective is to provide as high a
level of current interest income as is consistent with maintaining liquidity and
stability of principal. Portfolio obligations held by the Money Market Portfolio
have remaining  maturities of 397 days or less (exclusive of securities  subject
to  repurchase  agreements).  In pursuing its  investment  objective,  the Money
Market Portfolio invests in a diversified  portfolio of U.S.  dollar-denominated
instruments,  such as government,  bank and commercial obligations,  that may be
available  in the  money  markets  ("Money  Market  Instruments")  and that meet
certain  ratings  criteria and present  minimal credit risks to the Money Market
Portfolio.  See "Eligible  Securities." There is no assurance that the Portfolio
will achieve its investment objective. The following descriptions illustrate the
types of Money Market Instruments in which the Money Market Portfolio invests.

     BANK OBLIGATIONS.  The Portfolio may purchase obligations of issuers in the
banking  industry,  such as short-term  obligations  of bank holding  companies,
certificates of deposit, bankers' acceptances and time deposits,  including U.S.
dollar-denominated  instruments  issued or  supported  by the credit of U.S.  or
foreign  banks  or  savings  institutions  having  total  assets  at the time of
purchase in excess of $1 billion.  The  Portfolio  may invest  substantially  in
obligations  of  foreign  banks or  foreign  branches  of U.S.  banks  where the
investment  adviser deems the instrument to present  minimal credit risks.  Such
investments  may  nevertheless  entail  risks in  addition  to those of domestic
issuers,   including  higher   transaction   costs,   less  complete   financial
information,  less stringent regulatory  requirements and less market liquidity.
The Portfolio may also make interest-bearing  savings deposits in commercial and
savings banks in amounts not in excess of 5% of its total assets.

     COMMERCIAL PAPER. The Portfolio may purchase commercial paper rated (i) (at
the time of  purchase)  in the two  highest  rating  categories  of at least two
nationally recognized statistical rating organizations  ("Rating  Organization")
or,  by the only  Rating  Organization  providing  a rating;  or (ii)  issued by
issuers (or, in certain cases guaranteed by persons) with short-term debt having
such  ratings.  These  rating  categories  are  described in the Appendix to the
Statement of Additional  Information.  The  Portfolio may also purchase  unrated
commercial  paper  provided  that such paper is  determined  to be of comparable
quality by the  Portfolio's  investment  adviser in accordance  with  guidelines
approved by the Fund's Board of Directors.

     Commercial paper purchased by the Portfolio may include  instruments issued
by foreign issuers,  such as Canadian  Commercial  Paper ("CCP"),  which is U.S.
dollar-denominated  commercial  paper  issued  by a  Canadian  corporation  or a
Canadian  counterpart  of a U.S.  corporation,  and in Europaper,  which is U.S.
dollar-denominated commercial paper of a foreign issuer, subject to the criteria
stated above for other commercial paper issuers.

     VARIABLE RATE DEMAND NOTES. The Portfolio may purchase variable rate demand
notes, which are unsecured  instruments that permit the indebtedness  thereunder
to vary and provide for periodic  adjustment in the interest rate.  Although the
notes are not normally traded and there may be no active secondary market in the
notes,  the Portfolio will be able (at any time or during the specified  periods
not exceeding 13 months,  depending upon the note involved) to demand payment of
the  principal of a note.  The notes are not  typically  rated by credit  rating
agencies,  but  issuers of  variable  rate  demand  notes must  satisfy the same
criteria as set forth above for issuers of commercial  paper.  If an issuer of a
variable  rate demand note  defaulted on its payment  obligation,  the Portfolio
might be unable to  dispose  of the note  because  of the  absence  of an active
secondary market.  For this or other reasons,  the Portfolio might suffer a loss
to the extent of the  default.  The  Portfolio  invests in variable  rate demand
notes only when the  Portfolio's  investment  adviser  deems the  investment  to
involve  minimal credit risk. The Portfolio's  investment  adviser also monitors
the continuing  creditworthiness  of issuers of such notes to determine  whether
the Portfolio should continue to hold such notes.

                                       8

<PAGE>

     REPURCHASE AGREEMENTS.  The Portfolio may agree to purchase securities from
financial  institutions  subject to the seller's agreement to repurchase them at
an agreed-upon  time and price  ("repurchase  agreements").  The securities held
subject to a  repurchase  agreement  may have  stated  maturities  exceeding  13
months, provided the repurchase agreement itself matures in less than 13 months.
Default by or bankruptcy of the seller would,  however,  expose the Portfolio to
possible loss because of adverse market action or delays in connection  with the
disposition of the underlying obligations.

     U.S. GOVERNMENT OBLIGATIONS.  The Portfolio may purchase obligations issued
or  guaranteed  by the U.S.  Government  or its agencies and  instrumentalities.
Obligations of certain agencies and instrumentalities of the U.S. Government are
backed by the full faith and credit of the United  States.  Others are backed by
the right of the issuer to borrow  from the U.S.  Treasury or are backed only by
the credit of the agency or instrumentality issuing the obligation.

     ASSET-BACKED   SECURITIES.   The  Portfolio  may  invest  in   asset-backed
securities which are backed by mortgages,  installment  sales contracts,  credit
card  receivables  or  other  assets  and  collateralized  mortgage  obligations
("CMOs") issued or guaranteed by U.S. Government agencies and  instrumentalities
or issued by private companies.  Asset-backed securities also include adjustable
rate securities.  The estimated life of an asset-backed security varies with the
prepayment experience with respect to the underlying debt instruments.  For this
and other reasons, an asset-backed  security's stated maturity may be shortened,
and the  security's  total return may be difficult  to predict  precisely.  Such
difficulties  are not expected,  however,  to have a  significant  effect on the
Portfolio since the remaining  maturity of any  asset-backed  security  acquired
will be 13 months or less.  Asset-backed  securities  are considered an industry
for industry concentration purposes. See "Investment Limitations." In periods of
falling  interest  rates,  the rate of mortgage  prepayments  tends to increase.
During these periods, the reinvestment of proceeds by a Portfolio will generally
be at lower rates than the rates on the prepaid obligations.

     REVERSE  REPURCHASE  AGREEMENTS.  The  Portfolio  may  enter  into  reverse
repurchase agreements with respect to portfolio securities. A reverse repurchase
agreement   involves  a  sale  by  a  Portfolio  of  securities  that  it  holds
concurrently  with an agreement by the Portfolio to repurchase them at an agreed
upon time and price.  Reverse  repurchase  agreements  involve the risk that the
market value of the securities sold by the Portfolio may decline below the price
at which the  Portfolio is  obligated to  repurchase  them.  Reverse  repurchase
agreements are considered to be borrowings by the Portfolio under the Investment
Company Act of 1940 (the "1940 Act").

     GUARANTEED  INVESTMENT  CONTRACTS.  The Portfolio may make  investments  in
obligations,  such  as  guaranteed  investment  contracts  and  similar  funding
agreements  (collectively,  "GICs"),  issued  by  highly  rated  U.S.  insurance
companies.  A GIC is a general  obligation of the issuing  insurance company and
not a separate account. The Portfolio's  investments in GICs are not expected to
exceed 5% of its total  assets at the time of  purchase  absent  unusual  market
conditions.   GIC  investments  are  subject  to  the  Fund's  policy  regarding
investment in illiquid securities.

     MUNICIPAL  OBLIGATIONS.   In  addition,  the  Portfolio  may,  when  deemed
appropriate by its  investment  adviser in light of the  Portfolio's  investment
objective,  invest  without  limitation  in high quality,  short-term  Municipal
Obligations  issued by state and local  governmental  issuers,  the  interest on
which may be taxable or tax-exempt  for federal  income tax  purposes,  provided
that such  obligations  carry  yields that are  competitive  with those of other
types of Money Market  Instruments  of comparable  quality.  For a more complete
discussion of Municipal  Obligations,  see  "Investment  Objectives and Policies
- -Municipal Money Market Portfolio -- Municipal Obligations."

     STAND-BY COMMITMENTS. The Portfolio may acquire "stand-by commitments" with
respect  to  Municipal  Obligations  held in its  portfolio.  Under  a  stand-by
commitment, a dealer would agree to purchase at the Portfolio's option specified
Municipal  Obligations  at a  specified  price.  The  acquisition  of a stand-by
commitment may increase the cost, and thereby reduce the yield, of the Municipal
Obligation to which such commitment relates. The Portfolio will acquire stand-by
commitments  solely to  facilitate  portfolio  liquidity  and does not intend to
exercise its rights thereunder for trading purposes.

                                       9

<PAGE>

     WHEN-ISSUED SECURITIES.  The Portfolio may purchase portfolio securities on
a  "when-issued"  basis.  When-issued  securities are  securities  purchased for
delivery  beyond the normal  settlement  date at a stated  price and yield.  The
Portfolio will generally not pay for such  securities or start earning  interest
on them until they are received. Securities purchased on a when-issued basis are
recorded as an asset at the time the  commitment is entered into and are subject
to changes in value prior to delivery based upon changes in the general level of
interest rates. The Portfolio  expects that commitments to purchase  when-issued
securities  will not exceed 25% of the value of its total assets absent  unusual
market  conditions.  The  Portfolio  does not  intend  to  purchase  when-issued
securities  for  speculative  purposes but only in furtherance of its investment
objective.

     ELIGIBLE SECURITIES. The Portfolio will only purchase "eligible securities"
that present  minimal credit risks as determined by the  Portfolio's  investment
adviser  pursuant  to  guidelines  adopted by the Board of  Directors.  Eligible
securities  generally include:  (1) U.S. Government  securities,  (2) securities
that are rated at the time of purchase in the two highest  rating  categories by
at least two Rating Organizations  ("Rating  Organizations")  (e.g.,  commercial
paper rated "A-1" or "A-2" by Standard & Poor's Ratings Services  ("S&P")),  (3)
securities  that  are  rated  at  the  time  of  purchase  by  the  only  Rating
Organization rating the security in one of its two highest rating categories for
such  securities,  (4)  securities  issued by  issuers  (or,  in  certain  cases
guaranteed  by  persons)  with  short-term  debt having  such  ratings,  and (5)
securities  that are not  rated and are  issued by an issuer  that does not have
comparable  obligations rated by a Rating Organization  ("Unrated  Securities"),
provided that such  securities  are  determined  to be of comparable  quality to
eligible  rated  securities.   For  a  more  complete  description  of  eligible
securities,  see  "Investment  Objectives  and  Policies"  in the  Statement  of
Additional Information.

     ILLIQUID SECURITIES. The Portfolio will not invest more than 10% of its net
assets in illiquid  securities,  including  repurchase  agreements  which have a
maturity of longer than seven days,  time deposits with  maturities in excess of
seven days,  variable  rate demand notes with demand  periods in excess of seven
days unless the Portfolio's  investment  adviser  determines that such notes are
readily  marketable  and could be sold  promptly at the prices at which they are
valued, GICs, and other securities that are illiquid by virtue of the absence of
a readily  available  market or legal or  contractual  restrictions  on  resale.
Repurchase  agreements  subject to demand are deemed to have a maturity equal to
the notice period.  Securities  that have legal or contractual  restrictions  on
resale but have a readily  available market are not deemed illiquid for purposes
of  this  limitation.  The  Portfolio's  investment  adviser  will  monitor  the
liquidity of such  restricted  securities  under the supervision of the Board of
Directors.  See "Investment  Objectives and Policies -- Illiquid  Securities" in
the Statement of Additional Information.

                        MUNICIPAL MONEY MARKET PORTFOLIO

     The Municipal Money Market Portfolio's  investment  objective is to provide
as high a level of current  interest  income exempt from federal income taxes as
is  consistent  with  maintaining  liquidity  and  stability of  principal.  The
Municipal Money Market Portfolio  invests  substantially  all of its assets in a
diversified  portfolio  of  short-term  Municipal  Obligations,  the interest on
which, in the opinion of bond counsel or counsel to the issuer,  as the case may
be, is exempt from the regular  federal  income  tax.  During  periods of normal
market conditions,  at least 80% of the net assets of the Municipal Money Market
Portfolio  will be  invested in  Municipal  Obligations.  Municipal  Obligations
include securities,  the interest on which is Tax-Exempt  Interest,  although to
the extent the Portfolio  invests in certain private activity bonds issued after
August 7, 1986 ("Alternative Minimum Tax Securities"), a portion of the interest
earned by the Portfolio may constitute an item of tax preference for purposes of
the federal alternative minimum tax ("AMT Interest"). There is no assurance that
the investment objective of the Portfolio will be achieved.

     MUNICIPAL  OBLIGATIONS.  The  Portfolio  invests  in  short-term  Municipal
Obligations  which are  determined  by the  Portfolio's  investment  adviser  to
present minimal credit risks and that meet certain ratings criteria  pursuant to
guidelines established by the Fund's Board of Directors.  The Portfolio may also
purchase Unrated Securities provided that

                                       10

<PAGE>

such  securities  are  determined to be of comparable  quality to eligible rated
securities.  The applicable  Municipal  Obligations ratings are described in the
Appendix to the Statement of Additional Information.

     The Portfolio may hold uninvested cash reserves pending  investment  during
temporary defensive periods or if, in the opinion of the Portfolio's  investment
adviser,  suitable  obligations  bearing Tax-Exempt Interest or AMT Interest are
unavailable. There is no percentage limitation on the amount of assets which may
be held uninvested during temporary defensive periods.  Uninvested cash reserves
will not earn income.

     The two principal  classifications  of Municipal  Obligations  are "general
obligation"  securities and "revenue" securities.  General obligation securities
are secured by the  issuer's  pledge of its full faith,  credit and taxing power
for the payment of principal and interest.  Revenue  securities are payable only
from the revenues derived from a particular  facility or class of facilities or,
in some  cases,  from the  proceeds  of a special  excise tax or other  specific
excise tax or other  specific  revenue  source such as the user of the  facility
being financed.  Revenue securities include private activity bonds which are not
payable from the unrestricted revenues of the issuer.  Consequently,  the credit
quality of private  activity  bonds is  usually  directly  related to the credit
standing of the corporate user of the facility involved.

     Municipal  Obligations may also include "moral obligation" bonds, which are
normally  issued by special purpose public  authorities.  If the issuer of moral
obligation  bonds is unable to meet its debt  service  obligations  from current
revenues,  it may draw on a reserve fund,  the  restoration  of which is a moral
commitment but not a legal obligation of the state or municipality which created
the issuer.

     Although the Municipal  Money Market  Portfolio may invest more than 25% of
its net assets in (i) Municipal Obligations whose issuers are in the same state,
(ii) Municipal Obligations the interest on which is paid solely from revenues of
similar projects,  and (iii) private activity bonds bearing Tax-Exempt Interest,
it does not  currently  intend to do so on a regular  basis.  To the  extent the
Municipal  Money  Market   Portfolio's  assets  are  concentrated  in  Municipal
Obligations that are payable from the revenues of similar projects or are issued
by  issuers  located in the same  state,  the  Portfolio  will be subject to the
peculiar risks  presented by the laws and economic  conditions  relating to such
states or projects  to a greater  extent than it would be if its assets were not
so concentrated.

     TAX-EXEMPT DERIVATIVE SECURITIES.  The Municipal Money Market Portfolio may
invest  in  tax-exempt  derivative  securities  such  as  tender  option  bonds,
custodial  receipts,   participations,   beneficial   interests  in  trusts  and
partnership  interests.  A typical tax-exempt  derivative  security involves the
purchase  of an  interest  in a pool of  Municipal  Obligations  which  interest
includes a tender  option,  demand or other  feature,  allowing the Portfolio to
tender  the  underlying  Municipal  Obligation  to a  third  party  at  periodic
intervals and to receive the principal amount thereof. In some cases,  Municipal
Obligations are represented by custodial  receipts  evidencing  rights to future
principal or interest payments, or both, on underlying municipal securities held
by a custodian  and such  receipts  include the option to tender the  underlying
securities  to the sponsor  (usually a bank,  broker-dealer  or other  financial
institution). Although the Internal Revenue Service has not ruled on whether the
interest  received  on  derivative  securities  in  the  form  of  participation
interests or custodial receipts is Tax-Exempt Interest, opinions relating to the
validity of, and the tax-exempt  status of,  payments  received by the Portfolio
from such  derivative  securities  are  rendered  by counsel  to the  respective
sponsors of such derivatives and relied upon by the Portfolio in purchasing such
securities.  Neither the  Portfolio nor its  investment  adviser will review the
proceedings relating to the creation of any tax-exempt  derivative securities or
the basis for such legal opinions.

     WHEN-ISSUED   SECURITIES.   The  Portfolio  may  also  purchase   portfolio
securities on a "when-issued"  basis as described under  "Investment  Objectives
and Policies -- Money Market Portfolio -- When-Issued Securities."

     STAND-BY COMMITMENTS. The Portfolio may acquire "stand-by commitments" with
respect to  Municipal  Obligations  held in its  portfolio  as  described  under
"Investment  Objectives  and  Policies  -- Money  Market  Portfolio  -- Stand-By
Commitments."

                                       11

<PAGE>

     ELIGIBLE  SECURITIES.  The  Municipal  Money  Market  Portfolio  will  only
purchase  "eligible  securities" that present minimal credit risks as determined
by the  Portfolio's  investment  adviser  pursuant to guidelines  adopted by the
Board of Directors. For a more complete description of eligible securities,  see
"Investment  Objectives  and  Policies  -- Money  Market  Portfolio  -- Eligible
Securities"  and  "Investment  Objectives  and  Policies"  in the  Statement  of
Additional Information.

     ILLIQUID SECURITIES. The Portfolio will not invest more than 10% of its net
assets in illiquid  securities as described  under  "Investment  Objectives  and
Policies -- Illiquid Securities" in the Statement of Additional Information.

                  GOVERNMENT OBLIGATIONS MONEY MARKET PORTFOLIO

     The Government Obligations Money Market Portfolio's investment objective is
to provide  as high a level of current  interest  income as is  consistent  with
maintaining  liquidity  and  stability  of  principal.  It seeks to achieve such
objective  by investing  in  short-term  U.S.  Treasury  bills,  notes and other
obligations  issued or  guaranteed  by the U.S.  Government  or its  agencies or
instrumentalities,  and entering  into  repurchase  agreements  relating to such
obligations. The types of U.S. Government obligations in which the Portfolio may
invest  include a variety of U.S.  Treasury  obligations,  which  differ only in
their interest rates, maturities,  and times of issuance, and obligations issued
or  guaranteed  by the U.S.  Government  or its  agencies or  instrumentalities,
including  mortgage-related  securities.  Obligations  of certain  agencies  and
instrumentalities  of the  U.S.  Government,  such  as the  Government  National
Mortgage  Association  and the  Export-Import  Bank of the  United  States,  are
supported  by the full faith and credit of the U.S.  Treasury;  others,  such as
those of the Federal National Mortgage  Association,  are supported by the right
of the  issuer  to  borrow  from  the  Treasury,  others  are  supported  by the
discretionary  authority  of  the  U.S.  Government  to  purchase  the  agency's
obligations; still others, such as those of the Federal Farm Credit Banks or the
Federal Home Loan Mortgage Corporation,  are supported only by the credit of the
instrumentality.  No  assurance  can be given  that the  U.S.  Government  would
provide   financial   support   to   U.S.   Government-sponsored   agencies   or
instrumentalities  if it is not obligated to do so under law. The Portfolio will
invest in the  obligations of such agencies or  instrumentalities  only when the
investment  adviser  believes  that the  credit  risk with  respect  thereto  is
minimal.  There is no assurance that the  investment  objective of the Portfolio
will be achieved.

     Due to  fluctuations  in interest  rates,  the market  values of securities
issued or guaranteed by the U.S. Government,  its agencies and instrumentalities
may vary. Certain government securities held by the Portfolio may have remaining
maturities  exceeding 397 days if such  securities  provide for  adjustments  in
their interest rates not less frequently than every 397 days and the adjustments
are sufficient to cause the securities to have market values,  after adjustment,
which approximate their par values.

     REPURCHASE  AGREEMENTS.  The  Portfolio  may agree to  purchase  government
securities  from  financial  institutions  subject to the seller's  agreement to
repurchase them at an agreed-upon time and price ("repurchase agreements").  For
a more complete description of repurchase agreements, see "Investment Objectives
and Policies -- Money Market Portfolio -- Repurchase Agreements."

     REVERSE REPURCHASE  AGREEMENTS.  The Portfolio may borrow funds by entering
into  reverse   repurchase   agreements  in  accordance   with  the   investment
restrictions described below. The Portfolio would consider entering into reverse
repurchase  agreements to avoid otherwise selling  securities during unfavorable
market  conditions and to meet redemptions.  For a more complete  description of
reverse repurchase agreements,  see "Investment Objectives and Policies -- Money
Market Portfolio -- Reverse Repurchase Agreements."

     MORTGAGE-RELATED AND ASSET-BACKED SECURITIES.  Mortgage-related  securities
consist of mortgage loans which are assembled into pools, the interests in which
are  issued  and  guaranteed  by  an  agency  or  instrumentality  of  the  U.S.
Government,  though not necessarily by the U.S.  Government itself. The Fund may
also acquire asset-backed  securities as described under "Investment  Objectives
and Policies -- Money Market Portfolio -- Asset Backed Securities."

                                       12

<PAGE>

     LENDING OF SECURITIES. The Portfolio may also lend its portfolio securities
to  financial  institutions  in  accordance  with  the  investment  restrictions
described below. Such loans would involve risks of delay in receiving additional
collateral in the event the value of the collateral decreased below the value of
the securities  loaned or of delay in recovering  the securities  loaned or even
loss of rights in the  collateral  should the  borrower of the  securities  fail
financially.  However,  loans  will be  made  only to  borrowers  deemed  by the
Portfolio's  investment  adviser to be of good  standing  and only when,  in the
adviser's  judgment,  the  income to be  earned  from the  loans  justifies  the
attendant  risks.  Any  loans  of  the  Portfolio's  securities  will  be  fully
collateralized and marked to market daily.

     ILLIQUID SECURITIES. The Portfolio will not invest more than 10% of its net
assets in illiquid  securities as described  under  "Investment  Objectives  and
Policies--Money   Market  Portfolio  --  Illiquid  Securities"  and  "Investment
Objectives  and Policies -- Illiquid  Securities" in the Statement of Additional
Information.

YEAR 2000
- --------------------------------------------------------------------------------
     Like  other  mutual  funds,   financial  and  business   organizations  and
individuals  around  the  world,  the Fund could be  adversely  affected  if the
computer systems used by the Adviser and the Fund's other service providers,  or
persons with whom they deal, do not properly process and calculate  date-related
information  and data  from and after  January  1,  2000.  This  possibility  is
commonly known as the "Year 2000 Problem." The Year 2000 Problem could also hurt
companies whose securities the Fund holds or securities markets  generally.  The
Fund has been advised by the Adviser,  the Administrators and the Custodian that
they are actively  taking steps to address the Year 2000 Problem with respect to
the computer  systems  that they use and to obtain  assurances  that  comparable
steps are being taken by the Fund's other major service  providers.  While there
can be no  assurance  that  the  Fund's  service  providers  will be  Year  2000
compliant,  the Fund's service providers expect that their plans to be compliant
will be achieved.

INVESTMENT LIMITATIONS
- --------------------------------------------------------------------------------
     The Money Market,  Municipal Money Market and Government  Obligations Money
Market Portfolios'  respective  investment objectives and the policies described
above may be  changed  by the  Fund's  Board of  Directors  without  shareholder
approval.  The  Portfolios  may not,  however,  change the following  investment
limitations   (except  as  noted)  without  such  a  vote  of  their  respective
shareholders.   (A  more  detailed   description  of  the  following  investment
limitations,  together with other investment  limitations that cannot be changed
without a vote of  shareholders,  is  contained in the  Statement of  Additional
Information under "Investment Objectives and Policies.")

     The  Portfolios  may not borrow  money,  except  from  banks for  temporary
purposes and except for reverse repurchase  agreements,  and then in amounts not
in  excess  of 10% of the  value  of a  Portfolio's  assets  at the time of such
borrowing,  and only if after such borrowing there is asset coverage of at least
300% for all borrowings of the Portfolio; or mortgage, pledge or hypothecate any
of its assets except in connection with any such borrowing and in amounts not in
excess  of 10% of the  value  of a  Portfolio's  assets  at  the  time  of  such
borrowing;  or purchase portfolio securities while borrowings in excess of 5% of
the Portfolio's net assets are outstanding. (This borrowing provision is not for
investment  leverage,  but  solely to  facilitate  management  of a  Portfolio's
securities  by enabling the  Portfolio  to meet  redemption  requests  where the
liquidation  of  portfolio   securities  is  deemed  to  be  disadvantageous  or
inconvenient.)

     The Money Market and Municipal Money Market Portfolios may not:

         1. Purchase securities of any one issuer,  other than securities issued
     or guaranteed by the U.S. Government or its agencies and instrumentalities,
     if  immediately  after and as a result of such purchase more than 5% of the
     value of its total  assets  would be  invested  in the  securities  of such
     issuer,  or more  than 10% of the  outstanding  voting  securities  of such
     issuer would be owned by a Portfolio, except that up to 25% of the value of
     a  Portfolio's  total  assets  may be  invested  without  regard to such 5%
     limitation.

                                       13

<PAGE>

     The Money Market Portfolio may not:

         1. Purchase any securities other than Money Market Instruments, some of
     which may be subject to repurchase  agreements,  but the Portfolio may make
     interest-bearing  savings  deposits  in amounts  not in excess of 5% of the
     value of the Portfolio's assets and may make time deposits.

         2. Purchase any securities  which would cause, at the time of purchase,
     less  than 25% of the  value of the total  assets  of the  Portfolio  to be
     invested  in the  obligations  of issuers in the  banking  industry,  or in
     obligations,  such as repurchase  agreements,  secured by such  obligations
     (unless the Portfolio is in a temporary  defensive position) or which would
     cause,  at the time of  purchase,  more  than 25% of the value of its total
     assets to be invested in the obligations of issuers in any other industry.

     So long as it values its portfolio securities on the basis of the amortized
cost method of  valuation  pursuant  to Rule 2a-7 under the 1940 Act,  the Money
Market  Portfolio  will meet the following  limitations  on its  investments  in
addition  to the  fundamental  investment  limitations  described  above.  These
limitations  may be changed  without a vote of  shareholders of the Money Market
Portfolio.

         1.  The  Money  Market  Portfolio  will  limit  its  purchases  of  the
     securities  of any one  issuer,  other  than  issuers  of  U.S.  Government
     securities,  to 5% of its  total  assets,  except  that  the  Money  Market
     Portfolio  may  invest  more  than 5% of its  total  assets  in First  Tier
     Securities  of one  issuer  for a period of up to three  Business  Days (as
     defined below).  "First Tier Securities"  include eligible  securities that
     (i) if rated by more than one Rating  Organization,  are rated (at the time
     of  purchase)  by two or more Rating  Organizations  in the highest  rating
     category   for  such   securities,   (ii)  if  rated  by  only  one  Rating
     Organization,  are rated by such Rating  Organization in its highest rating
     category  for such  securities,  (iii)  have no  short-term  rating and are
     comparable in priority and security to a class of short-term obligations of
     the issuer of such  securities  that have been rated in accordance with (i)
     or (ii) above, or (iv) are Unrated  Securities that are determined to be of
     comparable  quality to such securities.  Purchases of First Tier Securities
     that  come  within  categories  (ii) and (iv)  above  will be  approved  or
     ratified by the Board of Directors.

         2. The Money Market  Portfolio  will limit its purchases of Second Tier
     Securities, which are eligible securities other than First Tier Securities,
     to 5% of its total assets.

         3. The Money Market  Portfolio  will limit its purchases of Second Tier
     Securities  of one issuer to the  greater  of 1% of its total  assets or $1
     million.

     The Municipal Money Market Portfolio may not:

         1. Purchase any securities which would cause more than 25% of the value
     of the total assets of the Portfolio to be invested in  obligations  at the
     time of purchase to be invested in issuers in the same industry.

     In addition, without shareholder approval, the Portfolio may not change its
policy of investing  during  normal  market  conditions  at least 80% of its net
assets in  obligations  the  interest  on which is  Tax-Exempt  Interest  or AMT
Interest.

     The Government Obligations Money Market Portfolio may not:

         1. Purchase  securities other than U.S. Treasury bills, notes and other
     obligations  issued or guaranteed by the U.S.  Government,  its agencies or
     instrumentalities, and repurchase agreements relating to such obligations.

         2. Make loans  except  that the  Portfolio  may  purchase  or hold debt
     obligations  in  accordance  with its  investment  objective,  policies and
     limitations,  may enter into repurchase agreements for securities,  and may
     lend  portfolio  securities  against  collateral,  consisting  of  cash  or
     securities which are consistent with the Portfolio's permitted investments,
     which is equal at all times to at least 100% of the value of the securities
     loaned. There is no investment restriction on the amount of securities that
     may be loaned,  except that  payments  received  on such  loans,  including
     amounts  received  during the loan on account of interest on the securities
     loaned, may not

                                       14

<PAGE>

     (together with all  non-qualifying  income)  exceed 10% of the  Portfolio's
     annual gross income (without offset for realized capital gains) unless,  in
     the  opinion of counsel to the Fund,  such  amounts are  qualifying  income
     under federal  income tax  provisions  applicable  to regulated  investment
     companies.

PURCHASE AND REDEMPTION OF SHARES
- --------------------------------------------------------------------------------

                               PURCHASE PROCEDURES

     GENERAL. Bedford Shares are sold without a sales load on a continuous basis
by the Distributor.  The Distributor is located at Four Falls Corporate  Center,
West Conshohocken,  Pennsylvania.  Investors may purchase Bedford Shares through
an account  maintained by the investor with his brokerage  firm (the  "Account")
and may also  purchase  Shares  directly by mail or wire.  The  minimum  initial
investment is $1,000, and the minimum subsequent investment is $100. The Fund in
its sole  discretion  may  accept or reject any order for  purchases  of Bedford
Shares.

     All  payments  for initial  and  subsequent  investments  should be in U.S.
dollars. Purchases will be effected at the net asset value next determined after
PFPC, the Fund's transfer agent, has received a purchase order in good order and
the Fund's  custodian  has Federal Funds  immediately  available to it. In those
cases  where  payment  is made by check,  Federal  Funds will  generally  become
available two Business Days after the check is received. A "Business Day" is any
day that both the New York Stock  Exchange (the "NYSE") and the Federal  Reserve
Bank of Philadelphia (the "FRB") are open. On any Business Day, orders which are
accompanied  by Federal  Funds and  received  by the Fund by 12:00 noon  Eastern
Time,  and orders as to which payment has been  converted  into Federal Funds by
12:00 noon Eastern  Time,  will be executed as of 12:00 noon that  Business Day.
Orders which are  accompanied  by Federal Funds and received by PFPC after 12:00
noon  Eastern  Time  but  prior  to the  close of  regular  trading  on the NYSE
(generally  4:00 p.m.  Eastern  Time),  and orders as to which  payment has been
converted  into  Federal  Funds after 12:00 noon  Eastern  Time but prior to the
close of regular  trading on the NYSE on any Business  Day of the Fund,  will be
executed as of the closed of regular  trading on the NYSE on that  Business Day,
but will not be entitled to receive  dividends  declared on such  Business  Day.
Orders which are accompanied by Federal Funds and received by the Fund as of the
close of regular  trading on the NYSE or later,  and orders as to which  payment
has been  converted to Federal  Funds as of the close of regular  trading on the
NYSE or later on a Business  Day will be processed as of 12:00 noon Eastern Time
on the following Business Day.

     PURCHASES  THROUGH AN ACCOUNT.  Purchases of Shares may be effected through
an  investor's  Account  with  his  broker  through  procedures  established  in
connection  with the  requirements  of Accounts at such  broker.  In such event,
beneficial  ownership of Bedford  Shares will be recorded by the broker and will
be reflected in the Account statements provided by the broker to such investors.
A broker may impose minimum  investment Account  requirements.  Even if a broker
does not impose a sales charge for purchases of Bedford Shares, depending on the
terms of an  investor's  Account  with his  broker,  the  broker  may  charge an
investor's Account fees for automatic  investment and other services provided to
the Account.  Information concerning Account requirements,  services and charges
should be obtained from an investor's broker, and this Prospectus should be read
in conjunction with any information  received from a broker.  Shareholders whose
shares  are held in the  street  name  account  of a broker  and who  desire  to
transfer such shares to the street name account of another broker should contact
their current broker.

     A broker may offer investors  maintaining  Accounts the ability to purchase
Bedford  Shares  under an  automatic  purchase  program (a  "Purchase  Program")
established  by a  participating  broker.  An  investor  who  participates  in a
Purchase  Program  will have his  "free-credit"  cash  balances  in his  Account
automatically invested in Shares of the Bedford Class designated by the investor
as the  "Primary  Bedford  Class" for his  Purchase  Program.  The  frequency of
investments and the minimum  investment  requirement  will be established by the
broker and the Fund.  In  addition,  the broker may require a minimum  amount of
cash and/or  securities  to be deposited in an Account for  participants  in its
Purchase  Program.  The description of the particular  broker's Purchase Program
should be read for details, and any

                                       15

<PAGE>

inquiries  concerning an Account under a Purchase  Program should be directed to
the broker.  A participant in a Purchase  Program may change the  designation of
the Primary Bedford Class at any time by so instructing his broker.

     If a broker  makes  special  arrangements  under  which  orders for Bedford
Shares are  received by PFPC prior to 12:00 noon  Eastern  Time,  and the broker
guarantees that payment for such Shares will be made in available  Federal Funds
to the Fund's custodian prior to the close of regular trading on the NYSE on the
same day, such purchase orders will be effective and Shares will be purchased at
the  offering  price in effect  as of 12:00  noon  Eastern  Time on the date the
purchase order is received by PFPC.

     DIRECT PURCHASES.  An investor may also make direct investments at any time
in any Bedford  Class he selects  through  any broker  that has  entered  into a
dealer  agreement  with the  Distributor  (a "Dealer").  An investor may make an
initial investment in any of the Bedford Classes by mail by fully completing and
signing an application  obtained from a Dealer (the  "Application"),  specifying
the  Portfolio  in which he wishes to invest,  and mailing it,  together  with a
check payable to "The Bedford Family" to the Bedford Family,  c/o PFPC, P.O. Box
8950,  Wilmington,  Delaware  19899.  The  check  must  specify  the name of the
Portfolio for which shares are being purchased.  An Application will be returned
to the  investor  unless it  contains  the name of the  Dealer  from whom it was
obtained.  Subsequent  purchases  may be made through a Dealer or by  forwarding
payment to the Fund's transfer agent at the foregoing address.

     Provided  that the  investment  is at least  $2,500,  an investor  may also
purchase  Shares in any of the Bedford Classes by having his bank or Dealer wire
Federal Funds to the Fund's Custodian, PFPC Trust Company. An investor's bank or
Dealer may impose a charge for this service.  The Fund does not currently charge
for effecting wire  transfers but reserves the right to do so in the future.  In
order to ensure  prompt  receipt of an  investor's  Federal  Funds wire,  for an
initial investment, it is important that an investor follows these steps:

     A. Telephone the Fund's transfer agent, PFPC,  toll-free  (800)533-7719 (in
Delaware call collect (302) 791-1196), and provide your name, address, telephone
number,  Social  Security  or  Tax  Identification  Number,  the  Bedford  Class
selected,  the amount being wired,  and by which bank or Dealer.  PFPC will then
provide  an  investor  with a Fund  account  number.  (Investors  with  existing
accounts should also notify PFPC prior to wiring funds.)

     B. Instruct your bank or Dealer to wire the specified amount, together with
your assigned account number, to PFPC's account with PNC Bank.

         PNC Bank, N.A., Philadelphia, PA
         ABA-0310-0005-3.
         FROM: (name of investor)
         ACCOUNT NUMBER: (investor's account number with the Portfolio)
         FOR PURCHASE OF: (name of the Portfolio)
         AMOUNT: (amount to be invested)

     C. Fully complete and sign the Application and mail it to the address shown
thereon.  PFPC will not  process  initial  purchases  until it  receives a fully
completed and signed Application.

     For subsequent investments, an investor should follow steps A and B above.

     RETIREMENT  PLANS.  Bedford  Shares may be  purchased in  conjunction  with
individual  retirement  accounts  ("IRAs")  and  rollover  IRAs where PFPC Trust
Company acts as custodian. For further information as to applications and annual
fees,  contact the Distributor or your broker. To determine whether the benefits
of an IRA are available and/or appropriate,  a shareholder should consult with a
tax adviser.

                                       16

<PAGE>

                              REDEMPTION PROCEDURES

     Redemption  orders  are  effected  at the net asset  value  per share  next
determined  after  receipt of the order in proper  form by the  Fund's  transfer
agent, PFPC. Investors may redeem all or some of their Shares in accordance with
one of the procedures described below.

     REDEMPTION  OF SHARES IN AN ACCOUNT.  An  investor  who  beneficially  owns
Bedford  Shares  through an Account may redeem  Bedford Shares in his Account in
accordance  with  instructions  and  limitations  pertaining  to his  Account by
contacting his broker.  If such notice is received by PFPC by 12:00 noon Eastern
Time on any  Business  Day,  the  redemption  will be effective as of 12:00 noon
Eastern Time on that day. Payment of the redemption  proceeds will be made after
12:00 noon Eastern Time on the day the redemption is effected, provided that the
Fund's  custodian is open for business.  If the  custodian is not open,  payment
will be made on the  next  bank  business  day.  If the  redemption  request  is
received  between  12:00 noon and the close of regular  trading on the NYSE on a
Business  Day,  the  redemption  will be  effective  as of the close of  regular
trading on the NYSE on such  Business  Day and payment  will be made on the next
bank business day following receipt of the redemption request. If all Shares are
redeemed, all accrued but unpaid dividends on those Shares will be paid with the
redemption proceeds.

     An investor's  brokerage firm may also redeem each day a sufficient  number
of Shares of the  Primary  Bedford  Class to cover  debit  balances  created  by
transactions in the Account or instructions for cash disbursements.  Shares will
be redeemed  on the same day that a  transaction  occurs that  results in such a
debit balance or charge.

     Each  brokerage  firm  reserves  the right to waive or modify  criteria for
participation in an Account or to terminate  participation in an Account for any
reason.

     REDEMPTION  OF SHARES  OWNED  DIRECTLY.  A direct  investor  may redeem any
number of Shares by sending a written  request to The  Bedford  Family c/o PFPC,
P.O. Box 8950, Wilmington, Delaware 19899. Redemption requests must be signed by
each  shareholder  in the same manner as the Shares are  registered.  Redemption
requests  for joint  accounts  require the  signature  of each joint  owner.  On
redemption  requests of $5,000 or more,  each signature  must be  guaranteed.  A
signature  guarantee  may be  obtained  from a domestic  bank or trust  company,
broker, dealer, clearing agency or savings association who are participants in a
medallion program recognized by the Securities Transfer  Association.  The three
recognized  medallion programs are Securities  Transfer Agents Medallion Program
(STAMP),  Stock Exchanges  Medallion Program (SEMP) and New York Stock Exchange,
Inc. Medallion Signature Program (MSP).  Signature  guarantees that are not part
of these programs will not be accepted.

     Direct investors may redeem Shares without charge by telephone if they have
completed  and  returned  an  account  application  containing  the  appropriate
telephone  election.  To add a  telephone  option to an  existing  account  that
previously did not provide for this option, a Telephone  Authorization Form must
be filed with PFPC.  This form is available  from PFPC.  Once this  election has
been made, the  shareholder  may simply contact PFPC by telephone to request the
redemption by calling (888)  261-4073.  Neither the Fund, the  Distributor,  the
Portfolios,  the  Administrator  nor any other Fund agent will be liable for any
loss,  liability,  cost or expense for  following  the  procedures  below or for
following instructions communicated by telephone that they reasonably believe to
be genuine.

     The Fund's telephone transaction procedures include the following measures:
(1)  requiring  the  appropriate  telephone  transaction  privilege  forms;  (2)
requiring  the caller to provide  the names of the account  owners,  the account
social  security  number and name of the portfolio,  all of which must match the
Fund's records;  (3) requiring the Fund's service  representative  to complete a
telephone  transaction  form,  listing  all of the above  caller  identification
information; (4) requiring that redemption proceeds be sent only by check to the
account owners of record at the address of record, or by wire only to the owners
of record at the bank account of record; (5) sending a written  confirmation for
each  telephone  transaction  to the  owners of record at the  address of record
within  five  (5)  business  days of the  call;  and (6)  maintaining  tapes  of
telephone  transactions for six months, if the Fund elects to record shareholder
telephone  transactions.  For accounts held of record by  broker-dealers  (other
than the Distributor), financial institutions, securities deal-

                                       17

<PAGE>

ers,   financial   planners   or  other   industry   professionals,   additional
documentation  or  information  regarding  the scope of a caller's  authority is
required.   Finally,  for  telephone  transactions  in  accounts  held  jointly,
additional  information  regarding other account holders is required.  Telephone
transactions  will not be permitted in connection  with IRA or other  retirement
plan accounts or by attorney-in-fact under power of attorney.

     Proceeds of a telephone  redemption  request  will be mailed by check to an
investor's  registered  address unless he has  designated in his  Application or
Telephone  Authorization Form that such proceeds are to be sent by wire transfer
to a specified  checking or savings account.  If proceeds are to be sent by wire
transfer,  a telephone redemption request received prior to the close of regular
trading  on the NYSE  will  result in  redemption  proceeds  being  wired to the
investor's  bank  account on the next day that a wire  transfer can be effected.
The minimum redemption for proceeds sent by wire transfer is $2,500. There is no
maximum for proceeds sent by wire transfer.  The Fund may modify this redemption
service at any time or charge a service fee upon prior  notice to  shareholders,
although no fee is currently contemplated.

     REDEMPTION  BY CHECK.  Upon  request,  the Fund  will  provide  any  direct
investor  and any investor who does not have check  writing  privileges  for his
Account with forms of drafts  ("checks")  payable through PNC Bank. These checks
may be made  payable to the order of anyone.  The  minimum  amount of a check is
$100;  however, a broker may establish a higher minimum.  An investor wishing to
use this check writing  redemption  procedure should complete specimen signature
cards (available from PFPC), and then forward such signature cards to PFPC. PFPC
will then  arrange for the checks to be honored by PNC Bank.  Investors  who own
Shares  through an Account  should  contact their  brokers for signature  cards.
Investors  of joint  accounts  may elect to have  checks  honored  with a single
signature.  Check  redemptions  will be subject to PNC  Bank's  rules  governing
checks. An investor will be able to stop payment on a check redemption. The Fund
or PNC Bank may terminate this redemption service at any time, and neither shall
incur any  liability  for honoring  checks,  for  effecting  redemptions  to pay
checks, or for returning checks which have not been accepted.

     When a check is  presented  to PNC Bank for  clearance,  PNC  Bank,  as the
investor's  agent, will cause the Fund to redeem a sufficient number of full and
fractional  Shares owned by the investor to cover the amount of the check.  This
procedure  enables the investor to continue to receive dividends on those Shares
representing  the amount being redeemed by check until such time as the check is
presented to PNC Bank.  Pursuant to rules under the 1940 Act,  checks may not be
presented for cash payment at the offices of PNC Bank.  This limitation does not
affect checks used for the payment of bills or cash at other banks.

     ADDITIONAL  REDEMPTION  INFORMATION.  The Fund ordinarily will make payment
for all Shares  redeemed within seven days after receipt by PFPC of a redemption
request in proper form.  Although the Fund will redeem Shares purchased by check
before the check clears, payment of the redemption proceeds may be delayed for a
period of up to fifteen days after their purchase,  pending a determination that
the check has cleared. This procedure does not apply to Shares purchased by wire
payment.  Investors should consider  purchasing Shares using a certified or bank
check or  money  order  if they  anticipate  an  immediate  need for  redemption
proceeds.

     The Fund imposes no charge when Shares are redeemed.  The Fund reserves the
right to redeem any account in a Bedford  Class  involuntarily,  on thirty days'
notice,  if such account  falls below $500 and during such 30-day  notice period
the amount  invested in such account is not increased to at least $500.  Payment
for Shares  redeemed may be postponed  or the right of  redemption  suspended as
provided by the rules of the Securities and Exchange Commission.

NET ASSET VALUE
- --------------------------------------------------------------------------------
     The net  asset  value  per share of each  class of the  Portfolios  for the
purpose of pricing purchase and redemption  orders is determined twice each day,
once as of 12:00 noon Eastern Time and once as of the close of regular trading

                                       18

<PAGE>

on the NYSE on each weekday with the exception of those holidays on which either
the NYSE or the FRB is closed. Currently, the NYSE is closed on weekends and the
customary  national business holidays of New Year's Day, Dr. Martin Luther King,
Jr. Day,  Presidents' Day, Good Friday,  Memorial Day,  Independence  Day, Labor
Day,  Thanksgiving  Day and Christmas Day and the preceding Friday or subsequent
Monday  when one of these  holidays  falls on a Saturday  or Sunday.  The FRB is
currently  closed on weekends and the same  holidays on which the NYSE is closed
as well as Veterans' Day and Columbus Day. The net asset value per share of each
class is  calculated by adding the  proportionate  interest of each class in the
value of the securities, cash and other assets of the Portfolio, subtracting the
accrued  and  actual  liabilities  of the class and  dividing  the result by the
number of outstanding shares of the class. The net asset value per share of each
class  of the  Fund  is  determined  independently  of any of the  Fund's  other
classes.

     The Fund seeks to maintain for each of the  Portfolios a net asset value of
$1.00 per share for  purposes  of  purchases  and  redemptions  and  values  its
portfolio  securities  on the basis of the  amortized  cost method of  valuation
described  in  the  Statement  of  Additional   Information  under  the  heading
"Valuation of Shares."  There can be no assurance that net asset value per share
will not vary.

     With the approval of the Board of Directors,  a Portfolio may use a pricing
service,  bank  or  broker-dealer  experienced  in such  matters  to  value  the
Portfolio's  securities.  A more  detailed  discussion  of net  asset  value and
security valuation is contained in the Statement of Additional Information.

MANAGEMENT
- --------------------------------------------------------------------------------

BOARD OF DIRECTORS

     The  business  and affairs of the Fund and each  investment  portfolio  are
managed under the direction of the Fund's Board of Directors. The Fund currently
operates or proposes to operate  seventeen  investment  portfolios.  Each of the
Bedford Classes  represents  interests in one of the following  portfolios:  the
Money Market Portfolio,  the Municipal Money Market Portfolio and the Government
Obligations Money Market Portfolio.

INVESTMENT ADVISER

     BIMC,  an indirect  majority-owned  subsidiary  of PNC Bank,  serves as the
investment adviser for each of the Portfolios. BIMC has its principal offices at
Bellevue Park  Corporate  Center,  400 Bellevue  Parkway,  Wilmington,  Delaware
19809.  PNC Bank and its  subsidiaries  currently  manage over $45.9  billion of
assets,  of which  approximately  $31.4  billion are mutual  funds.  PNC Bank, a
national  bank  whose  principal   business   address  is  1600  Market  Street,
Philadelphia,  Pennsylvania 19103, is a wholly-owned  subsidiary of PNC Bancorp,
Inc. PNC Bancorp,  Inc. is a bank holding company and a wholly-owned  subsidiary
of PNC Bank Corp., a multi-bank holding company.

     As investment  adviser to the Portfolios,  BIMC manages such Portfolios and
is responsible for all purchases and sales of portfolio securities.  In entering
into Portfolio  transactions  for a Portfolio with a broker,  BIMC may take into
account  the  sale  by  such  broker  of  shares  of the  Fund,  subject  to the
requirements  of best  execution.  The  agreements  between  BIMC and RBB,  with
respect to the Money Market and Government  Obligations Money Market Portfolios,
respectively,  provide  for BIMC to also assist  generally  in  supervising  the
operations  of such  Portfolios,  and to  maintain  such  Portfolio's  financial
accounts and records. These administrative  responsibilities have been delegated
to PFPC as described below.

     For the services  provided to and expenses assumed by it for the benefit of
each of the Money Market and  Government  Obligations  Money Market  Portfolios,
BIMC is entitled  to receive  the  following  fees,  computed  daily and payable
monthly based on a Portfolio's  average daily net assets: .45% of the first $250
million; .40% of the next $250 million; and .35% of net assets in excess of $500
million.

                                       19

<PAGE>

     For the services  provided  and expenses  assumed by it with respect to the
Municipal  Money  Market  Portfolio,  BIMC is entitled to receive the  following
fees,  computed daily and payable monthly based on the Portfolio's average daily
net assets: .35% of the first $250 million;  .30% of the next $250 million;  and
 .25% of net assets in excess of $500 million.

     BIMC may in its discretion from time to time agree to waive voluntarily all
or any portion of its advisory fee for any Portfolio.

     For the Fund's fiscal year ended August 31, 1998, the Fund paid  investment
advisory  fees  aggregating  .24% of the average net assets of the Money  Market
Portfolio,  .08%  of the  average  net  assets  of the  Municipal  Money  Market
Portfolio and .30% of the average net assets of the Government Obligations Money
Market Portfolio.  For that same year, BIMC waived  approximately .12%, .26% and
 .12% of average net assets of the Money Market Portfolio, Municipal Money Market
Portfolio and the Government Obligations Money Market Portfolio, respectively.

     PNC Bank was formerly  sub-adviser  to the Money  Market,  Municipal  Money
Market and  Government  Obligations  Portfolios  and provided  research,  credit
analysis and recommendations  with respect to each such Portfolio's  investments
and supplied  certain  computer  facilities,  personnel and other services.  The
facilities,  personnel,  services and related  expenses have been transferred to
BIMC and in return,  BIMC's  obligation to pay a portion of the sub-advisory fee
to PNC Bank has been  terminated.  For its sub-advisory  services,  PNC Bank was
entitled to receive from BIMC an amount equal to 75% of the investment  advisory
fee paid by each such  Portfolio  to BIMC  (subject  to  adjustment  in  certain
circumstances).  The sub-advisory fees paid by BIMC to PNC Bank had no effect on
the  investment  advisory fees payable by such  Portfolios to BIMC. The services
provided by BIMC and the fees payable by the  Portfolio  for these  services are
described  further in the Statement of Additional  Information under "Management
of the Company."

ADMINISTRATOR

     PFPC serves as the  administrator  for the Municipal Money Market Portfolio
and  generally  assists the Portfolio in all aspects of its  administration  and
operations,  including  matters relating to the maintenance of financial records
and accounting.  PFPC is entitled to an  administration  fee, computed daily and
payable  monthly  at .10% of the  average  daily net  assets  of the  Portfolio.
Pursuant  to its  advisory  agreements  with the Fund with  respect to the Money
Market  and  Government  Obligations  Money  Market  Portfolios,  BIMC  provides
administrative  services to such Portfolios  pursuant to the same terms, but has
delegated to PFPC all of its accounting  and  administrative  obligations  under
such advisory  agreements.  The Fund has agreed to pay directly to PFPC the fees
for  accounting and  administrative  services to the Money Market and Government
Obligations Money Market Portfolios which PFPC would have received directly from
BIMC. Such  arrangement  has no effect on the total advisory and  administrative
fees payable by such Portfolios to BIMC.  PFPC's  principal  business address is
400 Bellevue Parkway, Wilmington, Delaware 19809.

TRANSFER AGENT, DIVIDEND DISBURSING AGENT AND CUSTODIAN

     PFPC Trust Company of PFPC, an indirect wholly owned subsidiary of PNC Bank
Corp.,  will succeed PNC Bank,  National  Association ("PNC Bank") as the Fund's
Custodian  pursuant to an assignment.  PNC Bank will continue to provide certain
services to PFPC Trust  Company.  PFPC serves as the Fund's  transfer  agent and
dividend  disbursing  agent.  The  principal  offices of PFPC are located at 400
Bellevue  Parkway,  Wilmington,  Delaware 19809. PFPC may enter into shareholder
servicing  agreements  with  Dealers for the  provision  of certain  shareholder
support  services  to  customers  of such  Dealers who are  shareholders  of the
Portfolios.  The  services  provided  and the fees payable by the Fund for these
services  are  described  in  the  Statement  of  Additional  Information  under
"Investment Advisory, Distribution and Servicing Arrangements."

                                       20

<PAGE>

DISTRIBUTOR

     Provident  Distributors,  Inc., with a principal  business  address at Four
Falls  Corporate  Center,   West  Conshohocken,   Pennsylvania  19428,  acts  as
Distributor of the Shares of each of the Bedford Classes of the Fund pursuant to
a distribution agreement dated May 29, 1998 (the "Distribution Agreement").

EXPENSES

     The expenses of each  Portfolio  are deducted from the total income of such
Portfolio  before  dividends are paid. Any general expenses of the Fund that are
not readily  identifiable as belonging to a particular  investment  portfolio of
the Fund will be allocated  among all  investment  portfolios  of the Fund based
upon the relative net assets of the investment  portfolios.  The Bedford Classes
of the Fund pay their own  distribution  fees and may pay a different share than
other classes of the Fund of other  expenses  (excluding  advisory and custodial
fees) if those  expenses  are  actually  incurred in a  different  amount by the
Bedford Class or if they receive different services.

     The investment  adviser may assume  expenses of the Portfolios from time to
time.  In certain  circumstances,  it may assume such  expenses on the condition
that it is reimbursed by the  Portfolios  for such amounts prior to the end of a
fiscal  year.  In such event,  the  reimbursement  of such amounts will have the
effect of  increasing  a  Portfolio's  expense  ratio and of  lowering  yield to
investors.

     For the Fund's fiscal year ended August 31, 1998, the Fund's total expenses
were 1.10% of the average net assets  with  respect to the Bedford  Class of the
Money Market Portfolio (not taking into account waivers of .13%),  were 1.15% of
the average net assets with respect to the Bedford Class of the Municipal  Money
Market Portfolio (not taking into account waivers of .26%) and were 1.10% of the
average  net  assets  with  respect  to the  Bedford  Class  of  the  Government
Obligations Money Market Portfolio (not taking into account waivers of .125%).

DISTRIBUTION OF SHARES
- --------------------------------------------------------------------------------
     The Board of  Directors of the Fund  approved and adopted the  Distribution
Agreement  and  separate  Plans  of   Distribution   for  each  of  the  Classes
(collectively,  the  "Plans")  pursuant to Rule 12b-1 under the 1940 Act.  Under
each of the Plans,  the  Distributor  is entitled to receive  from the  relevant
Bedford Class a distribution fee, which is accrued daily and paid monthly, of up
to .65% on an  annualized  basis of the average daily net assets of the relevant
Bedford Class.  The actual amount of such  compensation is agreed upon from time
to time  by the  Fund's  Board  of  Directors  and the  Distributor.  Under  the
Distribution  Agreement,  the Distributor has agreed to accept  compensation for
its services thereunder and under the Plans in the amount of .60% of the average
daily  net  assets of the  relevant  Class on an  annualized  basis in any year.
Pursuant to the  conditions of an exemptive  order granted by the Securities and
Exchange Commission, the Distributor has agreed to waive its fee with respect to
a  Bedford  Class on any day to the  extent  necessary  to  assure  that the fee
required to be accrued by such Class does not exceed the income of such Class on
that day. In addition, the Distributor may, in its discretion, voluntarily waive
from time to time all or any portion of its distribution fee.

     Under the Distribution Agreement and the relevant Plan, the Distributor may
reallocate  an  amount  up to  the  full  fee  that  it  receives  to  financial
institutions,  including  broker/dealers,  based upon the  aggregate  investment
amounts  maintained  by and services  provided to  shareholders  of any relevant
Class  serviced  by  such  financial  institutions.  The  Distributor  may  also
reimburse  broker/dealers  for other  expenses  incurred in the promotion of the
sale of Fund shares. The Distributor  and/or  broker/dealers pay for the cost of
printing   (excluding   typesetting)   and  mailing  to  prospective   investors
prospectuses  and other  materials  relating  to the Fund as well as for related
direct mail, advertising and promotional expenses.

                                       21

<PAGE>

     Each of the Plans obligates the Fund, during the period it is in effect, to
accrue and pay to the Distributor on behalf of each Bedford Class the fee agreed
to under the Distribution  Agreement.  Payments under the Plans are not based on
expenses  actually  incurred by the  Distributor,  and the  payments  may exceed
distribution expenses actually incurred.

DIVIDENDS AND DISTRIBUTIONS
- --------------------------------------------------------------------------------
     The Fund will distribute substantially all of the net investment income and
net  realized  capital  gains,  if  any,  of  each  of the  Portfolios  to  each
Portfolio's  shareholders.  All  distributions  are  reinvested  in the  form of
additional  full and  fractional  Shares of the relevant  Bedford Class unless a
shareholder elects otherwise.

     The net investment income (not including any net short-term  capital gains)
earned by each  Portfolio  will be  declared  as a dividend on a daily basis and
paid monthly.  Dividends are payable to shareholders of record immediately prior
to the  determination  of net asset value made as of the close of trading of the
NYSE.  Net  short-term  capital  gains,  if any,  will be  distributed  at least
annually.

TAXES
- --------------------------------------------------------------------------------
     Distributions   from  the  Money  Market   Portfolio  and  the   Government
Obligations Money Market Portfolio will generally be taxable to shareholders. It
is expected that all, or substantially all, of these  distributions will consist
of  ordinary  income.  You will be subject to income tax on these  distributions
regardless whether they are paid in cash or reinvested in additional shares. The
one major exception to these tax principles is that distributions on shares held
in an IRA (or other tax-qualified plan) will not be currently taxable.

     Distributions  from the Municipal  Money Market  Portfolio  will  generally
constitute  tax-exempt  income for shareholders for federal income tax purposes.
It is possible,  depending upon the Portfolio's  investments,  that a portion of
the  Portfolio's  distributions  could be taxable to  shareholders  as  ordinary
income or capital gains, but it is not expected that this will be the case.

     Although distributions from the Municipal Money Market Portfolio are exempt
for federal income tax purposes,  they will generally  constitute taxable income
for state and local income tax purposes except that, subject to limitations that
vary  depending on the state,  distributions  from  interest  paid by a state or
municipal entity may be exempt from tax in that state.

     Interest on  indebtedness  incurred by a  shareholder  to purchase or carry
shares of the Municipal Money Market Portfolio  generally will not be deductible
for federal income tax purposes.

     You should note that a portion of the exempt-interest dividends paid by the
Municipal  Money Market  Portfolio may  constitute an item of tax preference for
purposes   of   determining   federal   alternative   minimum   tax   liability.
Exempt-interest  dividends  will also be  considered  along with other  adjusted
gross income in determining  whether any Social Security or railroad  retirement
payments received by you are subject to federal income taxes.

     The  foregoing  is only a summary of certain tax  considerations  under the
current law,  which may be subject to change in the future.  You should  consult
your tax adviser for further information regarding federal,  state, local and/or
foreign tax consequences relevant to your specific situation.

DESCRIPTION OF SHARES
- --------------------------------------------------------------------------------
     The Fund has  authorized  capital of thirty billion shares of Common Stock,
$.001 par  value  per  share,  of which  18.326  billion  shares  are  currently
classified  into 97  different  classes  of Common  Stock (see  "Description  of
Shares" in the Statement of Additional Information).

                                       22

<PAGE>

     The Fund  offers  multiple  classes of shares in each of its Money  Market,
Municipal  Money Market and Government  Obligations  Money Market  Portfolios to
expand its  marketing  alternatives  and to  broaden  its range of  services  to
different investors. The expenses of the various classes within these Portfolios
vary based upon the services provided, which may affect performance.  Each class
of Common Stock of the Fund has a separate Rule 12b-1  distribution  plan. Under
the  Distribution  Agreement  entered into with the  Distributor and pursuant to
each of the distribution plans, the Distributor is entitled to receive from each
class  as  compensation  for  distribution  services  provided  to that  class a
distribution  fee based on average daily net assets.  A salesperson or any other
person  entitled to receive  compensation  for servicing Fund shares may receive
different  compensation  with respect to different classes in a Portfolio of the
Fund. An investor may contact the Fund's  Distributor by calling  1-800-888-9723
to request more information concerning other classes available.

     THIS  PROSPECTUS AND THE STATEMENT OF ADDITIONAL  INFORMATION  INCORPORATED
HEREIN RELATE  PRIMARILY TO THE BEDFORD  CLASSES OF THE MONEY MARKET,  MUNICIPAL
MONEY MARKET AND  GOVERNMENT  OBLIGATIONS  MONEY MARKET  PORTFOLIOS AND DESCRIBE
ONLY THE  INVESTMENT  OBJECTIVES AND POLICIES,  OPERATIONS,  CONTRACTS AND OTHER
MATTERS RELATING TO THE BEDFORD CLASSES OF THESE PORTFOLIOS.

     Each  share  that  represents  an  interest  in a  Portfolio  has an  equal
proportionate interest in the assets belonging to such Portfolio with each other
share that  represents an interest in such  Portfolio,  even where a share has a
different class designation than another share  representing an interest in that
Portfolio.  Shares of the Fund do not have preemptive or conversion rights. When
issued for payment as described in this  Prospectus,  Shares of the Fund will be
fully paid and non-assessable.

     The Fund currently does not intend to hold annual  meetings of shareholders
except  as  required  by the 1940 Act or other  applicable  law.  The law  under
certain circumstances provides shareholders with the right to call for a meeting
of shareholders to consider the removal of one or more directors.  To the extent
required  by law,  the Fund will  assist in  shareholder  communication  in such
matters.

     Holders of shares of each of the Portfolios  will vote in the aggregate and
not by class on all matters,  except where otherwise  required by law.  Further,
shareholders of all investment portfolios of the Fund will vote in the aggregate
and not by portfolio  except as  otherwise  required by law or when the Board of
Directors determines that the matter to be voted upon affects only the interests
of the shareholders of a particular investment portfolio.  (See the Statement of
Additional Information under "Additional Information Concerning Fund Shares" for
examples of when the 1940 Act  requires  voting by  investment  portfolio  or by
class.)  Shareholders  of the Fund are  entitled to one vote for each full share
held  (irrespective  of class or portfolio) and fractional  votes for fractional
shares held. Voting rights are not cumulative and,  accordingly,  the holders of
more than 50% of the aggregate  shares of Common Stock of the Fund may elect all
of the directors.

     As of November 16, 1998, to the Fund's knowledge,  no person held of record
or beneficially  25% or more of the outstanding  shares of all of the classes of
the Fund.

OTHER INFORMATION
- --------------------------------------------------------------------------------

REPORTS AND INQUIRIES

     Shareholders  will receive  unaudited  semi-annual  reports  describing the
Fund's  investment   operations  and  annual  financial  statements  audited  by
independent accountants.  Shareholder inquiries should be addressed to PFPC, the
Fund's transfer agent,  Bellevue Park Corporate  Center,  400 Bellevue  Parkway,
Wilmington,  Delaware 19809,  toll-free (800) 533-7719 (in Delaware call collect
(302) 791-1196).

                                       23

<PAGE>

================================================================================
NO  PERSON  HAS  BEEN  AUTHORIZED  TO  GIVE  ANY  INFORMATION  OR  TO  MAKE  ANY
REPRESENTATIONS  NOT CONTAINED IN THIS PROSPECTUS OR IN THE FUND'S  STATEMENT OF
ADDITIONAL INFORMATION  INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE
OFFERING MADE BY THIS  PROSPECTUS  AND, IF GIVEN OR MADE,  SUCH  INFORMATION  OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE FUND OR
ITS DISTRIBUTOR.  THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY THE FUND OR
BY THE  DISTRIBUTOR IN ANY  JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY
BE MADE.

                              --------------------
                                    CONTENTS
                                                                           PAGE
Introduction ...........................................................      2
Financial Highlights ...................................................      4
Investment Objectives and Policies .....................................      8
Year 2000 ..............................................................     13
Investment Limitations .................................................     13
Purchase and Redemption of Shares ......................................     15
Net Asset Value ........................................................     18
Management .............................................................     19
Distribution of Shares .................................................     21
Dividends and Distributions ............................................     22
Taxes ..................................................................     22
Description of Shares ..................................................     22
Other Information ......................................................     23


INVESTMENT ADVISER
BlackRock Institutional Management Corporation
Wilmington, Delaware

DISTRIBUTOR
Provident Distributors, Inc.
West Conshohocken, Pennsylvania

CUSTODIAN
PFPC Trust Company
Wilmington, Delaware

ADMINISTRATOR AND TRANSFER AGENT
PFPC Inc.
Wilmington, Delaware

COUNSEL
Drinker Biddle & Reath LLP
Philadelphia, Pennsylvania

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers LLP
Philadelphia, Pennsylvania

================================================================================

<PAGE>
================================================================================
                                CASH PRESERVATION
                                   PORTFOLIOS
                                 [LOGO OMITTED]

                                       OF
                               THE RBB FUND, INC.



                             MONEY MARKET PORTFOLIO
                                       AND
                             MUNICIPAL MONEY MARKET
                                    PORTFOLIO


                                   Prospectus
                                December 29, 1998

================================================================================

<PAGE>

                                CASH PRESERVATION
                                   PORTFOLIOS
                                 [LOGO OMITTED]

                          CASH PRESERVATION PORTFOLIOS
                                       OF
                               THE RBB FUND, INC.

     The Cash Preservation  Portfolios consist of two classes of common stock of
The RBB Fund, Inc. (the "Fund"), an open-end management  investment company. The
shares of the Cash  Preservation  Classes offered by this  Prospectus  represent
interests  in a taxable  money  market  portfolio  and a municipal  money market
portfolio.  The investment  objectives of each investment portfolio described in
this Prospectus are as follows:

     MONEY MARKET  PORTFOLIO  -- to provide as high a level of current  interest
income as is consistent with  maintaining  liquidity and stability of principal.
It seeks to achieve such  objective by investing in a  diversified  portfolio of
U.S. dollar-denominated money market instruments.

     MUNICIPAL MONEY MARKET  PORTFOLIO  -- to provide as high a level of current
interest  income  exempt  from  federal  income  taxes  as  is  consistent  with
maintaining  liquidity  and  stability  of  principal.  It seeks to achieve such
objective  by  investing  substantially  all  of  its  assets  in a  diversified
portfolio of  short-term  Municipal  Obligations.  "Municipal  Obligations"  are
obligations issued by or on behalf of states, territories and possessions of the
United  States,  the  District of  Columbia  and their  political  subdivisions,
agencies,  instrumentalities  and  authorities.  During periods of normal market
conditions,  at least 80% of the net assets of the Portfolio will be invested in
Municipal Obligations,  the interest on which is exempt from the regular federal
income tax but which may  constitute an item of tax  preference  for purposes of
the federal alternative minimum tax.

     SHARES OF THE FUND ARE NOT DEPOSITS OR  OBLIGATIONS  OF, OR  GUARANTEED  OR
ENDORSED BY PNC BANK, NATIONAL ASSOCIATION, PFPC TRUST COMPANY OR ANY OTHER BANK
AND  SHARES  ARE  NOT  FEDERALLY   INSURED  BY  THE  FEDERAL  DEPOSIT  INSURANCE
CORPORATION,  THE FEDERAL  RESERVE  BOARD,  OR ANY OTHER  AGENCY. INVESTMENTS IN
SHARES OF THE FUND INVOLVE  INVESTMENT  RISKS,  INCLUDING  THE POSSIBLE  LOSS OF
PRINCIPAL.  THERE  CAN BE NO  ASSURANCE  THAT  THE  PORTFOLIOS  WILL  BE ABLE TO
MAINTAIN A STABLE NET ASSET VALUE OF $1.00 PER SHARE.

     BlackRock Institutional Management Corporation serves as investment adviser
for these  Portfolios  and PFPC Trust Company  serves as custodian for the Fund.
PFPC Inc. serves as administrator and transfer and dividend disbursing agent for
the Fund. Provident Distributors, Inc. acts as distributor for the Fund.

     This Prospectus  contains concise  information that a prospective  investor
needs to know before investing. Please keep it for future reference. A Statement
of  Additional  Information,  dated  December 29, 1998,  has been filed with the
Securities  and Exchange  Commission  and is  incorporated  by reference in this
Prospectus.  It may be  obtained  upon  request  free of charge from the Fund by
calling (800) 430-9618.  The Prospectus and Statement of Additional  Information
are also available for reference, along with other related materials, on the SEC
Internet Website (http://www.sec.gov).

- --------------------------------------------------------------------------------
THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THIS
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------

PROSPECTUS                                                     December 29, 1998

<PAGE>

INTRODUCTION
- --------------------------------------------------------------------------------
     The  RBB  Fund,  Inc.  is  an  open-end   management   investment   company
incorporated  under the laws of the State of Maryland on February 29, 1988.  The
Fund  is  currently   operating  or  proposing  to  operate  seventeen  separate
investment  portfolios.  Each  of  the  two  classes  (collectively,  the  "Cash
Preservation  Classes")  of the Fund's  shares  ("Cash  Preservation  Shares" or
"Shares")  offered  by  this  Prospectus  represents  interests  in  one  of the
following of such  investment  portfolios:  the Money Market  Portfolio  and the
Municipal Money Market Portfolio (together, the "Portfolios").

     The MONEY MARKET PORTFOLIO'S  investment  objective is to provide as high a
level of current interest income as is consistent with maintaining liquidity and
stability of  principal.  It seeks to achieve  such  objective by investing in a
diversified portfolio of U.S.  dollar-denominated money market instruments which
meet certain ratings  criteria and present minimal credit risks. In pursuing its
investment  objective,  the Money Market  Portfolio  invests in a broad range of
U.S. dollar  denominated  instruments,  such as government,  bank and commercial
obligations, that may be available in the money markets.

     The MUNICIPAL MONEY MARKET PORTFOLIO'S  investment  objective is to provide
as high a level of current  interest  income exempt from federal income taxes as
is consistent with maintaining liquidity and stability of principal.  To achieve
this objective,  the Municipal Money Market Portfolio invests  substantially all
of its assets in a  diversified  portfolio of short-term  Municipal  Obligations
which meet certain  ratings  criteria and present  minimal credit risks.  During
periods  of normal  market  conditions,  at least  80% of the net  assets of the
Portfolio  will be invested in Municipal  Obligations,  the interest on which is
exempt from the regular  federal  income tax but which may constitute an item of
tax preference for purposes of the federal alternative minimum tax.

     Each of the  Portfolios  seeks to  maintain a net asset  value of $1.00 per
share;  however,  there can be no assurance that the Portfolios  will be able to
maintain a stable net asset value of $1.00 per share.

     The Portfolios'  investment adviser is Blackrock  Institutional  Management
Corporation  ("BIMC").  PFPC Trust Company  serves as custodian to the Fund, and
PFPC  Inc.  ("PFPC")  serves  as the  administrator  to the  Portfolios  and the
transfer and dividend disbursing agent to the Fund. Provident Distributors, Inc.
(the "Distributor") acts as distributor of the Fund's Shares.

     An investor may purchase Shares of either of the Cash Preservation  Classes
by mail, bank wire or by payment from insurance policies. An investor may redeem
Shares of either of the Cash  Preservation  Classes by mail,  Fund check,  or by
telephone.  For more  detailed  information  of how to  purchase  or redeem Cash
Preservation  Shares,  please refer to the section of this  Prospectus  entitled
"Purchase and Redemption of Shares."

     An  investment  in either of the Cash  Preservation  Classes  is subject to
certain  risks,  as  set  forth  in  detail  under  "Investment  Objectives  and
Policies."  Either or both of the  Portfolios,  to the  extent  set forth  under
"Investment  Objectives and  Policies,"  may engage in the following  investment
practices:  the use of repurchase agreements and reverse repurchase  agreements,
the purchase of securities on a "when-issued" or "forward  commitment" basis and
the purchase of stand-by commitments.  All of these transactions involve certain
special risks, as set forth under "Investment Objectives and Policies."

                                       2

<PAGE>

FEE TABLE

     The Fee Table below contains a summary of the annual operating  expenses of
the Cash  Preservation  Classes of the Portfolios based on expenses incurred for
the fiscal year ended August 31,  1998,  as a  percentage  of average  daily net
assets. An example based on the summary is also shown.

<TABLE>
<CAPTION>
ANNUAL FUND OPERATING EXPENSES (CASH PRESERVATION CLASSES)
     AS A PERCENTAGE OF AVERAGE DAILY NET ASSETS                                                    MUNICIPAL
                                                                                 MONEY MARKET     MONEY MARKET
                                                                                   PORTFOLIO        PORTFOLIO
                                                                                 ------------     ------------

<S>                                                                                   <C>              <C> 
Management fees (after waivers)(1)                                                    .24%             .08%
12b-1 fees(1)                                                                         .40              .40
Other Expenses (after waivers)(1)                                                     .31              .50
                                                                                      ---              ---
Total Fund Operating Expenses (Cash Preservation Classes) (after waivers)(1)          .95%             .98%
                                                                                      ===              ===
<FN>
(1) Management Fees and 12b-1 Fees are based on average daily net assets and are
    calculated  daily and paid  monthly.  Before  waivers  for the Money  Market
    Portfolio and Municipal  Money Market  Portfolio,  Management  Fees would be
    .36% and .34%,  respectively,  Other  Expenses  would be 9.08%  and  22.41%,
    respectively,  and Total Fund  Operating  Expenses would be 9.84% and 23.15%
    respectively.
</FN>
</TABLE>

EXAMPLE

     An  investor  would  pay the  following  expenses  on a $1,000  investment,
assuming (1) 5% annual return and (2) redemption at the end of each time period:

                                  1 YEAR     3 YEARS     5 YEARS    10 YEARS
                                  ------     -------     -------    --------
Money Market*.................      $10       $30          $53        $117
Municipal Money Market*.......      $10       $31          $54        $120

* Other classes of these Portfolios are sold with different fees and expenses.

     The Example in the Fee Table assumes that all  dividends and  distributions
are reinvested and that the amounts listed under "Annual Fund Operating Expenses
(Cash  Preservation  Classes)"  remain the same in the years shown.  THE EXAMPLE
SHOULD NOT BE CONSIDERED A REPRESENTATION  OF PAST OR FUTURE EXPENSES AND ACTUAL
EXPENSES MAY BE GREATER OR LESS THAN THOSE SHOWN. Long-term shareholders may pay
more  than the  economic  equivalent  of the  maximum  front-end  sales  charges
permitted by the National Association of Securities Dealers, Inc.

     The Fee Table is  designed  to  assist an  investor  in  understanding  the
various costs and expenses that an investor in the Cash Preservation  Classes of
the Fund will bear directly or indirectly.  (For more complete  descriptions  of
the  various  costs  and  expenses,  see  "Management--Investment  Adviser"  and
"Distribution  of Shares"  below.) Expense figures are based on actual costs and
fees  charged  to each  class.  The Fee Table  reflects  a  voluntary  waiver of
Management Fees for each Portfolio.  However, there can be no assurance that any
future  waivers of Management  Fees will not vary from the figures  reflected in
the Fee Table.  In addition,  the  investment  adviser is currently  voluntarily
assuming additional  expenses of the Portfolios.  There can be no assurance that
the  investment  adviser will  continue to assume such  expenses.  Assumption of
additional  expenses  will have the  effect of  lowering a  Portfolio's  overall
expense ratio and increasing its yield to investors.

                                       3

<PAGE>

     From time to time a Portfolio  advertises its "total  return,"  "yield" and
"effective  yield."  TOTAL  RETURN  AND YIELD  FIGURES  ARE BASED ON  HISTORICAL
EARNINGS AND ARE NOT INTENDED TO INDICATE FUTURE  PERFORMANCE.  The "yield" of a
Portfolio  refers to the income generated by an investment in a Portfolio over a
seven-day period (which period will be stated in the advertisement). This income
is then  "annualized." That is, the amount of income generated by the investment
during that week is assumed to be generated  each week over a 52-week period and
is shown as a percentage of the investment.  The "effective yield" is calculated
similarly  but,  when  annualized,  the  income  earned  by an  investment  in a
Portfolio is assumed to be reinvested.  The  "effective  yield" will be slightly
higher  than the  "yield"  because  of the  compounding  effect of this  assumed
reinvestment.  The Municipal Money Market Portfolio's "tax-equivalent yield" may
also be quoted from time to time,  which shows the level of taxable yield needed
to produce an after-tax  equivalent to such Portfolio's  tax-free yield. This is
done by increasing such  Portfolio's  yield  (calculated as above) by the amount
necessary to reflect the payment of federal income tax at a stated tax rate.

     The total  return and yield of any  investment  is  generally a function of
portfolio quality and maturity,  type of investment and operating expenses.  The
total return and yield on Shares of either of the Cash Preservation Classes will
fluctuate and is not  necessarily  representative  of future  results.  Any fees
charged  by  broker/dealers  directly  to their  customers  in  connection  with
investments  in the Cash  Preservation  Classes are not  reflected  in the total
return and yields of the Cash  Preservation  Shares,  and such fees, if charged,
will reduce the actual return received by shareholders on their investments. The
total  return and yield on Shares of the Cash  Preservation  Classes  may differ
from the total  return  and  yields on shares of other  classes of the Fund that
also represent  interests in the same  Portfolio  depending on the allocation of
expenses to each of the classes of that Portfolio.

FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
     The table below sets forth certain  information  concerning  the investment
results of the Cash  Preservation  Classes  representing  interests in the Money
Market and Municipal  Money Market  Portfolios  for the periods  indicated.  The
financial  data  included in this table for each of the periods ended August 31,
1994 through  August 31, 1998 are part of the Fund's  financial  statements  for
each of the  Portfolios,  which have been  incorporated  by  reference  into the
Statement    of    Additional    Information    and   have   been   audited   by
PricewaterhouseCoopers  LLP  ("PricewaterhouseCoopers"),  the Fund's independent
accountants. The financial data for each of the Portfolios for the periods ended
August 31,  1989,  1990,  1991,  1992 and 1993 are a part of previous  financial
statements audited by PricewaterhouseCoopers.  The financial data should be read
in  conjunction  with  the  financial  statements  and  notes  thereto.  Further
information  about the  performance of the Portfolios is available in the Annual
Report to  Shareholders.  Both the Statement of Additional  Information  and the
Annual  Report to  Shareholders  may be  obtained  free of charge by calling the
telephone number on page 1 of this Prospectus.

                                       4

<PAGE>

CASH PRESERVATION CLASSES

                            CASH PRESERVATION FAMILY
                               THE RBB FUND, INC.
FINANCIAL HIGHLIGHTS (c)
     (FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

<TABLE>
<CAPTION>
                                                                       MONEY MARKET PORTFOLIO
                            -----------------------------------------------------------------------------------------------------
                                                                                                                                  
                                                                                                                                  
                              FOR THE      FOR THE     FOR THE      FOR THE      FOR THE      FOR THE      FOR THE      FOR THE   
                            YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED 
                            AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31, 
                               1998         1997         1996         1995         1994         1993         1992         1991    
                            ----------   ----------   ----------   ----------   ----------   ----------   ----------   ---------- 
<S>                          <C>          <C>           <C>         <C>          <C>          <C>          <C>          <C>       
Net asset value,
   beginning of period ..... $   1.00     $   1.00      $   1.00    $   1.00     $   1.00     $   1.00     $   1.00     $   1.00  
                             --------     --------      --------    --------     --------     --------     --------     --------  
Income from investment
   operations:
   Net investment income ...   0.0474       0.0464        0.0471      0.0487       0.0278       0.0243       0.0375       0.0626  
   Net gains on securities
     (both realized
     and unrealized) .......       --           --            --          --           --           --       0.0007           --  
                             --------     --------      --------    --------     --------     --------     --------     --------  
       Total from
         investment
         operations ........   0.0474       0.0464        0.0471      0.0487       0.0278       0.0243       0.0382       0.0626  
                             --------     --------      --------    --------     --------     --------     --------     --------  
Less distributions
   Dividends (from net
     investment income) ....  (0.0474)     (0.0464)      (0.0471)    (0.0487)     (0.0278)     (0.0243)     (0.0375)     (0.0626) 
   Distributions (from
     capital gains) ........       --           --            --          --           --           --      (0.0007)          --  
                             --------     --------      --------    --------     --------     --------     --------     --------  
       Total distributions .  (0.0474)     (0.0464)      (0.0471)    (0.0487)     (0.0278)     (0.0243)     (0.0382)     (0.0626) 
                             --------     --------      --------    --------     --------     --------     --------     --------  
Net asset value,
    end of period .......... $   1.00     $   1.00      $   1.00    $   1.00     $   1.00     $   1.00     $   1.00     $   1.00  
                             ========     ========      ========    ========     ========     ========     ========     ========  
Total Return ...............    4.86%        4.74%         4.81%       4.98%        2.81%        2.46%        3.89%        6.45%  
Ratios/Supplemental Data
   Net assets, end of
     period (000) .......... $    226     $    242      $    202    $    236     $    231     $  1,229     $  1,233     $  1,412  
   Ratios of expenses to
     average net assets ....   .95%(a)      .95%(a)       .95%(a)     .95%(a)      .95%(a)      .95%(a)      .95%(a)      .95%(a) 
   Ratios of net investment
     income to average
     net assets ............    4.74%        4.64%         4.71%       4.87%        2.78%        2.43%        3.75%        6.26%  
</TABLE>

<TABLE>
<CAPTION>
                                  MONEY MARKET PORTFOLIO
                            --------------------------------
                                            FOR THE PERIOD
                                          SEPTEMBER 30, 1988
                              FOR THE        (COMMENCEMENT
                             YEAR ENDED    OF OPERATIONS) TO
                             AUGUST 31,         AUGUST 31,
                                1990               1989
                            ----------    ------------------
<S>                           <C>                <C>
Net asset value,
   beginning of period .....  $  1.00            $   1.00
                              -------            --------
Income from investment
   operations:
   Net investment income ...   0.0763              0.0780
   Net gains on securities
     (both realized
     and unrealized) .......       --                  --
                              -------            --------
       Total from
         investment
         operations ........   0.0763              0.0780
                              -------            --------
Less distributions
   Dividends (from net
     investment income) ....  (0.0763)            (0.0780)
   Distributions (from
     capital gains) ........       --                  --
                              -------            --------
       Total distributions .  (0.0763)            (0.0780)
                              -------            --------
Net asset value,
    end of period ..........  $  1.00            $   1.00
                              =======            ========
Total Return ...............    7.90%             8.81%(b)
Ratios/Supplemental Data
   Net assets, end of
     period (000) ..........  $ 1,799            $  2,213
   Ratios of expenses to
     average net assets ....   .94%(a)             .95%(a)(b)
   Ratios of net investment
     income to average
     net assets ............    7.63%             8.59%(b)

<FN>
(a) Without  the waiver of  advisory  and  transfer  agency fees and without the
    reimbursement  of certain  operating  expenses,  the ratios of  expenses  to
    average  net assets for the Money  Market  Portfolio  would have been 9.84%,
    10.68%,  12.08%,  9.34%,  2.52%, 2.25%, 2.30%, 2.13% and 1.69% for the years
    ended August 31, 1998,  1997,  1996,  1995, 1994, 1993, 1992, 1991 and 1990,
    respectively, and 1.59% annualized for the period ended August 31, 1989.

(b) Annualized.

(c) Financial  Highlights relate solely to the Cash Preservation Class of Shares
    within the Portfolio.
</FN>
</TABLE>

                                       5

<PAGE>

CASH PRESERVATION CLASSES

                            CASH PRESERVATION FAMILY
                               THE RBB FUND, INC.
FINANCIAL HIGHLIGHTS (c)
     (FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

<TABLE>
<CAPTION>
                                                                 MUNICIPAL MONEY MARKET PORTFOLIO
                            -----------------------------------------------------------------------------------------------------
                                                                                                                                  
                                                                                                                                  
                              FOR THE      FOR THE     FOR THE      FOR THE      FOR THE      FOR THE      FOR THE      FOR THE   
                            YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED 
                            AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31, 
                               1998         1997         1996         1995         1994         1993         1992         1991    
                            ----------   ----------   ----------   ----------   ----------   ----------   ----------   ---------- 
<S>                          <C>          <C>          <C>          <C>          <C>          <C>          <C>          <C>       
Net asset value,
   beginning of period ....  $   1.00     $   1.00     $  1.00      $   1.00     $   1.00     $   1.00     $   1.00     $   1.00  
                             --------     --------     -------      --------     --------     --------     --------     --------  
Income from investment
   operations:
   Net investment income ..    0.0274       0.0272      0.0274        0.0281       0.0174       0.0174       0.0266       0.0408  
   Net gains on securities
     (both realized
     and unrealized) ......        --           --          --            --           --           --           --           --  
                             --------     --------     -------      --------     --------     --------     --------     --------  
       Total from
         investment
         operations .......    0.0274       0.0272      0.0274        0.0281       0.0174       0.0174       0.0266       0.0408  
                             --------     --------     -------      --------     --------     --------     --------     --------  
Less distributions
   Dividends (from net
     investment income) ...   (0.0274)     (0.0272)    (0.0274)      (0.0281)     (0.0174)     (0.0174)     (0.0266)     (0.0408) 
   Distributions (from
     capital gains) .......        --           --          --            --           --           --           --           --  
                             --------     --------     -------      --------     --------     --------     --------     --------  
       Total distributions    (0.0274)     (0.0272)    (0.0274)      (0.0281)     (0.0174)     (0.0174)     (0.0266)     (0.0408) 
                             --------     --------     -------      --------     --------     --------     --------     --------  
Net asset value,
    end of period .........  $   1.00     $   1.00     $  1.00      $   1.00     $   1.00     $   1.00     $   1.00     $   1.00  
                             ========     ========     =======      ========     ========     ========     ========     ========  
Total Return ..............     2.82%        2.76%       2.78%         2.84%        1.75%        1.75%        2.69%        4.16%  
Ratios/Supplemental Data
   Net assets, end of
     period (000) .........  $     92     $     97     $   116      $    161     $    201     $    157     $    214     $    281  
   Ratios of expenses to
     average net assets ...    .98%(a)      .98%(a)     .98%(a)       .98%(a)      .98%(a)      .98%(a)      .98%(a)      .97%(a) 
   Ratios of net investment
     income to average
     net assets ...........     2.78%        2.72%       2.74%         2.81%        1.74%        1.74%        2.66%        4.08%  
</TABLE>

<TABLE>
<CAPTION>
                            MUNICIPAL MONEY MARKET PORTFOLIO
                            --------------------------------
                                           FOR THE PERIOD
                                         SEPTEMBER 30, 1988
                             FOR THE       (COMMENCEMENT
                            YEAR ENDED    OF OPERATIONS) TO
                            AUGUST 31,       AUGUST 31,
                               1990             1989
                            ----------   ----------------- 
<S>                          <C>              <C>
Net asset value,
   beginning of period ..... $   1.00         $   1.00
                             --------         --------
Income from investment
   operations:
   Net investment income ...   0.0499           0.0497
   Net gains on securities
     (both realized
     and unrealized) .......       --               --
                             --------         --------
       Total from
         investment
         operations ........   0.0499           0.0497
                             --------         --------
Less distributions
   Dividends (from net
     investment income) ....  (0.0499)         (0.0497)
   Distributions (from
     capital gains) ........       --               --
                             --------         --------
       Total distributions .  (0.0499)         (0.0497)
                             --------         --------
Net asset value,
    end of period .......... $   1.00         $   1.00
                             ========         ========
Total Return ...............    5.11%          5.53%(b)
Ratios/Supplemental Data
   Net assets, end of
     period (000) .......... $    236         $     36
   Ratios of expenses to
     average net assets ....   .98%(a)          .94%(a)(b)
   Ratios of net investment
     income to average
     net assets ............    4.99%          5.49%(b)

<FN>
(a) Without the waiver of advisory,  administration and transfer agency fees and
    without  the  reimbursement  of certain  operating  expenses,  the ratios of
    expenses  to average net assets for the  Municipal  Money  Market  Portfolio
    would have been 23.15% 26.58%,  19.20%,  10.80%, 11.52%, 8.95%, 5.91%, 5.59%
    and 15.08% for the years ended  August 31, 1998,  1997,  1996,  1995,  1994,
    1993,  1992,  1991 and 1990,  respectively,  and 51.02%  annualized  for the
    period ended August 31, 1989.

(b) Annualized.

(c) Financial  Highlights relate solely to the Cash Preservation Class of Shares
    within the Portfolio.
</FN>
</TABLE>

                                       6

<PAGE>

INVESTMENT OBJECTIVES AND POLICIES
- --------------------------------------------------------------------------------

                             MONEY MARKET PORTFOLIO

     The Money Market Portfolio's  investment  objective is to provide as high a
level of current interest income as is consistent with maintaining liquidity and
stability of principal. Portfolio obligations held by the Money Market Portfolio
have remaining  maturities of 397 days or less (exclusive of securities  subject
to  repurchase  agreements).  In pursuing its  investment  objective,  the Money
Market Portfolio invests in a diversified  portfolio of U.S.  dollar-denominated
instruments,  such as government,  bank and commercial obligations,  that may be
available  in the  money  markets  ("Money  Market  Instruments")  and that meet
certain  ratings  criteria and present  minimal credit risks to the Money Market
Portfolio.  See "Eligible  Securities." There is no assurance that the Portfolio
will achieve its investment objective. The following descriptions illustrate the
types of Money Market Instruments in which the Money Market Portfolio invests.

     BANK OBLIGATIONS.  The Portfolio may purchase obligations of issuers in the
banking  industry,  such as short-term  obligations  of bank holding  companies,
certificates of deposit, bankers' acceptances and time deposits,  including U.S.
dollar-denominated  instruments  issued or  supported  by the credit of U.S.  or
foreign  banks  or  savings  institutions  having  total  assets  at the time of
purchase in excess of $1 billion.  The  Portfolio  may invest  substantially  in
obligations  of  foreign  banks or  foreign  branches  of U.S.  banks  where the
investment  adviser deems the instrument to present  minimal credit risks.  Such
investments  may  nevertheless  entail  risks in  addition  to those of domestic
issuers,   including  higher   transaction   costs,   less  complete   financial
information,  less stringent regulatory  requirements and less market liquidity.
The Portfolio may also make interest-bearing  savings deposits in commercial and
savings banks in amounts not in excess of 5% of its total assets.

     COMMERCIAL PAPER. The Portfolio may purchase commercial paper rated (i) (at
the time of  purchase)  in the two  highest  rating  categories  of at least two
nationally recognized statistical rating organizations ("Rating  Organizations")
or,  by the only  Rating  Organization  providing  a rating;  or (ii)  issued by
issuers (or, in certain cases guaranteed by persons) with short-term debt having
such  ratings.  These  rating  categories  are  described in the Appendix to the
Statement of Additional  Information.  The  Portfolio may also purchase  unrated
commercial  paper  provided  that such paper is  determined  to be of comparable
quality by the  Portfolio's  investment  adviser in accordance  with  guidelines
approved by the Fund's Board of Directors.

     Commercial paper purchased by the Portfolio may include  instruments issued
by foreign issuers,  such as Canadian  Commercial  Paper ("CCP"),  which is U.S.
dollar-denominated  commercial  paper  issued  by a  Canadian  corporation  or a
Canadian  counterpart  of a U.S.  corporation,  and in Europaper,  which is U.S.
dollar-denominated commercial paper of a foreign issuer, subject to the criteria
stated above for other commercial paper issuers.

     VARIABLE RATE DEMAND NOTES. The Portfolio may purchase variable rate demand
notes, which are unsecured  instruments that permit the indebtedness  thereunder
to vary and provide for periodic  adjustment in the interest rate.  Although the
notes are not normally traded and there may be no active secondary market in the
notes, the Portfolio will be able (at any time or during  specified  periods not
exceeding 13 months,  depending upon the note involved) to demand payment of the
principal  of a note.  The  notes  are not  typically  rated  by  credit  rating
agencies,  but  issuers of  variable  rate  demand  notes must  satisfy the same
criteria as set forth above for issuers of commercial  paper.  If an issuer of a
variable  rate demand note  defaulted on its payment  obligation,  the Portfolio
might be unable to  dispose  of the note  because  of the  absence  of an active
secondary market.  For this or other reasons,  the Portfolio might suffer a loss
to the extent of the  default.  The  Portfolio  invests in variable  rate demand
notes only when the  Portfolio's  investment  adviser  deems the  investment  to
involve  minimal credit risk. The Portfolio's  investment  adviser also monitors
the continuing  creditworthiness  of issuers of such notes to determine  whether
the Portfolio should continue to hold such notes.

                                       7

<PAGE>

     REPURCHASE AGREEMENTS.  The Portfolio may agree to purchase securities from
financial  institutions  subject to the seller's agreement to repurchase them at
an agreed upon time and price  ("repurchase  agreements").  The securities  held
subject to a  repurchase  agreement  may have  stated  maturities  exceeding  13
months, provided the repurchase agreement itself matures in less than 13 months.
Default by or bankruptcy of the seller would,  however,  expose the Portfolio to
possible loss because of adverse market action or delays in connection  with the
disposition of the underlying obligations.

     U.S. GOVERNMENT OBLIGATIONS.  The Portfolio may purchase obligations issued
or  guaranteed  by the U.S.  Government  or its agencies and  instrumentalities.
Obligations of certain agencies and instrumentalities of the U.S. Government are
backed by the full faith and credit of the United  States.  Others are backed by
the right of the issuer to borrow  from the U.S.  Treasury or are backed only by
the credit of the agency or instrumentality issuing the obligation.

     ASSET-BACKED   SECURITIES.   The  Portfolio  may  invest  in   asset-backed
securities which are backed by mortgages,  installment  sales contracts,  credit
card  receivables  or  other  assets  and  collateralized  mortgage  obligations
("CMOs") issued or guaranteed by U.S. Government agencies and, instrumentalities
or issued by private companies.  Asset-backed securities also include adjustable
rate securities.  The estimated life of an asset-backed security varies with the
prepayment experience with respect to the underlying debt instruments.  For this
and other reasons, an asset-backed  security's stated maturity may be shortened,
and the  security's  total return may be difficult  to predict  precisely.  Such
difficulties  are not expected,  however,  to have a  significant  effect on the
Portfolio since the remaining  maturity of any  asset-backed  security  acquired
will be 13 months or less.  Asset-backed  securities  are considered an industry
for industry concentration purposes. See "Investment Limitations." In periods of
falling  interest  rates,  the rate of mortgage  prepayments  tends to increase.
During these periods, the reinvestment of proceeds by a Portfolio will generally
be at lower rates than the rates on the prepaid obligations.

     REVERSE  REPURCHASE  AGREEMENTS.  The  Portfolio  may  enter  into  reverse
repurchase agreements with respect to portfolio securities. A reverse repurchase
agreement   involves  a  sale  by  a  Portfolio  of  securities  that  it  holds
concurrently  with an agreement by the Portfolio to repurchase them at an agreed
upon time and price.  Reverse  repurchase  agreements  involve the risk that the
market value of the securities sold by the Portfolio may decline below the price
at which the  Portfolio is  obligated to  repurchase  them.  Reverse  repurchase
agreements are considered to be borrowings by the Portfolio under the Investment
Company Act of 1940 (the "1940 Act").

     GUARANTEED  INVESTMENT  CONTRACTS.  The Portfolio may make  investments  in
obligations,  such  as  guaranteed  investment  contracts  and  similar  funding
agreements  (collectively,  "GICs"),  issued  by  highly  rated  U.S.  insurance
companies.  A GIC is a general  obligation of the issuing  insurance company and
not a separate account. The Portfolio's  investments in GICs are not expected to
exceed 5% of its total  assets at the time of  purchase  absent  unusual  market
conditions.   GIC  investments  are  subject  to  the  Fund's  policy  regarding
investment in illiquid securities.

     MUNICIPAL  OBLIGATIONS.   In  addition,  the  Portfolio  may,  when  deemed
appropriate by its  investment  adviser in light of the  Portfolio's  investment
objective,  invest  without  limitation  in high quality,  short-term  Municipal
Obligations  issued by state and local  governmental  issuers,  the  interest on
which may be taxable or tax-exempt  for federal  income tax  purposes,  provided
that such  obligations  carry  yields that are  competitive  with those of other
types of Money Market  Instruments  of comparable  quality.  For a more complete
discussion   of  Municipal   Obligations,   see   "Investment   Objectives   and
Policies--Municipal Money Market Portfolio--Municipal Obligations."

     STAND-BY COMMITMENTS. The Portfolio may acquire "stand-by commitments" with
respect  to  Municipal  Obligations  held in its  portfolio.  Under  a  stand-by
commitment, a dealer would agree to purchase at the Portfolio's option specified
Municipal  Obligations  at a  specified  price.  The  acquisition  of a stand-by
commitment may increase the cost, and thereby reduce the yield, of the Municipal
Obligation to which such commitment relates. The Portfolio will acquire stand-by
commitments  solely to  facilitate  portfolio  liquidity  and does not intend to
exercise its rights thereunder for trading purposes.

                                       8

<PAGE>

     WHEN-ISSUED SECURITIES.  The Portfolio may purchase portfolio securities on
a  "when-issued"  basis.  When issued  securities are  securities  purchased for
delivery  beyond the normal  settlement  date at a stated  price and yield.  The
Portfolio will generally not pay for such  securities or start earning  interest
on them until they are received. Securities purchased on a when-issued basis are
recorded as an asset at the time the  commitment is entered into and are subject
to changes in value prior to delivery based upon changes in the general level of
interest rates. The Portfolio  expects that commitments to purchase  when-issued
securities  will not exceed 25% of the value of its total assets absent  unusual
market  conditions.  The  Portfolio  does not  intend  to  purchase  when-issued
securities  for  speculative  purposes but only in furtherance of its investment
objective.

     ELIGIBLE SECURITIES. The Portfolio will only purchase "eligible securities"
that present  minimal credit risks as determined by the  Portfolio's  investment
adviser  pursuant  to  guidelines  adopted by the Board of  Directors.  Eligible
securities  generally include:  (1) U.S. Government  securities,  (2) securities
that are rated at the time of purchase in the two highest  rating  categories by
at least two Rating Organizations  (e.g.,  commercial paper rated "A-1" or "A-2"
by Standard & Poor's Ratings Services ("S&P")), (3) securities that are rated at
the time of purchase by the only Rating  Organization rating the security in one
of its two highest rating categories for such securities,  (4) securities issued
by issuers (or, in certain cases  guaranteed by persons)  with  short-term  debt
having such ratings,  and (5) securities that are not rated and are issued by an
issuer that does not have comparable  obligations rated by a Rating Organization
("Unrated  Securities"),  provided that such  securities are determined to be of
comparable quality to eligible rated securities. For a more complete description
of  eligible  securities,  see  "Investment  Objectives  and  Policies"  in  the
Statement of Additional Information.

     ILLIQUID SECURITIES. The Portfolio will not invest more than 10% of its net
assets in illiquid  securities,  including  repurchase  agreements  which have a
maturity of longer than seven days,  time deposits with  maturities in excess of
seven days,  variable  rate demand notes with demand  periods in excess of seven
days unless the Portfolio's  investment  adviser  determines that such notes are
readily  marketable  and could be sold  promptly at the prices at which they are
valued, GICs, and other securities that are illiquid by virtue of the absence of
a readily  available  market or legal or  contractual  restrictions  on  resale.
Repurchase  agreements  subject to demand are deemed to have a maturity equal to
the notice period.  Securities  that have legal or contractual  restrictions  on
resale but have a readily  available market are not deemed illiquid for purposes
of  this  limitation.  The  Portfolio's  investment  adviser  will  monitor  the
liquidity of such  restricted  securities  under the supervision of the Board of
Directors. See "Investment Objectives and Policies--Illiquid  Securities" in the
Statement of Additional Information.

                        MUNICIPAL MONEY MARKET PORTFOLIO

     The Municipal Money Market Portfolio's  investment  objective is to provide
as high a level of current  interest  income exempt from federal income taxes as
is  consistent  with  maintaining  liquidity  and  stability of  principal.  The
Municipal Money Market Portfolio  invests  substantially  all of its assets in a
diversified  portfolio  of  short-term  Municipal  Obligations,  the interest on
which, in the opinion of bond counsel or counsel to the issuer,  as the case may
be, is exempt from the regular  federal  income  tax.  During  periods of normal
market conditions,  at least 80% of the net assets of the Municipal Money Market
Portfolio  will be  invested in  Municipal  Obligations.  Municipal  Obligations
include securities the interest on which is Tax-Exempt Interest, although to the
extent the  Portfolio  invests in certain  private  activity  bonds issued after
August 7, 1986 ("Alternative Minimum Tax Securities"), a portion of the interest
earned by the Portfolio may constitute an item of tax preference for purposes of
the federal alternative minimum tax ("AMT  Interest").There is no assurance that
the investment objective of the Portfolio will be achieved.

     MUNICIPAL  OBLIGATIONS.  The  Portfolio  invests  in  short-term  Municipal
Obligations  which are  determined  by the  Portfolio's  investment  adviser  to
present minimal credit risks and that meet certain ratings criteria  pursuant to
guidelines established by the Fund's Board of Directors.  The Portfolio may also
purchase Unrated Securities provided that

                                       9

<PAGE>

such  securities  are  determined to be of comparable  quality to eligible rated
securities.  The applicable  Municipal  Obligations ratings are described in the
Appendix to the Statement of Additional Information.

     The Portfolio may hold uninvested cash reserves pending  investment  during
temporary defensive periods or if, in the opinion of the Portfolio's  investment
adviser,  suitable  obligations  bearing Tax-Exempt Interest or AMT Interest are
unavailable. There is no percentage limitation on the amount of assets which may
be held uninvested during temporary defensive periods.  Uninvested cash reserves
will not earn income.

     The two principal  classifications  of Municipal  Obligations  are "general
obligation"  securities and "revenue" securities.  General obligation securities
are secured by the  issuer's  pledge of its full faith,  credit and taxing power
for the payment of principal and interest.  Revenue  securities are payable only
from the revenues derived from a particular  facility or class of facilities or,
in some  cases,  from the  proceeds  of a special  excise tax or other  specific
excise tax or other specific  revenue  source,  such as the user of the facility
being financed.  Revenue securities include private activity bonds which are not
payable from the unrestricted revenues of the issuer.  Consequently,  the credit
quality of private  activity  bonds is  usually  directly  related to the credit
standing of the corporate user of the facility involved.

     Municipal  Obligations may also include "moral obligation" bonds, which are
normally  issued by special purpose public  authorities.  If the issuer of moral
obligation  bonds is unable to meet its debt  service  obligations  from current
revenues,  it may draw on a reserve fund,  the  restoration  of which is a moral
commitment but not a legal obligation of the state or municipality which created
the issuer.

     Although the Municipal  Money Market  Portfolio may invest more than 25% of
its net assets in (i) Municipal Obligations whose issuers are in the same state,
(ii) Municipal Obligations the interest on which is paid solely from revenues of
similar projects,  and (iii) private activity bonds bearing Tax-Exempt Interest,
it does not  currently  intend to do so on a regular  basis.  To the  extent the
Portfolio's  assets are  concentrated in Municipal  Obligations that are payable
from the  revenues of similar  projects or are issued by issuers  located in the
same state, the Portfolio will be subject to the peculiar risks presented by the
laws and  economic  conditions  relating to such states or projects to a greater
extent than it would be if its assets were not so concentrated.

     TAX-EXEMPT DERIVATIVE SECURITIES.  The Municipal Money Market Portfolio may
invest  in  tax-exempt  derivative  securities  such  as  tender  option  bonds,
custodial  receipts,   participations,   beneficial   interests  in  trusts  and
partnership  interests.  A typical tax-exempt  derivative  security involves the
purchase  of an  interest  in a pool of  Municipal  Obligations  which  interest
includes a tender  option,  demand or other  feature,  allowing the Portfolio to
tender  the  underlying  Municipal  Obligation  to a  third  party  at  periodic
intervals and to receive the principal amount thereof. In some cases,  Municipal
Obligations are represented by custodial  receipts  evidencing  rights to future
principal or interest payments, or both, on underlying municipal securities held
by a custodian  and such  receipts  include the option to tender the  underlying
securities  to the sponsor  (usually a bank,  broker-dealer  or other  financial
institution). Although the Internal Revenue Service has not ruled on whether the
interest  received  on  derivative  securities  in  the  form  of  participation
interests or custodial receipts is Tax-Exempt Interest, opinions relating to the
validity of, and the  tax-exempt  status of payments  received by, the Portfolio
from such  derivative  securities  are  rendered  by counsel  to the  respective
sponsors of such derivatives and relied upon by the Portfolio in purchasing such
securities.  Neither the  Portfolio nor its  investment  adviser will review the
proceedings relating to the creation of any tax-exempt  derivative securities or
the basis for such legal opinions.

     WHEN-ISSUED   SECURITIES.   The  Portfolio  may  also  purchase   portfolio
securities on a "when-issued"  basis as described under  "Investment  Objectives
and Policies--Money Market Portfolio--When-Issued Securities."

     STAND-BY COMMITMENTS. The Portfolio may acquire "stand-by commitments" with
respect to Municipal  Obligations  held in its portfolio such as described under
"Investment   Objectives   and   Policies--Money   Market    Portfolio--Stand-By
Commitments."

                                       10

<PAGE>

     ELIGIBLE  SECURITIES.  The  Municipal  Money  Market  Portfolio  will  only
purchase  "eligible  securities" that present minimal credit risks as determined
by the  Portfolio's  investment  adviser  pursuant to guidelines  adopted by the
Board of Directors. For a more complete description of eligible securities,  see
"Investment   Objectives   and   Policies--Money   Market    Portfolio--Eligible
Securities"  and  "Investment  Objectives  and  Policies  in  the  Statement  of
Additional Information."

     ILLIQUID SECURITIES. The Portfolio will not invest more than 10% of its net
assets in  illiquid  securities.  For a more  complete  description  of illiquid
securities,    see   "Investment    Objectives   and   Policies--Money    Market
Portfolio--Illiquid     Securities"    and     "Investment     Objectives    and
Policies--Illiquid Securities" in the Statement of Additional Information.

YEAR 2000
- --------------------------------------------------------------------------------
     Like  other  mutual  funds,   financial  and  business   organizations  and
individuals  around  the  world,  the Fund could be  adversely  affected  if the
computer systems used by the Adviser and the Fund's other service providers,  or
persons with whom they deal, do not properly process and calculate  date-related
information  and data  from and after  January  1,  2000.  This  possibility  is
commonly known as the "Year 2000 Problem." The Year 2000 Problem could also hurt
companies whose securities the Fund holds or securities markets  generally.  The
Fund has been advised by the Adviser,  the Administrators and the Custodian that
they are actively  taking steps to address the Year 2000 Problem with respect to
the computer  systems  that they use and to obtain  assurances  that  comparable
steps are being taken by the Fund's other major service  providers.  While there
can be no  assurance  that  the  Fund's  service  providers  will be  Year  2000
compliant,  the Fund's service providers expect that their plans to be compliant
will be achieved.

INVESTMENT LIMITATIONS
- --------------------------------------------------------------------------------
     The  Money  Market  and  Municipal  Money  Market  Portfolios'   investment
objectives  and policies  described  above may be changed by the Fund's Board of
Directors without shareholder approval. The Portfolios may not, however,  change
the following  investment  limitations  (except as noted) without such a vote of
their  respective  shareholders.  (A more detailed  description of the following
investment  limitations,  together with other investment limitations that cannot
be changed  without a vote of  shareholders,  is contained  in the  Statement of
Additional Information under "Investment Objectives and Policies.")

     The Portfolios may not:

         1. Purchase securities of any one issuer,  other than securities issued
     or guaranteed by the U.S. Government or its agencies and instrumentalities,
     if  immediately  after and as a result of such purchase more than 5% of the
     value of a Portfolio's  total assets would be invested in the securities of
     such issuer, or more than 10% of the outstanding  voting securities of such
     issuer would be owned by a Portfolio, except that up to 25% of the value of
     a  Portfolio's  total  assets  may be  invested  without  regard to such 5%
     limitation.

         2. Borrow money,  except from banks for  temporary  purposes and except
     for reverse repurchase  agreements and then in amounts not in excess of 10%
     of the value of a  Portfolio's  assets at the time of such  borrowing,  and
     only if after such  borrowing  there is asset coverage of at least 300% for
     all borrowings of a Portfolio;  or mortgage,  pledge or hypothecate  any of
     its assets except in connection  with any such borrowing and in amounts not
     in excess of 10% of the value of a  Portfolio's  assets at the time of such
     borrowing; or purchase portfolio securities while borrowing in excess of 5%
     of a Portfolio's net assets are outstanding.  (This borrowing  provision is
     not for  investment  leverage,  but solely to  facilitate  management  of a
     Portfolio's  securities by enabling a Portfolio to meet redemption requests
     where  the   liquidation   of   portfolio   securities   is  deemed  to  be
     disadvantageous or inconvenient.)

                                       11

<PAGE>

     The Money Market Portfolio may not:

         1. Purchase any securities other than Money Market Instruments, some of
     which may be subject to repurchase  agreements,  but the Portfolio may make
     interest-bearing  savings  deposits  in amounts  not in excess of 5% of the
     value of the Portfolio's assets and may make time deposits.

         2. Purchase any securities  which would cause, at the time of purchase,
     less  than 25% of the  value of the total  assets  of the  Portfolio  to be
     invested  in the  obligations  of issuers in the  banking  industry,  or in
     obligations,  such as repurchase  agreements,  secured by such  obligations
     (unless the Portfolio is in a temporary  defensive position) or which would
     cause,  at the time of  purchase,  more  than 25% of the value of its total
     assets to be invested in the obligations of issuers in any other industry.

     So long as it values its portfolio securities on the basis of the amortized
cost method of  valuation  pursuant  to Rule 2a-7 under the 1940 Act,  the Money
Market  Portfolio  will meet the following  limitations  on its  investments  in
addition  to the  fundamental  investment  limitations  described  above.  These
limitations  may be changed  without a vote of  shareholders of the Money Market
Portfolio.

         1.  The  Money  Market  Portfolio  will  limit  its  purchases  of  the
     securities  of any one  issuer,  other  than  issuers  of  U.S.  Government
     securities,  to 5% of its  total  assets,  except  that  the  Money  Market
     Portfolio  may  invest  more  than 5% of its  total  assets  in First  Tier
     Securities of one issuer for a period of up to three business days.  "First
     Tier Securities" include eligible securities that (i) if rated by more than
     one Rating Organization, are rated (at the time of purchase) by two or more
     Rating  Organizations  in the highest rating category for such  securities,
     (ii) if rated by only one  Rating  Organization,  are rated by such  Rating
     Organization in its highest rating category for such securities, (iii) have
     no short-term rating and are comparable in priority and security to a class
     of short-term  obligations of the issuer of such  securities that have been
     rated in accordance with (i) or (ii) above, or (iv) are Unrated  Securities
     that  are  determined  to be of  comparable  quality  to  such  securities.
     Purchases of First Tier  Securities  that come within  categories  (ii) and
     (iv) above will be approved or ratified by the Board of Directors.

         2. The Money Market  Portfolio  will limit its purchases of Second Tier
     Securities, which are eligible securities other than First Tier Securities,
     to 5% of its total assets.

         3. The Money Market  Portfolio  will limit its purchases of Second Tier
     Securities  of one issuer to the  greater  of 1% of its total  assets or $1
     million.

     The Municipal Money Market Portfolio may not:

         1. Purchase any securities which would cause more than 25% of the value
     of the total assets of the Portfolio to be invested at the time of purchase
     in obligations of issuers in the same industry.

     In addition, without shareholder approval, the Portfolio may not change its
policy of investing  during  normal  market  conditions  at least 80% of its net
assets in  obligations  the  interest  on which is  Tax-Exempt  Interest  or AMT
Interest.

PURCHASE AND REDEMPTION OF SHARES
- --------------------------------------------------------------------------------

                               PURCHASE PROCEDURES

     Cash  Preservation  Shares are sold  without a sales  load on a  continuous
basis by the  Distributor.  The  Distributor is located at Four Falls  Corporate
Center,  Conshohocken,  Pennsylvania.  Investors may purchase Cash  Preservation
Shares  by mail,  wire or  exchange  from  another  Cash  Preservation  Class as
described  below.  The minimum  initial  investment in each Portfolio is $1,000.
Subsequent  investments  must be at least  $100  ($1,000  if the  investment  is
transmitted by wire). The Fund reserves the right to reject any purchase order.

                                       12

<PAGE>

     Shareholders  whose  shares  are  held  in the  street  name  account  of a
broker/dealer  and who desire to transfer such shares to the street name account
of another broker/dealer should contact their current broker/dealer.

     Purchases  will be effected at the net asset  value next  determined  after
PFPC, the Fund's transfer agent, has received a purchase order in good order and
the Fund's  custodian  has Federal Funds  immediately  available to it. In those
cases  where  payment  is made by check,  Federal  Funds will  generally  become
available two Business Days after the check is received. A "Business Day" is any
day that both the New York Stock  Exchange (the "NYSE") and the Federal  Reserve
Bank of Philadelphia (the "FRB") are open. On any Business Day, orders which are
accompanied  by Federal  Funds and  received  by the Fund by 12:00 noon  Eastern
Time,  and orders as to which payment has been  converted  into Federal Funds by
12:00 noon Eastern  Time,  will be executed as of 12:00 noon that  Business Day.
Orders  which are  accompanied  by Federal  Funds and received by the Fund after
12:00 noon  Eastern  Time but prior to the close of regular  trading on the NYSE
(generally  4:00 p.m.  Eastern  Time) and  orders as to which  payment  has been
converted  into  Federal  Funds after 12:00 noon  Eastern  Time but prior to the
close of regular  trading on the NYSE on any Business  Day of the Fund,  will be
executed as of the close of regular trading on the NYSE on that Business Day but
will not be entitled to receive dividends  declared on such Business Day. Orders
which are  accompanied by Federal Funds and received by the Fund as of the close
of regular trading on the NYSE or later, and orders as to which payment has been
converted  to Federal  Funds as of the close of  regular  trading on the NYSE or
later on a Business  Day will be  processed as of 12:00 noon Eastern Time on the
following Business Day.

INITIAL INVESTMENT

     BY MAIL--You may purchase Shares in either of the Cash Preservation Classes
by mail by completing and signing the attached  application (the "Application"),
specifying the Portfolio in which you wish to invest,  and mailing it,  together
with a check payable to the order of "Cash  Preservation"  to Cash  Preservation
Portfolios, c/o PFPC, P.O. Box 8916, Wilmington,  Delaware 19899. The check must
also  specify  the  name of the  Portfolio  in  which  you  wish to  invest.  An
Application  will be returned to an investor  unless it contains the name of the
Authorized Dealer from whom it was obtained.

     BY BANK  WIRE--You may purchase  Shares in either of the Cash  Preservation
Classes by having your bank wire  Federal  Funds to the Fund's  custodian,  PFPC
Trust  Company.  Your  bank  may  impose a charge  for  this  service.  The Fund
currently does not charge for effecting wire transfers but reserves the right to
do so in the future.  In order to ensure  prompt  receipt of your Federal  Funds
wire, it is important that you follow these steps:

     A. Telephone the Fund's transfer agent, PFPC,  toll-free (800) 430-9618 and
provide  your  name,   address,   telephone  number,   Social  Security  or  Tax
Identification  Number, the Cash Preservation  Class selected,  the amount being
wired, and by which bank. PFPC will then provide you with a Fund account number.
(Investors  with  existing  accounts  should  also  notify  PFPC prior to wiring
funds.)

     B.  Instruct  your bank to wire the  specified  amount,  together with your
assigned account number, to the custodian:

         PFPC Trust Company, Wilmington, DE 
         ABA-0310-0005-3.
         FROM: (name of investor)
         ACCOUNT NUMBER: (investor's account number with the Portfolio)
         FOR PURCHASE OF: (name of the Portfolio)
         AMOUNT: (amount to be invested)

     C.  Complete  and sign the  Application  and mail it to the  address  shown
thereon.  PFPC will not  process  initial  purchases  until it  receives a fully
completed and signed Application. An Application will be returned to an investor
unless it contains the name of the  Authorized  Dealer (a dealer who has entered
into a  dealer  agreement  with  the  Distributor)  from  whom  it was  obtained
generally.

                                       13

<PAGE>

     Federal Funds must be received by PFPC by 12:00 noon Eastern Time for it to
process  an order as of 12:00 noon on such day.  Federal  Funds  received  after
12:00 noon but prior to the close of regular trading on the NYSE (generally 4:00
p.m.  Eastern  Time) on a  Business  Day will be  processed  as of the  close of
regular  trading on the NYSE on that  Business Day but the Shares  acquired will
not be entitled to receive  dividends  declared on such  Business  Day.  Federal
Funds received after the close of regular  trading on the NYSE on a Business Day
will be processed as of 12:00 noon Eastern Time on the following Business Day.

     BY PAYMENT  FROM  INSURANCE  POLICIES--If  you are a  recipient  of certain
insurance policy payments,  you may purchase Shares by completing and signing an
Application,  including the section which  authorizes your insurance  company to
forward  policy  payments  to  the  Cash  Preservation  Class  indicated  on the
Application, and mailing it to PFPC at the address shown thereon. An Application
will be returned to an investor  unless it contains  the name of the  Authorized
Dealer from whom it was obtained.

     Cash  Preservation  Shares may be purchased in conjunction  with individual
retirement  accounts ("IRAs") and rollover IRAs where PFPC Trust Company acts as
custodian.  For further  information as to applications and annual fees, contact
the Distributor or an Authorized Dealer. To determine whether the benefits of an
IRA are available  and/or  appropriate,  an investor  should  consult with a tax
adviser.

SUBSEQUENT INVESTMENTS

     Once an account  has been  opened,  additional  investments  may be made by
mail,  wire,  exchange,   or  the  automatic  investment  program.  The  minimum
subsequent investment is $100 ($1,000 if payment is by wire).

     BY MAIL--Payment may be made by check or a Federal Reserve Draft payable to
the order of "Cash  Preservation." The check or draft must also specify the name
of the  Portfolio  in which  you  wish to  invest.  Mail  your  payment  to Cash
Preservation  c/o PFPC,  P.O.  Box 8950,  Wilmington,  Delaware  19899.  Federal
Reserve  Drafts are  available  at  national  banks or any state bank which is a
member of the Federal Reserve System.

     BY BANK WIRE--Follow steps A and B above given under "Initial Investment --
By Bank Wire."

     BY EXCHANGE--Follow  the procedures given under "Redemption and Exchange of
Shares -- Exchange Privilege" below.

     BY AUTOMATIC INVESTING--Additional investments may be made automatically by
authorizing PFPC to withdraw funds from your bank account. Investors desiring to
participate  in the  automatic  investing  program  should  call  PFPC at  (800)
430-9618 to obtain the appropriate form.

                        REDEMPTION AND EXCHANGE OF SHARES

     Redemption  orders  are  effected  at the net asset  value  per Share  next
determined  after  receipt of the order in proper  form by the  Fund's  transfer
agent, PFPC. Investors may redeem all or some of their Shares in accordance with
one of the procedures described below.

     BY MAIL--An  investor  may redeem any number of Shares by sending a written
request,  together with any share  certificates  issued to the investor,  to the
Fund's  transfer  agent,  PFPC,  P.O.  Box  8916,  Wilmington,   Delaware  19899
Attention:  Cash Preservation Portfolios. It is recommended that such request be
sent by  registered  or  certified  mail if  share  certificates  accompany  the
request.  Redemption  requests  must be signed by each  shareholder  in the same
manner as the Shares are  registered.  Redemption  requests  for joint  accounts
require the signature of each joint owner.  On redemption  requests of $5,000 or
more,  each signature must be guaranteed  according to the procedures  described
below under "Exchange Privilege."

                                       14

<PAGE>

                      (THIS PAGE INTENTIONALLY LEFT BLANK.)

<PAGE>
<TABLE>
<CAPTION>
                                        CASH PRESERVATION PORTFOLIOS NEW ACCOUNT APPLICATION
               Mail completed application to: PFPC - Attention: Cash Preservation, P.O. Box 8916, Wilmington, DE 19899

<S>                <C>    
- ----------------   -----------------------------------------------------------------------------------------------------------------
1                  PLEASE PRINT                                                                             / / Individual
Registration       _______________________________________________________________________________________  / / Joint Tenant
- ----------------   Owner                                                                                    / / Custodian
                   _______________________________________________________________________________________  / / UGMA__(State)
                   Co-owner*, minor, trust                                                                  / / Trust
                   _______________________________________________________________________________________  / / Corporation
                   Street Address                                                                           / / Other___________
                   _______________________________________________________________________________________
                   City                                                        State           Zip Code

                   * For joint registration, both must sign. The registration will be as joint tenants with the right of 
                     survivorship and not as tenants in common, unless otherwise stated.

- ----------------   -----------------------------------------------------------------------------------------------------------------
2                  Total amount invested (minimum of $1,000 per portfolio) ___________________
Investments        MONEY MARKET PORTFOLIO $ ___________________      MUNICIPAL MONEY MARKET PORTFOLIO  $ ___________________
- ----------------   / / BY CHECK.  Made payable to "Cash Preservation."
                   / / BY WIRE.  Call PFPC Inc. ("PFPC") directly at (800) 430-9618 to obtain a Fund account number and for further
                       instructions. Then, fill in your new fund account number ___________________ .
                   / / BY PAYMENT FROM INSURANCE POLICY.  Recipients of certain insurance policy payments may purchase shares by 
                       authorizing and directing the issuing insurance company to forward payments to the fund. Complete the 
                       "Payment Authorization Form" at the bottom of this application.

- ----------------   -----------------------------------------------------------------------------------------------------------------
3                  Under  penalties  of perjury,  I certify  with my  signature  below that the number  shown in this section of the
Taxpayer           application is my correct taxpayer  identification  number and that I am not subject to backup  withholdings as a
Identification     result of a failure to report all interest or dividends,  or the Internal  Revenue Service has notified me that I
- -----------------  am no longer subject to backup withholding. 
                   If you are subject to backup withholding, check the box in front of the following statement.
                   / / The Internal Revenue Service has notified me that I am subject to backup withholding.

                   __________________________________  or __________________________________  or   _________________________________
                      (Owner's Social Security Number)        (Tax Identification Number)          (Minor's Social Security Number)

- ----------------   -----------------------------------------------------------------------------------------------------------------
4                  A. DIVIDEND ELECTION
Options            Unless you elect otherwise, all dividends will be automatically reinvested in additional shares. If you prefer to
                   be paid in cash each month, check the appropriate box below.
                   / / Pay all dividends in cash.
- ----------------   / / I request the above distributions be sent to the special payee whose address is specified in Section B below.

B.  WITHDRAWAL BY TELEPHONE
If you wish to have the convenience of making  withdrawals by telephone  without  obtaining the usual signature  guarantees,  please
furnish the information  below.  Then, when you wish to withdraw funds,  all you need to do is call PFPC toll-free at (800) 430-9618
and they will process your request.  SHAREHOLDERS  HOLDING SHARE  CERTIFICATES  ARE NOT ELIGIBLE FOR THE SYSTEMATIC  WITHDRAWAL PLAN
BECAUSE SHARE  CERTIFICATES MUST ACCOMPANY ALL WITHDRAWAL  REQUESTS.  It is understood that neither PFPC nor the Fund will be liable
for any loss, liability, cost or expense for acting upon such instructions.

Name in which bank account is established____________________________________________ Bank account number __________________________
</TABLE>

<PAGE>
<TABLE>
<CAPTION>

<S>   <C>                                <C>
      Transit Number  _________________  Full name of commercial bank (not savings bank) ___________________________________________

      Address ___________________________________  City _________________________________________  State ______  Zip _______________

C.  TELEPHONE EXCHANGE

Your account will  automatically  provide for telephone  exchange of shares of one class for shares of another class. Then, when you
wish to exchange shares,  all you need to do is call PFPC Inc.  ("PFPC"),  toll-free at (800) 430-9618.  SHAREHOLDERS  HOLDING SHARE
CERTIFICATES,  HOWEVER,  MAY NOT EXCHANGE SHARES BY TELEPHONE BECAUSE SHARE CERTIFICATES MUST ACCOMPANY ALL EXCHANGE  REQUESTS.  The
same registration and address will be used as listed on this form under  "Registration."  It is understood that neither PFPC nor the
Fund will be liable for any loss,  liability,  cost or  expense  for  following  the  procedures  described  below or for  following
instructions  communicated by telephone that if reasonably believes to be genuine.  
IF YOU DO NOT WISH THIS PRIVILEGE, PLEASE CHECK THIS BOX. / /

The Fund's telephone  transaction  procedures include the following measures:  (1) requiring the appropriate  telephone  transaction
privilege forms; (2) requiring the caller to provide the names of the account owners, the account social security number and name of
the Fund,  all of which must match the Fund's  records;  (3) requiring  the Fund's  service  representative  to complete a telephone
transaction  form,  listing all of the above caller  identification  information;  (4) permitting  exchanges only if the two account
registrations  are identical;  (5) requiring that  redemption  proceeds be sent only by check to the account owners of record at the
address of record,  or by wire only to the owners of record at the bank account of record;  (6) sending a written  confirmation  for
each  telephone  transaction  to the owners of record at the  address  of record  within  five (5)  business  days of the call;  and
maintaining tapes of telephone transactions for six months, if the Fund elects to record shareholder telephone transactions.

For accounts held of record by a broker-dealer, trustee, custodian or other agent, additional documentation or information regarding
the scope of a caller's authority is required.  Finally, for telephone transactions in accounts held jointly, additional information
regarding other account holders is required. Telephone transactions will not be permitted in connection with IRA or other retirement
plan accounts or by attorney-in-fact under power of attorney.

D.  ADDITIONAL EXCHANGE PRIVILEGE
/ / I accept the Additional Exchange provisions on the reverse side of this Application with respect to the Participating Classes.

                                          --------------------------------------
                                                        (Signature)
E. AUTOMATIC INVESTING
This program provides for investments to be made  automatically,  by authorizing  PFPC to withdraw funds from your bank account.  An
initial minimum  investment of $1,000,  and subsequent  investment of at least $100 are required.  The program  requires  additional
information so that PFPC may contact your bank to make sure the arrangement is properly established.
/ / Check here and the proper form will be sent to you.

F. FREE CHECK WRITING PRIVILEGE
/ / Check box if you wish to take advantage of the Free Check Writing  Privilege. SHAREHOLDERS  HOLDING SHARE  CERTIFICATES  ARE NOT
ELIGIBLE FOR CHECK WRITING PRIVILEGES BECAUSE SHARE  CERTIFICATES MUST ACCOMPANY ALL TRANSACTION  REQUESTS.  If you have checked the
box above,  please be sure to complete the signature card below. Your checkbook should arrive within three to four weeks. A separate
checkbook is issued for each Cash Preservation Portfolio.

                                         PLEASE TURN OVER TO COMPLETE APPLICATION.

- ------------------------------------------------------------------------------------------------------------------------------------
                                             CASH PRESERVATION PORTFOLIOS SIGNATURE CARD

                   Complete only if check writing privilege is selected.

                   Registration:___________________________________________________________________________________________________

                                ____________________________________________________________________________________________________
                                Please fill out exactly as in "Registration" in Section 1 of the New Account Application.

                   Authorizing signatures(s)*   Date Signed: ___________________________________________________

                   1. __________________________________________________________   2._______________________________________________

                   / / Check if one signature is required.               / / Check if two signatures are required.
                   * All owners must sign. If a corporation, a corporate resolution naming the individual(s) authorized  above  must
                     accompany this signature card.

                   For internal use of PFPC only: Acct. #___________________________________

</TABLE>

<PAGE>

<TABLE>
<CAPTION>
<S>                <C>
                                                      CHECK WRITING CONDITIONS

                   I/we hereby authorize PNC Bank, National  Association ("PNC Bank") to honor checks drawn by me/us on this (these)
                   account(s).
                   I/we fully understand that:
                   (1) if this card is signed by more than one person, all checks will require all signatures  unless  indicated  to
                       the contrary on the reverse on this card;
                   (2) if any of the shares in this (these)  account(s) is (are) represented by share  certificates,  this privilege
                       does not apply;
                   (3) checks must be drawn for $100 or more;
                   (4) this privilege may be terminated at any time by PNC Bank or the Fund, and neither shall incur  any  liability
                       to me/us for honoring such checks, for effecting  redemptions to pay such checks,  or  for  returning  checks
                       which have not been accepted; and
                   (5) this privilege is subject to the terms and  conditions  set forth in the prospectus of the Cash  Preservation
                       Portfolios.

                            For assistance in completing this Application call COUNSELLORS (800) 888-9723
- ------------------------------------------------------------------------------------------------------------------------------------

- ----------------   -----------------------------------------------------------------------------------------------------------------
5                  Citizenship: / / U.S.  / / Other ______________________ Please provide Phone Number(______)______________________
Signatures         
                   Sign below exactly as printed in Registration.
                   I (we) am (are) of legal age and have read the prospectus.  I (we) hereby certify that each of the persons listed
- ----------------   below has been duly  elected,  and is now legally  holding the office set below his name and has the authority to
                   make this authorization. 
                   Please print titles below if signing on behalf of a business or trust.

                   ______________________________________________________     ______________________________________________________
                                         (Signature)                                              (Signature)

                    ______________________________________________________    ______________________________________________________
                       (President, Trustee, General Partner or Agent)         (Co-owner, Secretary of Corporation, Co-trustee, etc.)


- ----------------   -----------------------------------------------------------------------------------------------------------------
6                  MUST BE COMPLETED BY DEALER
Investment         
Dealer             ______________________________________________________     ______________________________________________________
                   Firm Name                                                  Representative's Name (print)
- ----------------   
                   ______________________________________________________     ______________________________________________________
                   Branch Street Address                                      Representative Number

                   ______________________________________________________     ______________________________________________________
                   Representative's Signature                                 Date

- ----------------   -----------------------------------------------------------------------------------------------------------------
7                  COMPLETE ONLY IF INVESTING THROUGH AN INSURANCE COMPANY
Insurance                                                      PAYMENT AUTHORIZATION FORM
Proceeds           
- ----------------   TO:____________________________________________________    RE:___________________________________________________
                      Insurance Company                                          Investor Name

                      ______________________________________________________     ___________________________________________________
                      Address                                                    Policy Number

                      ______________________________________________________     ___________________________________________________
                      City, State, Zip Code                                      Policy Number

You are hereby authorized to issue all checks representing policy payment(s) 
under the above referenced policy (policies) to "Cash Preservation" and to 
send such payments directly to such fund at the following address:  
                                  c/o PFPC Inc.                                 ____________________________________________________
                                      P.O. Box 8916                             Signature of Investor
                                      Wilmington, Delaware  19899
                                                                                ____________________________________________________
                                                                                Date
</TABLE>

<PAGE>

     BY FUND  CHECK--An  investor may request  that the Fund provide  redemption
checks drawn on a particular Cash Preservation Class. SHAREHOLDERS HOLDING SHARE
CERTIFICATES  ARE NOT ELIGIBLE FOR THIS CHECK  WRITING  PRIVILEGE  BECAUSE SHARE
CERTIFICATES MUST ACCOMPANY ALL REDEMPTION REQUESTS. Checks will be sent only to
the registered  owner(s) and only to the address of record.  Investors may issue
checks  made  payable  to the order of any person in the amount of $100 or more.
The redemption is not effective  until the check is processed and cleared by the
transfer  agent,  and  dividends  are earned until the  redemption  is effected.
Because  dividends  accrue daily, a check should not be used to close an account
as a small  balance is likely to result.  There is no charge to the investor for
redemption by check. If a shareholder who has check writing privileges exchanges
funds from one Cash Preservation Class into another Cash Preservation  Class, he
or she will  automatically  receive a checkbook for the new account (allow three
to four weeks for delivery).  The Fund or PNC Bank may terminate this redemption
service at any time, and neither shall incur any liability for honoring  checks,
for effecting  redemptions to pay checks, or for returning checks which have not
been accepted.

PAYMENT OF REDEMPTION PROCEEDS

     Redemption  proceeds  will be  mailed by check to your  registered  address
unless you have designated in your Application or Telephone  Authorization  Form
that such  proceeds are to be sent by wire  transfer to a specified  checking or
savings  account.  If  proceeds  are to be sent by wire  transfer,  a  telephone
redemption  request  received prior to the close of regular  trading on the NYSE
will result in redemption proceeds being wired to the investor's bank account on
the next day that a wire transfer can be effected.  The minimum  redemption  for
proceeds sent by wire  transfer is $1,000.  There is no maximum  redemption  for
proceeds sent by wire transfer.  The Fund may modify this redemption  service at
any time or charge a service fee upon prior  notice to  shareholders.  No fee is
currently contemplated.

ADDITIONAL REDEMPTION INFORMATION

     The Fund  ordinarily will make payment for all Shares redeemed within seven
days after  receipt by the Fund's  transfer  agent of a request in proper  form.
However,  Shares  purchased  by check  will not be  redeemed  for a period up to
fifteen days after their purchase,  pending a  determination  that the check has
cleared.  This  procedure  does not apply to Shares  purchased by wire  payment.
During the period prior to the time the Shares are  redeemed,  dividends on such
Shares will accrue and be payable,  and an investor will be entitled to exercise
all other rights of beneficial ownership.

     The Fund imposes no charge when Shares are redeemed.  The Fund reserves the
right to redeem  any  account in a Cash  Preservation  Class  involuntarily,  on
thirty days'  notice,  if such  account  drops below $500 and during such 30-day
period the shareholder does not increase such account to at least $500.  Payment
for Shares  redeemed may be postponed  or the right of  redemption  suspended as
provided by the rules of the Securities and Exchange Commission.

EXCHANGE PRIVILEGE

     Shareholders who wish to exchange Shares of one Cash Preservation Class for
another Cash Preservation  Class may do so by mail or by telephone.  In addition
to exchanges between Cash Preservation Classes, shareholders may exchange Shares
of a Cash  Preservation  Class for  shares  of the RBB  Class of the  Government
Securities  Portfolio (the "Participating  Class") by mail or telephone provided
they have  completed  the  appropriate  section of the  Application  beforehand.
Shares  of the  Participating  Class may be  acquired  by  exchange  at the next
determined public offering price, including sales charges, if any, applicable to
such  shares.  In order to establish a  systematic  withdrawal  plan for the new
account,  an exchanging  shareholder must file a written  request.  The Fund and
PFPC reserve the right to limit, amend or terminate these exchange privileges at
any time  upon 60 days  written  notice  to  shareholders.  No  exchange  fee is
currently imposed for exchanges;  however, the Fund reserves the right to charge
shareholders  an  exchange  fee of  $5.00  for  each  exchange.  In the  case of
shareholders  holding share  certificates,  the certificates  must accompany the
request  for an  exchange.  An  exchange of Shares will be treated as a sale for
federal tax purposes.

                                       15

<PAGE>

     DETAILED INSTRUCTIONS REQUIRED. A request for an exchange of Shares must be
sufficiently detailed to enable PFPC to complete the exchange in accordance with
the shareholder's wishes. The request must name the Portfolio and account number
from which the exchange is to be made.  It must also name the Portfolio to which
the exchange is to be made and the account  number,  if to an existing  account.
The  request  must  specify the amount of money or Shares to be  exchanged.  New
accounts will be established with the same  registration  and address,  and with
the same options as the account from which the exchange is made--an  Application
is not  needed.  If the  registration  or  address  of the new  account is to be
different  in any respect,  the request  must be in writing with all  signatures
guaranteed.  A signature guarantee may be obtained from a domestic bank or trust
company,  broker,  dealer,  clearing  agency  or  savings  associations  who are
participants  in a  medallion  program  recognized  by the  Securities  Transfer
Association. The three recognized medallion programs are the Securities Transfer
Agents Medallion Program (STAMP),  Stock Exchanges  Medallion Program (SEMP) and
New York Stock  Exchange,  Inc.  Medallion  Signature  Program (MSP).  Signature
guarantees that are not part of these programs will not be accepted.

     EXCHANGE  BY  MAIL--Send  a  written  request   (together  with  any  share
certificates  issued to the investor) to: Cash  Preservation  c/o PFPC, P.O. Box
8916, Wilmington, Delaware 19899. The request must be signed by all shareholders
exactly as their names appear on the Fund's records.

     ACCOUNT MINIMUMS.  If the exchange is to a new account, the dollar value of
Shares acquired must equal or exceed the Portfolio's  minimum for a new account;
if to an existing account, the dollar value must equal or exceed the Portfolio's
minimum  for  subsequent  investments.   If  any  amount  remains  in  the  Cash
Preservation  Class from which the exchange is being made,  such amount must not
drop below the minimum account value required by that Portfolio.

TELEPHONE TRANSACTIONS

     Shareholders  are  automatically  provided with this option when opening an
account,  unless they indicate on the  Application  that they do not wish to use
this  privilege.  SHAREHOLDERS  HOLDING  SHARE  CERTIFICATES  MAY NOT  REDEEM OR
EXCHANGE  SHARES BY TELEPHONE  BECAUSE  SHARE  CERTIFICATES  MUST  ACCOMPANY ALL
EXCHANGE AND  REDEMPTION  REQUESTS.  To add this feature to an existing  account
that  previously  did  not  provide  for  this  option,  a  Telephone   Exchange
Authorization  Form must be filed with PFPC.  This form is available  from PFPC.
Once this election has been made,  the  shareholder  may simply  contact PFPC by
telephone  to request the  redemption  or exchange  by calling  (800)  430-9618.
Neither  the Fund,  the  Portfolios,  the  Distributor,  PFPC nor any other Fund
Agent, will be liable for any loss, liability, cost or expense for following the
Fund's  telephone  transaction  procedures  described  below  or  for  following
instructions  communicated  by  telephone  that they  reasonably  believe  to be
genuine.

     The Fund's telephone transaction procedures include the following measures:
(1)  requiring  the  appropriate  telephone  transaction  privilege  forms;  (2)
requiring  the caller to provide  the names of the account  owners,  the account
social  security  number and name of the portfolio,  all of which must match the
Fund's records;  (3) requiring the Fund's service  representative  to complete a
telephone  transaction  form,  listing  all of the above  caller  identification
information;  (4) permitting exchanges only if the two account registrations are
identical;  (5) requiring that redemption  proceeds be sent only by check to the
account owners of record at the address of record, or by wire only to the owners
of record at the bank account of record; (6) sending a written  confirmation for
each  telephone  transaction  to the  owners of record at the  address of record
within  five  (5)  business  days of the  call;  and (7)  maintaining  tapes  of
telephone  transactions for six months, if the Fund elects to record shareholder
telephone  transactions.  For accounts held of record by  broker-dealers  (other
than the Distributor),  financial  institutions,  securities dealers,  financial
planners or other  industry  professionals,  trustee,  custodian or other agent,
additional  documentation  or  information  regarding  the  scope of a  caller's
authority is required.  Finally,  for  telephone  transactions  in accounts held
jointly,  additional  information  regarding  other account holders is required.
Telephone  transactions  will not be permitted in  connection  with IRA or other
retirement plan accounts or by attorney-in-fact under power of attorney.

                                       16

<PAGE>

NET ASSET VALUE
- --------------------------------------------------------------------------------
     The net  asset  value  per share of each  class of the  Portfolios  for the
purpose of pricing purchase and redemption  orders is determined twice each day,
once as of 12:00 noon Eastern  Time and once as of the close of regular  trading
on the NYSE on each weekday with the exception of those holidays on which either
the NYSE or the FRB is closed. Currently, the NYSE is closed on weekends and the
customary  national business holidays of New Year's Day, Dr. Martin Luther King,
Jr. Day,  Presidents' Day, Good Friday,  Memorial Day,  Independence  Day, Labor
Day,  Thanksgiving  Day  and  Christmas  Day  and on  the  preceding  Friday  or
subsequent Monday when one of these holidays falls on a Saturday or Sunday.  The
FRB is currently  closed on weekends and the same  holidays on which the NYSE is
closed, as well as Veterans' Day and Columbus Day. The net asset value per share
of  each  class  of a  Portfolio  is  calculated  by  adding  the  value  of the
proportionate  interest  of the class in the  Portfolio's  securities,  cash and
other  assets,  deducting  the actual and accrued  liabilities  of the class and
dividing the result by the number of  outstanding  shares of the class.  The net
asset value per share of each class of the Fund is determined  independently  of
any of the Fund's other classes.

     The Fund seeks to maintain for each of the  Portfolios a net asset value of
$1.00 per share for  purposes  of  purchases  and  redemptions  and  values  its
portfolio  securities  on the basis of the  amortized  cost method of  valuation
described  in  the  Statement  of  Additional   Information  under  the  heading
"Valuation of Shares."  There can be no assurance that net asset value per share
will not vary.

     With the approval of the Board of Directors,  a Portfolio may use a pricing
service,  bank  or  broker-dealer  experienced  in such  matters  to  value  the
Portfolio's  securities.  A more  detailed  discussion  of net  asset  value and
security valuation is contained in the Statement of Additional Information.

MANAGEMENT
- --------------------------------------------------------------------------------

                               BOARD OF DIRECTORS

     The  business  and affairs of the Fund and each  investment  portfolio  are
managed under the direction of the Fund's Board of Directors. The Fund currently
operates or proposes to operate seventeen separate investment  portfolios.  Each
of the Cash Preservation  Classes  represents  interests in one of the following
such investment  portfolios:  the Money Market Portfolio and the Municipal Money
Market Portfolio.

INVESTMENT ADVISER

     BIMC,  an indirect  majority-owned  subsidiary  of PNC Bank,  serves as the
investment adviser for each of the Portfolios. BIMC has its principal offices at
Bellevue Park Corporate  Center,  400 Bellevue  Parkway,  Wilmington,  Delaware,
19809.  PNC Bank and its  subsidiaries  currently  manage over $45.9  billion of
assets,  of which  approximately  $31.4  billion are mutual  funds.  PNC Bank, a
national  bank  whose  principal   business   address  is  1600  Market  Street,
Philadelphia,  Pennsylvania 19103, is a wholly-owned  subsidiary of PNC Bancorp,
Inc. PNC Bancorp,  Inc. is a bank holding company and a wholly-owned  subsidiary
of PNC Bank Corp., a multi-bank holding company.

     As investment  adviser to the Portfolios,  BIMC manages such Portfolios and
is responsible for all purchases and sales of portfolio securities.  In entering
into Portfolio  transactions  for a Portfolio with a broker,  BIMC may take into
account  the  sale  by  such  broker  of  shares  of the  Fund,  subject  to the
requirements of best execution. The agreement between BIMC and RBB, with respect
to the Money Market  Portfolio,  provides  for BIMC to also assist  generally in
supervising  the operations of such  Portfolio,  and to maintain the Portfolio's
financial accounts and records. These administrative  responsibilities have been
delegated to PFPC, as described below.

                                       17

<PAGE>

     For the services provided to and expenses assumed by it with respect to the
Money Market Portfolio, BIMC is entitled to receive the following fees, computed
daily and payable monthly based on a Portfolio's  average daily net assets: .45%
of the first $250 million; .40% of the next $250 million; and .35% of net assets
in excess of $500 million.  For the services provided to and expenses assumed by
it with respect to the  Municipal  Money Market  Portfolio,  BIMC is entitled to
receive the  following  fees,  computed  daily and payable  monthly based on the
Portfolio's  average daily net assets:  .35% of the first $250 million;  .30% of
the next $250 million;  and .25% of net assets in excess of $500  million.  BIMC
may in its discretion  from time to time agree to waive  voluntarily  all or any
portion of its advisory fee for any Portfolio.

     For the Fund's fiscal year ended August 31, 1998, the Fund paid  investment
advisory fees  aggregating  .24% and .08% of the average net assets of the Money
Market  Portfolio and the Municipal Money Market  Portfolio,  respectively.  For
that same  period,  BIMC waived  approximately  .12% and .26% of the average net
assets of the Money Market  Portfolio and the Municipal Money Market  Portfolio,
respectively.

     PNC Bank was formerly  sub-adviser to the Portfolios and provided research,
credit analysis and recommendations with respect to the Portfolios'  investments
and supplied  certain  computer  facilities,  personnel and other services.  The
facilities,  personnel,  services and related  expenses have been transferred to
BIMC and in return,  BIMC's  obligation to pay a portion of the sub-advisory fee
to PNC Bank has been  terminated.  For its sub-advisory  services,  PNC Bank was
entitled to receive from BIMC an amount equal to 75% of the investment  advisory
fee paid by the  Portfolios to BIMC. The  sub-advisory  fees paid by BIMC to PNC
Bank had no effect on the services  provided by BIMC and the fees payable by the
Portfolios  for  these  services  are  described  further  in the  Statement  of
Additional Information under "Management of the Company."

ADMINISTRATOR

     PFPC serves as the  administrator  for the Municipal Money Market Portfolio
and generally  assists such Portfolio in all aspects of its  administration  and
operations,  including  matters relating to the maintenance of financial records
and accounting.  PFPC is entitled to an  administration  fee, computed daily and
payable  monthly at .10% of  average  daily net  assets of the  Municipal  Money
Market Portfolio.  Pursuant to its advisory agreement with the Fund with respect
to the Money Market  Portfolio,  BIMC provides  administrative  services to such
Portfolio  pursuant  to the same  terms,  but has  delegated  to PFPC all of its
accounting and  administrative  obligations under such advisory  agreement.  The
Fund  has  agreed  to  pay  directly  to  PFPC  the  fees  for   accounting  and
administrative  services  to the Money  Market  Portfolio  which PFPC would have
received  directly  from  BIMC.  Such  arrangement  has no  effect  on the total
advisory  and  administrative  fees payable by such  Portfolio  to BIMC.  PFPC's
principal business address is 400 Bellevue Parkway, Wilmington, Delaware 19809.

TRANSFER AGENT, DIVIDEND DISBURSING AGENT AND CUSTODIAN

     PFPC Trust  Company  serves as the Fund's  custodian  and PFPC, an indirect
wholly-owned  subsidiary  of PNC Bank  Corp.,  will  succeed PNC Bank,  National
Association ("PNC Bank") as the Fund's custodian pursuant to an assignment. PFPC
serves as the Fund's  transfer  agent and dividend  disbursing  agent.  PFPC may
enter into shareholder  servicing agreements with registered  broker/dealers who
have entered into dealer  agreements  with the  Distributor for the provision of
certain shareholder support services to customers of such broker/dealers who are
shareholders  of the Portfolios.  The services  provided and the fees payable by
the Fund for  these  services  are  described  in the  Statement  of  Additional
Information   under   "Investment    Advisory,    Distribution   and   Servicing
Arrangements."

DISTRIBUTOR

     Provident Distributors, Inc. (the "Distributor"), with a principal business
address at Four Falls Corporate Center,  West Conshohocken,  Pennsylvania 19428,
acts as  distributor of the Shares of each of the Cash  Preservation  Classes of
the  Fund  pursuant  to  a  distribution  agreement  dated  May  29,  1998  (the
"Distribution Agreement").

                                       18

<PAGE>

EXPENSES

     The expenses of each  Portfolio  are deducted from the total income of such
Portfolio  before  dividends are paid. Any general expenses of the Fund that are
not readily  identifiable as belonging to a particular  investment  portfolio of
the Fund will be allocated among all investment  portfolios of the Fund based on
the relative net assets of the  investment  portfolios at the time such expenses
were  accrued.  The  Cash  Preservation  Classes  of  the  Fund  pay  their  own
distribution  fees, and may pay a different share than other classes of the Fund
of other expenses  (excluding advisory and custodial fees) if these expenses are
actually incurred in a different amount by the Cash  Preservation  Classes or if
they receive different services.

     The  investment  adviser may assume  additional  expenses of the Portfolios
from time to time. In certain circumstances,  it may assume such expenses on the
condition  that it is reimbursed by the Portfolios for such amounts prior to the
end of a fiscal year. In such event, the reimbursement of such amounts will have
the effect of  increasing a Portfolio's  expense ratio and of lowering  yield to
investors.

     For the Fund's fiscal year ended August 31, 1998 the Fund's total  expenses
were 9.84% of the average daily net assets with respect to the Cash Preservation
Class of the Money  Market  Portfolio  (not  taking  into  account  waivers  and
reimbursements  of 8.89%) and were 23.15% of the  average  daily net assets with
respect to the Cash  Preservation  Class of the Municipal Money Market Portfolio
(not taking into account waivers and reimbursements of 22.17%).

DISTRIBUTION OF SHARES
- --------------------------------------------------------------------------------
     The Board of  Directors of the Fund  approved and adopted the  Distribution
Agreement  and  separate  Plans  of   Distribution   for  each  of  the  Classes
(collectively,  the  "Plans")  pursuant to Rule 12b-1 under the 1940 Act.  Under
each of the Plans, the Distributor is entitled to receive from the relevant Cash
Preservation  Class a distribution fee, which is accrued daily and paid monthly,
of up to .65% on an  annualized  basis of the  average  daily net  assets of the
relevant Cash Preservation  Class. The actual amount of such compensation  under
the  Plans  is  agreed  upon  by  the  Fund's  Board  of  Directors  and  by the
Distributor.  Under each of the  Distribution  Agreement,  the  Distributor  has
agreed to accept compensation for its services thereunder and under the relevant
Plan in the  amount  of .40% on an  annualized  basis of the  average  daily net
assets of the relevant Cash  Preservation  Class in any year. Such  compensation
may be increased,  up to the amount  permitted in the Plan, with the approval of
the Fund's Board of Directors.  Pursuant to the conditions of an exemptive order
granted by the Securities and Exchange  Commission (the "SEC"),  the Distributor
has agreed to waive its fee with respect to a Cash Preservation Class on any day
to the extent  necessary  to assure that the fee  required to be accrued by such
Class does not exceed the  income of such Class on that day.  In  addition,  the
Distributor may, in its discretion,  voluntarily  waive from time to time all or
any portion of its distribution fee.

     Under the Distribution Agreement and the relevant Plan, the Distributor may
reallocate  an  amount  up to  the  full  fee  that  it  receives  to  financial
institutions,   including  to  Authorized  Dealers,  based  upon  the  aggregate
investment  amounts  maintained by and services  provided to shareholders of any
relevant Class serviced by such financial institutions. The Distributor may also
reimburse Authorized Dealers for other expenses incurred in the promotion of the
sale of Fund shares.  The Distributor and/or Authorized Dealers pay for the cost
of  printing  (excluding  typesetting)  and  mailing  to  prospective  investors
prospectuses  and other  materials  relating  to the Fund as well as for related
direct mail, advertising and promotional expenses.

     Each of the Plans obligates the Fund, during the period it is in effect, to
accrue and pay to the Distributor on behalf of each Cash Preservation  Class the
fee agreed to under the Distribution Agreement. Payments under the Plans are not
based on expenses  actually  incurred by the  Distributor,  and the payments may
exceed distribution expenses actually incurred.

                                       19

<PAGE>

DIVIDENDS AND DISTRIBUTIONS
- --------------------------------------------------------------------------------
     The Fund will distribute substantially all of the net investment income and
net  realized  capital  gains,  if  any,  of  each  of the  Portfolios  to  each
Portfolio's  shareholders.  All  distributions  are  reinvested  in the  form of
additional full and fractional  Shares of the relevant Cash  Preservation  Class
unless a shareholder elects otherwise.

     The net investment income (not including any net short-term  capital gains)
earned by each  Portfolio  will be  declared  as a dividend on a daily basis and
paid monthly.  Dividends are payable to shareholders of record immediately prior
to the  determination of net asset value made as of the close of regular trading
on the NYSE. Net short-term  capital gains, if any, will be distributed at least
annually.

TAXES
- --------------------------------------------------------------------------------
     Distributions  from the Money Market Portfolio will generally be taxable to
shareholders.   It  is  expected  that  all,  or  substantially  all,  of  these
distributions will consist of ordinary income. You will be subject to income tax
on these distributions regardless whether they are paid in cash or reinvested in
additional  shares.  The one major  exception  to these tax  principles  is that
distributions on shares held in an IRA (or other tax-qualified plan) will not be
currently taxable.

     Distributions  from the Municipal  Money Market  Portfolio  will  generally
constitute  tax-exempt  income for shareholders for federal income tax purposes.
It is possible,  depending upon the Portfolio's  investments,  that a portion of
the  Portfolio's  distributions  could be taxable to  shareholders  as  ordinary
income or capital gains, but it is not expected that this will be the case.

     Although distributions from the Municipal Money Market Portfolio are exempt
for federal income tax purposes,  they will generally  constitute taxable income
for state and local income tax purposes except that, subject to limitations that
vary  depending on the state,  distributions  from  interest  paid by a state or
municipal entity may be exempt from tax in that state.

     Interest on  indebtedness  incurred by a  shareholder  to purchase or carry
shares of the Municipal Money Market Portfolio  generally will not be deductible
for federal income tax purposes.

     You should note that a portion of the exempt-interest dividends paid by the
Municipal  Money Market  Portfolio may  constitute an item of tax preference for
purposes   of   determining   federal   alternative   minimum   tax   liability.
Exempt-interest  dividends  will also be  considered  along with other  adjusted
gross income in determining  whether any Social Security or railroad  retirement
payments received by you are subject to federal income taxes.

     The  foregoing  is only a summary of certain tax  considerations  under the
current law,  which may be subject to change in the future.  You should  consult
your tax adviser for further information regarding federal,  state, local and/or
foreign tax consequences relevant to your specific situation.

DESCRIPTION OF SHARES
- --------------------------------------------------------------------------------
     The Fund has  authorized  capital of thirty billion shares of Common Stock,
$.001 par  value  per  share,  of which  18.326  billion  shares  are  currently
classified  into 97  different  classes  of Common  Stock (see  "Description  of
Shares" in the Statement of Additional Information).

     The Fund  offers  multiple  classes  of shares in each of its Money  Market
Portfolio  and  Municipal  Money  Market   Portfolio  to  expand  its  marketing
alternatives  and to broaden its range of services to different  investors.  The
expenses of the various  classes  within  these  Portfolios  vary based upon the
services provided, which may affect performance.

                                       20

<PAGE>

Each class of Common  Stock of the Fund has a separate  Rule 12b-1  distribution
plan. Under the Distribution  Agreement and pursuant to each of the distribution
plans,  the  Distributor is entitled to receive from each class as  compensation
for  distribution  services  provided to that class a distribution  fee based on
average daily net assets.  A salesperson or any other person entitled to receive
compensation for servicing Fund shares may receive  different  compensation with
respect to different classes in a Portfolio of the Fund. An investor may contact
the Fund's  distributor by calling  1-800-888-9723  to request more  information
concerning other classes available.

     THIS  PROSPECTUS AND THE STATEMENT OF ADDITIONAL  INFORMATION  INCORPORATED
HEREIN RELATE PRIMARILY TO THE CASH PRESERVATION CLASSES OF THE MONEY MARKET AND
MUNICIPAL MONEY MARKET PORTFOLIOS AND DESCRIBE ONLY THE INVESTMENT OBJECTIVE AND
POLICIES,  OPERATIONS,   CONTRACTS  AND  OTHER  MATTERS  RELATING  TO  THE  CASH
PRESERVATION CLASSES OF THESE PORTFOLIOS.

     Each  share  that  represents  an  interest  in a  Portfolio  has an  equal
proportionate interest in the assets belonging to such Portfolio with each other
share that  represents an interest in such  Portfolio,  even where a share has a
different class designation than another share  representing an interest in that
Portfolio.  Shares of the Fund do not have preemptive or conversion rights. When
issued for payment as described in this  Prospectus,  Shares of the Fund will be
fully paid and non-assessable.

     The Fund currently does not intend to hold annual  meetings of shareholders
except  as  required  by the 1940 Act or other  applicable  law.  The law  under
certain circumstances provides shareholders with the right to call for a meeting
of shareholders to consider the removal of one or more directors.  To the extent
required  by law,  the Fund will  assist in  shareholder  communication  in such
matters.

     Holders of shares of each of the Portfolios  will vote in the aggregate and
not by class on all matters,  except where otherwise  required by law.  Further,
shareholders of all investment portfolios of the Fund will vote in the aggregate
and not by portfolio  except as  otherwise  required by law or when the Board of
Directors determines that the matter to be voted upon affects only the interests
of the shareholders of a particular investment portfolio.  (See the Statement of
Additional Information under "Additional Information Concerning Fund Shares" for
examples of when the 1940 Act requires voting by investment portfolio or class.)
Shareholders  of the Fund are  entitled  to one vote for each  full  share  held
(irrespective of class or portfolio) and fractional votes for fractional  shares
held.  Voting rights are not cumulative  and,  accordingly,  the holders of more
than 50% of the  aggregate  shares of Common  Stock of the Fund may elect all of
the directors.

     As of November 16, 1998, to the Fund's knowledge,  no person held of record
or  beneficially  25% or more of the  outstanding  shares of all  classes of the
Fund.

OTHER INFORMATION
- --------------------------------------------------------------------------------

REPORTS AND INQUIRIES

     Shareholders  will receive  unaudited  semi-annual  reports  describing the
Fund's  investment   operations  and  annual  financial  statements  audited  by
independent accountants.  Shareholder inquiries should be addressed to PFPC, the
Fund's transfer agent,  Bellevue Park Corporate  Center,  400 Bellevue  Parkway,
Wilmington, Delaware 19809 (800) 430-9618.

                                       21

<PAGE>

                      (THIS PAGE INTENTIONALLY LEFT BLANK.)

<PAGE>

================================================================================
NO  PERSON  HAS  BEEN  AUTHORIZED  TO  GIVE  ANY  INFORMATION  OR  TO  MAKE  ANY
REPRESENTATIONS  NOT CONTAINED IN THIS PROSPECTUS OR IN THE FUND'S  STATEMENT OF
ADDITIONAL INFORMATION  INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE
OFFERING MADE BY THIS  PROSPECTUS  AND, IF GIVEN OR MADE,  SUCH  INFORMATION  OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE FUND OR
ITS DISTRIBUTOR.  THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY THE FUND OR
BY THE  DISTRIBUTOR IN ANY  JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY
BE MADE.

                                ----------------
                                    CONTENTS

                                                                           PAGE
INTRODUCTION ............................................................    2
FINANCIAL HIGHLIGHTS ....................................................    4
INVESTMENT OBJECTIVES AND POLICIES ......................................    7
Year 2000 ...............................................................   11
INVESTMENT LIMITATIONS ..................................................   11
PURCHASE AND REDEMPTION OF SHARES .......................................   12
NET ASSET VALUE .........................................................   17
MANAGEMENT ..............................................................   17
DISTRIBUTION OF SHARES ..................................................   19
DIVIDENDS AND DISTRIBUTIONS .............................................   20
TAXES ...................................................................   20
DESCRIPTION OF SHARES ...................................................   20
OTHER INFORMATION .......................................................   21
                                                                         
INVESTMENT ADVISER
BlackRock Institutional Management Corporation
Wilmington, Delaware

DISTRIBUTOR
Provident Distributors, Inc.
West Conshohocken, Pennsylvania

CUSTODIAN
PFPC Trust Company
Wilmington, Delaware

ADMINISTRATOR AND TRANSFER AGENT
PFPC Inc.
Wilmington, Delaware

COUNSEL
Drinker Biddle & Reath LLP
Philadelphia, Pennsylvania

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers LLP
Philadelphia, Pennsylvania

================================================================================

<PAGE>
================================================================================
                         JANNEY MONTGOMERY SCOTT (LOGO)
                               [GRAPHIC OMITTED]

PROSPECTUS
THE JANNEY 
MONTGOMERY SCOTT 
MONEY FUNDS

MONEY MARKET PORTFOLIO
- --------------------------------------------------------------------------------
MUNICIPAL
MONEY MARKET PORTFOLIO
- --------------------------------------------------------------------------------
GOVERNMENT OBLIGATIONS
MONEY MARKET PORTFOLIO
- --------------------------------------------------------------------------------
NEW YORK MUNICIPAL
MONEY MARKET PORTFOLIO
- --------------------------------------------------------------------------------

DECEMBER 29, 1998
================================================================================

<PAGE>

                     THE JANNEY MONTGOMERY SCOTT MONEY FUNDS
                              OF THE RBB FUND, INC.

     The Janney  Montgomery Scott Money Funds consists of four classes of common
stock  (collectively,  the "Janney Classes") of The RBB Fund, Inc. (the "Fund"),
an open-end  management  investment  company  incorporated under the laws of the
State of Maryland on February  29,  1988.  The Fund is  currently  operating  or
proposing to operate seventeen separate investment portfolios. The shares of the
classes  (collectively,  the  "Janney  Shares"  or  "Shares")  offered  by  this
Prospectus represent interests in a taxable money market portfolio,  a municipal
money market portfolio,  a U.S.  Government  obligations money market portfolio,
and  a  New  York   municipal   money  market   portfolio   (collectively,   the
"Portfolios").  The investment objectives of each investment portfolio described
in this Prospectus are as follows:

         MONEY  MARKET  PORTFOLIO  -- to  provide  as  high a level  of  current
     interest income as is consistent with  maintaining  liquidity and stability
     of  principal.  It  seeks to  achieve  such  objective  by  investing  in a
     diversified portfolio of U.S. dollar-denominated money market instruments.

         MUNICIPAL  MONEY  MARKET  PORTFOLIO  -- to  provide  as high a level of
     current  interest  income exempt from federal income taxes as is consistent
     with maintaining liquidity and stability of principal.  It seeks to achieve
     such  objective  by  investing   substantially  all  of  its  assets  in  a
     diversified  portfolio  of  short-term  Municipal  Obligations.  "Municipal
     Obligations" are obligations issued by or on behalf of states,  territories
     and  possessions of the United  States,  the District of Columbia and their
     political subdivisions, agencies, instrumentalities and authorities. During
     periods of normal market conditions,  at least 80% of the net assets of the
     Portfolio will be invested in Municipal Obligations,  the interest on which
     is exempt from the regular  federal  income tax but which may constitute an
     item of tax preference for purposes of the federal alternative minimum tax.

         GOVERNMENT  OBLIGATIONS  MONEY MARKET PORTFOLIO -- to provide as high a
     level  of  current  interest  income  as  is  consistent  with  maintaining
     liquidity and stability of principal. It seeks to achieve such objective by
     investing in short-term U.S.  Treasury bills,  notes and other  obligations
     issued  or   guaranteed   by  the  U.S.   Government  or  its  agencies  or
     instrumentalities, and repurchase agreements relating to such obligations.

         NEW YORK MUNICIPAL MONEY MARKET PORTFOLIO -- to provide as high a level
     of current income that is exempt from federal,  New York State and New York
     City personal  income taxes as is consistent  with  preservation of capital
     and liquidity.  It seeks to achieve its objective by investing primarily in
     Municipal  Obligations,  the  interest  on which is exempt from the regular
     federal income tax and is not an item of tax preference for purposes of the
     federal alternative minimum tax ("Tax-Exempt  Interest") and is exempt from
     New York  State  and New York City  personal  income  taxes and which  meet
     certain  ratings  criteria and present  minimal credit risks.  The New York
     Municipal Money Market Portfolio may invest a significant percentage of its
     assets in a single issuer,  and therefore  investment in this Portfolio may
     be riskier than an investment in other types of money market funds.

     SHARES OF THE FUND ARE NOT  DEPOSITS OR  OBLIGATIONS  OF OR  GUARANTEED  OR
ENDORSED BY PNC BANK, NATIONAL ASSOCIATION, PFPC TRUST COMPANY OR ANY OTHER BANK
AND  SHARES  ARE  NOT  FEDERALLY   INSURED  BY  THE  FEDERAL  DEPOSIT  INSURANCE
CORPORATION,  THE FEDERAL  RESERVE  BOARD,  OR ANY OTHER  AGENCY. INVESTMENTS IN
SHARES OF THE FUND INVOLVE  INVESTMENT  RISKS,  INCLUDING  THE POSSIBLE  LOSS OF
PRINCIPAL.  THERE  CAN BE NO  ASSURANCE  THAT  THE  PORTFOLIOS  WILL  BE ABLE TO
MAINTAIN A STABLE NET ASSET VALUE OF $1.00 PER SHARE.

     An investor  may purchase  and redeem  Shares of any of the Janney  Classes
through  Janney  Montgomery  Scott  ("JMS").  See  "Purchase  and  Redemption of
Shares."

     BlackRock   Institutional   Management   Corporation   ("BIMC")  serves  as
investment adviser for the Portfolios and PFPC Trust Company serves as custodian
for the Fund.  PFPC Inc.  ("PFPC")  serves as  administrator  and  transfer  and
dividend  disbursing  agent  for the Fund.  Provident  Distributors,  Inc.  (the
"Distributor") acts as distributor for the Fund

     This Prospectus  contains concise  information that a prospective  investor
needs to know before investing. Please keep it for future reference. A Statement
of  Additional  Information,  dated  December 29, 1998,  has been filed with the
Securities  and Exchange  Commission  and is  incorporated  by reference in this
Prospectus.  It may be  obtained  upon  request  free of charge from the Fund by
calling  (800)430-9618.  The Prospectus and Statement of Additional  Information
are also available for reference, along with other related materials, on the SEC
Internet Website (http://www.sec.gov).
- --------------------------------------------------------------------------------
THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THIS
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------

PROSPECTUS                                                     December 29, 1998

<PAGE>

FEE TABLE

ANNUAL FUND OPERATING EXPENSES (JANNEY SHARES)

     The Fee Table below contains a summary of the annual operating  expenses of
the Janney Classes of the Portfolios  based on expenses  incurred for the fiscal
year ended August 31,  1998,  as a percentage  of average  daily net assets.  An
example based on the summary is also shown.

<TABLE>
<CAPTION>
                                                                                  GOVERNMENT        NEW YORK
                                                                 MUNICIPAL        OBLIGATIONS       MUNICIPAL
                                              MONEY MARKET     MONEY MARKET      MONEY MARKET     MONEY MARKET
                                                PORTFOLIO        PORTFOLIO         PORTFOLIO        PORTFOLIO
                                              ------------     ------------      ------------     ------------
<S>                                               <C>              <C>               <C>              <C> 
Management Fees (after waivers)(1) .........       .24%             .08%              .30%             .05%
12b-1 Fees(1) ..............................       .60              .58               .57              .56
Other Expenses (after waivers)(1) ..........       .16              .20               .13              .19
                                                  ----             ----              ----             ----
Total Fund Operating Expenses
   (Janney Classes) (after waivers
   and reimbursements)(1) ..................      1.00%             .86%             1.00%             .80%
                                                  ====             ====              ====              ===

<FN>
(1) Management Fees and 12b-1 Fees are based on average daily net assets and are
    calculated  daily and paid  monthly.  Before  waivers  for the Money  Market
    Portfolio,  Municipal Money Market Portfolio,  Government  Obligations Money
    Market Portfolio and New York Municipal Money Market  Portfolio,  Management
    Fees would be .36%, .34%, .44%, and .35%, respectively; Other Expenses would
    be .25%,  .24%,  .22%,  and .29%,  respectively;  and Total  Fund  Operating
    Expenses would be 1.21%, 1.16%, 1.23%, and 1.20%, respectively.
</FN>
</TABLE>

EXAMPLE

     An  investor  would  pay the  following  expenses  on a $1,000  investment,
assuming (1) 5% annual return and (2) redemption at the end of each time period:

<TABLE>
<CAPTION>
                                                  1 YEAR            3 YEARS          5 YEARS          10 YEARS
                                                  ------            -------          -------          --------
<S>                                                 <C>               <C>              <C>              <C> 
Money Market* ..................................    $10               $32              $55              $122
Municipal Money Market* ........................    $ 9               $27              $48              $106
Government Obligations Money Market* ...........    $10               $32              $55              $122
New York Municipal Money Market* ...............    $ 8               $26              $44               $99
                                                                  
<FN>
 * Other classes of these Portfolios are sold with different fees and expenses.
</FN>
</TABLE>

     The Example in the Fee Table assumes that all  dividends and  distributions
are reinvested and that the amounts listed under "Annual Fund Operating Expenses
(Janney  Classes)" remain the same in the years shown. THE EXAMPLE SHOULD NOT BE
CONSIDERED A  REPRESENTATION  OF PAST OR FUTURE EXPENSES AND ACTUAL EXPENSES MAY
BE GREATER OR LESS THAN THOSE SHOWN.  Long-term  shareholders  may pay more than
the economic  equivalent of the maximum front-end sales charges permitted by the
National Association of Securities Dealers, Inc.

     The Fee Table is  designed  to  assist an  investor  in  understanding  the
various  costs and expenses  that an investor in the Janney  Classes of the Fund
will bear directly or indirectly. (For more complete descriptions of the various
costs and expenses,  see  "Management--Investment  Adviser" and "Distribution of
Shares"  below.)  Expense  figures are based on actual costs and fees charged to
each class.  The Fee Table  reflects a voluntary  waiver of Management  Fees for
each  Portfolio.  However,  there can be no assurance that any future waivers of
Management Fees will not vary from

                                        2

<PAGE>

the figures reflected in the Fee Table. To the extent that any service providers
assume  additional  expenses of the  Portfolios,  such  assumption will have the
effect of lowering a Portfolio's  overall expense ratio and increasing its yield
to investors.

     From time to time a Portfolio  advertises its "total  return,"  "yield" and
"effective  yield."  Total  return  and yield  figures  are based on  historical
earnings and are not intended to indicate future  performance.  The "yield" of a
Portfolio  refers to the income generated by an investment in a Portfolio over a
seven-day period (which period will be stated in the advertisement). This income
is then  "annualized." That is, the amount of income generated by the investment
during that week is assumed to be generated  each week over a 52-week period and
is shown as a percentage of the investment.  The "effective yield" is calculated
similarly  but,  when  annualized,  the  income  earned  by an  investment  in a
Portfolio is assumed to be reinvested.  The  "effective  yield" will be slightly
higher  than the  "yield"  because  of the  compounding  effect of this  assumed
reinvestment.  Each of the Municipal  Money Market  Portfolio's and the New York
Municipal  Money Market  Portfolio's  "tax-equivalent  yield" may also be quoted
from time to time,  which shows the level of taxable  yield needed to produce an
after-tax  equivalent  to  such  Portfolio's  tax-free  yield.  This  is done by
increasing the Municipal Money Market Portfolio's yield (calculated as above) by
the amount  necessary  to reflect the payment of federal  income tax at a stated
tax rate and by increasing the New York Municipal Money Market Portfolio's yield
(calculated as above) by the amount necessary to reflect the payment of federal,
New York State and New York City personal income taxes at stated rates.

     The total  return and yield of any  investment  is  generally a function of
portfolio quality and maturity,  type of investment and operating expenses.  The
total return and yield on Shares of any of the Janney Classes will fluctuate and
is not necessarily  representative  of future  results.  Any fees charged by JMS
directly to their customers in connection with investments in the Janney Classes
are not reflected in the total return and yields of the Janney Shares,  and such
fees, if charged,  will reduce the actual  return  received by  shareholders  on
their  investments.  The total return and yield on Shares of the Janney  Classes
may differ from total  return and yields on shares of other  classes of the Fund
that also represent  interests in the same Portfolio depending on the allocation
of expenses to each of the classes of that Portfolio. See "Expenses."

FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
     The table below sets forth certain  information  concerning  the investment
results  of the  Janney  Classes  representing  interests  in the Money  Market,
Municipal  Money  Market,  Government  Obligations  Money  Market  and New  York
Municipal Money Market Portfolios for the periods indicated.  The financial data
included in this table for each of the  periods  ended  August 31, 1995  through
1998 are part of the Fund's  financial  statements  for each of the  Portfolios,
which are incorporated by reference into the Statement of Additional Information
and have been audited by PricewaterhouseCoopers LLP  ("PricewaterhouseCoopers"),
the  Fund's  independent  accountants.  The  financial  data  should  be read in
conjunction   with  such  financial   statements  and  notes  thereto.   Further
information  about the  performance of the Portfolios is available in the Annual
Report to Shareholders. Both the Annual Report to Shareholders and the Statement
of  Additional  Information  may be  obtained  free of  charge  by  calling  the
telephone number on page 1 of this Prospectus.

                                        3

<PAGE>

                     THE JANNEY MONTGOMERY SCOTT MONEY FUNDS
                               THE RBB FUND, INC.

                             MONEY MARKET PORTFOLIO


FINANCIAL HIGHLIGHTS (c)
     (FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

<TABLE>
<CAPTION>
                                                                                                           FOR THE PERIOD
                                                                                                           JUNE 12, 1995
                                                            FOR THE         FOR THE         FOR THE       (COMMENCEMENT OF
                                                          YEAR ENDED      YEAR ENDED       YEAR ENDED      OPERATIONS) TO
                                                       AUGUST 31, 1998  AUGUST 31, 1997  AUGUST 31, 1996   AUGUST 31, 1995
                                                       ---------------  ---------------  ---------------  ----------------
<S>                                                        <C>             <C>               <C>               <C>     
Net asset value, beginning of period ................      $   1.00        $   1.00          $   1.00          $   1.00
                                                           --------        --------          --------          --------
Income from investment operations:
   Net investment income ............................        0.0469          0.0459            0.0465            0.0112
                                                           --------        --------          --------          --------
     Total from investment operations ...............        0.0469          0.0459            0.0465            0.0112
                                                           --------        --------          --------          --------
Less distributions
   Dividends (from net investment income) ...........       (0.0469)        (0.0459)          (0.0465)          (0.0112)
                                                           --------        --------          --------          --------
     Total distributions ............................       (0.0469)        (0.0459)          (0.0465)          (0.0112)
                                                           --------        --------          --------          --------
Net asset value, end of period ......................      $   1.00        $   1.00          $   1.00          $   1.00
                                                           ========        ========          ========          ========
Total Return ........................................         4.81%           4.69%             4.76%           5.30%(b)
Ratios/Supplemental Data
   Net assets, end of period (000) ..................      $904,526        $736,855          $561,865          $443,645
   Ratios of expenses to average net assets .........       1.00%(a)        1.00%(a)          1.00%(a)          1.00%(a)(b)
   Ratios of net investment income to
     average net assets .............................         4.69%           4.59%             4.65%           5.04%(b)

<FN>
(a) Without the waiver of advisory,  administration  and transfer agent fees and
    without  the  reimbursement  of certain  operating  expenses,  the ratios of
    expenses to average  net assets for the Money  Market  Portfolio  would have
    been 1.21%,  1.22%,  1.23%,  and 1.23% for the years ended  August 31, 1998,
    1997 and 1996 and the period ended August 31, 1995, respectively.

(b) Annualized.

(c) Financial  Highlights relate solely to the Janney Class of shares within the
    Money Market Portfolio.
</FN>
</TABLE>
                                        4

<PAGE>

                     THE JANNEY MONTGOMERY SCOTT MONEY FUNDS
                               THE RBB FUND, INC.

                        MUNICIPAL MONEY MARKET PORTFOLIO

FINANCIAL HIGHLIGHTS (c)
     (FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

<TABLE>
<CAPTION>
                                                                                                           FOR THE PERIOD
                                                                                                           JUNE 12, 1995
                                                            FOR THE         FOR THE         FOR THE       (COMMENCEMENT OF
                                                          YEAR ENDED      YEAR ENDED       YEAR ENDED      OPERATIONS) TO
                                                       AUGUST 31, 1998  AUGUST 31, 1997  AUGUST 31, 1996   AUGUST 31, 1995
                                                       ---------------  ---------------  ---------------  ----------------
<S>                                                        <C>             <C>               <C>               <C>     
Net asset value, beginning of period ................       $  1.00         $   1.00          $  1.00          $   1.00
                                                            -------         --------          -------          --------
Income from investment operations:
   Net investment income ............................        0.0290           0.0285           0.0278            0.0063
                                                            -------         --------          -------          --------
     Total from investment operations ...............        0.0290           0.0285           0.0278            0.0063
                                                            -------         --------          -------          --------
Less distributions
   Dividends (from net investment income) ...........       (0.0290)         (0.0285)         (0.0278)          (0.0063)
                                                            -------         --------          -------          --------
     Total distributions ............................       (0.0290)         (0.0285)         (0.0278)          (0.0063)
                                                            -------         --------          -------          --------
Net asset value, end of period ......................       $  1.00         $   1.00          $  1.00          $   1.00
                                                            =======         ========          =======          ========
Total return ........................................         2.94%            2.89%            2.81%           2.87%(b)
Ratios/Supplemental Data
   Net assets, end of period (000) ..................       $97,445         $108,826          $89,428          $113,256
   Ratios of expenses to average net assets .........       0.86%(a)         0.85%(a)         0.94%(a)          1.00%(a)(b)
   Ratios of net investment income to
     average net assets .............................         2.90%            2.85%            2.78%           2.83%(b)

<FN>
(a) Without the waiver of advisory,  administration  and transfer agent fees and
    without  the  reimbursement  of certain  operating  expenses,  the ratios of
    expenses  to average net assets for the  Municipal  Money  Market  Portfolio
    would have been 1.16%,  1.13%,  1.23%, and 1.30%, for the years ended August
    31, 1998, 1997 and 1996 and the period ended August 31, 1995, respectively.

(b) Annualized.

(c) Financial  Highlights relate solely to the Janney Class of shares within the
    Municipal Money Market Portfolio.
</FN>
</TABLE>

                                        5

<PAGE>



                     THE JANNEY MONTGOMERY SCOTT MONEY FUNDS
                               THE RBB FUND, INC.

                  GOVERNMENT OBLIGATIONS MONEY MARKET PORTFOLIO


FINANCIAL HIGHLIGHTS (c)
     (FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

<TABLE>
<CAPTION>
                                                                                                           FOR THE PERIOD
                                                                                                           JUNE 12, 1995
                                                            FOR THE         FOR THE         FOR THE       (COMMENCEMENT OF
                                                          YEAR ENDED      YEAR ENDED       YEAR ENDED      OPERATIONS) TO
                                                       AUGUST 31, 1998  AUGUST 31, 1997  AUGUST 31, 1996   AUGUST 31, 1995
                                                       ---------------  ---------------  ---------------  ----------------
<S>                                                        <C>              <C>               <C>              <C>     
Net asset value, beginning of period ................      $   1.00         $   1.00          $   1.00         $   1.00
                                                           --------         --------          --------         --------
Income from investment operations:
   Net investment income ............................        0.0460           0.0447            0.0456           0.0109
                                                           --------         --------          --------         --------
     Total from investment operations ...............        0.0460           0.0447            0.0456           0.0109
                                                           --------         --------          --------         --------
Less distributions
   Dividends (from net investment income) ...........       (0.0460)         (0.0447)          (0.0456)         (0.0109)
                                                           --------         --------          --------         --------
     Total distributions ............................       (0.0460)         (0.0447)          (0.0456)         (0.0109)
                                                           --------         --------          --------         --------
Net asset value, end of period ......................      $   1.00         $   1.00          $   1.00         $   1.00
                                                           ========         ========          ========         ========
Total return ........................................         4.71%            4.56%             4.66%          5.03%(b)
Ratios/Supplemental Data
   Net assets, end of period (000) ..................      $379,065         $352,950          $306,757         $302,585
   Ratios of expenses to average net assets .........       1.00%(a)         1.00%(a)          1.00%(a)         1.00%(a)(b)
   Ratios of net investment income to
     average net assets .............................         4.60%            4.47%             4.56%          4.91%(b)

<FN>
(a) Without the waiver of advisory,  administration  and transfer agent fees and
    without  the  reimbursement  of certain  operating  expenses,  the ratios of
    expenses to average net assets for the Government  Obligations  Money Market
    Portfolio  would have been 1.23%,  1.23%,  1.25%,  and 1.28%,  for the years
    ended August 31,  1998,  1997 and 1996 and the period ended August 31, 1995,
    respectively.

(b) Annualized.

(c) Financial  Highlights relate solely to the Janney Class of shares within the
    Government Obligations Money Market Portfolio.
</FN>
</TABLE>

                                        6

<PAGE>

                     THE JANNEY MONTGOMERY SCOTT MONEY FUNDS
                               THE RBB FUND, INC.

                    NEW YORK MUNICIPAL MONEY MARKET PORTFOLIO


FINANCIAL HIGHLIGHTS (c)
     (FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

<TABLE>
<CAPTION>
                                                                                                           FOR THE PERIOD
                                                                                                           JUNE 12, 1995
                                                            FOR THE         FOR THE         FOR THE       (COMMENCEMENT OF
                                                          YEAR ENDED      YEAR ENDED       YEAR ENDED      OPERATIONS) TO
                                                       AUGUST 31, 1998  AUGUST 31, 1997  AUGUST 31, 1996   AUGUST 31, 1995
                                                       ---------------  ---------------  ---------------  ----------------
<S>                                                         <C>              <C>              <C>               <C>     
Net asset value, beginning of period ................       $  1.00          $  1.00          $  1.00           $  1.00
                                                            -------          -------          -------           -------
Income from investment operations:
   Net investment income ............................        0.0273           0.0276           0.0262            0.0062
                                                            -------          -------          -------           -------
     Total from investment operations ...............        0.0273           0.0276           0.0262            0.0062
                                                            -------          -------          -------           -------
Less distributions
   Dividends (from net investment income) ...........       (0.0273)         (0.0276)         (0.0262)          (0.0062)
                                                            -------          -------          -------           -------
     Total distributions ............................       (0.0273)         (0.0276)         (0.0262)          (0.0062)
                                                            -------          -------          -------           -------
Net asset value, end of period ......................       $  1.00          $  1.00          $  1.00           $  1.00
                                                            =======          =======          =======           =======
Total return ........................................         2.77%            2.80%            2.65%           2.72%(b)
Ratios/Supplemental Data
   Net assets, end of period (000) ..................       $31,055          $30,442          $20,032           $14,671
   Ratios of expenses to average net assets .........        .80%(a)          .80%(a)          .93%(a)          1.00%(a)(b)
   Ratios of net investment income to
     average net assets .............................         2.73%            2.76%            2.62%           2.68%(b)

<FN>
(a) Without the waiver of advisory,  administration  and transfer agent fees and
    without  the  reimbursement  of certain  operating  expenses,  the ratios of
    expenses  to  average  net assets for the New York  Municipal  Money  Market
    Portfolio  would have been 1.20%,  1.13%,  1.25%,  and 1.28%,  for the years
    ended August 31,  1998,  1997 and 1996 and the period ended August 31, 1995,
    respectively.

(b) Annualized.

(c) Financial  Highlights relate solely to the Janney Class of shares within the
    New York Municipal Money Market Portfolio.
</FN>
</TABLE>

                                        7

<PAGE>

INVESTMENT OBJECTIVES AND POLICIES
- --------------------------------------------------------------------------------

                             MONEY MARKET PORTFOLIO

     The Money Market Portfolio's  investment  objective is to provide as high a
level of current interest income as is consistent with maintaining liquidity and
stability of principal. Portfolio obligations held by the Money Market Portfolio
have remaining  maturities of 397 days or less (exclusive of securities  subject
to  repurchase  agreements).  In pursuing its  investment  objective,  the Money
Market Portfolio invests in a diversified  portfolio of U.S.  dollar-denominated
instruments,  such as government,  bank and commercial obligations,  that may be
available  in the  money  markets  ("Money  Market  Instruments")  and that meet
certain  ratings  criteria and present  minimal credit risks to the Money Market
Portfolio.  See "Eligible  Securities." There is no assurance that the Portfolio
will achieve its investment objective. The following descriptions illustrate the
types of Money Market Instruments in which the Money Market Portfolio invests.

     BANK OBLIGATIONS.  The Portfolio may purchase obligations of issuers in the
banking  industry  such as  short-term  obligations  of bank holding  companies,
certificates of deposit, bankers' acceptances and time deposits,  including U.S.
dollar-denominated  instruments  issued or  supported  by the credit of U.S.  or
foreign  banks  or  savings  institutions  having  total  assets  at the time of
purchase in excess of $1 billion.  The  Portfolio  may invest  substantially  in
obligations  of  foreign  banks or  foreign  branches  of U.S.  banks  where the
investment  adviser deems the instrument to present  minimal credit risks.  Such
investments  may  nevertheless  entail  risks in  addition  to those of domestic
issuers,   including  higher   transaction   costs,   less  complete   financial
information,  less stringent regulatory  requirements and less market liquidity.
The Portfolio may also make interest-bearing  savings deposits in commercial and
savings banks in amounts not in excess of 5% of its total assets.

     COMMERCIAL PAPER. The Portfolio may purchase commercial paper (i) rated (at
the time of  purchase)  in the two  highest  rating  categories  of at least two
nationally recognized statistical rating organizations  ("Rating  Organization")
or, by the only Rating  Organization;  or (ii) issued by issuers (or, in certain
cases  guaranteed by persons) with  short-term  debt having such ratings.  These
rating  categories  are described in the Appendix to the Statement of Additional
Information.  The Portfolio may also purchase unrated  commercial paper provided
that such paper is  determined to be of  comparable  quality by the  Portfolio's
investment adviser in accordance with guidelines approved by the Fund's Board of
Directors.

     Commercial paper purchased by the Portfolio may include  instruments issued
by foreign issuers,  such as Canadian  Commercial  Paper ("CCP"),  which is U.S.
dollar-denominated  commercial  paper  issued  by a  Canadian  corporation  or a
Canadian  counterpart  of a U.S.  corporation,  and in Europaper,  which is U.S.
dollar-denominated commercial paper of a foreign issuer, subject to the criteria
stated above for other commercial paper issuers.

     VARIABLE RATE DEMAND NOTES. The Portfolio may purchase variable rate demand
notes, which are unsecured  instruments that permit the indebtedness  thereunder
to vary and provide for periodic  adjustment in the interest rate.  Although the
notes are not normally traded and there may be no active secondary market in the
notes,  the Portfolio will be able (at any time or during the specified  periods
not exceeding 13 months,  depending upon the note involved) to demand payment of
the  principal of a note.  The notes are not  typically  rated by credit  rating
agencies,  but  issuers of  variable  rate  demand  notes must  satisfy the same
criteria as set forth above for issuers of commercial  paper.  If an issuer of a
variable  rate demand note  defaulted on its payment  obligation,  the Portfolio
might be unable to  dispose  of the note  because  of the  absence  of an active
secondary market.  For this or other reasons,  the Portfolio might suffer a loss
to the extent of the  default.  The  Portfolio  invests in variable  rate demand
notes only when the  Portfolio's  investment  adviser  deems the  investment  to
involve  minimal credit risk. The Portfolio's  investment  adviser also monitors
the continuing  creditworthiness  of issuers of such notes to determine  whether
the Portfolio should continue to hold such notes.

                                        8

<PAGE>

     REPURCHASE AGREEMENTS.  The Portfolio may agree to purchase securities from
financial  institutions  subject to the seller's agreement to repurchase them at
an agreed upon time and price  ("repurchase  agreements").  The securities  held
subject to a  repurchase  agreement  may have  stated  maturities  exceeding  13
months, provided the repurchase agreement itself matures in less than 13 months.
Default by or bankruptcy of the seller would,  however,  expose the Portfolio to
possible loss because of adverse market action or delays in connection  with the
disposition of the underlying obligations.

     U.S. GOVERNMENT OBLIGATIONS.  The Portfolio may purchase obligations issued
or  guaranteed  by the U.S.  Government  or its agencies and  instrumentalities.
Obligations of certain agencies and instrumentalities of the U.S. Government are
backed by the full faith and credit of the United  States.  Others are backed by
the right of the issuer to borrow  from the U.S.  Treasury or are backed only by
the credit of the agency or instrumentality issuing the obligation.

     ASSET-BACKED   SECURITIES.   The  Portfolio  may  invest  in   asset-backed
securities which are backed by mortgages,  installment  sales contracts,  credit
card  receivables  or  other  assets  and  collateralized  mortgage  obligations
("CMOs") issued or guaranteed by U.S. Government agencies and, instrumentalities
or issued by private companies.  Asset-backed securities also include adjustable
rate securities.  The estimated life of an asset-backed security varies with the
prepayment experience with respect to the underlying debt instruments.  For this
and other reasons, an asset-backed  security's stated maturity may be shortened,
and the  security's  total return may be difficult  to predict  precisely.  Such
difficulties  are not expected,  however,  to have a  significant  effect on the
Portfolio since the remaining  maturity of any  asset-backed  security  acquired
will be 13 months or less.  Asset-backed  securities  are considered an industry
for industry concentration purposes. See "Investment Limitations." In periods of
falling  interest  rates,  the rate of mortgage  prepayments  tends to increase.
During these periods, the reinvestment of proceeds by a Portfolio will generally
be at lower rates than the rates on the prepaid obligations.

     REVERSE  REPURCHASE  AGREEMENTS.  The  Portfolio  may  enter  into  reverse
repurchase agreements with respect to portfolio securities. A reverse repurchase
agreement   involves  a  sale  by  a  Portfolio  of  securities  that  it  holds
concurrently  with an agreement by the Portfolio to repurchase them at an agreed
upon time and price.  Reverse  repurchase  agreements  involve the risk that the
market value of the securities sold by the Portfolio may decline below the price
at which the  Portfolio is  obligated to  repurchase  them.  Reverse  repurchase
agreements are considered to be borrowings by the Portfolio under the Investment
Company Act of 1940 (the "1940 Act").

     GUARANTEED  INVESTMENT  CONTRACTS.  The Portfolio may make  investments  in
obligations,  such  as  guaranteed  investment  contracts  and  similar  funding
agreements  (collectively,  "GICs"),  issued  by  highly  rated  U.S.  insurance
companies.  A GIC is a general  obligation of the issuing  insurance company and
not a separate account. The Portfolio's  investments in GICs are not expected to
exceed 5% of its total  assets at the time of  purchase  absent  unusual  market
conditions.   GIC  investments  are  subject  to  the  Fund's  policy  regarding
investment in illiquid securities.

     MUNICIPAL  OBLIGATIONS.   In  addition,  the  Portfolio  may,  when  deemed
appropriate by its  investment  adviser in light of the  Portfolio's  investment
objective,  invest  without  limitation  in high quality,  short-term  Municipal
Obligations  issued by state and local  governmental  issuers,  the  interest on
which may be taxable or tax-exempt  for federal  income tax  purposes,  provided
that such  obligations  carry  yields that are  competitive  with those of other
types of Money Market  Instruments  of comparable  quality.  For a more complete
discussion   of  Municipal   Obligations,   see   "Investment   Objectives   and
Policies--Municipal Money Market Portfolio--Municipal Obligations."

     STAND-BY COMMITMENTS. The Portfolio may acquire "stand-by commitments" with
respect  to  Municipal  Obligations  held in its  portfolio.  Under  a  stand-by
commitment, a dealer would agree to purchase at the Portfolio's option specified
Municipal  Obligations  at a  specified  price.  The  acquisition  of a stand-by
commitment may increase the cost, and thereby reduce the yield, of the Municipal
Obligation to which such commitment relates. The Portfolio will acquire stand-by
commitments  solely to  facilitate  portfolio  liquidity  and does not intend to
exercise its rights thereunder for trading purposes.

                                        9

<PAGE>

     WHEN-ISSUED SECURITIES.  The Portfolio may purchase portfolio securities on
a  "when-issued"  basis.  When issued  securities are  securities  purchased for
delivery  beyond the normal  settlement  date at a stated  price and yield.  The
Portfolio will generally not pay for such  securities or start earning  interest
on them until they are received. Securities purchased on a when-issued basis are
recorded as an asset at the time the  commitment is entered into and are subject
to changes in value prior to delivery based upon changes in the general level of
interest rates. The Portfolio  expects that commitments to purchase  when-issued
securities  will not exceed 25% of the value of its total assets absent  unusual
market  conditions.  The  Portfolio  does not  intend  to  purchase  when-issued
securities  for  speculative  purposes but only in furtherance of its investment
objective.

     ELIGIBLE SECURITIES. The Portfolio will only purchase "eligible securities"
that present  minimal credit risks as determined by the  Portfolio's  investment
adviser  pursuant  to  guidelines  adopted by the Board of  Directors.  Eligible
securities  generally include:  (1) U.S. Government  securities,  (2) securities
that are rated at the time of purchase in the two highest  rating  categories by
at least two Rating Organizations  ("Rating  Organizations")  (e.g.,  commercial
paper rated "A-1" or "A-2" by Standard & Poor's Ratings  Services  ("S&P"),  (3)
securities  that  are  rated  at  the  time  of  purchase  by  the  only  Rating
Organization rating the security in one of its two highest rating categories for
such  securities,  (4)  securities  issued by  issuers  (or,  in  certain  cases
guaranteed  by  persons)  with  short-term  debt having  such  ratings,  and (5)
securities  that are not  rated and are  issued by an issuer  that does not have
comparable  obligations rated by a Rating Organization  ("Unrated  Securities"),
provided that such  securities  are  determined  to be of comparable  quality to
eligible  rated  securities.   For  a  more  complete  description  of  eligible
securities,  see  "Investment  Objectives  and  Policies"  in the  Statement  of
Additional Information.

     ILLIQUID SECURITIES. The Portfolio will not invest more than 10% of its net
assets in illiquid  securities,  including  repurchase  agreements  which have a
maturity of longer than seven days,  time deposits with  maturities in excess of
seven days,  variable  rate demand notes with demand  periods in excess of seven
days unless the Portfolio's  investment  adviser  determines that such notes are
readily  marketable  and could be sold  promptly at the prices at which they are
valued, GICs, and other securities that are illiquid by virtue of the absence of
a readily  available  market or legal or  contractual  restrictions  on  resale.
Repurchase  agreements  subject to demand are deemed to have a maturity equal to
the notice period.  Securities  that have legal or contractual  restrictions  on
resale but have a readily  available market are not deemed illiquid for purposes
of  this  limitation.  The  Portfolio's  investment  adviser  will  monitor  the
liquidity of such  restricted  securities  under the supervision of the Board of
Directors. See "Investment Objectives and Policies--Illiquid  Securities" in the
Statement of Additional Information.

                        MUNICIPAL MONEY MARKET PORTFOLIO

     The Municipal Money Market Portfolio's  investment  objective is to provide
as high a level of current  interest  income exempt from federal income taxes as
is  consistent  with  maintaining  liquidity  and  stability of  principal.  The
Municipal Money Market Portfolio  invests  substantially  all of its assets in a
diversified  portfolio  of  short-term  Municipal  Obligations,  the interest on
which, in the opinion of bond counsel or counsel to the issuer,  as the case may
be, is exempt from the regular  federal  income  tax.  During  periods of normal
market conditions,  at least 80% of the net assets of the Municipal Money Market
Portfolio  will be  invested in  Municipal  Obligations.  Municipal  Obligations
include securities,  the interest on which is Tax-Exempt  Interest,  although to
the extent the Portfolio  invests in certain private activity bonds issued after
August 7, 1986 ("Alternative Minimum Tax Securities"), a portion of the interest
earned by the Portfolio may constitute an item of tax preference for purposes of
the federal alternative minimum tax ("AMT Interest"). There is no assurance that
the investment objective of the Portfolio will be achieved.

                                       10

<PAGE>

     MUNICIPAL  OBLIGATIONS.  The  Portfolio  invests  in  short-term  Municipal
Obligations  which are  determined  by the  Portfolio's  investment  adviser  to
present minimal credit risks and that meet certain ratings criteria  pursuant to
guidelines established by the Fund's Board of Directors.  The Portfolio may also
purchase Unrated  Securities  provided that such securities are determined to be
of comparable  quality to eligible rated  securities.  The applicable  Municipal
Obligations ratings are described in the Appendix to the Statement of Additional
Information.

     The Portfolio may hold uninvested cash reserves pending  investment  during
temporary defensive periods, or if, in the opinion of the Portfolio's investment
adviser,  suitable  obligations  bearing Tax-Exempt Interest or AMT Interest are
unavailable. There is no percentage limitation on the amount of assets which may
be held uninvested during temporary defensive periods.  Uninvested cash reserves
will not earn income.

     The two principal  classifications  of Municipal  Obligations  are "general
obligation"  securities and "revenue" securities.  General obligation securities
are secured by the  issuer's  pledge of its full faith,  credit and taxing power
for the payment of principal and interest.  Revenue  securities are payable only
from the revenues derived from a particular  facility or class of facilities or,
in some  cases,  from the  proceeds  of a special  excise tax or other  specific
excise tax or other  specific  revenue  source such as the user of the  facility
being financed.  Revenue securities include private activity bonds which are not
payable from the unrestricted revenues of the issuer.  Consequently,  the credit
quality of private  activity  bonds is  usually  directly  related to the credit
standing of the corporate user of the facility involved.

     Municipal  Obligations may also include "moral obligation" bonds, which are
normally  issued by special purpose public  authorities.  If the issuer of moral
obligation  bonds is unable to meet its debt  service  obligations  from current
revenues,  it may draw on a reserve fund,  the  restoration  of which is a moral
commitment but not a legal obligation of the state or municipality which created
the issuer.

     Although the Municipal  Money Market  Portfolio may invest more than 25% of
its net assets in (i) Municipal Obligations whose issuers are in the same state,
(ii) Municipal Obligations the interest on which is paid solely from revenues of
similar projects,  and (iii) private activity bonds bearing Tax-Exempt Interest,
it does not  currently  intend to do so on a regular  basis.  To the  extent the
Municipal  Money  Market   Portfolio's  assets  are  concentrated  in  Municipal
Obligations that are payable from the revenues of similar projects or are issued
by  issuers  located in the same  state,  the  Portfolio  will be subject to the
peculiar risks  presented by the laws and economic  conditions  relating to such
states or projects  to a greater  extent than it would be if its assets were not
so concentrated.

     TAX-EXEMPT DERIVATIVE SECURITIES.  The Municipal Money Market Portfolio may
invest  in  tax-exempt  derivative  securities  such  as  tender  option  bonds,
custodial  receipts,   participations,   beneficial   interests  in  trusts  and
partnership  interests.  A typical tax-exempt  derivative  security involves the
purchase  of an  interest  in a pool of  Municipal  Obligations  which  interest
includes a tender  option,  demand or other  feature,  allowing the Portfolio to
tender  the  underlying  Municipal  Obligation  to a  third  party  at  periodic
intervals and to receive the principal amount thereof. In some cases,  Municipal
Obligations are represented by custodial  receipts  evidencing  rights to future
principal or interest payments, or both, on underlying municipal securities held
by a custodian  and such  receipts  include the option to tender the  underlying
securities  to the sponsor  (usually a bank,  broker-dealer  or other  financial
institution). Although the Internal Revenue Service has not ruled on whether the
interest  received  on  derivative  securities  in  the  form  of  participation
interests or custodial receipts is Tax-Exempt Interest, opinions relating to the
validity of, and the  tax-exempt  status of payments  received by, the Portfolio
from such  derivative  securities  are  rendered  by counsel  to the  respective
sponsors of such derivatives and relied upon by the Portfolio in purchasing such
securities.  Neither the  Portfolio nor its  investment  adviser will review the
proceedings relating to the creation of any tax-exempt  derivative securities or
the basis for such legal opinions.

     WHEN-ISSUED   SECURITIES.   The  Portfolio  may  also  purchase   portfolio
securities on a "when-issued"  basis as described under  "Investment  Objectives
and Policies--Money Market Portfolio--When-Issued Securities."

                                       11

<PAGE>

     STAND-BY COMMITMENTS. The Portfolio may acquire "stand-by commitments" with
respect to  Municipal  Obligations  held in its  portfolio  as  described  under
"Investment   Objectives   and   Policies--Money   Market    Portfolio--Stand-By
Commitments."

     ELIGIBLE  SECURITIES.  The  Municipal  Money  Market  Portfolio  will  only
purchase  "eligible  securities" that present minimal credit risks as determined
by the  Portfolio's  investment  adviser  pursuant to guidelines  adopted by the
Board of Directors. For a more complete description of eligible securities,  see
"Investment   Objectives   and   Policies--Money   Market    Portfolio--Eligible
Securities"  and  "Investment  Objectives  and  Policies"  in the  Statement  of
Additional Information.

     ILLIQUID SECURITIES. The Portfolio will not invest more than 10% of its net
assets in illiquid  securities as described  under  "Investment  Objectives  and
Policies--Money   Market   Portfolio--Illiquid   Securities"   and   "Investment
Objectives  and  Policies--Illiquid  Securities"  in the Statement of Additional
Information.

                  GOVERNMENT OBLIGATIONS MONEY MARKET PORTFOLIO

     The Government Obligations Money Market Portfolio's investment objective is
to provide  as high a level of current  interest  income as is  consistent  with
maintaining  liquidity  and  stability  of  principal.  It seeks to achieve such
objective  by investing  in  short-term  U.S.  Treasury  bills,  notes and other
obligations  issued or  guaranteed  by the U.S.  Government  or its  agencies or
instrumentalities,  and entering  into  repurchase  agreements  relating to such
obligations. The types of U.S. Government obligations in which the Portfolio may
invest  include a variety of U.S.  Treasury  obligations,  which  differ only in
their interest rates, maturities,  and times of issuance, and obligations issued
or  guaranteed  by the U.S.  Government  or its  agencies or  instrumentalities,
including  mortgage-related  securities.  Obligations  of certain  agencies  and
instrumentalities  of the  U.S.  Government,  such  as the  Government  National
Mortgage  Association  and the  Export-Import  Bank of the  United  States,  are
supported  by the full faith and credit of the U.S.  Treasury;  others,  such as
those of the Federal National Mortgage  Association,  are supported by the right
of the  issuer  to  borrow  from  the  Treasury;  others  are  supported  by the
discretionary  authority  of  the  U.S.  Government  to  purchase  the  agency's
obligations; still others, such as those of the Federal Farm Credit Banks or the
Federal Home Loan Mortgage Corporation,  are supported only by the credit of the
instrumentality.  No  assurance  can be given  that the  U.S.  Government  would
provide   financial   support   to   U.S.   Government-sponsored   agencies   or
instrumentalities  if it is not obligated to do so under law. The Portfolio will
invest in the  obligations of such agencies or  instrumentalities  only when the
investment  adviser  believes  that the  credit  risk with  respect  thereto  is
minimal.  There is no assurance that the  investment  objective of the Portfolio
will be achieved.

     Due to  fluctuations  in interest  rates,  the market  values of securities
issued or guaranteed by the U.S. Government,  its agencies and instrumentalities
may vary. Certain government securities held by the Portfolio may have remaining
maturities  exceeding 397 days if such  securities  provide for  adjustments  in
their interest rates not less frequently than every 397 days and the adjustments
are sufficient to cause the securities to have market values,  after adjustment,
which approximate their par values.

     REPURCHASE  AGREEMENTS.  The  Portfolio  may agree to  purchase  government
securities  from  financial  institutions  subject to the seller's  agreement to
repurchase them at an agreed-upon time and price ("repurchase agreements").  For
a more complete description of repurchase agreements, see "Investment Objectives
and Policies--Money Market Portfolio--Repurchase Agreements."

     REVERSE REPURCHASE  AGREEMENTS.  The Portfolio may borrow funds by entering
into  reverse   repurchase   agreements  in  accordance   with  the   investment
restrictions described below. The Portfolio would consider entering into reverse
repurchase  agreements to avoid otherwise selling  securities during unfavorable
market  conditions and to meet redemptions.  For a more complete  description of
reverse repurchase  agreements,  see "Investment  Objectives and Policies--Money
Market Portfolio--Reverse Repurchase Agreements."

                                       12

<PAGE>

     MORTGAGE-RELATED AND ASSET-BACKED SECURITIES.  Mortgage-related  securities
consist of mortgage loans which are assembled into pools, the interests in which
are  issued  and  guaranteed  by  an  agency  or  instrumentality  of  the  U.S.
Government,  though not necessarily by the U.S.  Government itself. The Fund may
also acquire asset-backed  securities as described under "Investment  Objectives
and Policies--Money Market Portfolio--Asset-Backed Securities."

     LENDING OF SECURITIES. The Portfolio may also lend its portfolio securities
to  financial  institutions  in  accordance  with  the  investment  restrictions
described below. Such loans would involve risks of delay in receiving additional
collateral in the event the value of the collateral decreased below the value of
the securities  loaned or of delay in recovering  the securities  loaned or even
loss of rights in the  collateral  should the  borrower of the  securities  fail
financially.  However,  loans  will be  made  only to  borrowers  deemed  by the
Portfolio's  investment  adviser to be of good  standing  and only when,  in the
adviser's  judgment,  the  income to be  earned  from the  loans  justifies  the
attendant  risks.  Any  loans  of  the  Portfolio's  securities  will  be  fully
collateralized and marked to market daily.

     ILLIQUID SECURITIES. The Portfolio will not invest more than 10% of its net
assets in illiquid  securities as described  under  "Investment  Objectives  and
Policies--Money   Market   Portfolio--Illiquid   Securities"   and   "Investment
Objectives  and  Policies--Illiquid  Securities"  in the Statement of Additional
Information.

                    NEW YORK MUNICIPAL MONEY MARKET PORTFOLIO

     The New York Municipal Money Market Portfolio's  investment objective is to
provide as high a level of current  interest income that is exempt from federal,
New York State and New York City  personal  income taxes as is  consistent  with
preservation  of  capital  and  liquidity.   During  periods  of  normal  market
conditions,   at  least  80%  of  the  assets  will  be  invested  in  Municipal
Obligations, the interest on which is Tax-Exempt Interest and which meet certain
ratings  criteria and present  minimal credit risks to the Portfolio.  Portfolio
obligations  held by the New York  Municipal  Money Market  Portfolio  will have
remaining maturities of 397 days or less ("short-term  obligations").  Dividends
paid by the Portfolio which are derived from interest attributable to tax-exempt
obligations of the State of New York and its political subdivisions,  as well as
of certain other  governmental  issuers such as Puerto Rico ("New York Municipal
Obligations"),  will be  excluded  from  gross  income  for  federal  income tax
purposes and exempt from New York State and New York City personal income taxes,
but will be  subject  to  corporate  franchise  taxes.  Dividends  derived  from
interest  on  tax-exempt  obligations  of  other  governmental  issuers  will be
excluded from gross income for federal income tax purposes,  but will be subject
to New York State and New York City  personal  income  taxes.  The Fund  expects
that, except during temporary  defensive  periods or when acceptable  securities
are  unavailable  for  investment by the Fund, at least 65% of the Fund's assets
will be invested in New York Municipal  Obligations.  There is no assurance that
the investment  objective of the New York Municipal Money Market  Portfolio will
be achieved.

     MUNICIPAL  OBLIGATIONS.  The  Portfolio  invests  in  short-term  Municipal
Obligations.  For a more  complete  discussion  of  Municipal  Obligations,  see
"Investment Objectives and Policies--Municipal Money Market Portfolio--Municipal
Obligations."

     Up to 20% of the Portfolio's assets may be invested in Alternative  Minimum
Tax Securities.  Investors should be aware of the possibility of federal,  state
and local  alternative  minimum or minimum income tax liability on interest from
Alternative Minimum Tax Securities.

     Although the New York Municipal Money Market Portfolio may invest more than
25% of its net assets in (i) Municipal Obligations the interest on which is paid
solely from  revenues  of similar  projects,  and (ii)  private  activity  bonds
bearing Tax-Exempt Interest,  it does not currently intend to do so on a regular
basis. To the extent the New York Municipal Money Market  Portfolio's assets are
concentrated  in  Municipal  Obligations  that are payable  from the revenues of
similar projects,  the Portfolio will be subject to the peculiar risks presented
by the laws and  economic  conditions  relating  to such states or projects to a
greater extent than it would be if its assets were not so concentrated.


                                       13

<PAGE>

     TAX-EXEMPT  DERIVATIVE  SECURITIES.  The Portfolio may invest in tax-exempt
derivative   securities  such  as  tender  option  bonds,   custodial  receipts,
participations,  beneficial interests in trusts and partnership interests. For a
more complete  description of such  securities,  see "Investment  Objectives and
Policies--Municipal Money Market Portfolio--Tax-Exempt Derivative Securities."

     WHEN-ISSUED   SECURITIES.   The  Portfolio  may  also  purchase   portfolio
securities on a "when-issued"  basis as described under  "Investment  Objectives
and Policies--Money Market Portfolio--When-Issued Securities."

     STAND-BY COMMITMENTS. The Portfolio may acquire "stand-by commitments" with
respect to Municipal  Obligations  held in its portfolio such as described under
"Investment   Objectives   and   Policies--Money   Market    Portfolio--Stand-By
Commitments."

     TAXABLE  INVESTMENTS.  The Portfolio  may for  defensive or other  purposes
invest in certain short-term taxable securities when the Portfolio's  investment
adviser  believes  that it  would be in the best  interests  of the  Portfolio's
investors to do so.  Taxable  securities  in which the Portfolio may invest on a
short-term  basis  are  obligations  of the U.S.  Government,  its  agencies  or
instrumentalities,  including  repurchase  agreements  with banks or  securities
dealers involving such securities; time deposits maturing in not more than seven
days;  other debt securities  rated within the two highest  ratings  assigned by
Moody's Investors Service,  Inc.  ("Moody's") or S&P;  commercial paper rated in
the  highest  grade by Moody's or S&P;  and  certificates  of deposit  issued by
United States branches of United States banks with assets of $1 billion or more.
At no time will more than 20% of the  Portfolio's  total  assets be  invested in
taxable  short-term  securities  unless the Portfolio's  investment  adviser has
determined to temporarily adopt a defensive  investment policy in the face of an
anticipated softening in the market for Municipal Obligations in general.

     ELIGIBLE  SECURITIES.  The New York Municipal  Money Market  Portfolio will
only  purchase  "eligible  securities"  that  present  minimal  credit  risks as
determined by the Portfolio's  investment adviser pursuant to guidelines.  For a
more complete description of eligible securities, see "Investment Objectives and
Policies--Money   Market   Portfolio--Eligible   Securities"   and   "Investment
Objectives and Policies" in the Statement of Additional Information.

     SPECIAL  CONSIDERATIONS.  As  a  non-diversified  investment  company,  the
Portfolio may invest a greater  proportion of its assets in the obligations of a
smaller number of issuers relative to a diversified portfolio.  As a result, the
value of a  non-diversified  investment  portfolio  will  fluctuate to a greater
degree upon changes in the value of each underlying  security than a diversified
portfolio. In the opinion of the Portfolio's investment adviser, any risk to the
Portfolio  would  be  mitigated  by  its  policies  restricting  investments  to
obligations with short-term maturities and obligations which qualify as eligible
securities.

     The Portfolio's ability to meet its investment  objective is dependent upon
the  ability  of  issuers  of New  York  Municipal  Obligations  to  meet  their
continuing  obligations  for the  payment of  principal  and  interest  on their
securities.  New York State and New York City face long-term  economic  problems
that could seriously  affect their ability and that of other issuers of New York
Municipal Obligations to meet their financial obligations.

     Investors  should be aware  that  certain  substantial  issuers of New York
Municipal  Obligations  (including  issuers whose obligations may be acquired by
the Portfolio) have experienced serious financial  difficulties in recent years.
These  difficulties  have at times  jeopardized the credit standing and impaired
the borrowing  abilities of all New York issuers and have generally  contributed
to higher  interest  costs  for their  borrowing  and  fewer  markets  for their
outstanding debt  obligations.  Although,  several different issues of municipal
securities of New York State and its agencies and  instrumentalities  and of New
York City have been  downgraded by S&P and Moody's.  In recent  years,  the most
recent actions of S&P and Moody's have been to place the debt obligations of New
York State and New York City on creditwatch  with positive  implications  and to
upgrade the debt obligations of New York City,  respectively.  Strong demand for
New York  Municipal  Obligations  has also at times had the effect of permitting
New York Municipal  Obligations to be issued with yields  relatively  lower, and
after  issuance  to  trade in the  market  at  prices  relatively  higher,  than
comparably  rated  municipal  obligations  issued  by  other  jurisdictions.   A
recurrence of the financial difficulties

                                       14

<PAGE>

previously  experienced by such issuers of New York Municipal  Obligations could
result in defaults or declines in the market values of those  issuers'  existing
obligations  and,  possibly,  in the  obligations  of other  issuers of New York
Municipal  Obligations.  Although no issuers of New York  Municipal  Obligations
were as of the date of this Prospectus in default with respect to the payment of
their debt  obligations,  the  occurrence  of any such default  could  adversely
affect the market values and marketability of all New York Municipal Obligations
and  consequently,  the net asset value of the Portfolio's  shares.  Some of the
significant financial  considerations  relating to the Fund's investments in New
York  Municipal  Obligations  are  summarized  in the  Statement  of  Additional
Information.

     ILLIQUID SECURITIES. The Portfolio will not invest more than 10% of its net
assets in illiquid  securities as described  under  "Investment  Objectives  and
Policies--Money   Market   Portfolio--Illiquid   Securities  "  and  "Investment
Objectives  and  Policies--Illiquid  Securities"  in the Statement of Additional
Information.

YEAR 2000
- --------------------------------------------------------------------------------

     Like  other  mutual  funds,   financial  and  business   organizations  and
individuals  around  the  world,  the Fund could be  adversely  affected  if the
computer systems used by the Adviser and the Fund's other service providers,  or
persons with whom they deal, do not properly process and calculate  date-related
information  and data  from and after  January  1,  2000.  This  possibility  is
commonly known as the "Year 2000 Problem." The Year 2000 Problem could also hurt
companies whose securities the Fund holds or securities markets  generally.  The
Fund has been advised by the Adviser,  the Administrators and the Custodian that
they are actively  taking steps to address the Year 2000 Problem with respect to
the computer  systems  that they use and to obtain  assurances  that  comparable
steps are being taken by the Fund's other major  service  providers. While there
can be no  assurance  that  the  Fund's  service  providers  will be  Year  2000
compliant,  the Fund's service providers expect that their plans to be compliant
will be achieved.

INVESTMENT LIMITATIONS
- --------------------------------------------------------------------------------

     The Money Market,  Municipal  Money Market,  Government  Obligations  Money
Market and New York Municipal  Money Market  Portfolios'  respective  investment
objectives and the policies  described  above may be changed by the Fund's Board
of Directors  without  shareholder  approval.  The Portfolios may not,  however,
change the following  investment  limitations  (except as noted)  without such a
vote of their  respective  shareholders.  (A more  detailed  description  of the
following  investment  limitations,  together with other investment  limitations
that  cannot be changed  without a vote of  shareholders,  is  contained  in the
Statement of Additional Information under "Investment Objectives and Policies.")

     The  Portfolios  may not borrow  money,  except  from  banks for  temporary
purposes and except for reverse repurchase  agreements,  and then in amounts not
in  excess  of 10% of the  value  of a  Portfolio's  assets  at the time of such
borrowing,  and only if after such borrowing there is asset coverage of at least
300% for all borrowings of the Portfolio; or mortgage, pledge or hypothecate any
of its assets except in connection with any such borrowing and in amounts not in
excess  of 10% of the  value  of a  Portfolio's  assets  at  the  time  of  such
borrowing;  or purchase portfolio securities while borrowings in excess of 5% of
the Portfolio's net assets are outstanding. (This borrowing provision is not for
investment  leverage,  but  solely to  facilitate  management  of a  Portfolio's
securities  by enabling the  Portfolio  to meet  redemption  requests  where the
liquidation  of  portfolio   securities  is  deemed  to  be  disadvantageous  or
inconvenient.)

     The Money Market and Municipal Money Market Portfolios may not:

        1. Purchase  securities of any one issuer,  other than securities issued
        or   guaranteed   by  the   U.S.   Government   or  its   agencies   and
        instrumentalities, if immediately after and as a result of such purchase
        more than 5% of the value of its total  assets  would be invested in the
        securities of such issuer,  or more than 10% of the  outstanding  voting
        securities of such issuer would be owned by a Portfolio,  except that up
        to 25% of the  value  of a  Portfolio's  total  assets  may be  invested
        without regard to such 5% limitation.

                                       15

<PAGE>



     The Money Market Portfolio may not:

        1. Purchase any securities other than Money Market Instruments,  some of
        which may be subject to  repurchase  agreements,  but the  Portfolio may
        make interest-bearing savings deposits in amounts not in excess of 5% of
        the value of the Portfolio's assets and may make time deposits.

        2. Purchase any securities  which would cause,  at the time of purchase,
        less than 25% of the value of the total  assets of the  Portfolio  to be
        invested in the  obligations of issuers in the banking  industry,  or in
        obligations, such as repurchase agreements,  secured by such obligations
        (unless the  Portfolio  is in a temporary  defensive  position) or which
        would cause, at the time of purchase,  more than 25% of the value of its
        total assets to be invested in the  obligations  of issuers in any other
        industry.

     So long as it values its portfolio securities on the basis of the amortized
cost method of  valuation  pursuant  to Rule 2a-7 under the 1940 Act,  the Money
Market  Portfolio  will meet the following  limitations  on its  investments  in
addition  to the  fundamental  investment  limitations  described  above.  These
limitations  may be changed  without a vote of  shareholders of the Money Market
Portfolio.

        1. The Money Market Portfolio will limit its purchases of the securities
        of any one issuer, other than issuers of U.S. Government securities,  to
        5% of its total  assets,  except  that the Money  Market  Portfolio  may
        invest more than 5% of its total assets in First Tier  Securities of one
        issuer for a period of up to three  Business  Days (as  defined  below).
        "First Tier Securities" include eligible securities that (i) if rated by
        more than one Rating  Organization,  are rated (at the time of purchase)
        by two or more Rating  Organizations  in the highest rating category for
        such  securities,  (ii) if rated by only one  Rating  Organization,  are
        rated by such Rating  Organization  in its highest  rating  category for
        such securities,  (iii) have no short-term  rating and are comparable in
        priority and security to a class of short-term obligations of the issuer
        of such  securities  that have been rated in accordance with (i) or (ii)
        above,  or (iv) are  Unrated  Securities  that are  determined  to be of
        comparable   quality  to  such  securities.   Purchases  of  First  Tier
        Securities  that come  within  categories  (ii) and (iv)  above  will be
        approved or ratified by the Board of Directors.

        2. The Money Market  Portfolio  will limit its  purchases of Second Tier
        Securities,   which  are  eligible  securities  other  than  First  Tier
        Securities, to 5% of its total assets.

        3. The Money Market  Portfolio  will limit its  purchases of Second Tier
        Securities  of one issuer to the greater of 1% of its total assets or $1
        million.

     The Municipal Money Market Portfolio may not:

        1. Purchase any securities  which would cause more than 25% of the value
        of the total assets of the  Portfolio to be invested in  obligations  at
        the time of purchase to be invested in issuers in the same industry.

     In addition, without shareholder approval, the Portfolio may not change its
policy of investing  during  normal  market  conditions  at least 80% of its net
assets in  obligations  the  interest  on which is  Tax-Exempt  Interest  or AMT
Interest.

     The Government Obligations Money Market Portfolio may not:

        1. Purchase  securities other than U.S. Treasury bills,  notes and other
        obligations issued or guaranteed by the U.S. Government, its agencies or
        instrumentalities,   and   repurchase   agreements   relating   to  such
        obligations.

                                       16

<PAGE>

        2. Make  loans  except  that the  Portfolio  may  purchase  or hold debt
        obligations in accordance  with its investment  objective,  policies and
        limitations,  may enter into repurchase  agreements for securities,  and
        may lend portfolio securities against collateral,  consisting of cash or
        securities   which  are  consistent  with  the   Portfolio's   permitted
        investments,  which is equal at all times to at least  100% of the value
        of the  securities  loaned.  There is no investment  restriction  on the
        amount of securities that may be loaned,  except that payments  received
        on such loans,  including amounts received during the loan on account of
        interest  on  the  securities   loaned,   may  not  (together  with  all
        non-qualifying income) exceed 10% of the Portfolio's annual gross income
        (without  offset for realized  capital gains) unless,  in the opinion of
        counsel to the Fund,  such amounts are  qualifying  income under federal
        income tax provisions applicable to regulated investment companies.

     The New York Municipal Money Market Portfolio may not:

        1. Purchase any securities which would cause 25% or more of the value of
        the  Portfolio's  total assets at the time of purchase to be invested in
        the securities of issuers conducting their principal business activities
        in the same industry;  provided that this limitation  shall not apply to
        Municipal   Obligations   or   governmental   guarantees   of  Municipal
        Obligations;  and  provided,  further,  that  for  the  purpose  of this
        limitation only, private activity bonds that are considered to be issued
        by non-governmental  users (see the second investment  limitation above)
        shall not be deemed to be Municipal Obligations.

     In addition, without shareholder approval, the Portfolio may not change its
policy of investing  during  normal  market  conditions  at least 80% of its net
assets in obligations the interest on which is Tax-Exempt Interest.


PURCHASE AND REDEMPTION OF SHARES
- --------------------------------------------------------------------------------

                               PURCHASE PROCEDURES

     GENERAL. Janney Shares are sold without a sales load on a continuous basis.
Investors  may  purchase  Janney  Shares  through an account  maintained  by the
investor with JMS ("the Account"). The Fund in its sole discretion may accept or
reject any order for purchases of Janney Shares.

     All  payments  for initial  and  subsequent  investments  should be in U.S.
dollars.  JMS is  responsible  for the prompt  transmission  of the order to the
Fund's  transfer  agent.  Purchases will be effected at the net asset value next
determined  after PFPC, the Fund's transfer agent, has received a purchase order
in good order from JMS and the Fund's  custodian has Federal  Funds  immediately
available to it. In those cases where  payment is made by check,  Federal  Funds
will generally become available two Business Days after the check is received by
JMS.  A  "Business  Day" is any day that both the New York Stock  Exchange  (the
"NYSE") and the Federal  Reserve Bank of  Philadelphia  (the "FRB") are open. On
any Business Day,  orders which are accompanied by Federal Funds and received by
PFPC by 12:00  noon  Eastern  Time,  and  orders  as to which  payment  has been
converted into Federal Funds by 12:00 noon Eastern Time,  will be executed as of
12:00 noon that Business Day.  Orders which are accompanied by Federal Funds and
received  by the Fund after  12:00 noon  Eastern  Time but prior to the close of
regular trading on the NYSE (generally 4:00 p.m. Eastern Time), and orders as to
which  payment has been  converted  into Federal  Funds after 12:00 noon Eastern
Time but prior to the close of regular  trading on the NYSE on any  Business Day
of the Fund,  will be executed as of the close of regular trading on the NYSE on
that  Business  Day, but will not be entitled to receive  dividends  declared on
such Business Day. Orders which are accompanied by Federal Funds and received by
the Fund as of the close of regular trading on the NYSE or later,  and orders as
to which payment has been  converted to Federal Funds as of the close of regular
trading on the NYSE or later on a  Business  Day will be  processed  as of 12:00
noon Eastern Time on the following Business Day.

                                       17

<PAGE>

     PURCHASES  THROUGH AN ACCOUNT.  Purchases of Shares may be effected through
an investor's Account with JMS through procedures established in connection with
the  requirements  of Accounts at JMS. In such event,  beneficial  ownership  of
Janney  Shares  will be  recorded  by JMS and will be  reflected  in the Account
statements provided by JMS to such investors.  JMS may impose minimum investment
Account requirements.  Although JMS does not impose a sales charge for purchases
of Janney Shares,  depending on the terms of an investor's Account with JMS, JMS
may  charge  an  investor's  Account  fees for  automatic  investment  and other
services provided to the Account.  Information  concerning Account requirements,
services and charges should be obtained from JMS, and this Prospectus  should be
read in conjunction with any information received from JMS.

     JMS may offer  investors  the ability to purchase  Janney  Shares  under an
automatic purchase program (a "Purchase Program") established by it. An investor
who participates in a Purchase Program will have his "free-credit" cash balances
in his  Account  with JMS  automatically  invested  in Shares  of  Janney  Class
designated  by the  investor  as the  "Primary  Janney  Class" for his  Purchase
Program. The frequency of investments and the minimum investment requirement may
be  established  by JMS and the Fund.  In  addition,  JMS may  require a minimum
amount of cash and/or  securities to be deposited in an Account for participants
in its Purchase  Program.  The  description  of the  particular  JMS's  Purchase
Program  should be read for details,  and any  inquiries  concerning  an Account
under a Purchase  Program should be directed to JMS. A participant in a Purchase
Program may change the designation of the Primary Janney Class at any time by so
instructing JMS.

     If JMS makes special  arrangements under which orders for Janney Shares are
received by PFPC prior to 12:00 noon Eastern Time, and the JMS  guarantees  that
payment for such Shares will be made in  available  Federal  Funds to the Fund's
custodian  prior to the close of regular  trading on the NYSE,  on the same day,
such  purchase  orders will be  effective  and Shares will be  purchased  at the
offering  price in effect as of 12:00 noon Eastern Time on the date the purchase
order is received by PFPC.

                              REDEMPTION PROCEDURES

     Redemption  orders  are  effected  at the net asset  value  per share  next
determined  after  receipt of the order in proper  form by the  Fund's  transfer
agent, PFPC. Investors may redeem all or some of their Shares in accordance with
one of the procedures described below.

     REDEMPTION  OF SHARES IN AN ACCOUNT.  An  investor  who  beneficially  owns
Janney  Shares  through an Account  may redeem  Janney  Shares in his Account in
accordance  with  instructions  and  limitations  pertaining  to his  Account by
contacting  JMS.  It is  the  responsibility  of JMS to  transmit  purchase  and
redemption orders to PFPC and credit its investors' accounts with the redemption
proceeds  on a timely  basis.  If such  notice is received by PFPC by 12:00 noon
Eastern Time on any Business Day, the  redemption  will be effective as of 12:00
noon Eastern Time on that day.  Payment of the redemption  proceeds will be made
after 12:00 noon Eastern Time on the day the  redemption  is effected,  provided
that the Fund's  custodian is open for  business.  If the custodian is not open,
payment will be made on the next bank business day. If the redemption request is
received  between  12:00 noon and the close of regular  trading on the NYSE on a
Business  Day,  the  redemption  will be  effective  as of the close of  regular
trading on the NYSE on such  Business  Day and payment  will be made on the next
bank business day following receipt of the redemption request. If all Shares are
redeemed, all accrued but unpaid dividends on those Shares will be paid with the
redemption proceeds.

     JMS will also redeem each day a sufficient  number of Shares of the Primary
Janney Class to cover debit balances  created by  transactions in the Account or
instructions for cash disbursements.  Janney Shares will be redeemed on the same
day that a transaction occurs that results in such a debit balance or charge.

     JMS reserves the right to waive or modify criteria for  participation in an
Account or to terminate participation in an Account for any reason.

                                       18

<PAGE>

     REDEMPTION  BY CHECK.  The Fund  provides  investors  with  forms of drafts
("checks")  payable  through PNC Bank.  These  checks may be made payable to the
order of  anyone.  An  investor  wishing to use this  check  writing  redemption
procedure  should complete  specimen  signature cards (available from PFPC), and
then forward such  signature  cards to JMS. JMS will then arrange for the checks
to be honored by PNC Bank.  Investors who own Janney  Shares  through an Account
should contact JMS for signature cards. Investors of joint accounts may elect to
have checks honored with a single  signature.  Check redemptions will be subject
to PNC Bank's rules governing  checks.  An investor will be able to stop payment
on a check  redemption.  The  Fund or PNC  Bank may  terminate  this  redemption
service at any time, and neither shall incur any liability for honoring  checks,
for effecting  redemptions to pay checks, or for returning checks which have not
been accepted.

     When a check is  presented  to PNC Bank for  clearance,  PNC  Bank,  as the
investor's  agent, will cause the Fund to redeem a sufficient number of full and
fractional  Shares owned by the investor to cover the amount of the check.  This
procedure  enables the investor to continue to receive dividends on those Shares
representing  the amount being redeemed by check until such time as the check is
presented to PNC Bank.  Pursuant to rules under the 1940 Act,  checks may not be
presented for cash payment at the offices of PNC Bank.  This limitation does not
affect checks used for the payment of bills or cash at other banks.

     ADDITIONAL  REDEMPTION  INFORMATION.  The Fund ordinarily will make payment
for all Shares  redeemed within seven days after receipt by PFPC of a redemption
request in proper form.  Although the Fund will redeem Shares purchased by check
before the check clears, payment of the redemption proceeds may be delayed for a
period of up to fifteen days after their purchase,  pending a determination that
the check has cleared. This procedure does not apply to Shares purchased by wire
payment.  Investors should consider  purchasing Shares using a certified or bank
check or  money  order  if they  anticipate  an  immediate  need for  redemption
proceeds.

     The Fund imposes no charge when Shares are redeemed.  The Fund reserves the
right to redeem any account in a Janney  Class  involuntarily,  on thirty  days'
notice,  if such  account  falls  below $500 and during  such  thirty day notice
period the amount  invested in such  account is not  increased to at least $500.
Payment  for  Shares  redeemed  may be  postponed  or the  right  of  redemption
suspended as provided by the rules of the Securities and Exchange Commission.

NET ASSET VALUE
- --------------------------------------------------------------------------------

     The net  asset  value  per share of each  class of the  Portfolios  for the
purpose of pricing purchase and redemption  orders is determined twice each day,
once as of 12:00 noon Eastern  Time and once as of the close of regular  trading
on the NYSE on each weekday with the exception of those holidays on which either
the NYSE or the FRB is closed. Currently, the NYSE is closed on weekends and the
customary  national business holidays of New Year's Day, Dr. Martin Luther King,
Jr. Day,  Presidents' Day, Good Friday,  Memorial Day,  Independence  Day, Labor
Day,  Thanksgiving  Day and Christmas Day and the preceding Friday or subsequent
Monday  when one of these  holidays  falls on a Saturday  or Sunday.  The FRB is
currently  closed on weekends and the same  holidays on which the NYSE is closed
as well as Veterans' Day and Columbus Day. The net asset value per share of each
class is  calculated by adding the  proportionate  interest of each class in the
value of the securities, cash and other assets of the Portfolio, subtracting the
accrued  and  actual  liabilities  of the class and  dividing  the result by the
number of outstanding shares of the class. The net asset value per share of each
class  of the  Fund  is  determined  independently  of any of the  Fund's  other
classes.

     The Fund seeks to maintain for each of the  Portfolios a net asset value of
$1.00 per share for  purposes  of  purchases  and  redemptions  and  values  its
portfolio  securities  on the basis of the  amortized  cost method of  valuation
described  in  the  Statement  of  Additional   Information  under  the  heading
"Valuation of Shares."  There can be no assurance that net asset value per share
will not vary.

                                       19

<PAGE>

     With the approval of the Board of Directors,  a Portfolio may use a pricing
service,  bank  or  broker-dealer  experienced  in such  matters  to  value  the
Portfolio's  securities.  A more  detailed  discussion  of net  asset  value and
security valuation is contained in the Statement of Additional Information.

MANAGEMENT
- --------------------------------------------------------------------------------

BOARD OF DIRECTORS

     The  business  and affairs of the Fund and each  investment  portfolio  are
managed under the direction of the Fund's Board of Directors. The Fund currently
operates or proposes to operate  seventeen  investment  portfolios.  Each of the
Janney  Classes  represents  interests in one of the following  portfolios:  the
Money Market  Portfolio,  the Municipal Money Market  Portfolio,  the Government
Obligations  Money  Market  Portfolio  and the New York  Municipal  Money Market
Portfolio.

INVESTMENT ADVISER

     BIMC,  an indirect  majority-owned  subsidiary  of PNC Bank,  serves as the
investment adviser for each of the Portfolios. BIMC has its principal offices at
Bellevue Park  Corporate  Center,  400 Bellevue  Parkway,  Wilmington,  Delaware
19809.  PNC Bank and its  subsidiaries  currently  manage over $45.9  billion of
assets,  of which  approximately  $31.4  billion are mutual  funds.  PNC Bank, a
national  bank  whose  principal   business   address  is  1600  Market  Street,
Philadelphia,  Pennsylvania 19103, is a wholly-owned  subsidiary of PNC Bancorp,
Inc. PNC Bancorp,  Inc. is a bank holding company and a wholly-owned  subsidiary
of PNC Bank Corp., a multi-bank holding company.

     As investment  adviser to the Portfolios,  BIMC manages such Portfolios and
is responsible for all purchases and sales of portfolio securities.  In entering
into Portfolio  transactions  for a Portfolio with a broker,  BIMC may take into
account  the  sale  by  such  broker  of  shares  of the  Fund,  subject  to the
requirements  of best  execution.  The  agreements  between  BIMC and RBB,  with
respect to the money market and government  obligations money market portfolios,
respectively,  provide  for BIMC to also assist  generally  in  supervising  the
operations  of such  portfolios,  and to  maintain  such  portfolios'  financial
accounts and records. These administrative  responsibilities have been delegated
to PFPC, as described below.

     For the services  provided to and expenses assumed by it for the benefit of
each of the Money Market and  Government  Obligations  Money Market  Portfolios,
BIMC is entitled  to receive  the  following  fees,  computed  daily and payable
monthly based on a Portfolio's  average daily net assets: .45% of the first $250
million; .40% of the next $250 million; and .35% of net assets in excess of $500
million.

     For the services  provided  and expenses  assumed by it with respect to the
Municipal Money Market and New York Municipal Money Market  Portfolios,  BIMC is
entitled to receive the following fees, computed daily and payable monthly based
on the  Portfolio's  average  daily net assets:  .35% of the first $250 million;
 .30% of the next $250 million; and .25% of net assets in excess of $500 million.

     BIMC may in its discretion from time to time agree to waive voluntarily all
or any portion of its advisory fee for any Portfolio.

     For the Fund's fiscal year ended August 31, 1998, the Fund paid  investment
advisory  fees  aggregating  .24% of the average net assets of the Money  Market
Portfolio,  .08%  of the  average  net  assets  of the  Municipal  Money  Market
Portfolio,  .30% of the average net assets of the Government  Obligations  Money
Market  Portfolio  and .05% of the average net assets of the New York  Municipal
Money Market  Portfolio.  For that same year,  BIMC waived  approximately  .12%,
 .26%,  .14%,  and .30% of the average net assets of the Money Market  Portfolio,
the Municipal Money Market

                                       20

<PAGE>

Portfolio,  the Government  Obligations  Money Market Portfolio and the New York
Municipal Money Market Portfolio, respectively.

     PNC Bank was formerly  sub-adviser  to the money  market,  municipal  money
market and  government  obligations  portfolios  and provided  research,  credit
analysis and recommendations  with respect to each such portfolio's  investments
and supplied  certain  computer  facilities,  personnel and other services.  The
facilities,  personnel,  services and related  expenses have been transferred to
bimc and in return,  BIMC'S  obligation to pay a portion of the sub-advisory fee
to PNC Bank has been  terminated.  For its sub-advisory  services,  PNC Bank was
entitled to receive from bimc an amount equal to 75% of the investment  advisory
fee paid by each such portfolio to BIMC. The  sub-advisory  fees paid by BIMC to
PNC  Bank  had no  effect  on the  investment  advisory  fees  payable  by  such
portfolios  to BIMC.  The services  provided by BIMC and the fees payable by the
portfolio  for  these  services  are  described  further  in  the  statement  of
additional information under "Management of the Company."

ADMINISTRATOR

     PFPC serves as the  administrator  for the  Municipal  Money Market and New
York Municipal Money Market Portfolios and generally assists those Portfolios in
all aspects of its administration and operations,  including matters relating to
the  maintenance  of financial  records and  accounting.  PFPC is entitled to an
administration  fee,  computed daily and payable  monthly at .10% of the average
daily  net  assets  of  each  of  these  Portfolios.  Pursuant  to its  advisory
agreements  with the Fund  with  respect  to the  Money  Market  and  Government
Obligations Money Market Portfolios,  BIMC provides  administrative  services to
such Portfolios pursuant to the same terms, but has delegated to PFPC all of its
accounting and administrative  obligations under such advisory  agreements.  The
Fund  has  agreed  to  pay  directly  to  PFPC  the  fees  for   accounting  and
administrative  services to the Money Market and  Government  Obligations  Money
Market  Portfolios  which PFPC  would have  received  directly  from BIMC.  Such
arrangement has no effect on the total advisory and administrative  fees payable
by such Portfolios to BIMC.  PFPC's  principal  business address is 400 Bellevue
Parkway, Wilmington, Delaware 19809.

TRANSFER AGENT, DIVIDEND DISBURSING AGENT AND CUSTODIAN

     PFPC Trust  Company  serves as the Fund's  custodian  and PFPC, an indirect
wholly-owned  subsidiary  of PNC Bank Corp.,  will  succeed  PNC Bank,  National
Association  ("PNC  Bank") as the Fund's  custodian  pursuant to an  assignment.
PNCBank will continue to provide  certain  services to PFPC Trust Company.  PFPC
serves as the Fund's transfer agent and dividend disbursing agent. The principal
offices of PFPC are located at 400 Bellevue Parkway, Wilmington, Delaware 19809.
PFPC  may  enter  into   shareholder   servicing   agreements   with  registered
broker-dealers  who have entered into dealer agreements with the Distributor for
the  provision  of certain  shareholder  support  services to  customers of such
Authorized  Dealers who are shareholders of the Fund. The services  provided and
the fees payable by the Fund for these  services are  described in the Statement
of Additional Information under "Investment Advisory, Distribution and Servicing
Arrangements."

DISTRIBUTOR

     Provident Distributors, Inc. (the "Distributor"), with a principal business
address at Four Falls Corporate Center, West Conshohocken,  Pennsylvania, 19428,
acts as  distributor  of the  Shares of each of the  Janney  Classes of the Fund
pursuant  to a  distribution  agreement  dated May 29,  1998 (the  "Distribution
Agreement").

                                       21

<PAGE>

EXPENSES

     The expenses of each  Portfolio  are deducted from the total income of such
Portfolio  before  dividends are paid. Any general expenses of the Fund that are
not readily  identifiable as belonging to a particular  investment  portfolio of
the Fund will be allocated  among all  investment  portfolios  of the Fund based
upon the relative net assets of the investment portfolios. The Janney Classes of
the Fund pay their own  distribution  fees and may pay a  different  share  than
other classes of the Fund of other  expenses  (excluding  advisory and custodial
fees) if those  expenses  are  actually  incurred in a  different  amount by the
Janney Classes or if they receive different services.

     The investment  adviser may assume  expenses of the Portfolios from time to
time.  In certain  circumstances,  it may assume such  expenses on the condition
that it is reimbursed by the  Portfolios  for such amounts prior to the end of a
fiscal  year.  In such event,  the  reimbursement  of such amounts will have the
effect of  increasing  a  Portfolio's  expense  ratio and of  lowering  yield to
investors.

     For the Fund's fiscal year ended August 31, 1998, the Fund's total expenses
were 1.21% of the  average net assets  with  respect to the Janney  Class of the
Money Market  Portfolio (not taking into account waivers and  reimbursements  of
 .21%),  1.16% of the average net assets with  respect to the Janney Class of the
Municipal   Money  Market   Portfolio  (not  taking  into  account  waivers  and
reimbursements  of .30%),  1.23% of the average  net assets with  respect to the
Janney Class of the Government  Obligations  Money Market  Portfolio (not taking
into account  waivers and  reimbursements  of .23%) and 1.20% of the average net
assets with respect to the Janney Class of the New York  Municipal  Money Market
Portfolios (not taking into account waivers and reimbursements of .40%).

DISTRIBUTION OF SHARES
- --------------------------------------------------------------------------------

     The Board of  Directors of the Fund  approved and adopted the  Distribution
Agreement  and  separate  Plans  of   Distribution   for  each  of  the  Classes
(collectively,  the  "Plans")  pursuant to Rule 12b-1 under the 1940 Act.  Under
each of the Plans,  the  Distributor  is entitled to receive  from the  relevant
Janney Class a distribution fee, which is accrued daily and paid monthly,  of up
to .65% on an  annualized  basis of the average daily net assets of the relevant
Janney Class. The actual amount of such compensation is agreed upon from time to
time  by  the  Fund's  Board  of  Directors  and  the  Distributor.   Under  the
Distribution  Agreement,  the Distributor has agreed to accept  compensation for
its services thereunder and under the Plans in the amount of .60% of the average
daily  net  assets of the  relevant  Class on an  annualized  basis in any year.
Pursuant to the  conditions of an exemptive  order granted by the Securities and
Exchange Commission, the Distributor has agreed to waive its fee with respect to
a  Janney  Class  on any day to the  extent  necessary  to  assure  that the fee
required to be accrued by such Class does not exceed the income of such Class on
that day. In addition, the Distributor may, in its discretion, voluntarily waive
from time to time all or any portion of its distribution fee.

     Under the Distribution Agreement and the relevant Plan, the Distributor may
re-allocate  an  amount  up to the  full  fee  that  it  receives  to  financial
institutions,  including  Dealers,  based upon the aggregate  investment amounts
maintained  by and  services  provided to  shareholders  of any  relevant  Class
serviced by such  financial  institutions.  The  Distributor  may also reimburse
Dealers for other expenses incurred in the promotion of the sale of Fund shares.
The  Distributor  and/or  Dealers  pay  for  the  cost  of  printing  (excluding
typesetting)  and  mailing  to  prospective  investors  prospectuses  and  other
materials  relating to the Fund as well as for related direct mail,  advertising
and promotional expenses.

     Each of the Plans obligates the Fund, during the period it is in effect, to
accrue and pay to the  Distributor on behalf of each Janney Class the fee agreed
to under the Distribution  Agreement.  Payments under the Plans are not based on
expenses  actually  incurred by the  Distributor,  and the  payments  may exceed
distribution expenses actually incurred.

                                       22

<PAGE>

DIVIDENDS AND DISTRIBUTIONS
- --------------------------------------------------------------------------------

     The Fund will distribute substantially all of the net investment income and
net  realized  capital  gains,  if  any,  of  each  of the  Portfolios  to  each
Portfolio's  shareholders.  All  distributions  are  reinvested  in the  form of
additional  full and  fractional  Shares of the  relevant  Janney Class unless a
shareholder elects otherwise.

     The net investment income (not including any net short-term  capital gains)
earned by each  Portfolio  will be  declared  as a dividend on a daily basis and
paid monthly.  Dividends are payable to shareholders of record immediately prior
to the  determination of net asset value made as of the close of regular trading
on the NYSE. Net short-term capital gains, if any, will be distributed at  least
annually.

TAXES
- --------------------------------------------------------------------------------

     Distributions   from  the  Money  Market   Portfolio  and  the   Government
Obligations Money Market Portfolio will generally be taxable to shareholders. It
is expected that all, or substantially all, of these  distributions will consist
of  ordinary  income.  You will be subject to income tax on these  distributions
regardless whether they are paid in cash or reinvested in additional shares. The
one major exception to these tax principles is that distributions on shares held
in an IRA (or other tax-qualified plan) will not be currently taxable.

     Distributions  from the Municipal  Money Market  Portfolio and the New York
Municipal Money Market Portfolio will generally constitute tax-exempt income for
shareholders for federal income tax purposes. It is possible, depending upon the
Portfolios' investments,  that a portion of the Portfolios'  distributions could
be taxable to shareholders  as ordinary  income or capital gains,  but it is not
expected that this will be the case.

     Although  distributions  from the Municipal Money Market  Portfolio and the
New York  Municipal  Money Market  Portfolio  are exempt for federal  income tax
purposes,  they will  generally  constitute  taxable  income for state and local
income tax purposes except that,  subject to limitations  that vary depending on
the state,  distributions  from interest paid by a state or municipal entity may
be exempt from tax in that state.

     Interest on  indebtedness  incurred by a  shareholder  to purchase or carry
shares of the Municipal Money Market  Portfolio and the New York Municipal Money
Market  Portfolio  generally  will not be  deductible  for  federal  income  tax
purposes.

     You should note that a portion of the exempt-interest dividends paid by the
Municipal  Money  Market  Portfolio  and the New  York  Municipal  Money  Market
Portfolio may  constitute an item of tax  preference for purposes of determining
federal alternative minimum tax liability.  Exempt-interest  dividends will also
be considered along with other adjusted gross income in determining  whether any
Social Security or railroad  retirement  payments received by you are subject to
federal income taxes.

     Exempt  interest  dividends  derived  from  interest on New York  Municipal
Obligations will be exempt from New York State and New York City personal income
(but not  corporate  franchise)  taxes.  The New  York  Municipal  Money  Market
Portfolio  will determine  annually the percentage  amounts exempt from New York
State and New York City personal income taxes, and the amounts,  if any, subject
to such taxes.  The exclusion or exemption of interest income for federal income
tax purposes,  or New York State or New York City personal  income tax purposes,
in most cases does not  result in an  exemption  under the tax laws of any other
state or local authority.

     The  foregoing  is only a summary of certain tax  considerations  under the
current law,  which may be subject to change in the future.  You should  consult
your tax adviser for further information regarding federal,  state, local and/or
foreign tax consequences relevant to your specific situation.

                                       23

<PAGE>

DESCRIPTION OF SHARES
- --------------------------------------------------------------------------------

     The Fund has  authorized  capital of thirty billion shares of Common Stock,
$.001 par  value  per  share,  of which  18.326  billion  shares  are  currently
classified  into 97  different  classes  of Common  Stock (see  "Description  of
Shares" in the Statement of Additional Information).

     The Fund  offers  multiple  classes of shares in each of its Money  Market,
Municipal  Money  Market,  Government  Obligations  Money  Market  and New  York
Municipal Money Market  Portfolios to expand its marketing  alternatives  and to
broaden  its range of  services  to  different  investors.  The  expenses of the
various classes within these  Portfolios vary based upon the services  provided,
which may  affect  performance.  Each  class of  Common  Stock of the Fund has a
separate Rule 12b-1 distribution plan. Under the Distribution  Agreement entered
into with the Distributor and pursuant to each of the  distribution  plans,  the
Distributor  is  entitled  to  receive  from  each  class  as  compensation  for
distribution services provided to that class a distribution fee based on average
daily  net  assets.  A  salesperson  or any other  person  entitled  to  receive
compensation for servicing Fund shares may receive  different  compensation with
respect to different classes in a Portfolio of the Fund. An investor may contact
the Fund's  Distributor by calling  1-800-888-9723  to request more  information
concerning other classes available.

     THIS  PROSPECTUS AND THE STATEMENT OF ADDITIONAL  INFORMATION  INCORPORATED
HEREIN RELATE  PRIMARILY TO THE JANNEY  CLASSES OF THE MONEY  MARKET,  MUNICIPAL
MONEY MARKET,  GOVERNMENT  OBLIGATIONS MONEY MARKET AND NEW YORK MUNICIPAL MONEY
MARKET  PORTFOLIOS  AND DESCRIBE ONLY THE  INVESTMENT  OBJECTIVES  AND POLICIES,
OPERATIONS,  CONTRACTS AND OTHER MATTERS RELATING TO THE JANNEY CLASSES OF THESE
PORTFOLIOS.

     Each  share  that  represents  an  interest  in a  Portfolio  has an  equal
proportionate interest in the assets belonging to such Portfolio with each other
share that  represents an interest in such  Portfolio,  even where a share has a
different class designation than another share  representing an interest in that
Portfolio.  Shares of the Fund do not have preemptive or conversion rights. When
issued for payment as described in this  Prospectus,  Shares of the Fund will be
fully paid and non-assessable.

     The Fund currently does not intend to hold annual  meetings of shareholders
except  as  required  by the 1940 Act or other  applicable  law.  The law  under
certain circumstances provides shareholders with the right to call for a meeting
of shareholders to consider the removal of one or more directors.  To the extent
required  by law,  the Fund will  assist in  shareholder  communication  in such
matters.

     Holders of shares of each of the Portfolios  will vote in the aggregate and
not by class on all matters,  except where otherwise  required by law.  Further,
shareholders of all investment portfolios of the Fund will vote in the aggregate
and not by portfolio  except as  otherwise  required by law or when the Board of
Directors determines that the matter to be voted upon affects only the interests
of the shareholders of a particular investment portfolio.  (See the Statement of
Additional Information under "Additional Information Concerning Fund Shares" for
examples when the 1940 Act requires voting by investment portfolio or by class.)
Shareholders  of the Fund are  entitled  to one vote for each  full  share  held
(irrespective of class or portfolio) and fractional votes for fractional  shares
held.  Voting rights are not cumulative  and,  accordingly,  the holders of more
than 50% of the  aggregate  shares of Common  Stock of the Fund may elect all of
the directors.

     As of November 16, 1998, to the Fund's knowledge,  no person held of record
beneficially 25% or more of the outstanding  shares of all of the classes of the
Fund.

                                       24

<PAGE>

OTHER INFORMATION
- --------------------------------------------------------------------------------

REPORTS AND INQUIRIES

     Shareholders  will receive  unaudited  semi-annual  reports  describing the
Fund's  investment   operations  and  annual  financial  statements  audited  by
independent  accountants.  Shareholder  inquiries  should be addressed to Janney
Montgomery Scott,  1801 Market Street,  Philadelphia,  PA 19103-1675;  toll free
1-800-JANNEYS.

                                       25

<PAGE>

                      (THIS PAGE INTENTIONALLY LEFT BLANK.)

<PAGE>

================================================================================
NO  PERSON  HAS  BEEN   AUTHORIZED   TO  GIVE  ANY   INFORMATION   OR  MAKE  ANY
REPRESENTATIONS  NOT CONTAINED IN THIS PROSPECTUS OR IN THE FUND'S  STATEMENT OF
ADDITIONAL INFORMATION  INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE
OFFERING MADE BY THIS  PROSPECTUS  AND, IF GIVEN OR MADE,  SUCH  INFORMATION  OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE FUND OR
ITS DISTRIBUTOR.  THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY THE FUND OR
BY THE  DISTRIBUTOR IN ANY  JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY
BE MADE.




                              --------------------
                                TABLE OF CONTENTS
                                                                            PAGE
Fee Table ................................................................     2
Financial Highlights .....................................................     3
Investment Objectives and Policies .......................................     8
Year 2000 ................................................................    15
Investment Limitations ...................................................    15
Purchase and Redemption of Shares ........................................    17
Net Asset Value ..........................................................    19
Management ...............................................................    20
Distribution of Shares ...................................................    22
Dividends and Distributions ..............................................    23
Taxes ....................................................................    23
Description of Shares ....................................................    24
Other Information ........................................................    25

INVESTMENT ADVISER
BlackRock Institutional Management Corporation
Wilmington, Delaware

DISTRIBUTOR
Provident Distributors, Inc.
West Conshohocken, Pennsylvania

CUSTODIAN
PFPC Trust Company
Wilmington, Delaware

ADMINISTRATOR AND TRANSFER AGENT
PFPC Inc.
Wilmington, Delaware

COUNSEL
Drinker Biddle & Reath LLP
Philadelphia, Pennsylvania

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers LLP
Philadelphia, Pennsylvania
================================================================================

<PAGE>

                                       RBB

                          Select Money Market Portfolio




                       Prospectus and Summary Description
                          for the Select Shares of the
                             Money Market Portfolio



                                December 29, 1998


<PAGE>


                                       RBB

                          SELECT MONEY MARKET PORTFOLIO
                                       OF
                               THE RBB FUND, INC.



     The Select  Class  consists  of one class of common  stock of The RBB Fund,
Inc. (the "Fund"), an open-end management investment company. The shares offered
by this  Prospectus  ("Select  Shares" or "Shares")  represent  interests in the
Fund's Money Market Portfolio.

     The  investment  objective of the Money  Market  Portfolio is to provide as
high a level of  current  interest  income  as is  consistent  with  maintaining
liquidity  and  stability of  principal.  It seeks to achieve such  objective by
investing in a  diversified  portfolio of U.S.  dollar-denominated  money market
instruments.

     SHARES OF THE FUND ARE NOT DEPOSITS OR  OBLIGATIONS  OF, OR  GUARANTEED  OR
ENDORSED BY PNC BANK, NATIONAL ASSOCIATION, PFPC TRUST COMPANY OR ANY OTHER BANK
AND  SHARES  ARE  NOT  FEDERALLY   INSURED  BY  THE  FEDERAL  DEPOSIT  INSURANCE
CORPORATION,  THE FEDERAL  RESERVE  BOARD, OR ANY OTHER  AGENCY. INVESTMENTS  IN
SHARES OF THE FUND INVOLVE  INVESTMENT  RISKS,  INCLUDING  THE POSSIBLE  LOSS OF
PRINICIPAL.  THERE  CAN BE NO  ASSURANCE  THAT  THE  PORTFOLIO  WILL  BE ABLE TO
MAINTAIN A STABLE NET ASSET VALUE OF $1.00 PER SHARE.

     BlackRock Institutional Management Corporation serves as investment adviser
for the Portfolio,  PFPC Trust Company serves as custodian for the Fund and PFPC
Inc. serves as administrator and transfer and dividend  disbursing agent for the
Fund. Provident Distributors, Inc. acts as distributor for the Fund.

     Select Shares are sold by the Fund's  distributor  to  investment  advisers
maintaining accounts with PNC Bank or its affiliates. Select Shares will also be
sold to customers, including individuals, trusts, partnerships and corporations,
who maintain  accounts with PNC Bank or its affiliates,  and who have authorized
PNC Bank or its  affiliates to invest their assets in the Fund.  Shares are sold
and redeemed  without any  purchase or  redemption  charge  imposed by the Fund,
although PNC Bank or its  affiliates  may charge their  customers in  connection
with the management of their accounts.

     This Prospectus  contains concise  information that a prospective  investor
needs to know before investing. Please keep it for future reference. A Statement
of  Additional  Information,  dated  December  29,  1998 has been filed with the
Securities  and Exchange  Commission  and is  incorporated  by reference in this
Prospectus.  It  may  be  obtained  free  of  charge  by  calling  the  Fund  at
1-800-430-9618.  The Prospectus and Statement of Additional Information are also
available for reference,  along with other related  material on the SEC Internet
Website (http://www.sec.gov).

- --------------------------------------------------------------------------------
THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE SECURITIES COMMISSION PASSED UPON THE ADEQUACY OF THIS PROSPECTUS. ANY
REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------

PROSPECTUS                                                     December 29, 1998

<PAGE>

INTRODUCTION
- --------------------------------------------------------------------------------

     The  RBB  Fund,  Inc.  is  an  open-end   management   investment   company
incorporated  under the laws of the State of Maryland on February 29, 1988.  The
Fund is  currently  operating  or  proposing  to  operate  seventeen  investment
portfolios.  Shares of the Select Class ("Select  Class" or "Class") of the Fund
offered  by this  Prospectus  represent  interests  in the Fund's  Money  Market
Portfolio (the "Money Market Portfolio" or the "Portfolio").

     The investment  objective of the Portfolio is to provide as high a level of
current  interest  income  as  is  consistent  with  maintaining  liquidity  and
stability of  principal.  It seeks to achieve  such  objective by investing in a
diversified portfolio of U.S.  dollar-denominated money market instruments which
meet certain  ratings  criteria  and which  present  minimal  credit  risks.  In
pursuing its investment objective, the Money Market Portfolio invests in a broad
range of government,  bank and commercial  obligations  that may be available in
the money markets.

     The  Portfolio  seeks to  maintain  a net asset  value of $1.00 per  share;
however, there can be no assurance that it will be able to maintain a stable net
asset value of $1.00 per share.

     The Portfolio's  investment adviser is BlackRock  Institutional  Management
Corporation  ("BIMC").  PFPC Trust  Company  serves as custodian to the Fund and
PFPC Inc. ("PFPC") serves as administrator and transfer and dividend  disbursing
agent to the Fund.  Provident  Distributors,  Inc. (the  "Distributor")  acts as
distributor of the Fund's shares.

     An investment in the Portfolio is subject to certain risks, as set forth in
detail under "Investment  Objective and Policies." The Portfolio,  to the extent
set forth under "Investment Objective and Policies," may engage in the following
investment  practices:  the use of repurchase  agreements and reverse repurchase
agreements;  the purchase of asset-backed securities; the purchase of securities
on a  "when-issued"  or "forward  commitment"  basis;  the  purchase of stand-by
commitments;  and the lending of securities.  All of these transactions  involve
certain special risks, as set forth under "Investment Objective and Policies."

     For detailed information of how to purchase or redeem Select Shares, please
refer to the section of this  Prospectus  entitled  "Purchase and  Redemption of
Shares." 

FEE TABLE

     The following table illustrates the estimated annual operating expenses for
Select  Shares  of  the  Portfolio  (after  expected  fee  waivers  and  expense
reimbursements)  for the current fiscal period.  An example based on the summary
is also shown.

ANNUAL FUND OPERATING EXPENSES (SELECT SHARES)                   MONEY MARKET
     AS A PERCENTAGE OF AVERAGE DAILY NET ASSETS                   PORTFOLIO
                                                                 ------------
Management fees (after waivers)(1) ..............................    .22%
Other Expenses ..................................................    .05
                                                                    ----
Total Fund Operating Expenses (after waivers)(1) ................    .27%
                                                                    ====
(1)  Management  Fees are based on average  daily net assets and are  calculated
daily and paid monthly. Before waivers,  Management Fees would be .37% and Total
Fund Operating Expenses would be .42%.

                                       2
<PAGE>

EXAMPLE*

     An  investor  would  pay the  following  expenses  on a $1,000  investment,
assuming (1) 5% annual return and (2) redemption at the end of each time period:

                                                1 YEAR     3 YEARS
                                                ------     -------
Money Market Portfolio* .....................     $3          $9 

* Other  Classes of this  Portfolio are sold with different fees and expenses.

     The Example in the Fee Table assumes that all  dividends and  distributions
are  reinvested  and  that the  amounts  listed  under  "Annual  Fund  Operating
Expenses"  remain  the  same in the  years  shown.  THE  EXAMPLE  SHOULD  NOT BE
CONSIDERED A  REPRESENTATION  OF PAST OR FUTURE EXPENSES AND ACTUAL EXPENSES MAY
BE GREATER OR LESS THAN THOSE SHOWN.

     The Fee Table is  designed  to  assist an  investor  in  understanding  the
various  costs and expenses  that an investor in Select  Shares of the Fund will
bear  directly or  indirectly.  (For more complete  descriptions  of the various
costs and  expenses,  see  "Management--Investment  Adviser"  below.) The figure
shown in the Fee Table for "Management Fees" is based on actual fees incurred by
the Portfolio during its last fiscal year. "Other Expenses" is estimated for the
current  fiscal year.  The Fee Table  reflects a voluntary  waiver of Management
Fees for the  Portfolio.  However,  there can be no  assurance  that any  future
waivers of  Management  Fees will not vary from the figure  reflected in the Fee
Table. In addition,  the investment  adviser is currently  voluntarily  assuming
additional  expenses  of the  Portfolio.  There  can be no  assurance  that  the
investment  adviser  will  continue  to  assume  such  expenses.  Assumption  of
additional  expenses  will have the  effect of  lowering a  Portfolio's  overall
expense ratio and increasing its yield to investors.

     From time to time the Portfolio may advertise the "total  return,"  "yield"
and "effective yield" of its Select Shares.  TOTAL RETURN AND YIELD FIGURES WILL
BE  BASED  ON  HISTORICAL   EARNINGS  AND  WILL  NOT  BE  INDICATIVE  OF  FUTURE
PERFORMANCE.  The "yield" of the Portfolio  refers to the income generated by an
investment  in Select  Shares of the  Portfolio  over a seven-day  period (which
period shall be stated in the advertisement).  This income is then "annualized."
That is, the amount of income  generated by the  investment  during that week is
assumed  to be  generated  each  week over a  52-week  period  and is shown as a
percentage of the investment. The "effective yield" is calculated similarly but,
when  annualized,  the income  earned by an  investment  in Select Shares of the
Portfolio is assumed to be reinvested.  The  "effective  yield" will be slightly
higher  than the  "yield"  because  of the  compounding  effect of this  assumed
reinvestment.

     The total  return and yield of any  investment  is  generally a function of
portfolio  quality and  maturity,  type of  investment,  operating  expenses and
market  conditions.  The total return and yield on Shares will  fluctuate and is
not necessarily  representative of future results.  Any fees charged by PNC Bank
or  its  affiliates  directly  to  their  customers  in  connection  with  their
investment  accounts will not be reflected in the total return and yields on the
Portfolio's  Shares,  and such fees,  if charged,  will reduce the actual return
received by customers on their investments. The total return and yield on Shares
of the Select  Class may differ from total return and total return and yields on
shares of other classes of the Portfolio depending on the allocation of expenses
to each of the classes of the Portfolio.

INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------

     The Money Market Portfolio's  investment  objective is to provide as high a
level of current interest income as is consistent with maintaining liquidity and
stability of principal. Portfolio obligations held by the Money Market Portfolio
have remaining  maturities of 397 days or less (exclusive of securities  subject
to  repurchase  agreements).  In pursuing its  investment  objective,  the Money
Market Portfolio invests in a diversified  portfolio of U.S.  dollar-denominated
instruments,  such as government,  bank and commercial obligations,  that may be
available  in the  money  markets  ("Money  Market  Instruments")  and that meet
certain ratings criteria and present minimal credit risks to the Money Market

                                       3
<PAGE>

Portfolio.  See "Eligible  Securities." There is no assurance that the Portfolio
will achieve its investment objective. The following descriptions illustrate the
types of Money Market Instruments in which the Money Market Portfolio invests.

     BANK OBLIGATIONS.  The Portfolio may purchase obligations of issuers in the
banking  industry,  such as short-term  obligations  of bank holding  companies,
certificates of deposit, bankers' acceptances and time deposits,  including U.S.
dollar-denominated  instruments  issued or  supported  by the credit of U.S.  or
foreign  banks  or  savings  institutions  having  total  assets  at the time of
purchase in excess of $1 billion.  The  Portfolio  may invest  substantially  in
obligations  of  foreign  banks or  foreign  branches  of U.S.  banks  where the
investment  adviser deems the instrument to present  minimal credit risks.  Such
investments  may  nevertheless  entail  risks in  addition  to those of domestic
issuers,   including  higher   transaction   costs,   less  complete   financial
information,  less stringent regulatory  requirements and less market liquidity.
The Portfolio may also make interest-bearing  savings deposits in commercial and
savings banks in amounts not in excess of 5% of its total assets.

     COMMMERCIAL  PAPER.  The Portfolio may purchase  commercial paper (i) rated
(at the time of purchase) in the two highest  rating  categories of at least two
nationally recognized statistical rating organizations  ("Rating  Organization")
or,  by the only  Rating  Organization  providing  a rating;  or (ii)  issued by
issuers (or, in certain cases guaranteed by persons) with short-term debt having
such  ratings.  These  rating  categories  are  described in the Appendix to the
Statement of Additional  Information.  The  Portfolio may also purchase  unrated
commercial  paper  provided  that such paper is  determined  to be of comparable
quality by the  Portfolio's  investment  adviser in accordance  with  guidelines
approved by the Fund's Board of Directors.

     Commercial paper purchased by the Portfolio may include  instruments issued
by foreign issuers,  such as Canadian  Commercial  Paper ("CCP"),  which is U.S.
dollar-denominated  commercial  paper  issued  by a  Canadian  corporation  or a
Canadian counterpart of a U.S.  corporation,  and in Europaper,  which is a U.S.
dollar-denominated commercial paper of a foreign issuer, subject to the criteria
stated above for other commercial paper issuers.

     VARIABLE RATE DEMAND NOTES. The Portfolio may purchase variable rate demand
notes, which are unsecured  instruments that permit the indebtedness  thereunder
to vary and provide for periodic  adjustment in the interest rate.  Although the
notes are not normally traded and there may be no active secondary market in the
notes, the Portfolio will be able (at any time or during  specified  periods not
exceeding 13 months,  depending upon the note involved) to demand payment of the
principal  of a note.  The  notes  are not  typically  rated  by  credit  rating
agencies,  but  issuers of  variable  rate  demand  notes must  satisfy the same
criteria as set forth above for issuers of commercial  paper.  If an issuer of a
variable  rate demand note  defaulted on its payment  obligation,  the Portfolio
might be unable to  dispose  of the note  because  of the  absence  of an active
secondary market.  For this or other reasons,  the Portfolio might suffer a loss
to the extent of the  default.  The  Portfolio  invests in variable  rate demand
notes only when the  Portfolio's  investment  adviser  deems the  investment  to
involve  minimal credit risk. The Portfolio's  investment  adviser also monitors
the continuing  creditworthiness  of issuers of such notes to determine  whether
the Portfolio should continue to hold such notes.

     REPURCHASE AGREEMENTS.  The Portfolio may agree to purchase securities from
financial  institutions  subject to the seller's agreement to repurchase them at
an agreed upon time and price  ("repurchase  agreements").  The securities  held
subject to a  repurchase  agreement  may have  stated  maturities  exceeding  13
months, provided the repurchase agreement itself matures in less than 13 months.
Default by or bankruptcy of the seller would,  however,  expose the Portfolio to
possible loss because of adverse market action or delays in connection  with the
disposition of the underlying obligations.

     U.S. GOVERNMENT OBLIGATIONS.  The Portfolio may purchase obligations issued
or  guaranteed  by the U.S.  Government  or its agencies and  instrumentalities.
Obligations of certain agencies and instrumentalities of the U.S. Government are
backed by the full faith and credit of the United  States.  Others are backed by
the right of the issuer to borrow  from the U.S.  Treasury or are backed only by
the credit of the agency or instrumentality issuing the obligation.

                                       4
<PAGE>

     ASSET-BACKED   SECURITIES.   The  Portfolio  may  invest  in   asset-backed
securities which are backed by mortgages,  installment  sales contracts,  credit
card  receivables  or  other  assets  and  collateralized  mortgage  obligations
("CMOs") issued and guaranteed by U.S. Government Agencies and instrumentalities
or issued by private companies.  Asset backed securities also include adjustable
rate securities.  The estimated life of an asset-backed security varies with the
prepayment experience with respect to the underlying debt instruments.  For this
and other reasons, an asset-backed  security's stated maturity may be shortened,
and the  security's  total return may be difficult  to predict  precisely.  Such
difficulties  are not expected,  however,  to have a  significant  effect on the
Portfolio since the remaining  maturity of any  asset-backed  security  acquired
will be 13 months or less.  Asset-backed  securities  are considered an industry
for industry concentration purposes. See "Investment Limitations." In periods of
falling  interest  rates,  the rate of mortgage  prepayments  tends to increase.
During these periods, the reinvestment of proceeds by a portfolio will generally
be at lower rates than the rates on the prepaid obligations.

     REVERSE  REPURCHASE  AGREEMENTS.  The  Portfolio  may  enter  into  reverse
repurchase agreements with respect to portfolio securities. A reverse repurchase
agreement   involves  a  sale  by  a  portfolio  of  securities  that  it  holds
concurrently  with an agreement by the portfolio to repurchase them at an agreed
upon time and price.  Reverse  repurchase  agreements  involve the risk that the
market value of the securities sold by the Portfolio may decline below the price
at which the  Portfolio is  obligated to  repurchase  them.  Reverse  repurchase
agreements are considered to be borrowings by the Portfolio under the Investment
Company Act of 1940 (the "1940 Act").

     MUNICIPAL  OBLIGATIONS.   In  addition,  the  Portfolio  may,  when  deemed
appropriate by its  investment  adviser in light of the  Portfolio's  investment
objective,  invest  without  limitation  in high quality,  short-term  Municipal
Obligations  issued by state and local  governmental  issuers,  the  interest on
which may be taxable or tax-exempt  for federal  income tax  purposes,  provided
that such  obligations  carry  yields that are  competitive  with those of other
types of Money Market  Instruments  of comparable  quality.  For a more complete
discussion of Municipal  Obligations,  see  Statement of Additional  Information
under "Investment Objectives and Policies."

     GUARANTEED  INVESTMENT  CONTRACTS.  The Portfolio may make  investments  in
obligations  such  as  guaranteed   investment  contracts  and  similar  funding
agreements  (collectively,  "GICs"),  issued  by  highly  rated  U.S.  insurance
companies.  A GIC is a general  obligation of the issuing  insurance company and
not a separate account. The Portfolio's  investments in GICs are not expected to
exceed 5% of its total  assets at the time of  purchase  absent  unusual  market
conditions.   GIC  investments  are  subject  to  the  Fund's  policy  regarding
investment in illiquid securities.

     STAND-BY COMMITMENTS. The Portfolio may acquire "stand-by commitments" with
respect  to  Municipal  Obligations  held in its  portfolio.  Under  a  stand-by
commitment, a dealer would agree to purchase at the Portfolio's option specified
Municipal  Obligations  at a  specified  price.  The  acquisition  of a stand-by
commitment may increase the cost and thereby reduce the yield,  of the Municipal
Obligation to which such commitment relates. The Portfolio will acquire stand-by
commitments  solely to  facilitate  portfolio  liquidity  and does not intend to
exercise its rights thereunder for trading purposes.

     WHEN-ISSUED SECURITIES.  The Portfolio may purchase portfolio securities on
a  "when-issued"  basis.  When-issued  securities are  securities  purchased for
delivery  beyond the normal  settlement  date at a stated  price and yield.  The
Portfolio will generally not pay for such  securities or start earning  interest
on them until they are received. Securities purchased on a when-issued basis are
recorded as an asset at the time the  commitment is entered into and are subject
to changes in value prior to delivery based upon changes in the general level of
interest rates. The Portfolio  expects that commitments to purchase  when-issued
securities  will not exceed 25% of the value of its total assets absent  unusual
market  conditions.  The  Portfolio  does not  intend  to  purchase  when-issued
securities  for  speculative  purposes but only in furtherance of its investment
objective.

                                       5
<PAGE>

     ELIGIBLE SECURITIES. The Portfolio will only purchase "eligible securities"
that present  minimal credit risks as determined by the  Portfolio's  investment
adviser  pursuant  to  guidelines  adopted by the Board of  Directors.  Eligible
securities  generally include:  (1) U.S. Government  securities,  (2) securities
that are rated (or whose issuer or, in certain  cases,  guarantor,  is rated) at
the time of purchase in the two highest rating categories by at least two Rating
Organizations ("Rating  Organizations")  (e.g.,  commercial paper rated "A-1" or
"A-2" by Standard & Poor's Ratings  Services  ("S&P")),  (3) securities that are
rated (or whose issuer or, in certain cases, guarantor, is rated) at the time of
purchase by the only Rating  Organization  rating the security in one of its two
highest rating categories for such securities,  (4) securities issued by issuers
(or, in certain cases  guaranteed by persons) with  short-term  debt having such
ratings,  and (5) securities  (including  guarantees) that are not rated and are
issued by an issuer that does not have comparable  obligations rated by a Rating
Organization   ("Unrated   Securities"),   provided  that  such  securities  are
determined to be of comparable quality to eligible rated securities.  For a more
complete  description of eligible  securities,  see  "Investment  Objectives and
Policies" in the Statement of Additional Information.

     ILLIQUID SECURITIES. The Portfolio will not invest more than 10% of its net
assets in illiquid  securities,  including  repurchase  agreements  which have a
maturity of longer than seven days,  time deposits with  maturities in excess of
seven days,  variable  rate demand notes with demand  periods in excess of seven
days unless the Portfolio's  investment  adviser  determines that such notes are
readily  marketable  and could be sold  promptly at the prices at which they are
valued, GICs, and other securities that are illiquid by virtue of the absence of
a readily  available  market or legal or  contractual  restrictions  on  resale.
Repurchase  agreements  subject to demand are deemed to have a maturity equal to
the notice period.  Securities  that have legal or contractual  restrictions  on
resale but have a readily  available market are not deemed illiquid for purposes
of  this  limitation.  The  Portfolio's  investment  adviser  will  monitor  the
liquidity of such  restricted  securities  under the supervision of the Board of
Directors. See "Investment Objectives and Policies - Illiquid Securities" in the
Statement of Additional Information.

YEAR 2000
- --------------------------------------------------------------------------------

     Like  other  mutual  funds,   financial  and  business   organizations  and
individuals  around  the  world,  the Fund could be  adversely  affected  if the
computer systems used by the Adviser and the Fund's other service providers,  or
persons with whom they deal, do not properly process and calculate  date-related
information  and data  from and after  January  1,  2000.  This  possibility  is
commonly known as the "Year 2000 Problem." The Year 2000 Problem could also hurt
companies whose securities the Fund holds or securities markets  generally.  The
Fund has been advised by the Adviser,  the Administrators and the Custodian that
they are actively  taking steps to address the Year 2000 Problem with respect to
the computer  systems  that they use and to obtain  assurances  that  comparable
steps are being taken by the Fund's other major service  providers.  While there
can be no  assurance  that  the  Fund's  service  providers  will be  Year  2000
compliant the Fund's service  providers  expect that their plans to be compliant
will be achieved.

INVESTMENT LIMITATIONS
- --------------------------------------------------------------------------------

     The Portfolio's  investment  objective and policies  described above may be
changed by the Fund's  Board of  Directors  without  shareholder  approval.  The
Portfolio may not, however,  change the investment  limitations summarized below
without  such a vote  of  shareholders.  (A  more  detailed  description  of the
following  investment  limitations,  together with other investment  limitations
that  cannot be changed  without a vote of  shareholders,  is  contained  in the
Statement of Additional Information under "Investment Objectives and Policies.")

                                       6
<PAGE>

     The Money Market Portfolio may not:

         1. Purchase any securities other than Money Market Instruments, some of
     which may be subject to repurchase  agreements,  but the Portfolio may make
     interest-bearing  savings  deposits  in amounts  not in excess of 5% of the
     value of the Portfolio's assets and may make time deposits.

         2. Borrow money,  except from banks for  temporary  purposes and except
     for reverse repurchase  agreements and then in amounts not in excess of 10%
     of the value of the Portfolio's  assets at the time of such borrowing,  and
     only if after such  borrowing  there is asset coverage of at least 300% for
     all borrowings of the Portfolio; or mortgage,  pledge or hypothecate any of
     its assets except in connection  with any such borrowing and in amounts not
     in excess of 10% of the value of the Portfolio's assets at the time of such
     borrowing;  or purchase portfolio  securities while borrowings in excess of
     5% of the Portfolio's net assets are outstanding. (This borrowing provision
     is not for investment leverage,  but solely to facilitate management of the
     Portfolio's  securities  by  enabling  the  Portfolio  to  meet  redemption
     requests  where the  liquidation  of portfolio  securities  is deemed to be
     disadvantageous or inconvenient.)

         3. Purchase any securities  which would cause, at the time of purchase,
     less  than 25% of the  value of the total  assets  of the  Portfolio  to be
     invested  in the  obligations  of issuers in the  banking  industry,  or in
     obligations,  such as repurchase  agreements,  secured by such  obligations
     (unless the Portfolio is in a temporary  defensive position) or which would
     cause,  at the time of  purchase,  more  than 25% of the value of its total
     assets to be invested in the obligations of issuers in any other industry.

         4. Purchase securities of any one issuer,  other than securities issued
     or guaranteed by the U.S. Government or its agencies and instrumentalities,
     if  immediately  after and as a result of such purchase more than 5% of the
     value of its total  assets  would be  invested  in the  securities  of such
     issuer,  or more  than 10% of the  outstanding  voting  securities  of such
     issuer would be owned by the Portfolio,  except that up to 25% of the value
     of the Portfolio's  total assets may be invested  without regard to such 5%
     limitation.

     So long as it values its portfolio securities on the basis of the amortized
cost method of valuation pursuant to Rule 2a-7 under the 1940 Act, the Portfolio
will meet the  following  limitations  on its  investments  in  addition  to the
fundamental  investment  limitations  described above.  These limitations may be
changed without a shareholder vote.

         1. The Portfolio will limit its purchases of the securities (other than
     securities with certain types of guarantees) of any one issuer,  other than
     issuers of U.S. Government  securities,  to 5% of its total assets,  except
     that the  Portfolio  may invest  more than 5% of its total  assets in First
     Tier Securities of one issuer for a period of up to three Business Days (as
     defined  below).   "First  Tier  Securities"   generally  include  eligible
     securities  that (i) if rated  (or  guaranteed  by a person  which has been
     rated)  by more  than one  Rating  Organization,  are rated (at the time of
     purchase)  by two or  more  Rating  Organizations  in  the  highest  rating
     category  for such  securities,  (ii) if rated (or  guaranteed  by a person
     which has been  rated) by only one Rating  Organization,  are rated by such
     Rating  Organization  in its highest rating  category for such  securities,
     (iii) have no short-term rating and are comparable in priority and security
     to a class of short-term  obligations of the issuer of such securities that
     have been rated in  accordance  with (i) or (ii) above (or have a guarantee
     which  satisfies this  standard),  or (iv) are Unrated  Securities that are
     determined  to be of  comparable  quality  to such  securities  (or  have a
     guarantee which satisfies this standard).  The Portfolio's  compliance with
     this  diversification  requirement  is  deemed  to be  compliance  with the
     fundamental diversification limit in paragraph 4 above.

         2. The Portfolio  will limit its  purchases of Second Tier  Securities,
     which are eligible  securities other than First Tier  Securities,  to 5% of
     its total assets.

         3. The Portfolio will limit its purchases of Second Tier  Securities of
     one issuer to the greater of 1% of its total assets or $1 million.

                                       7
<PAGE>

PURCHASE AND REDEMPTION OF SHARES
- --------------------------------------------------------------------------------

                               PURCHASE PROCEDURES

     GENERAL. Select Shares are sold without a sales load on a continuous basis.
The minimum initial investment by an investor is $200 million. The Fund reserves
the right to waive this minimum  investment  requirement in its sole discretion.
There is no minimum subsequent  investment.  The Fund in its sole discretion may
accept or reject any order for purchases of Select Shares.

     Investors may purchase  Select Shares through an account  maintained by the
investor  with PNC Bank or its  affiliates  ("the  Account").  All  payments for
initial and subsequent  investments  should be in U.S. dollars.  PNC Bank or its
affiliates are responsible for the prompt  transmission of its customers' orders
to the Fund's transfer agent.  Purchases will be effected at the net asset value
next determined  after PFPC, the Fund's transfer agent,  has received a purchase
order in good order from PNC Bank or its affiliates and the Fund's custodian has
Federal Funds immediately  available to it. In those cases where payment is made
by check,  Federal Funds will generally become available two Business Days after
the check is received by PNC Bank or its affiliates. A "Business Day" is any day
that both the New York Stock Exchange (the "NYSE") and the Federal  Reserve Bank
of  Philadelphia  (the "FRB") are open.  On any Business  Day,  orders which are
accompanied  by Federal  Funds and received by PFPC by 12:00 noon Eastern  Time,
and orders as to which  payment has been  converted  into Federal Funds by 12:00
noon Eastern Time,  will be executed as of 12:00 noon that Business Day.  Orders
which are accompanied by Federal Funds and received by the Fund after 12:00 noon
Eastern  Time but prior to the close of regular  trading on the NYSE  (generally
4:00 p.m.  Eastern Time), and orders as to which payment has been converted into
Federal  Funds after 12:00 noon  Eastern  Time but prior to the close of regular
trading on the NYSE on any Business Day of the Fund,  will be executed as of the
close of  regular  trading  on the NYSE on that  Business  Day,  but will not be
entitled to receive  dividends  declared on such Business Day.  Orders which are
accompanied by Federal Funds and received by the Fund as of the close of regular
trading on the NYSE or later,  and orders as to which payment has been converted
to Federal  Funds as of the close of  regular  trading on the NYSE or later on a
Business Day will be  processed  as of 12:00 noon Eastern Time on the  following
Business Day.

     PURCHASES  THROUGH AN ACCOUNT.  Purchases of Select  Shares may be effected
through an investor's Account with PNC Bank or its affiliates through procedures
established in connection  with the  requirements of Accounts at PNC Bank or its
affiliates.  In such event,  beneficial  ownership of Shares will be recorded by
PNC Bank or its  affiliates  and will be  reflected  in the  Account  statements
provided  by PNC  Bank or its  affiliates  to such  investors.  PNC  Bank or its
affiliates may impose minimum investment Account requirements. Although PNC Bank
or its  affiliates  do not  impose  a sales  charge  for  purchases  of  Shares,
depending on the terms of an investor's Account with PNC Bank or its affiliates,
PNC Bank or its affiliates  may charge an investor's  Account fees for automatic
investment and other services  provided to the Account.  Information  concerning
Account  requirements,  services and charges should be obtained from PNC Bank or
its  affiliates,  and this  Prospectus  should be read in  conjunction  with any
information received from PNC Bank or its affiliates.

     PNC Bank or its  affiliates  may offer  investors  the  ability to purchase
Select  Shares  under an  automatic  purchase  program  (a  "Purchase  Program")
established by PNC Bank or its  affiliates.  An investor who  participates  in a
Purchase Program will have his  "free-credit"  cash balances in his Account with
PNC Bank or its  affiliates  automatically  invested in Shares of the Portfolio.
The  frequency of  investments  and the minimum  investment  requirement  may be
established by PNC Bank or its affiliates and the Fund. In addition, PNC Bank or
its  affiliates  may require a minimum  amount of cash and/or  securities  to be
deposited  in  an  Account  for  participants  in  the  Purchase  Program.   The
description  of the  Purchase  Program  should  be  read  for  details,  and any
inquiries  concerning an Account or a Purchase Program should be directed to PNC
Bank or its affiliates.

                                       8
<PAGE>


     If PNC Bank or its affiliates makes special arrangements under which orders
for Select Shares are received by PFPC prior to 12:00 noon Eastern Time, and PNC
Bank or its affiliates  guarantees  that payment for such Shares will be made in
available  Federal Funds to the Fund's  custodian  prior to the close of regular
trading on the NYSE, on the same day, such purchase orders will be effective and
Shares  will be  purchased  at the  offering  price in effect  as of 12:00  noon
Eastern Time on the date the purchase order is received by PFPC.

                              REDEMPTION PROCEDURES

     Redemption  orders  are  effected  at the net asset  value  per share  next
determined  after  receipt of the order in proper  form by the  Fund's  transfer
agent, PFPC. Investors may redeem all or some of their Shares in accordance with
one of the procedures described below.

     REDEMPTION  OF SHARES IN AN ACCOUNT.  An  investor  who  beneficially  owns
Select  Shares  through an Account  may redeem  Select  Shares in his Account in
accordance  with  instructions  and  limitations  pertaining  to his  Account by
contacting PNC Bank or its affiliates.  It is the  responsibility of PNC Bank or
its affiliates to transmit purchase and redemption orders to PFPC and credit its
investors'  accounts with the  redemption  proceeds on a timely  basis.  If such
notice is received by PFPC by 12:00 noon Eastern  Time on any Business  Day, the
redemption will be effective as of 12:00 noon Eastern Time on that day.  Payment
of the redemption proceeds will be made after 12:00 noon Eastern Time on the day
the  redemption  is  effected,  provided  that the Fund's  custodian is open for
business.  If the  custodian is not open,  payment will be made on the next bank
business day. If the redemption  request is received  between 12:00 noon and the
close of regular  trading on the NYSE on a Business Day, the redemption  will be
effective  as of the close of regular  trading on the NYSE on such  Business Day
and payment will be made on the next bank business day following  receipt of the
redemption request. If all Shares are redeemed, all accrued but unpaid dividends
on those Shares will be paid with the redemption proceeds.

     PNC Bank or its affiliates will also redeem each day a sufficient number of
Shares to cover  debit  balances  created  by  transactions  in the  Account  or
instructions  for cash  disbursements.  Shares  will be redeemed on the same day
that a transaction occurs that results in such a debit balance or charge.

     PNC Bank or its affiliates  reserves the right to waive or modify  criteria
for participation in an Account or to terminate  participation in an Account for
any reason.

     ADDITIONAL  REDEMPTION  INFORMATION.  The Fund ordinarily will make payment
for all Shares  redeemed within seven days after receipt by PFPC of a redemption
request in proper form.  Although the Fund will redeem Shares purchased by check
before the check clears, payment of the redemption proceeds may be delayed for a
period of up to fifteen days after their purchase,  pending a determination that
the check has cleared. This procedure does not apply to Shares purchased by wire
payment.  Investors should consider  purchasing Shares using a certified or bank
check or  money  order  if they  anticipate  an  immediate  need for  redemption
proceeds.

     The Fund imposes no charge when Shares are redeemed.  The Fund reserves the
right to redeem any account in the Select Class  involuntarily,  on thirty days'
notice,  if such  account  falls  below $500  million and during such thirty day
notice  period the amount  invested in such account is not increased to at least
$500  million.  Payment for Shares  redeemed  may be  postponed  or the right of
redemption  suspended  as provided by the rules of the  Securities  and Exchange
Commission.

NET ASSET VALUE
- --------------------------------------------------------------------------------

     The net asset value per share of the Select Class of the  Portfolio for the
purpose of pricing purchase and redemption  orders is determined twice each day,
once as of 12:00 noon Eastern  Time and once as of the close of regular  trading
on the NYSE on each weekday with the exception of those holidays on which either
the NYSE or the FRB is closed.

                                       9
<PAGE>

Currently,  the NYSE is closed on weekends and the customary  national  business
holidays of New Year's Day, Dr. Martin Luther King,  Jr. Day,  Presidents'  Day,
Good Friday,  Memorial Day,  Independence  Day, Labor Day,  Thanksgiving Day and
Christmas Day and on the preceding Friday or subsequent Monday when one of these
holidays falls on a Saturday or Sunday.  The FRB is currently closed on weekends
and the  same  holidays  as the  NYSE is  closed  as well as  Veterans'  Day and
Columbus  Day.  The net asset value per share of each class of the  Portfolio is
calculated by adding the value of the proportionate interest of the class in the
securities, cash and other assets of the Portfolio, deducting actual and accrued
liabilities  of the class and dividing  the result by the number of  outstanding
shares of the  class.  The net asset  value of each  class of the  Portfolio  is
calculated independently of each other class.

     The Fund  seeks to  maintain  a net  asset  value of $1.00  per  Share  for
purposes of purchases and redemptions and values its portfolio securities on the
basis of the  amortized  cost method of valuation  described in the Statement of
Additional  Information under the heading "Valuation of Shares." There can be no
assurance that net asset value per share will not vary.

     With the  approval  of the  Board of  Directors,  the  Portfolio  may use a
pricing service, bank or broker-dealer  experienced in such matters to value the
Portfolio's  securities.  A more  detailed  discussion  of net  asset  value and
security valuation is contained in the Statement of Additional Information.

MANAGEMENT
- --------------------------------------------------------------------------------

BOARD OF DIRECTORS

     The business and affairs of the Fund and each of its investment  portfolios
are managed  under the  direction  of the Fund's  Board of  Directors.  The Fund
currently  operates  or  proposes  to  operate  seventeen  separate   investment
portfolios. The Select Class represents interests in the Money Market Portfolio.

INVESTMENT ADVISER

     BIMC,  an indirect  majority-owned  subsidiary  of PNC Bank,  serves as the
investment adviser for the Portfolio. BIMC has its principal offices at Bellevue
Park Corporate  Center,  400 Bellevue Parkway,  Wilmington,  Delaware 19809. PNC
Bank and its  subsidiaries  currently  manage over $45.9  billion of assets,  of
which  approximately  $31.4 billion are mutual funds.  PNC Bank, a national bank
whose  principal   business   address  is  1600  Market  Street,   Philadelphia,
Pennsylvania  19103,  is a  wholly-owned  subsidiary  of PNC  Bancorp,  Inc. PNC
Bancorp,  Inc. is a bank holding  company and a  wholly-owned  subsidiary of PNC
Bank Corp., a multi-bank holding company.

     As investment adviser to the Portfolio,  BIMC manages such Portfolio and is
responsible  for all  purchases and sales of Portfolio  securities.  In entering
into Portfolio  transactions for the Portfolio with a broker, BIMC may take into
account  the  sale  by  such  broker  of  shares  by the  Fund,  subject  to the
requirements of best execution. The agreement between BIMC and RBB, with respect
to the Money Market  Portfolio,  provides  for BIMC to also assist  generally in
supervising  the  operations of the Portfolio,  and to maintain the  Portfolio's
financial accounts and records. These administrative  responsibilities have been
delegated to PFPC, as described below.

     For the services  provided to and expenses assumed by it for the benefit of
the Money  Market  Portfolio,  BIMC is entitled to receive the  following  fees,
computed daily and payable  monthly based on the  Portfolio's  average daily net
assets: .45% of the first $250 million;  .40% of the next $250 million; and .35%
of the average  daily net assets of such  Portfolio  in excess of $500  million.
BIMC may in its discretion  from time to time agree to waive  voluntarily all or
any portion of its advisory fee for the Portfolio.

                                       10
<PAGE>

     For the period  ended August 31, 1998,  the Fund paid  investment  advisory
fees aggregating  .24% of the average net assets of the Portfolio.  For the same
period,  BIMC waived fees of approximately .13% of the average net assets of the
Portfolio.

     PNC Bank was formerly  sub-adviser to the Portfolio and provided  research,
credit analysis and recommendations with respect to the Portfolio's  investments
and supplied  certain  computer  facilities,  personnel and other services.  The
facilities,  personnel,  services and related  expenses have been transferred to
BIMC and in return,  BIMC's  obligation to pay a portion of the sub-advisory fee
to PNC bank has been  terminated.  For its sub-advisory  services,  PNC Bank was
entitled to receive from BIMC an amount equal to 75% of the investment  advisory
fee  paid  by  the   Portfolio  to  BIMC   (subject  to  adjustment  in  certain
circumstances).  The sub-advisory fees paid by BIMC to PNC Bank had no effect on
the  investment  advisory  fees payable by the  Portfolio to BIMC.  The services
provided by BIMC and the fees payable by the  Portfolio  for these  services are
described  further in the Statement of Additional  Information under "Management
of the Company."

TRANSFER AGENT, DIVIDEND DISBURSING AGENT, AND CUSTODIAN

     PFPC Trust Company, an indirect wholly-owned  subsidiary of PNC Bank Corp.,
will succeed PNC Bank, National Association ("PNC Bank") as the Fund's custodian
pursuant to an assignment. PNC Bank will continue to provide certain services to
PFPC Trust Company.  PFPC  serves as the  Fund's  transfer  agent  and  dividend
disbursing  agent.  The  principal  offices of PFPC are located at 400  Bellevue
Parkway,  Wilmington,Delaware  19809. PFPC may enter into shareholder  servicing
agreements  with  registered   broker-dealers   who  have  entered  into  dealer
agreements  with the  Distributor  ("Authorized  Dealers")  for the provision of
certain shareholder support services to customers of such Authorized Dealers who
are shareholders of the Fund. The services  provided and the fees payable by the
Fund for these services are described in the Statement of Additional Information
under "Investment Advisory, Distribution and Servicing Arrangements."

ADMINISTRATOR

     Pursuant  to  its  advisory   agreement   with  the  Fund,   BIMC  provides
administrative  services to the Portfolio,  and is entitled to an administration
fee,  computed daily and payable  monthly at .10% of average daily net assets of
the   Portfolio.   BIMC  has  delegated  to  PFPC  all  of  its  accounting  and
administrative obligations under such advisory agreement. The Fund has agreed to
pay directly to PFPC the fees for accounting and administrative  services to the
Money Market  Portfolio which PFPC would have received  directly from BIMC. Such
arrangement has no effect on the total advisory and administrative  fees payable
by such Portfolio to BIMC.  PFPC's  principal  business  address is 400 Bellevue
Parkway, Wilmington, Delaware 19809.

DISTRIBUTOR

     Provident  Distributors,  Inc., with a principal  business  address at Four
Falls  Corporate  Center,   West  Conshohocken,   Pennsylvania  19428,  acts  as
Distributor for the Fund pursuant to a distribution agreement dated May 29, 1998
(the "Distribution Agreement").

EXPENSES

     The expenses of the  Portfolio  are  deducted  from the total income of the
Portfolio  before  dividends are paid. Any general expenses of the Fund that are
not readily  identifiable as belonging to a particular  investment  portfolio of
the Fund will be allocated among all investment  portfolios of the Fund based on
the relative net assets of the  investment  portfolios at the time such expenses
were accrued.  The Select Class of the Portfolio may pay a different  share than
other  classes  of the  Portfolio  of other  expenses  (excluding  advisory  and
custodial fees) if those expenses are actually incurred in a different amount by
the Select Class.

                                       11
<PAGE>

     The  investment  adviser may assume  expenses of the Portfolio from time to
time.  In certain  circumstances,  it may assume such  expenses on the condition
that it be  reimbursed  by the  Portfolio for such amounts prior to the end of a
fiscal year. The assumption of expenses by the investment  adviser will have the
effect of lowering the Portfolio's  expense ratio and of increasing its yield to
investors.

BANKING LAWS

     Banking laws and  regulations  currently  prohibit a bank  holding  company
registered  under the Federal  Bank  Holding  Company Act of 1956 or any bank or
non-bank  affiliate  thereof  from  sponsoring,   organizing,   controlling,  or
distributing   the  shares  of  a  registered,   open-end   investment   company
continuously engaged in the issuance of its shares, and prohibit banks generally
from issuing, underwriting, selling or distributing securities, but such banking
laws and  regulations  do not  prohibit  such a holding  company or affiliate or
banks generally from acting as investment  adviser,  transfer agent or custodian
to such an investment  company,  or from purchasing  shares of such a company as
agent for and upon the  order of such a  customer.  PNC Bank,  BIMC and PFPC are
subject to such banking laws and regulations. In addition, state securities laws
on this issue may differ  from the  interpretations  of  federal  law  expressed
herein and banks and  financial  institutions  may be  required  to  register as
dealers pursuant to state law.

     Should future  legislative,  judicial or administrative  action prohibit or
restrict the  activities  of banks in  connection  with the provision of support
services to their  customers,  the Fund might be required to alter materially or
cause the Fund to discontinue its  arrangements  with banks generally and change
its  method  of  operations  with  respect  to  the  Select  Shares.  It is  not
anticipated,  however,  that any change in the Fund's method of operations would
affect  its net asset  value per  share or  result  in a  financial  loss to any
customer.

DIVIDENDS AND DISTRIBUTIONS
- --------------------------------------------------------------------------------

     The Fund will distribute substantially all of the net investment income and
net  realized  capital  gains,  if  any,  of the  Portfolio  to the  Portfolio's
shareholders.  All  distributions  are reinvested in the form of additional full
and fractional Shares of the Select Class unless a shareholder elects otherwise.

     The net investment income (not including any net short-term  capital gains)
earned by the Portfolio will be declared as a dividend on a daily basis and paid
monthly.  Dividends are payable to shareholders of record  immediately  prior to
the  determination of net asset value made as of the close of regular trading of
the NYSE.  Net short-term  capital  gains,  if any, will be distributed at least
annually.

TAXES
- --------------------------------------------------------------------------------

     Distributions from the Portfolio will generally be taxable to shareholders.
It is expected  that all, or  substantially  all,  of these  distributions  will
consist  of  ordinary  income.  You  will be  subject  to  income  tax on  these
distributions  regardless  whether  they  are  paid  in cash  or  reinvested  in
additional  shares.  The one major  exception  to these tax  principles  is that
distributions on shares held in an IRA (or other tax-qualified plan) will not be
currently taxable.

     The  foregoing  is only a summary of certain tax  considerations  under the
current law,  which may be subject to change in the future.  You should  consult
your tax adviser for further information regarding federal,  state, local and/or
foreign tax consequences relevant to your specific situation.

                                       12
<PAGE>

DESCRIPTION OF SHARES
- --------------------------------------------------------------------------------

     The Fund has  authorized  capital of thirty billion shares of Common Stock,
$.001 par  value  per  share,  of which  18.326  billion  shares  are  currently
classified  into 97  different  classes  of Common  Stock (see  "Description  of
Shares" in the Statement of Additional Information).

     The Fund offers multiple classes of shares in the Money Market Portfolio to
expand its  marketing  alternatives  and to  broaden  its range of  services  to
different  investors.  The expenses of the various  classes within the Portfolio
vary  based  upon  the  services  provided,  which  may  affect  performance.  A
salesperson or any other person entitled to receive  compensation  for servicing
Fund shares may receive different compensation with respect to different classes
in the  Portfolio.  An investor  may contact the Fund's  Distributor  by calling
1-800-888-9723 to request more information concerning other classes available.

     THIS  PROSPECTUS AND THE STATEMENT OF ADDITIONAL  INFORMATION  INCORPORATED
HEREIN RELATE  EXCLUSIVELY TO THE SELECT CLASS OF THE MONEY MARKET PORTFOLIO AND
DESCRIBE ONLY THE INVESTMENT OBJECTIVE AND POLICIES,  OPERATIONS,  CONTRACTS AND
OTHER MATTERS RELATING TO THE SELECT SHARES OF THE PORTFOLIO.

     Each  share that  represents  an  interest  in the  Portfolio  has an equal
proportionate  interest in the assets belonging to the Portfolio with each other
share that  represents  an interest in the  Portfolio,  even where a share has a
different class  designation than another share  representing an interest in the
Portfolio.  Shares of the Fund do not have preemptive or conversion rights. When
issued for payment as described in this  Prospectus,  shares of the Fund will be
fully paid and non-assessable.

     The Fund currently does not intend to hold annual  meetings of shareholders
except  as  required  by the 1940 Act or other  applicable  law.  The law  under
certain circumstances provides shareholders with the right to call for a meeting
of shareholders to consider the removal of one or more directors.  To the extent
required  by law,  the Fund will  assist in  shareholder  communication  in such
matters.

     Holders of shares of the  Portfolio  will vote in the  aggregate and not by
class  on  all  matters,  except  where  otherwise  required  by  law.  Further,
shareholders of all investment portfolios of the Fund will vote in the aggregate
and not by portfolio  except as  otherwise  required by law or when the Board of
Directors determines that the matter to be voted upon affects only the interests
of the shareholders of a particular investment portfolio.  (See the Statement of
Additional Information under "Additional Information Concerning Fund Shares" for
examples of when the 1940 Act  requires  voting by  investment  portfolio  or by
class.)  Shareholders  of the Fund are  entitled to one vote for each full share
held  (irrespective  of class or portfolio) and fractional  votes for fractional
shares held. Voting rights are not cumulative and,  accordingly,  the holders of
more than 50% of the aggregate  shares of Common Stock of the Fund may elect all
of the directors.

     As of November 16, 1998, to the Fund's knowledge,  no person held of record
or  beneficially  25% or more of the  outstanding  shares of all  classes of the
Fund.

OTHER INFORMATION
- --------------------------------------------------------------------------------

REPORTS AND INQUIRIES

     Shareholders  will receive  unaudited  semi-annual  reports  describing the
Fund's  investment   operations  and  annual  financial  statements  audited  by
independent  accountants.  Shareholders  may  direct  inquiries  to  the  Fund's
transfer  agent,   400  Bellevue   Parkway,   Wilmington,   DE  19809,  or  call
1-800-430-9618. 

                                       13
<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>

NO  PERSON  HAS  BEEN  AUTHORIZED  TO  GIVE  ANY  INFORMATION  OR  TO  MAKE  ANY
REPRESENTATIONS  NOT CONTAINED IN THIS PROSPECTUS OR IN THE FUND'S  STATEMENT OF
ADDITIONAL INFORMATION  INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE
OFFERING MADE BY THIS  PROSPECTUS  AND, IF GIVEN OR MADE,  SUCH  INFORMATION  OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE FUND OR
ITS DISTRIBUTOR.  THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY THE FUND OR
BY THE  DISTRIBUTOR IN ANY  JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY
BE MADE.


                     ---------------------------------------
                                    CONTENTS
                                                                            PAGE
Introduction ..............................................................   2
Investment Objective and Policies .........................................   3
Year 2000 .................................................................   6
Investment Limitations ....................................................   6
Purchase and Redemptions of Shares ........................................   8
Net Asset Value ...........................................................   9
Management ................................................................  10
Dividends and Distributions ...............................................  12
Taxes .....................................................................  12
Description of Shares .....................................................  13
Other Information .........................................................  13
                                                             
INVESTMENT ADVISER
BlackRock Institutional Management Corporation
Wilmington, Delaware

DISTRIBUTOR
Provident Distributors, Inc.
West Conshohocken, Pennsylvania

CUSTODIAN
PFPC Trust Company
Wilmington, Delaware

ADMINISTRATOR AND TRANSFER AGENT
PFPC Inc.
Wilmington, Delaware

COUNSEL
Drinker Biddle & Reath LLP
Philadelphia, Pennsylvania

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers LLP
Philadelphia, Pennsylvania

<PAGE>
The Sansom Street Family
The RBB Fund, Inc.
PROVIDED THROUGH ROBERTSON STEPHENS

December 29, 1998


FUNDProspectus



<PAGE>




NO  PERSON  HAS  BEEN  AUTHORIZED  TO  GIVE  ANY  INFORMATION  OR  TO  MAKE  ANY
REPRESENTATIONS  NOT CONTAINED IN THIS PROSPECTUS OR IN THE FUND'S  STATEMENT OF
ADDITIONAL INFORMATION  INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE
OFFERING MADE BY THIS  PROSPECTUS  AND, IF GIVEN OR MADE,  SUCH  INFORMATION  OR
REPRESENTATIONS  MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THEFUND OR
ITS DISTRIBUTOR.  THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY THE FUND OR
BY THE  DISTRIBUTOR IN ANY  JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY
BE MADE.

                                ----------------
                                    CONTENTS
                                                                            PAGE
                                                                            ----
Introduction ...........................................................      2
Financial Highlights ...................................................      3
Investment Objectives and Policies .....................................      5
Year 2000 ..............................................................      7
Investment Limitations .................................................      8
Purchase and Redemption of Shares ......................................      9
Net Asset Value ........................................................     12
Distribution of Shares .................................................     12
Shareholder Servicing ..................................................     13
Management .............................................................     13
Dividends and Distributions ............................................     16
Taxes ..................................................................     16
Description of Shares ..................................................     16
Other Information ......................................................     17
                                                                        
                               INVESTMENT ADVISER
                 BlackRock Institutional Management Corporation
                              Wilmington, Delaware

                                   DISTRIBUTOR
                          Provident Distributors, Inc.
                         West Conshohocken, Pennsylvania

                                    CUSTODIAN
                               PFPC Trust Company
                              Wilmington, Delaware

                        ADMINISTRATOR AND TRANSFER AGENT
                                    PFPC Inc.
                              Wilmington, Delaware

                                     COUNSEL
                           Drinker Biddle & Reath LLP
                           Philadelphia, Pennsylvania

                             INDEPENDENT ACCOUNTANTS
                           PricewaterhouseCoopers LLP
                           Philadelphia, Pennsylvania

<PAGE>





                            THE SANSOM STREET FAMILY
                                       OF
                               THE RBB FUND, INC.

     The Sansom Street  Family  consists of three classes of common stock of The
RBB Fund, Inc. (the "Fund"),  an open-end  management  investment  company.  The
shares of one such class are offered by this Prospectus and represent  interests
in the Fund's Money Market Portfolio.

     The  investment  objective of the Money  Market  Portfolio is to provide as
high a level of  current  interest  income  as is  consistent  with  maintaining
liquidity  and  stability of  principal.  It seeks to achieve such  objective by
investing in a  diversified  portfolio of U.S.  dollar-denominated  money market
instruments.

     SHARES OF THE FUND ARE NOT DEPOSITS OR  OBLIGATIONS  OF, OR  GUARANTEED  OR
ENDORSED BY PNC BANK, NATIONAL ASSOCIATION, PFPC TRUST COMPANY OR ANY OTHER BANK
AND  SHARES  ARE  NOT  FEDERALLY   INSURED  BY  THE  FEDERAL  DEPOSIT  INSURANCE
CORPORATION,  THE FEDERAL  RESERVE  BOARD,  OR ANY OTHER AGENCY.  INVESTMENTS IN
SHARES OF THE FUND INVOLVE  INVESTMENT  RISKS,  INCLUDING  THE POSSIBLE  LOSS OF
PRINCIPAL.  THERE  CAN BE NO  ASSURANCE  THAT  THE  PORTFOLIOS  WILL  BE ABLE TO
MAINTAIN A STABLE NET ASSET VALUE OF $1.00 PER SHARE.

     BlackRock Institutional Management Corporation serves as investment adviser
for these  Portfolios  and PFPC Trust Company  serves as custodian for the Fund.
PFPC Inc. serves as administrator and as transfer and dividend  disbursing agent
for the Fund. Provident Distributors, Inc. acts as distributor for the Fund.

     Sansom  Street  Shares  are sold by the  Fund's  distributor  to  customers
maintaining  accounts with banks  affiliated  with PNC Bank Corp. (the "Banks").
Sansom Street Shares will be sold to customers,  including individuals,  trusts,
partnerships and corporations,  who maintain accounts (such as custody, trust or
escrow  accounts) with the Banks, and who have authorized the Banks to invest in
the Fund. Shares are sold and redeemed without any purchase or redemption charge
imposed by the Fund,  although the Banks may receive  compensation from the Fund
and charge their customer  accounts for services provided in connection with the
purchase or redemption of shares.  See  "Shareholder  Servicing."  Sansom Street
Shares are also sold through  dealers that have entered into a dealer  agreement
with the Fund's Distributor.

     This Prospectus  contains concise  information that a prospective  investor
needs to know before investing. Please keep it for future reference. A Statement
of  Additional  Information,  dated  December 29, 1998,  has been filed with the
Securities  and Exchange  Commission  and is  incorporated  by reference in this
Prospectus.  It may be  obtained  upon  request  free of charge from the Fund by
calling (800) 430-9618.  The Prospectus and Statement of Additional  Information
are also available for reference, along with other related materials, on the SEC
Internet Website (http://www.sec.gov).

- --------------------------------------------------------------------------------
THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THIS
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------

PROSPECTUS                                                     December 29, 1998

<PAGE>

INTRODUCTION
- --------------------------------------------------------------------------------
     The  RBB  Fund,  Inc.  is  an  open-end   management   investment   company
incorporated  under the laws of the State of Maryland on February 29, 1988.  The
Fund is  currently  operating  or  proposing  to  operate  seventeen  investment
portfolios.  Shares  ("Sansom  Street  Shares" or "Shares") of the Sansom Street
Class ("Sansom  Street Class" or "Class") of the Fund offered by this Prospectus
represent  interests  in the Fund's Money Market  Portfolio  (the "Money  Market
Portfolio" or the "Portfolio").

     The investment  objective of the Portfolio is to provide as high a level of
current  interest  income  as  is  consistent  with  maintaining  liquidity  and
stability of  principal.  It seeks to achieve  such  objective by investing in a
diversified portfolio of U.S.  dollar-denominated money market instruments which
meet certain  ratings  criteria  and which  present  minimal  credit  risks.  In
pursuing its investment objective, the Money Market Portfolio invests in a broad
range of government,  bank and commercial  obligations  that may be available in
the money markets.

     The  Portfolio  seeks to  maintain  a net asset  value of $1.00 per  share;
however, there can be no assurance that it will be able to maintain a stable net
asset value of $1.00 per share.

     The Portfolio's  investment adviser is BlackRock  Institutional  Management
Corporation  ("BIMC").  PFPC Trust  Company  serves as custodian to the Fund and
PFPC Inc. ("PFPC") serves as administrator and transfer and dividend  disbursing
agent to the Fund.  Provident  Distributors,  Inc. (the  "Distributor")  acts as
distributor of the Fund's shares.

     An investment in the Portfolio is subject to certain risks, as set forth in
detail under "Investment Objectives and Policies." The Portfolio,  to the extent
set  forth  under  "Investment  Objectives  and  Policies,"  may  engage  in the
following  investment  practices:  the use of repurchase  agreements and reverse
repurchase agreements,  the purchase of asset-backed securities, the purchase of
securities on a  "when-issued"  or "forward  commitment  basis," the purchase of
stand-by  commitments and the lending of securities.  All of these  transactions
involve  certain special risks,  as set forth under  "Investment  Objectives and
Policies."

     For detailed information of how to purchase or redeem Sansom Street Shares,
please refer to the section of this Prospectus entitled "Purchase and Redemption
of Shares."

FEE TABLE

     The Fee Table  below  contains a summary of the annual  operating  expenses
incurred by the Sansom  Street  Class of the Money  Market  Portfolio  after fee
waivers and expense  reimbursements for the fiscal year ended August 31, 1998 as
a percentage  of average  daily net assets.  An example  based on the summary is
also shown. 

ANNUAL FUND OPERATING EXPENSES (SANSOM STREET CLASS)
     AS A PERCENTAGE OF AVERAGE DAILY NET ASSETS

                                                                  MONEY MARKET
                                                                    PORTFOLIO
                                                                  ------------
Management fees (after waivers)(1)                                    .24%
12b-1 fees(1)                                                         .05
Other Expenses                                                        .20
                                                                      ---
Total Fund Operating Expenses (Sansom Street Class)
   (after waivers)(1)                                                 .49%
                                                                      ===

(1) Management  Fees and 12b-1 Fees are each  based on average  daily net assets
    and are  calculated  daily and paid  monthly.  Before  waivers for the Money
    Market  Portfolio,  Management  Fees would be .37% and Total Fund  Operating
    Expenses would be .62%.

                                       2

<PAGE>

EXAMPLE

     An  investor  would  pay the  following  expenses  on a $1,000  investment,
assuming (1) 5% annual return and (2) redemption at the end of each time period:

                                     1 YEAR     3 YEARS     5 YEARS     10 YEARS
                                     ------     -------     -------     --------
Money Market Portfolio* ...........     $5       $16          $27         $62
* Other classes of this Portfolio are sold with different fees and expenses.

     The Example in the Fee Table assumes that all  dividends and  distributions
are  reinvested  and  that the  amounts  listed  under  "Annual  Fund  Operating
Expenses"  remain  the  same in the  years  shown.  THE  EXAMPLE  SHOULD  NOT BE
CONSIDERED A  REPRESENTATION  OF PAST OR FUTURE EXPENSES AND ACTUAL EXPENSES MAY
BE GREATER OR LESS THAN THOSE SHOWN.

     The Fee Table is  designed  to  assist an  investor  in  understanding  the
various  costs and expenses  that an investor in the Sansom  Street Class of the
Fund will bear directly or indirectly.  (For more complete  descriptions  of the
various costs and expenses, see "Management--Investment  Adviser," "Distribution
of Shares" and  "Shareholder  Servicing"  below.)  Expense  figures are based on
actual costs and fees incurred by the Class.  The Fee Table reflects a voluntary
waiver of Management Fees for the Portfolio.  However, there can be no assurance
that any  future  waivers  of  Management  Fees will not vary  from the  figures
reflected in the Fee Table.  In addition,  the  investment  adviser is currently
voluntarily assuming additional expenses of the Class. There can be no assurance
that the investment adviser will continue to assume such expenses. Assumption of
additional  expenses  will have the  effect of  lowering a  Portfolio's  overall
expense ratio and increasing its yield to investors.

     From time to time the Portfolio advertises its "total return,"  "yield" and
"effective  yield."  TOTAL  RETURN  AND YIELD  FIGURES  ARE BASED ON  HISTORICAL
EARNINGS AND ARE NOT INTENDED TO INDICATE FUTURE PERFORMANCE. The "yield" of the
Portfolio  refers to the income generated by an investment in the Portfolio over
a seven-day  period  (which period shall be stated in the  advertisement).  This
income is then  "annualized."  That is,  the amount of income  generated  by the
investment  during that week is assumed to be generated each week over a 52-week
period and is shown as a percentage of the investment.  The "effective yield" is
calculated similarly but, when annualized, the income earned by an investment in
the  Portfolio  is assumed  to be  reinvested.  The  "effective  yield"  will be
slightly  higher  than the  "yield"  because of the  compounding  effect of this
assumed reinvestment.

     The total  return and yield of any  investment  is  generally a function of
portfolio  quality and  maturity,  type of  investment,  operating  expenses and
market  conditions.  The total  return and yield on Shares of the Sansom  Street
Class will fluctuate and is not  necessarily  representative  of future results.
Any fees charged by the Banks or  broker-dealers  directly to their customers in
connection  with  investments  in the  Portfolio  are not reflected in the total
return and yields on the  Portfolio's  shares,  and such fees, if charged,  will
reduce the actual return received by customers on their  investments.  The total
return and yield on Shares of the  Sansom  Street  Class may  differ  from total
return  and yields on shares of other  classes  of the Fund that also  represent
interests in the same Portfolio  depending on the allocation of expenses to each
of the classes of that Portfolio.

FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
     The table below sets forth certain  information  concerning  the investment
results of the Sansom Street Class for the periods indicated. The financial data
included in this table for each of the  periods  ended  August 31, 1994  through
August 31, 1998 are part of the Fund's  financial  statements for the Portfolio,
which are incorporated by reference into the Statement of Additional Information
and have been audited by PricewaterhouseCoopers LLP  ("PricewaterhouseCoopers"),
the Fund's  independent  accountants.  The financial data for such Portfolio for
the periods  ended  August 31,  1989,  1990,  1991,  1992 and 1993 are a part of
previous financial statements audited by  PricewaterhouseCoopers.  The financial
data  included in this table should be read in  conjunction  with the  financial
statement  and  related  notes.  Further  information  about  the  Portfolio  is
available in the Fund's  Annual  Report to  Shareholders.  Both the Statement of
Additional  Information  and the Annual Report to  Shareholders  may be obtained
from the Fund free of charge by calling the  telephone  number on page 1 of this
Prospectus.

                                       3

<PAGE>

SANSOM STREET CLASS

                               THE RBB FUND, INC.
FINANCIAL HIGHLIGHTS (c)
     (FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

<TABLE>
<CAPTION>
                                                                    MONEY MARKET PORTFOLIO                               
                                -----------------------------------------------------------------------------------------
                                                                                                                         
                                                                                                                         
                                  FOR THE      FOR THE     FOR THE      FOR THE      FOR THE      FOR THE      FOR THE   
                                YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED 
                                AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31, 
                                   1998         1997         1996         1995         1994         1993         1992    
                                ----------   ----------   ----------   ----------   ----------   ----------   ---------- 
<S>                              <C>          <C>          <C>          <C>          <C>          <C>          <C>       
Net asset value,
   beginning of period ........  $   1.00     $    1.00    $    1.00    $   1.00     $   1.00     $   1.00     $   1.00  
                                 --------     ---------    ---------    --------     --------     --------     --------  
Income from investment
   operations:
   Net investment income ......     .0520        0.0510       0.0518      0.0543       0.0334       0.0304       0.0435  
   Net gains on securities
     (both realized
     and unrealized) ..........        --            --           --          --           --           --       0.0007  
                                 --------     ---------    ---------    --------     --------     --------     --------  
       Total from
         investment
         operations ...........     .0520        0.0510       0.0518      0.0543       0.0334       0.0304       0.0442  
                                 --------     ---------    ---------    --------     --------     --------     --------  
Less distributions
   Dividends (from net
     investment income) .......    (.0520)      (0.0510)     (0.0518)    (0.0543)     (0.0334)     (0.0304)     (0.0435) 
   Distributions (from
     capital gains) ...........        --            --           --          --           --           --      (0.0007) 
                                 --------     ---------    ---------    --------     --------     --------     --------  
       Total distributions ....    (.0520)      (0.0510)     (0.0518)    (0.0543)     (0.0334)     (0.0304)     (0.0442) 
                                 --------     ---------    ---------    --------     --------     --------     --------  
Net asset value,
   end of period ..............  $   1.00     $    1.00    $    1.00    $   1.00     $   1.00     $   1.00     $   1.00  
                                 ========     =========    =========    ========     ========     ========     ========  

Total return ..................     5.34%         5.22%        5.30%       5.57%        3.39%        3.08%        4.51%  
Ratios/Supplemental Data
   Net Assets, end of
     period (000) .............  $684,066     $ 570,018    $ 524,359    $441,614     $373,745     $190,794     $228,079  
   Ratios of expenses to
     average net assets .......    .49%(a)       .49%(a)      .48%(a)     .39%(a)      .39%(a)      .34%(a)      .35%(a) 
   Ratios of net investment
     income to average
     net assets ...............     5.20%         5.10%        5.18%       5.43%        3.34%        3.04%        4.35%  
</TABLE>

<TABLE>
<CAPTION>
                                            MONEY MARKET PORTFOLIO
                                --------------------------------------------
                                                            FOR THE PERIOD
                                                          SEPTEMBER 30, 1988
                                 FOR THE      FOR THE       (COMMENCEMENT
                                YEAR ENDED   YEAR ENDED    OF OPERATIONS) TO
                                AUGUST 31,   AUGUST 31,       AUGUST 31,
                                   1991         1990             1989
                                ----------   ----------   ------------------
<S>                              <C>          <C>              <C>
Net asset value,
   beginning of period ........  $   1.00     $   1.00         $   1.00
                                 --------     --------         --------
Income from investment
   operations:
   Net investment income ......    0.0684       0.0810           0.0818
   Net gains on securities
     (both realized
     and unrealized) ..........        --           --               --
                                 --------     --------         --------
       Total from
         investment
         operations ...........    0.0684       0.0810           0.0818
                                 --------     --------         --------
Less distributions
   Dividends (from net
     investment income) .......   (0.0684)     (0.0810)         (0.0818)
   Distributions (from
     capital gains) ...........        --           --               --
                                 --------     --------         --------
       Total distributions ....   (0.0684)     (0.0810)         (0.0818)
                                 --------     --------         --------
Net asset value,
   end of period ..............  $   1.00     $   1.00         $   1.00
                                 ========     ========         ========

Total return ..................     7.06%        8.40%          9.25%(b)
Ratios/Supplemental Data
   Net Assets, end of
     period (000) .............  $138,418     $106,743         $ 79,656
   Ratios of expenses to
     average net assets .......    .37%(a)      .47%(a)       .50%(a)(b)
   Ratios of net investment
     income to average
     net assets ...............     6.84%        8.10%          9.04%(b)

<FN>
(a) Without the waiver of advisory fees and without the reimbursement of certain
    operating  expenses,  the ratios of  expenses  to average net assets for the
    Money Market  Portfolio would have been .62%,  .64%, .65%, .59%, .60%, .60%,
    .61%, .61% and .73% for the years ended August 31, 1998,  1997,  1996, 1995,
    1994, 1993, 1992, 1991, and 1990, respectively,  and .83% annualized for the
    period ended August 31, 1989.

(b) Annualized.

(c) Financial  Highlights  relate  solely to the Sansom  Street  Class of Shares
    within the portfolio.
</FN>
</TABLE>

                                       4

<PAGE>

INVESTMENT OBJECTIVES AND POLICIES
- --------------------------------------------------------------------------------

                             MONEY MARKET PORTFOLIO

     The Money Market Portfolio's  investment  objective is to provide as high a
level of current interest income as is consistent with maintaining liquidity and
stability of principal. Portfolio obligations held by the Money Market Portfolio
have remaining  maturities of 397 days or less (exclusive of securities  subject
to  repurchase  agreements).  In pursuing its  investment  objective,  the Money
Market Portfolio invests in a diversified  portfolio of U.S.  dollar-denominated
instruments,  such as government,  bank and commercial obligations,  that may be
available  in the  money  markets  ("Money  Market  Instruments")  and that meet
certain  ratings  criteria and present  minimal credit risks to the Money Market
Portfolio.  See "Eligible Securities." There is no assurance that the investment
objective  of  the  Portfolio  will  be  achieved.  The  following  descriptions
illustrate  the types of Money  Market  Instruments  in which  the Money  Market
Portfolio invests.

     BANK OBLIGATIONS.  The Portfolio may purchase obligations of issuers in the
banking  industry,  such as short-term  obligations  of bank holding  companies,
certificates of deposit, bankers' acceptances and time deposits,  including U.S.
dollar-denominated  instruments  issued or  supported  by the credit of U.S.  or
foreign  banks  or  savings  institutions  having  total  assets  at the time of
purchase in excess of $1 billion.  The  Portfolio  may invest  substantially  in
obligations  of  foreign  banks or  foreign  branches  of U.S.  banks  where the
investment  adviser deems the instrument to present  minimal credit risks.  Such
investments  may  nevertheless  entail  risks in  addition  to those of domestic
issuers,   including  higher   transaction   costs,   less  complete   financial
information,  less stringent regulatory  requirements and less market liquidity.
The Portfolio may also make interest-bearing  savings deposits in commercial and
savings banks in amounts not in excess of 5% of its total assets.

     COMMERCIAL PAPER. The Portfolio may purchase commercial paper (i) rated (at
the time of  purchase)  in the two  highest  rating  categories  of at least two
nationally recognized statistical rating organizations  ("Rating  Organization")
or, by the only Rating  Organization;  or (ii) issued by issuers (or, in certain
cases  guaranteed by persons) with  short-term  debt having such ratings.  These
rating  categories  are described in the Appendix to the Statement of Additional
Information.  The Portfolio may also purchase unrated  commercial paper provided
that such paper is  determined to be of  comparable  quality by the  Portfolio's
investment adviser in accordance with guidelines approved by the Fund's Board of
Directors.

     Commercial paper purchased by the Portfolio may include  instruments issued
by foreign issuers,  such as Canadian  Commercial  Paper ("CCP"),  which is U.S.
dollar-denominated  commercial  paper  issued  by a  Canadian  corporation  or a
Canadian  counterpart  of a U.S.  corporation,  and in Europaper,  which is U.S.
dollar-denominated commercial paper of a foreign issuer, subject to the criteria
stated above for other commercial paper issuers.

     VARIABLE RATE DEMAND NOTES. The Portfolio may purchase variable rate demand
notes, which are unsecured  instruments that permit the indebtedness  thereunder
to vary and provide for periodic  adjustment in the interest rate.  Although the
notes are not normally traded and there may be no active secondary market in the
notes, the Portfolio will be able (at any time or during  specified  periods not
exceeding 13 months,  depending upon the note involved) to demand payment of the
principal  of a note.  The  notes  are not  typically  rated  by  credit  rating
agencies,  but  issuers of  variable  rate  demand  notes must  satisfy the same
criteria as set forth above for issuers of commercial  paper.  If an issuer of a
variable  rate demand note  defaulted on its payment  obligation,  the Portfolio
might be unable to  dispose  of the note  because  of the  absence  of an active
secondary market.  For this or other reasons,  the Portfolio might suffer a loss
to the extent of the  default.  The  Portfolio  invests in variable  rate demand
notes only when the  Portfolio's  investment  adviser  deems the  investment  to
involve  minimal credit risk. The Portfolio's  investment  adviser also monitors
the continuing  creditworthiness  of issuers of such notes to determine  whether
the Portfolio should continue to hold such notes.

     REPURCHASE AGREEMENTS.  The Portfolio may agree to purchase securities from
financial  institutions  subject to the seller's agreement to repurchase them at
an agreed-upon  time and price  ("repurchase  agreements").  The securities held
subject to a  repurchase  agreement  may have  stated  maturities  exceeding  13
months, provided the repurchase agreement

                                       5

<PAGE>

itself  matures in less than 13 months.  Default by or  bankruptcy of the seller
would, however,  expose the Portfolio to possible loss because of adverse market
action  or  delays  in  connection   with  the  disposition  of  the  underlying
obligations.

     U.S. GOVERNMENT OBLIGATIONS.  The Portfolio may purchase obligations issued
or  guaranteed  by the U.S.  Government  or its agencies and  instrumentalities.
Obligations of certain agencies and instrumentalities of the U.S. Government are
backed by the full faith and credit of the United  States.  Others are backed by
the right of the issuer to borrow  from the U.S.  Treasury or are backed only by
the credit of the agency or instrumentality issuing the obligation.

     ASSET-BACKED   SECURITIES.   The  Portfolio  may  invest  in   asset-backed
securities which are backed by mortgages,  installment  sales contracts,  credit
card  receivables  or  other  assets  and  collateralized  mortgage  obligations
("CMOs") issued or guaranteed by U.S. Government agencies and  instrumentalities
or issued by private companies.  Asset-backed securities also include adjustable
rate securities.  The estimated life of an asset-backed security varies with the
prepayment experience with respect to the underlying debt instruments.  For this
and other reasons, an asset-backed  security's stated maturity may be shortened,
and the  security's  total return may be difficult  to predict  precisely.  Such
difficulties  are not expected,  however,  to have a  significant  effect on the
Portfolio since the remaining  maturity of any  asset-backed  security  acquired
will be 13 months or less.  Asset-backed  securities  are considered an industry
for industry concentration purposes. See "Investment Limitations." In periods of
falling  interest  rates,  the rate of mortgage  prepayments  tends to increase.
During these periods the  reinvestment of proceeds by a portfolio will generally
be at lower rates than the rates on the prepaid obligations.

     REVERSE  REPURCHASE  AGREEMENTS.  The  Portfolio  may  enter  into  reverse
repurchase agreements with respect to portfolio securities. A reverse repurchase
agreement   involves  a  sale  by  a  portfolio  of  securities  that  it  holds
concurrently  with an agreement by the portfolio to repurchase them at an agreed
upon time and price.  Reverse  repurchase  agreements  involve the risk that the
market value of the securities sold by the Portfolio may decline below the price
at which the  Portfolio is  obligated to  repurchase  them.  Reverse  repurchase
agreements are considered to be borrowings by the Portfolio under the Investment
Company Act of 1940 (the "1940 Act").

     MUNICIPAL  OBLIGATIONS.   In  addition,  the  Portfolio  may,  when  deemed
appropriate by its  investment  adviser in light of the  Portfolio's  investment
objective,  invest  without  limitation  in high quality,  short-term  Municipal
Obligations  issued by state and local  governmental  issuers,  the  interest on
which may be taxable or tax-exempt  for federal  income tax  purposes,  provided
that such  obligations  carry  yields that are  competitive  with those of other
types of Money Market  Instruments  of comparable  quality.  For a more complete
discussion of Municipal  Obligations,  see  Statement of Additional  Information
under "Investment Objectives and Policies."

     GUARANTEED  INVESTMENT  CONTRACTS.  The Portfolio may make  investments  in
obligations,  such  as  guaranteed  investment  contracts  and  similar  funding
agreements  (collectively,  "GICs"),  issued  by  highly  rated  U.S.  insurance
companies.  A GIC is a general  obligation of the issuing  insurance company and
not a separate account. The Portfolio's  investments in GICs are not expected to
exceed 5% of its total  assets at the time of  purchase  absent  unusual  market
conditions.   GIC  investments  are  subject  to  the  Fund's  policy  regarding
investment in illiquid securities.

     STAND-BY COMMITMENTS. The Portfolio may acquire "stand-by commitments" with
respect  to  Municipal  Obligations  held in its  portfolio.  Under  a  stand-by
commitment, a dealer would agree to purchase at the Portfolio's option specified
Municipal  Obligations  at a  specified  price.  The  acquisition  of a stand-by
commitment may increase the cost, and thereby reduce the yield, of the Municipal
Obligation to which such commitment relates. The Portfolio will acquire stand-by
commitments  solely to  facilitate  portfolio  liquidity  and does not intend to
exercise its rights thereunder for trading purposes.

     WHEN-ISSUED SECURITIES.  The Portfolio may purchase portfolio securities on
a  "when-issued"  basis.  When-issued  securities are  securities  purchased for
delivery  beyond the normal  settlement  date at a stated  price and yield.  The
Portfolio will generally not pay for such  securities or start earning  interest
on them until they are received. Securities purchased on a when-issued basis are
recorded as an asset at the time the commitment is entered into and are sub-

                                       6

<PAGE>

ject to changes in value  prior to  delivery  based upon  changes in the general
level of interest  rates.  The Portfolio  expects that  commitments  to purchase
when-issued  securities  will not  exceed  25% of the value of its total  assets
absent  unusual  market  conditions.  The Portfolio  does not intend to purchase
when-issued  securities for speculative  purposes but only in furtherance of its
investment objective.

     ELIGIBLE SECURITIES. The Portfolio will only purchase "eligible securities"
that present  minimal credit risks as determined by the  Portfolio's  investment
adviser  pursuant  to  guidelines  adopted by the Board of  Directors.  Eligible
securities  generally include:  (1) U.S. Government  securities,  (2) securities
that are rated at the time of purchase in the two highest  rating  categories by
at least two Rating Organizations  ("Rating  Organizations")  (e.g.,  commercial
paper rated "A-1" or "A-2" by Standard & Poor's Ratings Services  ("S&P")),  (3)
securities  that  are  rated  at  the  time  of  purchase  by  the  only  Rating
Organization rating the security in one of its two highest rating categories for
such  securities  (4)  securities  issued  by  issuers  (or,  in  certain  cases
guaranteed  by  persons)  with  short-term  debt having  such  ratings,  and (5)
securities  that are not  rated and are  issued by an issuer  that does not have
comparable  obligations rated by a Rating Organization  ("Unrated  Securities"),
provided that such  securities  are  determined  to be of comparable  quality to
eligible  rated  securities.   For  a  more  complete  description  of  eligible
securities,  see  "Investment  Objectives  and  Policies"  in the  Statement  of
Additional Information.

     ILLIQUID SECURITIES. The Portfolio will not invest more than 10% of its net
assets in illiquid  securities,  including  repurchase  agreements  which have a
maturity of longer than seven days,  time deposits with  maturities in excess of
seven days,  variable  rate demand notes with demand  periods in excess of seven
days unless the Portfolio's  investment  adviser  determines that such notes are
readily  marketable  and could be sold  promptly at the prices at which they are
valued, GICs, and other securities that are illiquid by virtue of the absence of
a readily  available  market or legal or  contractual  restrictions  on  resale.
Repurchase  agreements  subject to demand are deemed to have a maturity equal to
the notice period.  Securities  that have legal or contractual  restrictions  on
resale but have a readily  available market are not deemed illiquid for purposes
of  this  limitation.  The  Portfolio's  investment  adviser  will  monitor  the
liquidity of such  restricted  securities  under the supervision of the Board of
Directors.  See "Investment  Objectives and Policies -- Illiquid  Securities" in
the Statement of Additional Information.

YEAR 2000
- --------------------------------------------------------------------------------
     Like  other  mutual  funds,   financial  and  business   organizations  and
individuals  around  the  world,  the Fund could be  adversely  affected  if the
computer systems used by the Adviser and the Fund's other service providers,  or
persons with whom they deal, do not properly process and calculate  date-related
information  and data  from and after  January  1,  2000.  This  possibility  is
commonly known as the "Year 2000 Problem." The Year 2000 Problem could also hurt
companies whose securities the Fund holds or securities markets  generally.  The
Fund has been advised by the Adviser,  the Administrators and the Custodian that
they are actively  taking steps to address the Year 2000 Problem with respect to
the computer  systems  that they use and to obtain  assurances  that  comparable
steps are being taken by the Fund's other major service  providers.  While there
can be no  assurance  that  the  Fund's  service  providers  will be  Year  2000
compliant,  the Fund's service providers expect that their plans to be compliant
will be achieved.

                                       7

<PAGE>

INVESTMENT LIMITATIONS
- --------------------------------------------------------------------------------
     The Portfolio's  investment  objective and policies  described above may be
changed by the Fund's  Board of  Directors  without  shareholder  approval.  The
Portfolio may not, however,  change the investment  limitations summarized below
without  such a vote  of  shareholders.  (A  more  detailed  description  of the
following  investment  limitations,  together with other investment  limitations
that  cannot be changed  without a vote of  shareholders,  is  contained  in the
Statement of Additional Information under "Investment Objectives and Policies.")

     The Money Market Portfolio may not:

         1. Purchase any securities other than Money Market Instruments, some of
     which may be subject to repurchase  agreements,  but the Portfolio may make
     interest-bearing  savings  deposits  in amounts  not in excess of 5% of the
     value of the Portfolio's assets and may make time deposits.

         2. Borrow money,  except from banks for  temporary  purposes and except
     for reverse repurchase agreements, and then in amounts not in excess of 10%
     of the value of a  Portfolio's  assets at the time of such  borrowing,  and
     only if after such  borrowing  there is asset coverage of at least 300% for
     all borrowings of the Portfolio; or mortgage,  pledge or hypothecate any of
     its assets except in connection  with any such borrowing and in amounts not
     in excess of 10% of the value of the Portfolio's assets at the time of such
     borrowing;  or purchase portfolio securities while borrowings are in excess
     of 5% of the Portfolio's net assets.  (This borrowing  provision is not for
     investment leverage, but solely to facilitate management of the Portfolio's
     securities by enabling the Portfolio to meet redemption  requests where the
     liquidation  of portfolio  securities  is deemed to be  disadvantageous  or
     inconvenient.)

         3. Purchase any securities  which would cause, at the time of purchase,
     less  than 25% of the  value of the total  assets  of the  Portfolio  to be
     invested  in the  obligations  of issuers in the  banking  industry,  or in
     obligations,  such as repurchase  agreements,  secured by such  obligations
     (unless the Portfolio is in a temporary  defensive position) or which would
     cause,  at the time of  purchase,  more  than 25% of the value of its total
     assets to be invested in the obligations of issuers in any other industry.

         4. Purchase securities of any one issuer,  other than securities issued
     or guaranteed by the U.S. Government or its agencies and instrumentalities,
     if  immediately  after and as a result of such purchase more than 5% of the
     value of its total  assets  would be  invested  in the  securities  of such
     issuer,  or more  than 10% of the  outstanding  voting  securities  of such
     issuer would be owned by the Portfolio,  except that up to 25% of the value
     of the Portfolio's  total assets may be invested  without regard to such 5%
     limitation.

     So long as it values its portfolio securities on the basis of the amortized
cost method of valuation pursuant to Rule 2a-7 under the 1940 Act, the Portfolio
will meet the  following  limitations  on its  investments  in  addition  to the
fundamental  investment  limitations  described above.  These limitations may be
changed without a shareholder vote.

         1. The Portfolio  will limit its purchases of the securities of any one
     issuer,  other than  issuers of U.S.  Government  securities,  to 5% of its
     total  assets,  except  that the  Portfolio  may invest more than 5% of its
     total assets in First Tier  Securities  of one issuer for a period of up to
     three Business Days (as defined  below).  "First Tier  Securities"  include
     eligible securities that (i) if rated by more than one Rating Organization,
     are rated (at the time of purchase) by two or more Rating  Organizations in
     the highest rating category for such securities,  (ii) if rated by only one
     Rating  Organization,  are rated by such Rating Organization in its highest
     rating category for such  securities,  (iii) have no short-term  rating and
     are   comparable  in  priority  and  security  to  a  class  of  short-term
     obligations  of the  issuer of such  securities  that  have  been  rated in
     accordance with (i) or (ii) above, or (iv) are Unrated  Securities that are
     determined to be of  comparable  quality to such  securities.  Purchases of
     First Tier Securities that come within  categories (ii) and (iv) above will
     be approved or ratified by the Board of Directors.

                                       8

<PAGE>


         2. The Portfolio  will limit its  purchases of Second Tier  Securities,
     which are eligible  securities other than First Tier  Securities,  to 5% of
     its total assets.

         3.  The  Portfolio  will limit its  purchases of Second Tier Securities
     of one issuer to the greater of 1% of its total assets or $1 million.

PURCHASE AND REDEMPTION OF SHARES
- --------------------------------------------------------------------------------

                               PURCHASE PROCEDURES

     Sansom Street Shares are sold without a sales load on a continuous basis by
the Fund's Distributor.  Purchase of Shares may be made through the Banks acting
on behalf of their customers,  including individuals,  trusts,  partnerships and
corporations who maintain  accounts (such as custody,  trust or escrow accounts)
with the  Banks  and who have  authorized  the Bank to invest in the Fund on the
customer's  behalf.  Investors may also purchase  shares through any broker that
has entered into a dealer  agreement  with the Fund's  Distributor (a "Dealer").
The minimum  initial  investment  by an investor is $1,500.  There is no minimum
subsequent investment.

     Purchases of Shares may be effected through the customer's  accounts at the
Banks or investor  accounts with the Dealer  through  procedures  established in
connection  with the  requirements  of accounts at the Banks or at such  Dealer.
Confirmations  of share purchases and  redemptions  will be sent to the Banks or
such Dealer.  Beneficial  ownership of Sansom  Street Shares will be recorded by
the Banks or such Dealer and  reflected  in the account  statements  provided by
such Banks or by such Dealer to investors. If you wish to purchase Sansom Street
Shares, contact your Bank or a Dealer.

     The Banks may also impose minimum customer account  requirements.  Although
the Banks do not impose a sales charge for  purchases of Sansom  Street  Shares,
depending  upon the  terms of the  particular  customer  account,  the Banks may
charge the  account  fees for  automatic  investment  and other cash  management
services.  Information  concerning these minimum account requirements,  services
and any charges will be provided by the Banks before the customer authorizes the
initial purchase of shares.  This Prospectus  should be read in conjunction with
any information received from the Banks. See "Shareholder Servicing."

     The shares of the Sansom Street Class of the  Portfolio are also  available
through Robertson Stephens,  a registered  broker-dealer that has entered into a
dealer Agreement with the Fund's  Distributor.  For  distribution  services with
respect to of shares of the Portfolio held by this firm, the Fund's  Distributor
pays  Robertson  Stephens up to .25% of the average annual daily net asset value
of such accounts.  Purchases made through this program do not require  customers
to pay a transaction fee.

     DIRECT  PURCHASES  THROUGH  A  DEALER.  An  investor  may  make an  initial
investment  by mail by  completing  and signing an  application  obtained from a
Dealer (an  "Application")  and mailing  it,  together  with a check  payable to
"Sansom Street Money  Market," to "Sansom  Street Money Market," c/o PFPC,  P.O.
Box 8950,  Wilmington,  Delaware 19899.  An Application  will be returned to the
investor  unless it contains  the name of the Dealer from whom it was  obtained.
Subsequent  purchases may be made through a Dealer or by  forwarding  payment to
the Fund's transfer agent at the foregoing address.

     The Fund reserves the right to reject any purchase order.

     All  payments  for initial  and  subsequent  investments  should be in U.S.
dollars. Purchases will be effected at the net asset value next determined after
receipt of the purchase  order in good order and Federal  Funds are available to
the Fund. Purchase orders received after its close of business are priced at the
net asset value next determined on the following  "Business Day." In those cases
in which an  investor  pays for Shares by check,  Federal  Funds will  generally
become  available two days after the check is received.  A "Business Day" is any
day that both the New York Stock

                                       9

<PAGE>

Exchange (the "NYSE") and the Federal Reserve Bank of  Philadelphia  (the "FRB")
are open. Purchase orders for Shares are accepted only on Business Days.

     Conflict of interest  restrictions may apply to an institution's receipt of
compensation  paid by the Fund in  connection  with the  investment of fiduciary
funds in Sansom Street Shares.  Institutions,  including  banks regulated by the
Comptroller  of the Currency and  investment  advisers and other money  managers
subject to the  jurisdiction  of the  Securities  and Exchange  Commission,  the
Department of Labor or state securities commissions,  are urged to consult their
legal advisers before  investing  fiduciary  funds in Sansom Street Shares.  See
"Management-Banking Laws."

                              REDEMPTION OF SHARES

     Redemption  orders  are  effected  at the net asset  value  per share  next
determined  after  receipt of the order in proper  form by the  Fund's  transfer
agent,  PFPC. It is the  responsibility of the Banks and the Dealers to transmit
promptly to PFPC a customer's  redemption  request.  In the case of shareholders
holding share  certificates,  the  certificates  must  accompany the  redemption
request. Investors may redeem all or some of their Shares in accordance with one
of the procedures described below.

     REDEMPTION  OF SHARES IN AN ACCOUNT  FOR BANK  CUSTOMERS.  A  customer  may
redeem all or part of his Sansom Street Shares in accordance  with  instructions
and  limitations  pertaining to his account at the Bank.  Redemption  orders are
effected at the net asset value per share  determined after receipt of the order
by PFPC. Payment for redemption orders received by PFPC on a Business Day before
12:00  noon  Eastern  Time  will be wired the same day in  Federal  Funds to the
customer's  account at the Bank,  provided that the Fund's custodian is open for
business.  If the  custodian is not open,  payment will be made on the next bank
business day.  Payment for  redemption  orders which are received  between 12:00
noon Eastern Time and the close of regular  trading on the NYSE  (generally 4:00
p.m.  Eastern  Time) on a  Business  Day will be wired in  Federal  Funds to the
customers  account  on the next  bank  business  day  following  receipt  of the
redemption  request.  No charge for wiring redemption payments is imposed by the
Fund,  although the Banks may charge customer accounts for redemption  services.
If all shares are  redeemed,  all accrued but unpaid  dividends  on those shares
will be paid with the redemption proceeds.

     REDEMPTION OF SHARES IN AN ACCOUNT FOR NON-BANK CUSTOMERS.  An investor who
beneficially  owns Shares may redeem  Shares in his account in  accordance  with
instructions and limitations pertaining to his Account by contacting his broker.
If such notice is received by PFPC by 12:00 noon  Eastern  Time on any  Business
Day, the redemption will be effective as of 12:00 noon Eastern Time on that day.
Payment of the redemption proceeds will be made after 12:00 noon Eastern Time on
the day the redemption is effected,  provided that the Fund's  custodian is open
for  business.  If the  custodian is not open,  payment will be made on the next
bank business day. If the redemption  request is received between 12:00 noon and
the close of regular  trading of the NYSE on a Business Day, the redemption will
be effective as of the close of regular trading of the NYSE on such Business Day
and payment will be made on the next bank business day following  receipt of the
redemption request. If all Shares are redeemed, all accrued but unpaid dividends
on those Shares will be paid with the redemption proceeds.

     An investor's  brokerage firm will also redeem each day a sufficient number
of Shares to cover  debit  balances  created by  transactions  in the Account or
instructions  for cash  disbursements.  Shares  will be redeemed on the same day
that a transaction occurs that results in such a debit balance or charge.

     Each  brokerage  firm  reserves  the right to waive or modify  criteria for
participation in an Account or to terminate  participation in an Account for any
reason.

     REDEMPTION  OF SHARES  OWNED  DIRECTLY.  A direct  investor  may redeem any
number of Shares by sending a written request to Sansom Street Money Market, c/o
PFPC, P.O. Box 8950,  Wilmington,  Delaware  19899. It is recommended  that such
requests be sent by registered or certified mail if share certificates accompany
the request.  Redemption requests must be signed by each shareholder in the same
manner as the Shares are registered. Redemption requests

                                       10

<PAGE>

for joint  accounts  require the  signature of each joint owner.  On  redemption
requests  of $5,000 or more,  a signature  guarantee  is  required.  A signature
guarantee may be obtained from a domestic bank or trust company, broker, dealer,
clearing  agency or foreign  association  who are  participants  in a  medallion
program recognized by the Securities Transfer Association.  The three recognized
medallion  programs are Securities  Transfer Agents  Medallion  Program (STAMP),
Stock  Exchanges  Medallion  Program  (SEMP) and New York Stock  Exchange,  Inc.
Medallion  Signature  Program (MSP).  Signature  guarantees that are not part of
these programs will not be accepted.

     Direct investors may redeem Shares without charge by telephone if they have
completed  and  returned  an  account  application  containing  the  appropriate
telephone  election.  To add a  telephone  option to an  existing  account  that
previously did not provide for this option, a Telephone  Authorization Form must
be filed with PFPC.  This form is available  from PFPC.  Once this  election has
been made, the  shareholder  may simply contact PFPC by telephone to request the
redemption by calling  (888)  261-4073.  Neither the Fund,  the  Portfolio,  the
Distributor,  PFPC  nor any  other  Fund  agent  will be  liable  for any  loss,
liability,  cost or expense for following the procedures  described below or for
following instructions communicated by telephone that they reasonably believe to
be genuine.

     The Fund's telephone transaction procedures include the following measures:
(1)  requiring  the  appropriate  telephone  transaction  privilege  forms;  (2)
requiring  the caller to provide  the names of the account  owners,  the account
social  security  number and the name of the Portfolio,  all of which must match
the Fund's records; (3) requiring the Fund's service  representative to complete
a telephone  transaction  form,  listing all of the above caller  identification
information; (4) requiring that redemption proceeds be sent only by check to the
account owners of record at the address of record, or by wire only to the owners
of record at the bank account of record; (5) sending a written  confirmation for
each  telephone  transaction  to the  owners of record at the  address of record
within  five  (5)  business  days of the  call;  and (6)  maintaining  tapes  of
telephone  transactions for six months, if the Fund elects to record shareholder
telephone transactions. For accounts held of record by broker-dealers, financial
institutions,   securities   dealers,   financial  planners  or  other  industry
professionals,  additional documentation or information regarding the scope of a
caller's authority is required.  Finally, for telephone transactions in accounts
held  jointly,   additional  information  regarding  other  account  holders  is
required. Telephone transactions will not be permitted in connection with IRA or
other  retirement  plan  accounts  or  by an  attorney-in-fact  under  power  of
attorney.

     Proceeds of a telephone  redemption  request  will be mailed by check to an
investor's  registered  address unless he has  designated in his  Application or
Telephone  Authorization Form that such proceeds are to be sent by wire transfer
to a specified  checking or savings account.  If proceeds are to be sent by wire
transfer,  a telephone redemption request received prior to the close of regular
trading  on the NYSE  will  result in  redemption  proceeds  being  wired to the
investor's  bank account on the next bank business  day. The minimum  redemption
for proceeds sent by wire  transfer is $2,500.  There is no maximum for proceeds
sent by wire transfer.  The Fund may modify this redemption  service at any time
or charge a service fee upon prior  notice to  shareholders,  although no fee is
currently contemplated.

     REDEMPTION  BY CHECK.  Upon  request,  the Fund  will  provide  any  direct
investor  and any investor who does not have check  writing  privileges  for his
Account with forms of drafts  ("checks")  payable through PNC Bank. These checks
may be made  payable to the order of anyone.  The  minimum  amount of a check is
$100;  however, a broker may establish a higher minimum.  An investor wishing to
use this check writing  redemption  procedure should complete specimen signature
cards (available from PFPC), and then forward such signature cards to PFPC. PFPC
will then  arrange for the checks to be honored by PNC Bank.  Investors  who own
Shares  through an Account  should  contact their  brokers for signature  cards.
Investors  with joint  accounts  may elect to have checks  honored with a single
signature.  Check  redemptions  will be subject to PNC  Bank's  rules  governing
checks. An investor will be able to stop payment on a check redemption. The Fund
or PNC Bank may terminate this redemption service at any time, and neither shall
incur any  liability  for honoring  checks,  for  effecting  redemptions  to pay
checks, or for returning checks which have not been accepted.

     When a check is  presented  to PNC Bank for  clearance,  PNC  Bank,  as the
investor's  agent, will cause the Fund to redeem a sufficient number of full and
fractional Shares owned by the investor to cover the amount of the check. This

                                       11

<PAGE>

procedure  enables the investor to continue to receive dividends on those Shares
representing  the amount being redeemed by check until such time as the check is
presented to PNC Bank.  Pursuant to rules under the 1940 Act,  checks may not be
presented for cash payment at the offices of PNC Bank.  This limitation does not
affect checks used for the payment of bills or cashed at other banks.

                          OTHER REDEMPTION INFORMATION

     The Fund  ordinarily will make payment for all Shares redeemed within seven
days after  receipt by the Fund's  transfer  agent of a request in proper  form.
Although the Fund will redeem Shares purchased by check before the check clears,
payment of  redemption  proceeds  may be delayed for a period up to fifteen days
after their purchase,  pending a determination that the check has cleared.  This
procedure does not apply to Shares  purchased by wire payment.  Investors should
consider  purchasing  Shares  using a certified  or bank check or money order if
they anticipate an immediate need for redemption proceeds.

     The Fund imposes no charge when Shares are redeemed.  The Fund reserves the
right to redeem any account in a Sansom  Street Class  involuntarily,  on thirty
days' notice, if such account drops below $500 and during such thirty-day notice
period the shareholder does not increase such account to at least $500.  Payment
for Shares  redeemed may be postponed  or the right of  redemption  suspended as
provided by the rules of the Securities and Exchange Commission.

NET ASSET VALUE
- --------------------------------------------------------------------------------
     The net asset value per share of the Sansom  Street Class of the  Portfolio
for the purpose of pricing  purchase and redemption  orders is determined  twice
each day, once as of 12:00 noon Eastern Time and once as of the close of regular
trading on the NYSE on each  weekday  with the  exception  of those  holidays on
which  either the NYSE or the FRB, is closed.  Currently,  the NYSE is closed on
weekends and the  customary  national  business  holidays of New Year's Day, Dr.
Martin  Luther  King,  Jr. Day,  Presidents'  Day,  Good Friday,  Memorial  Day,
Independence  Day,  Labor Day,  Thanksgiving  Day and  Christmas  Day and on the
preceding  Friday or  subsequent  Monday when one of these  holidays  falls on a
Saturday  or  Sunday.  The FRB is  currently  closed  on  weekends  and the same
holidays as the NYSE is closed,  as well as Veterans'  Day and Columbus Day. The
net asset value per share of each class of the Portfolio is calculated by adding
the value of the  proportionate  interest of the class in the securities,  cash,
and other assets of the Portfolio,  deducting actual and accrued  liabilities of
the class and  dividing  the result by the number of  outstanding  shares of the
class.  The net asset  value per share of each  class of the Fund is  determined
independently of any of the Fund's other classes.

     The Fund seeks to maintain for the Sansom  Street Class of the  Portfolio a
net asset value of $1.00 per share for purposes of purchases and redemptions and
values its portfolio  securities  on the basis of the  amortized  cost method of
valuation described in the Statement of Additional Information under the heading
"Valuation of Shares."  There can be no assurance that net asset value per share
will not vary.

     With the  approval  of the  Board of  Directors,  the  Portfolio  may use a
pricing service, bank or broker-dealer  experienced in such matters to value the
Portfolio's  securities.  A more  detailed  discussion  of net  asset  value and
security valuation is contained in the Statement of Additional Information.

DISTRIBUTION OF SHARES
- --------------------------------------------------------------------------------
     The Board of  Directors of the Fund  approved and adopted the  Distribution
Agreement  and separate  Plan of  Distribution  for the Sansom Street Class (the
"Plan")  pursuant  to Rule  12b-1  under  the 1940  Act.  Under  the  Plan,  the
Distributor  is entitled to receive from the Sansom Street Class a  distribution
fee,  which is accrued  daily and paid  monthly,  of up to .20% on an annualized
basis of the daily net assets of the Sansom Street  Class.  The actual amount of
such

                                       12

<PAGE>

compensation  under the Plan is agreed upon by the Fund's Board of Directors and
by the Distributor.  Pursuant to the conditions of an exemptive order granted by
the SEC, the  Distributor has agreed to waive its fee with respect to the Sansom
Street Class on any day to the extent  necessary to assure that the fee required
to be  accrued  by such  Class  does not exceed the income of such Class on that
day. In addition, the Distributor may, in its discretion, voluntarily waive from
time to time all or any portion of its distribution fee.

     Under the Distribution Agreement and the relevant Plan, the Distributor may
reallocate an amount up to the full fee that it receives to Dealers,  based upon
the  aggregate  investment  amounts  maintained  by  and  services  provided  to
shareholders of any relevant Class serviced by such financial institutions.  The
Distributor  may also  reimburse  Dealers  for other  expenses  incurred  in the
promotion of the sale of Fund shares. The Distributor and/or Dealers pay for the
cost of printing  (excluding  typesetting) and mailing to prospective  investors
prospectuses  and other  materials  relating  to the Fund as well as for related
direct mail, advertising and promotional expenses.

     The Plan obligates the Fund,  during the period it is in effect,  to accrue
and pay to the  Distributor  on behalf of the  Sansom  Street  Class the fee set
forth above. Payments under the Plan are not based on expenses actually incurred
by the Distributor,  and the payments may exceed distribution  expenses actually
incurred.

SHAREHOLDER SERVICING
- --------------------------------------------------------------------------------
     The Fund has and will  continue to enter into service  agreements  with the
Banks pursuant to which the Banks will render certain support  services to their
customers in consideration  for payment of .25% (on an annualized  basis) of the
average  daily  net  asset  value of such  Shares.  Such  services  may  include
aggregating and processing purchase and redemption requests from their customers
and placing net purchase and redemption  orders with PFPC;  processing  dividend
payments  from the Fund on  behalf  of their  customers;  providing  information
periodically  to their  customers  showing their  positions in the Sansom Street
Class;  providing  sub-accounting  with  respect  to the  Sansom  Street  Shares
beneficially  owned  by  their  customers  or  the  information   necessary  for
sub-accounting;  and providing certain statistical and factual  information.  In
accordance  with the conditions of an exemptive  order granted by the Securities
and Exchange  Commission,  each service  agreement will provide that a Bank will
waive its  servicing  fee with respect to the Sansom  Street Class on any day to
the extent  necessary to assure that the servicing fee required to be accrued by
that Class does not exceed the income of that Class on that day. Their customers
who are beneficial owners of Sansom Street Shares should read this Prospectus in
light of the terms governing their accounts with the Banks.

MANAGEMENT
- --------------------------------------------------------------------------------

BOARD OF DIRECTORS

     The business and affairs of the Fund and each of its investment  portfolios
are managed  under the  direction  of the Fund's  Board of  Directors.  The Fund
currently  operates  or  proposes  to  operate  seventeen  separate   investment
portfolios.  The Sansom  Street Class  represents  interests in the Money Market
Portfolio.

INVESTMENT ADVISER

     BIMC,  an indirect  majority-owned  subsidiary  of PNC Bank,  serves as the
investment adviser for the Portfolio. BIMC has its principal offices at Bellevue
Park Corporate  Center,  400 Bellevue Parkway,  Wilmington,  Delaware 19809. PNC
Bank and its subsidiary  currently manage over $45.9 billion of assets, of which
approximately  $31.4 billion are mutual  funds.  PNC Bank, a national bank whose
principal  business  address is 1600 Market Street,  Philadelphia,  Pennsylvania
19103, is a wholly-owned subsidiary of PNC Bancorp, Inc. PNC Bancorp, Inc., is a
bank  holding  company  and a  wholly-owned  subsidiary  of PNC  Bank  Corp.,  a
multi-bank holding company.

                                       13

<PAGE>

     As investment adviser to the Portfolio,  BIMC manages such Portfolio and is
responsible  for all  purchases and sales of Portfolio  securities.  In entering
into Portfolio  transactions for the Portfolio with a broker, BIMC may take into
account  the  sale  by  such  broker  of  shares  by the  Fund,  subject  to the
requirements of best execution.  The agreement between BIMC and RBB with respect
to the Money  Market  Portfolio  provides  for BIMC to also assist  generally in
supervising  the operations of such  Portfolio,  and to maintain the Portfolio's
financial accounts and records. These administrative  responsibilities have been
delegated to PFPC, as described below.

     For the services  provided to and expenses assumed by it for the benefit of
the Money  Market  Portfolio,  BIMC is entitled to receive the  following  fees,
computed daily and payable  monthly based on the  Portfolio's  average daily net
assets: .45% of the first $250 million;  .40% of the next $250 million; and .35%
of the average  daily net assets of such  Portfolio  in excess of $500  million.
BIMC may in its discretion  from time to time agree to waive  voluntarily all or
any portion of its advisory fee for the Portfolio.

     For the Fund's fiscal year ended August 31, 1998, the Fund paid  investment
advisory fees aggregating  .37% of the average net assets of the Portfolio.  For
the same  period,  BIMC  waived  fees of  approximately  .13% of the average net
assets of the Portfolio.

     Pursuant to its advisory  agreement  with Fund  relating to the  Portfolio,
BIMC may enter into  agreements with its affliates in which it delegates some or
all  of  its  accounting  and  administrative  obligations  under  the  advisory
agreement.  Any such  arrangement  has no effect on the advisory fees payable by
the  Portfolio to BIMC.  BIMC has  delegated to PFPC all of its  accounting  and
administrative  obligations under its advisory  agreement with the Fund relating
to the  Portfolio. PFPC generally  assists the  Portfolio  in all aspects of its
administration  and operation,  including matters relating to the maintenance of
financial  records and  accounting.  PFPC is  entitled  to receive  from BIMC an
administration  fee, computed daily and payable monthly at a rate of .10% of the
average  daily net assets of the  Portfolio.  This has no effect on the advisory
fees payable by the Portfolio to BIMC.  PFPC's principal address is 400 Bellevue
Parkway, Wilmington, Delaware 19809.

     PNC Bank was formerly  sub-adviser  to the Money  Market,  Municipal  Money
Market and  Government  Obligations  Portfolios  and provided  research,  credit
analysis and recommendations  with respect to each such Portfolio's  investments
and supplied  certain  computer  facilities,  personnel and other services.  The
facilities,  personnel,  services and related  expenses have been transferred to
BIMC and in return,  BIMC's  obligation to pay a portion of the sub-advisory fee
to PNC Bank has been  terminated.  For its sub-advisory  services,  PNC Bank was
entitled to receive from BIMC an amount equal to 75% of the investment  advisory
fee paid by each such portfolio to BIMC. The  sub-advisory  fees paid by BIMC to
PNC  Bank  had no  effect  on the  investment  advisory  fees  payable  by  such
portfolios  to BIMC.  The services  provided by BIMC and the fees payable by the
portfolio  for  these  services  are  described  further  in  the  Statement  of
Additional Information under "Management of the Company."

TRANSFER AGENT, DIVIDEND DISBURSING AGENT, AND CUSTODIAN

     PFPC Trust Company, an indirect  wholly-owned subsidiary of PNC Bank Corp.,
will succeed PNC Bank, National Association ("PNC Bank") as the Fund's custodian
pursuant to an assignment. PNC Bank will continue to provide certain services to
PFPC Trust  Company.  PFPC  serves as the  Fund's  transfer  agent and  dividend
disbursing  agent.  The  principal  offices of PFPC are located at 400  Bellevue
Parkway,  Wilmington,  Delaware 19809. PFPC may enter into shareholder servicing
agreements  with  registered   broker-dealers   who  have  entered  into  dealer
agreements  with the  Distributor  ("Authorized  Dealers")  for the provision of
certain shareholder support services to customers of such Authorized Dealers who
are shareholders of the Fund. The services  provided and the fees payable by the
Fund for these services are described in the Statement of Additional Information
under "Investment Advisory, Distribution and Servicing Arrangements."

                                       14

<PAGE>

ADMINISTRATOR

     Pursuant to its advisory  agreement with the Fund with respect to the Money
Market Portfolio, BIMC provides administrative services to the Portfolio, and is
entitled to an administration fee, computed daily and payable monthly at .10% of
average daily net assets of the Portfolio. BIMC has delegated to PFPC all of its
accounting and  administrative  obligations under such advisory  agreement.  The
Fund  has  agreed  to  pay  directly  to  PFPC  the  fees  for   accounting  and
administrative  services  to the Money  Market  Portfolio  which PFPC would have
received  directly  from  BIMC.  Such  arrangement  has no  effect  on the total
advisory  and  administrative  fees payable by such  Portfolio  to BIMC.  PFPC's
principal business address is 400 Bellevue Parkway, Wilmington, Delaware 19809.

DISTRIBUTOR

     Provident  Distributors,  Inc., with a principal  business  address at Four
Falls  Corporate  Center,   West  Conshohocken,   Pennsylvania  19428,  acts  as
distributor  for the Sansom Street Class of the Fund pursuant to a  distribution
agreement dated May 29, 1998 (the "Distribution Agreement").

EXPENSES

     The expenses of each  Portfolio  are deducted from the total income of such
Portfolio  before  dividends are paid. Any general expenses of the Fund that are
not readily  identifiable as belonging to a particular  investment  portfolio of
the Fund will be allocated among all investment  portfolios of the Fund based on
the relative net assets of the  investment  portfolios at the time such expenses
were accrued.  The Sansom Street Classes of the Fund pay their own  distribution
fees,  and may pay a  different  share than  other  classes of the Fund of other
expenses  (excluding advisory and custodial fees) if those expenses are actually
incurred in a different  amount by the Sansom Street  Classes or if they receive
different services.

     The investment  adviser may assume  expenses of the Portfolios from time to
time.  In certain  circumstances,  it may assume such  expenses on the condition
that it is  reimbursed  by the  Portfolio for such amounts prior to the end of a
fiscal  year.  In such event,  the  reimbursement  of such amounts will have the
effect of  increasing a Portfolio's  expense  ratio and of  decreasing  yield to
investors.

     For the fiscal year ended August 31, 1998,  the total expenses were .62% of
average net assets with  respect to the Sansom  Street Class of the Money Market
Portfolio (not taking into account waivers of .13%).

BANKING LAWS

     Banking laws and  regulations  currently  prohibit a bank  holding  company
registered  under the Federal  Bank  Holding Act of 1956 or any bank or non-bank
affiliate thereof from sponsoring, organizing,  controlling, or distributing the
shares of a registered,  open-end investment company continuously engaged in the
issuance of its shares, and prohibit banks generally from issuing, underwriting,
selling or distributing securities, but such banking laws and regulations do not
prohibit such a holding  company or affiliate or banks  generally from acting as
investment  adviser,  transfer agent or custodian to such an investment company,
or from  purchasing  shares of such a company as agent for and upon the order of
such a customer. PNC Bank, BIMC, PFPC, as well as the Banks, are subject to such
banking laws and regulations.  In addition,  state securities laws on this issue
may differ from the  interpretations  of federal law expressed  herein and banks
and financial  institutions  may be required to register as dealers  pursuant to
state law.

                                       15

<PAGE>

     Should future  legislative,  judicial or administrative  action prohibit or
restrict the  activities  of Banks in  connection  with the provision of support
services to their  customers,  the Fund might be required to alter materially or
cause the Fund to discontinue its  arrangements  with Banks generally and change
its method of  operations  with respect to the Sansom Street  Shares.  It is not
anticipated,  however,  that any change in the Fund's method of operations would
affect  its net asset  value per  share or  result  in a  financial  loss to any
customer.

DIVIDENDS AND DISTRIBUTIONS
- --------------------------------------------------------------------------------
     The Fund will distribute substantially all of the net investment income and
net  realized  capital  gains,  if  any,  of the  Portfolio  to the  Portfolio's
shareholders.  All  distributions  are reinvested in the form of additional full
and  fractional  Shares of the Sansom Street Class unless a  shareholder  elects
otherwise.

     The net investment income (not including any net short-term  capital gains)
earned by the Portfolio will be declared as a dividend on a daily basis and paid
monthly.  Dividends are payable to shareholders of record  immediately  prior to
the  determination of net asset value made as of the close of regular trading of
the NYSE.  Net short-term  capital  gains,  if any, will be distributed at least
annually.

TAXES
- --------------------------------------------------------------------------------
     Distributions  from the Money Market Portfolio will generally be taxable to
shareholders.   It  is  expected  that  all,  or  substantially  all,  of  these
distributions will consist of ordinary income. You will be subject to income tax
on these distributions regardless whether they are paid in cash or reinvested in
additional  shares.  The one major  exception  to these tax  principles  is that
distributions on shares held in an IRA (or other tax-qualified plan) will not be
currently taxable.

     The  foregoing  is only a summary of certain tax  considerations  under the
current law,  which may be subject to change in the future.  You should  consult
your tax adviser for further information regarding federal,  state, local and/or
foreign tax consequences relevant to your specific situation.

DESCRIPTION OF SHARES
- --------------------------------------------------------------------------------
     The Fund has  authorized  capital of thirty billion shares of Common Stock,
$.001 par  value  per  share,  of which  18.326  billion  shares  are  currently
classified  into 97  different  classes  of Common  Stock (see  "Description  of
Shares" in the Statement of Additional Information).

     The Fund offers multiple classes of shares in the Money Market Portfolio to
expand its  marketing  alternatives  and to  broaden  its range of  services  to
different investors. The expenses of the various classes within these Portfolios
vary based upon the services provided, which may affect performance.  Each class
of Common Stock of the Fund has a separate Rule 12b-1  distribution  plan. Under
the Distribution  Agreement and pursuant to each of the distribution  plans, the
Distributor  is  entitled  to  receive  from  each  class  as  compensation  for
distribution services provided to that class a distribution fee based on average
daily  net  assets.  A  salesperson  or any other  person  entitled  to  receive
compensation for servicing Fund shares may receive  different  compensation with
respect to different classes in a Portfolio of the Fund. An investor may contact
the Fund's  Distributor by calling  1-800-888-9723  to request more  information
concerning other classes available.

                                       16

<PAGE>

     THIS  PROSPECTUS AND THE STATEMENT OF ADDITIONAL  INFORMATION  INCORPORATED
HEREIN RELATE PRIMARILY TO THE SANSOM STREET CLASS OF THE MONEY MARKET PORTFOLIO
AND DESCRIBE ONLY THE INVESTMENT OBJECTIVES AND POLICIES, OPERATIONS,  CONTRACTS
AND OTHER MATTERS RELATING TO THE SANSOM STREET CLASS OF THIS PORTFOLIO.

     Each  share  that  represents  an  interest  in a  Portfolio  has an  equal
proportionate interest in the assets belonging to such Portfolio with each other
share that  represents an interest in such  Portfolio,  even where a share has a
different class designation than another share  representing an interest in that
Portfolio.  Shares of the Fund do not have preemptive or conversion rights. When
issued for payment as described in this  Prospectus,  shares of the Fund will be
fully paid and non-assessable.

     The Fund currently does not intend to hold annual  meetings of shareholders
except  as  required  by the 1940 Act or other  applicable  law.  The law  under
certain circumstances provides shareholders with the right to call for a meeting
of shareholders to consider the removal of one or more directors.  To the extent
required  by law,  the Fund will  assist in  shareholder  communication  in such
matters.

     Holders of shares of the  Portfolios  will vote in the aggregate and not by
class  on  all  matters,  except  where  otherwise  required  by  law.  Further,
shareholders of all investment portfolios of the Fund will vote in the aggregate
and not by portfolio  except as  otherwise  required by law or when the Board of
Directors determines that the matter to be voted upon affects only the interests
of the shareholders of a particular investment portfolio.  (See the Statement of
Additional Information under "Additional Information Concerning Fund Shares" for
examples when the 1940 Act requires voting by investment portfolio or by class.)
Shareholders  of the Fund are  entitled  to one vote for each  full  share  held
(irrespective of class or portfolio) and fractional votes for fractional  shares
held.  Voting rights are not cumulative  and,  accordingly,  the holders of more
than 50% of the  aggregate  shares of Common  Stock of the Fund may elect all of
the directors.

     As of November 16, 1998, to the Fund's knowledge,  no person held of record
or beneficially  25% or more of the outstanding  shares of all of the classes of
the Fund.

OTHER INFORMATION
- --------------------------------------------------------------------------------

REPORTS AND INQUIRIES

     Shareholders  will receive  unaudited  semi-annual  reports  describing the
Fund's  investment   operations  and  annual  financial  statements  audited  by
independent accountants.  Shareholder inquiries should be addressed to PFPC, the
Fund's transfer agent,  Bellevue Park Corporate  Center,  400 Bellevue  Parkway,
Wilmington, Delaware 19809, toll free (800) 430-9618.

                                       17

<PAGE>

NO  PERSON  HAS  BEEN  AUTHORIZED  TO  GIVE  ANY  INFORMATION  OR  TO  MAKE  ANY
REPRESENTATIONS  NOT CONTAINED IN THIS PROSPECTUS OR IN THE FUND'S  STATEMENT OF
ADDITIONAL INFORMATION  INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE
OFFERING MADE BY THIS  PROSPECTUS  AND, IF GIVEN OR MADE,  SUCH  INFORMATION  OR
REPRESENTATIONS  MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THEFUND OR
ITS  DISTRIBUTOR. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY THE FUND OR
BY THEDISTRIBUTOR IN ANY JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY BE
MADE.

<PAGE>




ROBERTSON
STEPHENS
FUNDS
[LOGO OMITTED]

555 California Street, Suite 2600
San Francisco, California 94104

FUND NEWS &
INFORMATION
ROBERTSON STEPHENS
INVESTOR SERVICES

(BULLET) Licensed mutual fund representatives
(BULLET) Automated access to daily net asset values
(BULLET) Toll-free shareholder service line
         1-800-766-3863

ON THE WEB
    http://www.rsim.com


VIA E-MAIL
    [email protected]


ACCOUNTLINK
    Automated account information,
    24 hours a day.
    1-800-624-8025

<PAGE>
                                   THE SANSOM
                                     STREET
                                     FAMILY

                             MONEY MARKET PORTFOLIO

                                 MUNICIPAL MONEY
                                MARKET PORTFOLIO

                                       AND

                             GOVERNMENT OBLIGATIONS
                             MONEY MARKET PORTFOLIO


                                   Prospectus
                                December 29, 1998

<PAGE>

                            THE SANSOM STREET FAMILY
                                       OF
                               THE RBB FUND, INC.

     The Sansom Street  Family  consists of three classes of common stock of The
RBB Fund, Inc. (the "Fund"),  an open-end  management  investment  company.  The
shares  of the  Sansom  Street  Classes  offered  by this  Prospectus  represent
interests  in a  taxable  money  market  portfolio,  a  municipal  money  market
portfolio  and  a  U.S.  Government  obligations  money  market  portfolio.  The
investment  objectives of each investment portfolio described in this Prospectus
are as follows:

         MONEY MARKET PORTFOLIO--to  provide as high a level of current interest
     income  as is  consistent  with  maintaining  liquidity  and  stability  of
     principal. It seeks to achieve such objective by investing in a diversified
     portfolio of U.S. dollar-denominated money market instruments.

         MUNICIPAL MONEY MARKET PORTFOLIO--to provide as high a level of current
     interest  income  exempt from federal  income taxes as is  consistent  with
     maintaining liquidity and stability of principal.  It seeks to achieve such
     objective by  investing  substantially  all of its assets in a  diversified
     portfolio of short-term Municipal Obligations.  "Municipal Obligations" are
     obligations  issued by or on behalf of states,  territories and possessions
     of the  United  States,  the  District  of  Columbia,  and their  political
     subdivisions,  agencies,  instrumentalities and authorities. During periods
     of  normal  market  conditions,  at  least  80% of the  net  assets  of the
     Portfolio will be invested in Municipal Obligations,  the interest on which
     is exempt from the regular  federal  income tax but which may constitute an
     item of tax preference for purposes of the federal alternative minimum tax.

         GOVERNMENT  OBLIGATIONS  MONEY MARKET  PORTFOLIO--to  provide as high a
     level  of  current  interest  income  as  is  consistent  with  maintaining
     liquidity and stability of principal. It seeks to achieve such objective by
     investing in short-term U.S.  Treasury bills,  notes and other  obligations
     issued  or   guaranteed   by  the  U.S.   Government  or  its  agencies  or
     instrumentalities, and repurchase agreements relating to such obligations.

     SHARES OF THE FUND ARE NOT DEPOSITS OR  OBLIGATIONS  OF, OR  GUARANTEED  OR
ENDORSED BY PNC BANK, NATIONAL ASSOCIATION, PFPC TRUST COMPANY OR ANY OTHER BANK
AND  SHARES  ARE  NOT  FEDERALLY   INSURED  BY  THE  FEDERAL  DEPOSIT  INSURANCE
CORPORATION,  THE FEDERAL  RESERVE  BOARD,  OR ANY OTHER AGENCY.  INVESTMENTS IN
SHARES OF THE FUND INVOLVE  INVESTMENT  RISKS,  INCLUDING  THE POSSIBLE  LOSS OF
PRINCIPAL.  THERE  CAN BE NO  ASSURANCE  THAT  THE  PORTFOLIOS  WILL  BE ABLE TO
MAINTAIN A STABLE NET ASSET VALUE OF $1.00 PER SHARE.

     BlackRock Institutional Management Corporation serves as investment adviser
for these  Portfolios  and PFPC Trust Company  serves as custodian for the Fund.
PFPC Inc. serves as administrator and as transfer and dividend  disbursing agent
for the Fund. Provident Distributors, Inc. acts as distributor for the Fund.

     Sansom  Street  Shares  are sold by the  Fund's  distributor  to  customers
maintaining  accounts with banks  affiliated  with PNC Bank Corp. (the "Banks").
Sansom Street Shares will be sold to customers,  including individuals,  trusts,
partnerships and corporations,  who maintain accounts (such as custody, trust or
escrow  accounts) with the Banks, and who have authorized the Banks to invest in
the Fund. Shares are sold and redeemed without any purchase or redemption charge
imposed by the Fund,  although the Banks may receive  compensation from the Fund
and charge their customer  accounts for services provided in connection with the
purchase or redemption of shares.  See  "Shareholder  Servicing."  Sansom Street
Shares are also sold through  dealers that have entered into a dealer  agreement
with the Fund's Distributor.

     This Prospectus  contains concise  information that a prospective  investor
needs to know before investing. Please keep it for future reference. A Statement
of  Additional  Information,  dated  December 29, 1998,  has been filed with the
Securities  and Exchange  Commission  and is  incorporated  by reference in this
Prospectus.  It may be  obtained  upon  request  free of charge from the Fund by
calling (800) 430-9618.  The Prospectus and Statement of Additional  Information
are also available for reference, along with other related materials, on the SEC
Internet Website (http://www.sec.gov).
- --------------------------------------------------------------------------------
THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THIS
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------

PROSPECTUS                                                     December 29, 1998

<PAGE>

INTRODUCTION
- --------------------------------------------------------------------------------
     The  RBB  Fund,  Inc.  is  an  open-end   management   investment   company
incorporated  under the laws of the State of Maryland on February 29, 1988.  The
Fund  is  currently   operating  or  proposing  to  operate  seventeen  separate
investment  portfolios.  Each of the three  classes  (collectively,  the "Sansom
Street Classes") of the Fund's shares (collectively,  the "Sansom Street Shares"
or  "Shares")  offered by this  Prospectus  represents  interests  in one of the
following investment portfolios: the Money Market Portfolio, the Municipal Money
Market  Portfolio  and  the  Government   Obligations   Money  Market  Portfolio
(together, the "Portfolios").

     The MONEY MARKET PORTFOLIO'S  investment  objective is to provide as high a
level of current interest income as is consistent with maintaining liquidity and
stability of  principal.  It seeks to achieve  such  objective by investing in a
diversified portfolio of U.S.  dollar-denominated money market instruments which
meet certain  ratings  criteria  and which  present  minimal  credit  risks.  In
pursuing its investment objective, the Money Market Portfolio invests in a broad
range of government,  bank and commercial  obligations  that may be available in
the money markets.

     The MUNICIPAL MONEY MARKET PORTFOLIO'S  investment  objective is to provide
as high a level of current  interest  income exempt from federal income taxes as
is consistent with maintaining liquidity and stability of principal.  To achieve
this objective the Municipal Money Market Portfolio invests substantially all of
its assets in a diversified  portfolio of short-term Municipal Obligations which
meet certain  ratings  criteria and which present  minimal credit risks.  During
periods  of normal  market  conditions,  at least  80% of the net  assets of the
Portfolio  will be invested in Municipal  Obligations,  the interest on which is
exempt from the regular  federal  income tax but which may constitute an item of
tax preference for purposes of the federal alternative minimum tax.

     The GOVERNMENT OBLIGATIONS MONEY MARKET PORTFOLIO'S investment objective is
to provide  as high a level of current  interest  income as is  consistent  with
maintaining liquidity and stability of principal. To achieve its objective,  the
Government  Obligations Money Market Portfolio invests exclusively in short-term
U.S.  Treasury bills,  notes and other  obligations  issued or guaranteed by the
U.S. Government or its agencies or instrumentalities, and enters into repurchase
agreements relating to such obligations.

     Each of the  Portfolios  seeks to  maintain a net asset  value of $1.00 per
share;  however,  there can be no assurance that the Portfolios  will be able to
maintain a stable net asset value of $1.00 per share.

     The Portfolios'  investment adviser is BlackRock  Institutional  Management
Corporation  ("BIMC").  PFPC Trust  Company  serves as custodian to the Fund and
PFPC Inc. ("PFPC") serves as administrator and transfer and dividend  disbursing
agent to the Fund.  Provident  Distributors,  Inc. (the  "Distributor")  acts as
distributor of the Fund's shares.

     An investment in any of the Portfolios is subject to certain risks,  as set
forth in detail under  "Investment  Objectives and Policies." Some or all of the
Portfolios,  to the extent set forth under "Investment Objectives and Policies,"
may  engage  in the  following  investment  practices:  the  use  of  repurchase
agreements and reverse repurchase  agreements,  the purchase of mortgage-related
securities, the purchase of securities on a "when-issued" or "forward commitment
basis," the purchase of stand-by commitments and the lending of securities.  All
of  these  transactions  involve  certain  special  risks,  as set  forth  under
"Investment Objectives and Policies."

     For detailed information of how to purchase or redeem Sansom Street Shares,
please refer to the section of this Prospectus entitled "Purchase and Redemption
of Shares."

                                       2

<PAGE>

FEE TABLE

     The Fee Table  below  contains a summary of the annual  operating  expenses
incurred by the Sansom Street Class of the Money Market Portfolio for the fiscal
year ended  August 31, 1998 as a  percentage  of average  daily net assets.  The
figures  shown for the Sansom  Street  Classes  of the  Municipal  Money  Market
Portfolio  and  Government  Obligations  Money  Market  Portfolio  are  based on
expenses  expected  to be incurred by such  Classes of these  Portfolios  in the
current  fiscal  period in the event that Shares of these Classes are offered to
the public. No shares of these Classes were offered during the fiscal year ended
August 31,  1998.  An example  based on the summary is also  shown.  

ANNUAL FUND OPERATING EXPENSES (SANSOM STREET CLASSES)
     AS A PERCENTAGE OF AVERAGE DAILY NET ASSETS
<TABLE>
<CAPTION>
                                                                                                   GOVERNMENT
                                                                                   MUNICIPAL       OBLIGATIONS
                                                               MONEY MARKET      MONEY MARKET     MONEY MARKET
                                                                 PORTFOLIO         PORTFOLIO        PORTFOLIO
                                                               ------------      ------------     ------------
<S>                                                                 <C>               <C>              <C> 
Management fees (after waivers)(1) ...........................      .24%              .08%             .30%
12b-1 fees(1) ................................................      .05               .05              .05
Other Expenses ...............................................      .20               .30              .24
                                                                   ----              ----             ----
Total Fund Operating Expenses (Sansom Street Classes)
   (after waivers)(1) ........................................      .49%              .43%             .59%
                                                                   ====              ====             ====
<FN>

(1) Management  Fees and 12b-1 Fees are each  based on average  daily net assets
    and are  calculated  daily and paid  monthly.  Before  waivers for the Money
    Market   Portfolio,   Municipal   Money  Market   Portfolio  and  Government
    Obligations Money Market Portfolio,  Management Fees would be .37%, .34% and
    .42%,  respectively,  and Total Fund Operating  Expenses would be .62%, .69%
    and .71%, respectively.
</FN>
</TABLE>

EXAMPLE

     An  investor  would  pay the  following  expenses  on a $1,000  investment,
assuming (1) 5% annual return and (2) redemption at the end of each time period:

                                             1 YEAR  3 YEARS  5 YEARS  10 YEARS
                                             ------  -------  -------  --------
Money Market* .............................    $5      $16      $27       $62
Municipal Money Market* ...................    $4      $13      $22       $49
Government Obligations Money Market* ......    $6      $19      $33       $74

* Other classes of these Portfolios are sold with different fees and expenses.

     The Example in the Fee Table assumes that all  dividends and  distributions
are  reinvested  and  that the  amounts  listed  under  "Annual  Fund  Operating
Expenses"  remain  the  same in the  years  shown.  THE  EXAMPLE  SHOULD  NOT BE
CONSIDERED A  REPRESENTATION  OF PAST OR FUTURE EXPENSES AND ACTUAL EXPENSES MAY
BE GREATER OR LESS THAN THOSE SHOWN.

     The Fee Table is  designed  to  assist an  investor  in  understanding  the
various costs and expenses that an investor in the Sansom Street  Classes of the
Fund will bear directly or indirectly.  (For more complete  descriptions  of the
various costs and expenses, see "Management--Investment  Adviser," "Distribution
of Shares" and  "Shareholder  Servicing"  below.)  Expense  figures are based on
actual costs and fees charged to each class.  The Fee Table reflects a voluntary
waiver of Management Fees for each Portfolio. However, there can be no assurance
that any  future  waivers  of  Management  Fees will not vary  from the  figures
reflected in the Fee Table.  In addition,  the  investment  adviser is currently
voluntarily  assuming additional  expenses of the Money Market Portfolio.  There
can be no assurance  that the  investment  adviser will  continue to assume such
expenses.  Assumption of additional  expenses will have the effect of lowering a
Portfolio's overall expense ratio and increasing its yield to investors.

                                       3

<PAGE>

     From time to time a Portfolio  advertises its "total  return,"  "yield" and
"effective  yield."  TOTAL  RETURN  AND YIELD  FIGURES  ARE BASED ON  HISTORICAL
EARNINGS AND ARE NOT INTENDED TO INDICATE FUTURE  PERFORMANCE.  The "yield" of a
Portfolio  refers to the income generated by an investment in a Portfolio over a
seven-day period (which period will be stated in the advertisement). This income
is then  "annualized." That is, the amount of income generated by the investment
during that week is assumed to be generated  each week over a 52-week period and
is shown as a percentage of the investment.  The "effective yield" is calculated
similarly  but,  when  annualized,  the  income  earned  by an  investment  in a
Portfolio is assumed to be reinvested.  The  "effective  yield" will be slightly
higher  than the  "yield"  because  of the  compounding  effect of this  assumed
reinvestment.  The Municipal Money Market Portfolio's "tax-equivalent yield" may
also be quoted from time to time,  which shows the level of taxable yield needed
to produce an after-tax  equivalent to such Portfolio's  tax-free yield. This is
done by increasing  the  Portfolio's  yield  (calculated as above) by the amount
necessary to reflect the payment of federal income tax at a stated tax rate.

The  total  return  and yield of any  investment  is  generally  a  function  of
portfolio  quality and  maturity,  type of  investment,  operating  expenses and
market  conditions.  The total  return and yield on Shares of each of the Sansom
Street Classes will fluctuate and is not  necessarily  representative  of future
results.  Any fees  charged  by the Banks or  broker/dealers  directly  to their
customers in connection with investments in a Portfolio are not reflected in the
total return and yields on a Portfolio's Shares, and such fees, if charged, will
reduce the actual return  received by  shareholders  on their  investments.  The
total return and yield on Shares of Sansom Street  Classes may differ from total
return  and yields on shares of other  classes  of the Fund that also  represent
interests in the same Portfolio  depending on the allocation of expenses to each
of the classes of that Portfolio.

FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
     The table below sets forth certain  information  concerning  the investment
results of the Sansom Street  Classes for the periods  indicated.  The financial
data  included  in this table for each of the  periods  ended  August  31,  1994
through August 31, 1998 are part of the Fund's financial  statements for each of
the Portfolios,  which have been incorporated by reference into the Statement of
Additional  Information  and have been  audited  by  PricewaterhouseCoopers  LLP
("PricewaterhouseCoopers"),  the Fund's independent  accountants.  The financial
data for each such Portfolio for the periods ended August 31, 1989,  1990, 1991,
1992  and  1993  are  a  part  of  previous  financial   statements  audited  by
PricewaterhouseCoopers. No financial data for the periods ended August 31, 1994,
1995,  1996,  1997 and 1998 are  included  for the  Sansom  Street  Class of the
Municipal Money Market Portfolio as no shares of such Class had been sold to the
public during these  periods and for the Sansom  Street Class of the  Government
Obligations  Money Market Portfolio as such Class ceased  operations on December
4, 1991.  The financial data included in the table should be read in conjunction
with the financial  statements and notes thereto.  Further information about the
performance of the Portfolios is available in the Annual Report to Shareholders.
Both  the  Statement  of  Additional   Information  and  the  Annual  Report  to
Shareholders  may be obtained free of charge by calling the telephone  number on
page 1 of this Prospectus.

                                       4


<PAGE>

SANSOM STREET CLASSES

                            THE SANSOM STREET FAMILY
                               THE RBB FUND, INC.

FINANCIAL HIGHLIGHTS (c)
     (FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

<TABLE>
<CAPTION>
                                                                       MONEY MARKET PORTFOLIO
                            ------------------------------------------------------------------------------------------------------
                                                                                                                                  
                                                                                                                                  
                              FOR THE      FOR THE     FOR THE      FOR THE      FOR THE      FOR THE      FOR THE      FOR THE   
                            YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED   YEAR ENDED 
                            AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31,   AUGUST 31, 
                               1998         1997         1996         1995         1994         1993         1992         1991    
                            ----------   ----------   ----------   ----------   ----------   ----------   ----------   ---------- 
<S>                          <C>          <C>          <C>          <C>          <C>          <C>          <C>          <C>       
Net asset value,
   beginning of period ..... $   1.00     $    1.00    $   1.00     $   1.00     $   1.00     $   1.00     $   1.00     $   1.00  
                             --------     ---------    --------     --------     --------     --------     --------     --------  
Income from investment
   operations:
   Net investment income ...    .0520        0.0510      0.0518       0.0543       0.0334       0.0304       0.0435       0.0684  
   Net gains on securities
     (both realized
     and unrealized) .......       --            --          --           --           --           --       0.0007           --  
                             --------     ---------    --------     --------     --------     --------     --------     --------  
       Total from
         investment
         operations ........    .0520        0.0510      0.0518       0.0543       0.0334       0.0304       0.0442       0.0684  
                             --------     ---------    --------     --------     --------     --------     --------     --------  
Less distributions
   Dividends (from net
     investment income) ....   (.0520)      (0.0510)    (0.0518)     (0.0543)     (0.0334)     (0.0304)     (0.0435)     (0.0684) 
   Distributions (from
     capital gains) ........       --            --          --           --           --           --      (0.0007)          --  
                             --------     ---------    --------     --------     --------     --------     --------     --------  
       Total distributions .   (.0520)      (0.0510)    (0.0518)     (0.0543)     (0.0334)     (0.0304)     (0.0442)     (0.0684) 
                             --------     ---------    --------     --------     --------     --------     --------     --------  
Net asset value,
   end of period ........... $   1.00     $    1.00    $   1.00     $   1.00     $   1.00     $   1.00     $   1.00     $   1.00  
                             ========     =========    ========     ========     ========     ========     ========     ========  

Total Return ...............    5.34%         5.22%       5.30%        5.57%        3.39%        3.08%        4.51%        7.06%  
Ratios/Supplemental Data
   Net Assets, end of
     period (000) .......... $684,066     $ 570,018    $524,359     $441,614     $373,745     $190,794     $228,079     $138,418  
   Ratios of expenses to
     average net assets ....   .49%(a)       .49%(a)     .48%(a)      .39%(a)      .39%(a)      .34%(a)      .35%(a)      .37%(a) 
   Ratios of net investment
     income to average
     net assets ............    5.20%         5.10%       5.18%        5.43%        3.34%        3.04%        4.35%        6.84%  
</TABLE>

<TABLE>
<CAPTION>
                                  MONEY MARKET PORTFOLIO
                              -------------------------------
                                             FOR THE PERIOD
                                           SEPTEMBER 30, 1988
                               FOR THE       (COMMENCEMENT  
                              YEAR ENDED   OF OPERATIONS) TO
                              AUGUST 31,       AUGUST 31,
                                 1990             1989
                              ----------   ------------------
<S>                            <C>              <C>      
Net asset value,
   beginning of period .....   $   1.00         $    1.00
                               --------         ---------
Income from investment
   operations:
   Net investment income ...     0.0810            0.0818
   Net gains on securities
     (both realized
     and unrealized) .......         --                --
                               --------         ---------
       Total from
         investment
         operations ........     0.0810            0.0818
                               --------         ---------
Less distributions
   Dividends (from net
     investment income) ....    (0.0810)          (0.0818)
   Distributions (from
     capital gains) ........         --                --
                               --------         ---------
       Total distributions .    (0.0810)          (0.0818)
                               --------         ---------
Net asset value,
   end of period ...........   $   1.00         $    1.00
                               ========         =========

Total Return ...............      8.40%           9.25%(b)
Ratios/Supplemental Data
   Net Assets, end of
     period (000) ..........   $106,743         $  79,656
   Ratios of expenses to
     average net assets ....     .47%(a)        .50%(a)(b)
   Ratios of net investment
     income to average
     net assets ............      8.10%           9.04%(b)

<FN>
(a) Without the waiver of advisory fees and without the reimbursement of certain
    operating  expenses,  the ratios of  expenses  to average net assets for the
    Money Market  Portfolio would have been .62%,  .64%, .65%, .59%, .60%, .60%,
    .61%, .61% and .73% for the years ended August 31, 1998,  1997,  1996, 1995,
    1994, 1993, 1992, 1991, and 1990, respectively,  and .83% annualized for the
    period ended August 31, 1989.

(b) Annualized.

(c) Financial  Highlights  relate  solely to the Sansom  Street  Class of Shares
    within the Portfolio.
</FN>
</TABLE>

                                        5

<PAGE>

SANSOM STREET CLASSES

                            THE SANSOM STREET FAMILY
                               THE RBB FUND, INC.

FINANCIAL HIGHLIGHTS(c)
     (FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)(d)

<TABLE>
<CAPTION>
                                                                           MUNICIPAL MONEY MARKET PORTFOLIO
                                            -------------------------------------------------------------------------------------
                                                                                                                 FOR THE PERIOD
                                                                                                               SEPTEMBER 30, 1988
                                                 FOR THE          FOR THE         FOR THE         FOR THE       (COMMENCEMENT OF
                                               YEAR ENDED       YEAR ENDED      YEAR ENDED       YEAR ENDED      OPERATIONS) TO
                                            AUGUST 31, 1993  AUGUST 31, 1992  AUGUST 31, 1991  AUGUST 31, 1990  AUGUST 31, 1989
                                            ---------------  ---------------  ---------------  ---------------  -----------------
<S>                                              <C>          <C>               <C>            <C>                  <C>        
Net asset value, beginning of period .......     $  1.00      $     1.00        $      1.00    $      1.00          $      1.00
                                                 -------      ----------        -----------    -----------          -----------
Income from investment operations:
   Net investment income ...................      0.0233          0.0325             0.0471         0.0559               0.0537
   Net gains on securities (both realized
     and unrealized) .......................          --              --                 --             --                   --
                                                 -------      ----------        -----------    -----------          -----------
       Total from investment operations ....      0.0233          0.0325             0.0471         0.0559               0.0537
                                                 -------      ----------        -----------    -----------          -----------
Less distributions
   Dividends (from net investment income) ..     (0.0233)        (0.0325)           (0.0471)       (0.0559)             (0.0537)
   Distributions (from capital gains) ......          --              --                 --             --                   --
                                                 -------      ----------        -----------    -----------          -----------
       Total distributions .................     (0.0233)        (0.0325)           (0.0471)       (0.0559)             (0.0537)
                                                 -------      ----------        -----------    -----------          -----------
Net asset value, end of period .............     $  1.00      $     1.00        $      1.00    $      1.00          $      1.00
                                                 =======      ==========        ===========    ===========          ===========
Total Return ...............................       2.35%           3.30%              4.81%          5.74%              5.99%(b)
Ratios/Supplemental Data
   Net assets, end of period (000) .........     $   928      $3,025,781        $15,289,016    $24,781,689          $21,470,715
   Ratios of expenses to average
     net assets ............................      .39%(a)         .39%(a)            .34%(a)        .38%(a)              .50%(a)(b)
   Ratios of net investment income
     to average net assets .................       2.33%           3.25%              4.71%          5.59%              5.93%(b)

<FN>
(a) Without the waiver of advisory, administration, and transfer agency fees and
    without  the  reimbursement  of certain  operating  expenses,  the ratios of
    expenses to average net assets for the Municipal  Money Market  Portfolio is
    not reported for the periods  ended August 31, 1998,  1997,  1996,  1995 and
    1994 and would  have been  3.02%,  .87%,  .73% and .77% for the years  ended
    August 31, 1993, 1992, 1991, and 1990, respectively, and .95% annualized for
    the period ended August 31, 1989.

(b) Annualized.

(c) Financial  Highlights  relate  solely to the Sansom  Street  Class of Shares
    within the Portfolio.

(d) No Shares of this class had been sold to the public during the periods ended
    August 31, 1998, 1997, 1996, 1995 and 1994.
</FN>
</TABLE>

                                       6

<PAGE>

SANSOM STREET CLASSES

                            THE SANSOM STREET FAMILY
                               THE RBB FUND, INC.

FINANCIAL HIGHLIGHTS(c)
     (FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

<TABLE>
<CAPTION>
                                                                           GOVERNMENT OBLIGATIONS MONEY MARKET PORTFOLIO
                                                            ------------------------------------------------------------------------
                                                                                                                     FOR THE PERIOD
                                                                                                                   OCTOBERR 18, 1988
                                                                  FOR THE           FOR THE          FOR THE       (COMMENCEMENT OF
                                                                YEAR ENDED         YEAR ENDED       YEAR ENDED      OPERATIONS) TO
                                                            AUGUST 31, 1992(d)  AUGUST 31, 1991  AUGUST 31, 1990    AUGUST 31, 1989
                                                            ------------------  ---------------  ---------------   -----------------
<S>                                                               <C>                <C>              <C>               <C>
Net asset value, beginning of period ......................       $  1.00            $  1.00          $  1.00           $  1.00
                                                                  -------            -------          -------           -------
Income from investment operations:
   Net investment income ..................................        0.0153             0.0699           0.0843            0.0816
   Net gains on securities (both realized and unrealized) .            --                 --               --                --
                                                                  -------            -------          -------           -------
       Total from investment operations ...................        0.0153             0.0699           0.0843            0.0816
                                                                  -------            -------          -------           -------
Less distributions
   Dividends (from net investment income) .................       (0.0153)           (0.0699)         (0.0843)          (0.0816)
   Distributions (from capital gains) .....................            --                 --               --                --
                                                                  -------            -------          -------           -------
       Total distributions ................................       (0.0153)           (0.0699)         (0.0843)          (0.0816)
                                                                  -------            -------          -------           -------
Net asset value, end of period ............................       $  1.00            $  1.00          $  1.00           $  1.00
                                                                  =======            =======          =======           =======
Total Return ..............................................       6.02%(b)             7.23%            8.79%           9.31%(b)
Ratios/Supplemental Data
   Net assets, end of period (000) ........................            --            $   125          $   117           $   108
   Ratios of expenses to average net assets ...............          --(a)              --(a)            --(a)             --(a)
   Ratios of net investment income to average net assets ..         5.85%              6.99%            8.43%           8.91%(b)

<FN>
(a) Without the waiver of advisory,  distribution  and transfer  agency fees and
    without  the  reimbursement  of certain  operating  expenses,  the ratios of
    expenses to average net assets for the Government  Obligations  Money Market
    Portfolio is not reported for the periods ended December 4, 1991, August 31,
    1991,  1990  and  1989 as no  shares  of the  Sansom  Street  Class  of that
    Portfolio had been sold to the public during such years.

(b) Annualized.

(c) Financial  Highlights  relate  solely to the Sansom  Street  Class of Shares
    within the Portfolio.

(d) This Class of shares ceased operations on December 4, 1991.
</FN>
</TABLE>

                                       7

<PAGE>

INVESTMENT OBJECTIVES AND POLICIES
- --------------------------------------------------------------------------------

                             MONEY MARKET PORTFOLIO

     The Money Market Portfolio's  investment  objective is to provide as high a
level of current interest income as is consistent with maintaining liquidity and
stability of principal. Portfolio obligations held by the Money Market Portfolio
have remaining  maturities of 397 days or less (exclusive of securities  subject
to  repurchase  agreements).  In pursuing its  investment  objective,  the Money
Market Portfolio invests in a diversified  portfolio of U.S.  dollar-denominated
instruments,  such as government,  bank and commercial obligations,  that may be
available  in the  money  markets  ("Money  Market  Instruments")  and that meet
certain  ratings  criteria and present  minimal credit risks to the Money Market
Portfolio.  See "Eligible  Securities." There is no assurance that the Portfolio
will achieve its investment objective. The following descriptions illustrate the
types of Money Market Instruments in which the Money Market Portfolio invests.

     BANK OBLIGATIONS.  The Portfolio may purchase obligations of issuers in the
banking  industry,  such as short-term  obligations  of bank holding  companies,
certificates of deposit, bankers' acceptances and time deposits,  including U.S.
dollar-denominated  instruments  issued or  supported  by the credit of U.S.  or
foreign  banks  or  savings  institutions  having  total  assets  at the time of
purchase in excess of $1 billion.  The  Portfolio  may invest  substantially  in
obligations  of  foreign  banks or  foreign  branches  of U.S.  banks  where the
investment  adviser deems the instrument to present  minimal credit risks.  Such
investments  may  nevertheless  entail  risks in  addition  to those of domestic
issuers,   including  higher   transaction   costs,   less  complete   financial
information,  less stringent regulatory  requirements and less market liquidity.
The Portfolio may also make interest-bearing  savings deposits in commercial and
savings banks in amounts not in excess of 5% of its total assets.

     COMMERCIAL PAPER. The Portfolio may purchase commercial paper (i) rated (at
the time of  purchase)  in the two  highest  rating  categories  of at least two
nationally recognized statistical rating organizations  ("Rating  Organization")
or, by the only Rating  Organization;  or (ii) issued by issuers (or, in certain
cases  guaranteed by persons)  with  short-term  debt having such rating.  These
rating  categories  are described in the Appendix to the Statement of Additional
Information.  The Portfolio may also purchase unrated  commercial paper provided
that such paper is  determined to be of  comparable  quality by the  Portfolio's
investment adviser in accordance with guidelines approved by the Fund's Board of
Directors.

     Commercial paper purchased by the Portfolio may include  instruments issued
by foreign issuers,  such as Canadian  Commercial  Paper ("CCP"),  which is U.S.
dollar-denominated  commercial  paper  issued  by a  Canadian  corporation  or a
Canadian  counterpart  of a U.S.  corporation,  and in Europaper,  which is U.S.
dollar-denominated commercial paper of a foreign issuer, subject to the criteria
stated above for other commercial paper issuers.

     VARIABLE RATE DEMAND NOTES. The Portfolio may purchase variable rate demand
notes, which are unsecured  instruments that permit the indebtedness  thereunder
to vary and provide for periodic  adjustment in the interest rate.  Although the
notes are not normally traded and there may be no active secondary market in the
notes, the Portfolio will be able (at any time or during  specified  periods not
exceeding 13 months,  depending upon the note involved) to demand payment of the
principal  of a note.  The  notes  are not  typically  rated  by  credit  rating
agencies,  but  issuers of  variable  rate  demand  notes must  satisfy the same
criteria as set forth above for issuers of commercial  paper.  If an issuer of a
variable  rate demand note  defaulted on its payment  obligation,  the Portfolio
might be unable to  dispose  of the note  because  of the  absence  of an active
secondary market.  For this or other reasons,  the Portfolio might suffer a loss
to the extent of the  default.  The  Portfolio  invests in variable  rate demand
notes only when the  Portfolio's  investment  adviser  deems the  investment  to
involve  minimal credit risk. The Portfolio's  investment  adviser also monitors
the continuing  creditworthiness  of issuers of such notes to determine  whether
the Portfolio should continue to hold such notes.

                                       8


<PAGE>

     REPURCHASE AGREEMENTS.  The Portfolio may agree to purchase securities from
financial  institutions  subject to the seller's agreement to repurchase them at
an agreed-upon  time and price  ("repurchase  agreements").  The securities held
subject to a  repurchase  agreement  may have  stated  maturities  exceeding  13
months, provided the repurchase agreement itself matures in less than 13 months.
Default by or bankruptcy of the seller would,  however,  expose the Portfolio to
possible loss because of adverse market action or delays in connection  with the
disposition of the underlying obligations.

     U.S. GOVERNMENT OBLIGATIONS.  The Portfolio may purchase obligations issued
or  guaranteed  by the U.S.  Government  or its agencies and  instrumentalities.
Obligations of certain agencies and instrumentalities of the U.S. Government are
backed by the full faith and credit of the United  States.  Others are backed by
the right of the issuer to borrow  from the U.S.  Treasury or are backed only by
the credit of the agency or instrumentality issuing the obligation.

     ASSET-BACKED   SECURITIES.   The  Portfolio  may  invest  in   asset-backed
securities which are backed by mortgages,  installment  sales contracts,  credit
card  receivables  or  other  assets  and  collateralized  mortgage  obligations
("CMOs") issued or guaranteed by U.S. Government agencies and, instrumentalities
or issued by private companies.  Asset-backed securities also include adjustable
rate securities.  The estimated life of an asset-backed security varies with the
prepayment experience with respect to the underlying debt instruments.  For this
and other reasons, an asset-backed  security's stated maturity may be shortened,
and the  security's  total return may be difficult  to predict  precisely.  Such
difficulties  are not expected,  however,  to have a  significant  effect on the
Portfolio since the remaining  maturity of any  asset-backed  security  acquired
will be 13 months or less.  Asset-backed  securities  are considered an industry
for industry concentration purposes. See "Investment Limitations." In periods of
falling  interest  rates,  the rate of mortgage  prepayments  tends to increase.
During these periods the  reinvestment of proceeds by a Portfolio will generally
be at lower rates than the rates on the prepaid obligations.

     REVERSE  REPURCHASE  AGREEMENTS.  The  Portfolio  may  enter  into  reverse
repurchase agreements with respect to portfolio securities. A reverse repurchase
agreement   involves  a  sale  by  a  Portfolio  of  securities  that  it  holds
concurrently  with an agreement by the Portfolio to repurchase them at an agreed
upon time and price.  Reverse  repurchase  agreements  involve the risk that the
market value of the securities sold by the Portfolio may decline below the price
at which the  Portfolio is  obligated to  repurchase  them.  Reverse  repurchase
agreements are considered to be borrowings by the Portfolio under the Investment
Company Act of 1940 (the "1940 Act").

     MUNICIPAL  OBLIGATIONS.   In  addition,  the  Portfolio  may,  when  deemed
appropriate by its  investment  adviser in light of the  Portfolio's  investment
objective,  invest  without  limitation  in high quality,  short-term  Municipal
Obligations  issued by state and local  governmental  issuers,  the  interest on
which may be taxable or tax-exempt  for federal  income tax  purposes,  provided
that such  obligations  carry  yields that are  competitive  with those of other
types of Money Market  Instruments  of comparable  quality.  For a more complete
discussion of Municipal Obligations,  see "Investment Objectives and Policies --
Municipal Money Market Portfolio --Municipal Obligations."

     GUARANTEED  INVESTMENT  CONTRACTS.  The Portfolio may make  investments  in
obligations,  such  as  guaranteed  investment  contracts  and  similar  funding
agreements  (collectively,  "GICs"),  issued  by  highly  rated  U.S.  insurance
companies.  A GIC is a general  obligation of the issuing  insurance company and
not a separate account. The Portfolio's  investments in GICs are not expected to
exceed 5% of its total  assets at the time of  purchase  absent  unusual  market
conditions.   GIC  investments  are  subject  to  the  Fund's  policy  regarding
investment in illiquid securities.

     STAND-BY COMMITMENTS. The Portfolio may acquire "stand-by commitments" with
respect  to  Municipal  Obligations  held in its  portfolio.  Under  a  stand-by
commitment, a dealer would agree to purchase at the Portfolio's option specified
Municipal  Obligations  at a  specified  price.  The  acquisition  of a stand-by
commitment may increase the cost, and thereby reduce the yield, of the Municipal
Obligation to which such commitment relates. The Portfolio will acquire stand-by
commitments  solely to  facilitate  portfolio  liquidity  and does not intend to
exercise its rights thereunder for trading purposes.

                                       9

<PAGE>

     WHEN-ISSUED SECURITIES.  The Portfolio may purchase portfolio securities on
a  "when-issued"  basis.  When-issued  securities are  securities  purchased for
delivery  beyond the normal  settlement  date at a stated  price and yield.  The
Portfolio will generally not pay for such  securities or start earning  interest
on them until they are received. Securities purchased on a when-issued basis are
recorded as an asset at the time the  commitment is entered into and are subject
to changes in value prior to delivery based upon changes in the general level of
interest rates. The Portfolio  expects that commitments to purchase  when-issued
securities  will not exceed 25% of the value of its total assets absent  unusual
market  conditions.  The  Portfolio  does not  intend  to  purchase  when-issued
securities  for  speculative  purposes but only in furtherance of its investment
objective.

     ELIGIBLE SECURITIES. The Portfolio will only purchase "eligible securities"
that present  minimal credit risks as determined by the  Portfolio's  investment
adviser  pursuant  to  guidelines  adopted by the Board of  Directors.  Eligible
securities  generally include:  (1) U.S. Government  securities,  (2) securities
that are rated at the time of purchase in the two highest  rating  categories by
at least two Rating Organizations  ("Rating  Organizations")  (e.g.,  commercial
paper rated "A-1" or "A-2" by Standard & Poor's Ratings Services  ("S&P")),  (3)
securities  that  are  rated  at  the  time  of  purchase  by  the  only  Rating
Organization rating the security in one of its two highest rating categories for
such  securities  (4)  securities  issued  by  issuers  (or,  in  certain  cases
guaranteed  by  persons)  with  short-term  debt having  such  ratings,  and (5)
securities  that are not  rated and are  issued by an issuer  that does not have
comparable  obligations rated by a Rating Organization  ("Unrated  Securities"),
provided that such  securities  are  determined  to be of comparable  quality to
eligible  rated  securities.   For  a  more  complete  description  of  eligible
securities,  see  "Investment  Objectives  and  Policies"  in the  Statement  of
Additional Information.

     ILLIQUID SECURITIES. The Portfolio will not invest more than 10% of its net
assets in illiquid  securities,  including  repurchase  agreements  which have a
maturity of longer than seven days,  time deposits with  maturities in excess of
seven days,  variable  rate demand notes with demand  periods in excess of seven
days unless the Portfolio's  investment  adviser  determines that such notes are
readily  marketable  and could be sold  promptly at the prices at which they are
valued, GICs, and other securities that are illiquid by virtue of the absence of
a readily  available  market or legal or  contractual  restrictions  on  resale.
Repurchase  agreements  subject to demand are deemed to have a maturity equal to
the notice period.  Securities  that have legal or contractual  restrictions  on
resale but have a readily  available market are not deemed illiquid for purposes
of  this  limitation.  The  Portfolio's  investment  adviser  will  monitor  the
liquidity of such  restricted  securities  under the supervision of the Board of
Directors.  See "Investment  Objectives and Policies -- Illiquid  Securities" in
the Statement of Additional Information.

                        MUNICIPAL MONEY MARKET PORTFOLIO

     The Municipal Money Market Portfolio's  investment  objective is to provide
as high a level of current  interest  income exempt from federal income taxes as
is  consistent  with  maintaining  liquidity  and  stability of  principal.  The
Municipal Money Market Portfolio  invests  substantially  all of its assets in a
diversified  portfolio  of  short-term  Municipal  Obligations,  the interest on
which, in the opinion of bond counsel or counsel to the issuer,  as the case may
be, is exempt from the regular  federal  income  tax.  During  periods of normal
market conditions,  at least 80% of the net assets of the Municipal Money Market
Portfolio  will be  invested in  Municipal  Obligations.  Municipal  Obligations
include securities the interest on which is Tax-Exempt Interest, although to the
extent the  Portfolio  invests in certain  private  activity  bonds issued after
August 7, 1986 ("Alternative Minimum Tax Securities"), a portion of the interest
earned by the Portfolio may constitute an item of tax preference for purposes of
the federal alternative minimum tax ("AMT Interest"). There is no assurance that
the investment objective of the Portfolio will be achieved.

     MUNICIPAL  OBLIGATIONS.  The  Portfolio  invests  in  short-term  Municipal
Obligations  which are  determined  by the  Portfolio's  investment  adviser  to
present minimal credit risks and that meet certain ratings criteria  pursuant to
guidelines established by the Fund's Board of Directors.  The Portfolio may also
purchase Unrated Securities provided that

                                       10


<PAGE>

such  securities  are  determined to be of comparable  quality to eligible rated
securities.  The applicable  Municipal  Obligations ratings are described in the
Appendix to the Statement of Additional Information.

     The Portfolio may hold uninvested cash reserves pending  investment  during
temporary defensive periods or if, in the opinion of the Portfolio's  investment
adviser,  suitable  obligations  bearing Tax-Exempt Interest or AMT Interest are
unavailable. There is no percentage limitation on the amount of assets which may
be held uninvested during temporary defensive periods.  Uninvested cash reserves
will not earn income.

     The two principal  classifications  of Municipal  Obligations  are "general
obligation"  securities and "revenue" securities.  General obligation securities
are secured by the  issuer's  pledge of its full faith,  credit and taxing power
for the payment of principal and interest.  Revenue  securities are payable only
from the revenues derived from a particular  facility or class of facilities or,
in some  cases,  from the  proceeds  of a special  excise tax or other  specific
excise tax or other  specific  revenue  source such as the user of the  facility
being financed.  Revenue securities include private activity bonds which are not
payable from the unrestricted revenues of the issuer.  Consequently,  the credit
quality of private  activity  bonds is  usually  directly  related to the credit
standing of the corporate user of the facility involved.

     Municipal  Obligations may also include "moral obligation" bonds, which are
normally  issued by special purpose public  authorities.  If the issuer of moral
obligation  bonds is unable to meet its debt  service  obligations  from current
revenues,  it may draw on a reserve fund,  the  restoration  of which is a moral
commitment but not a legal obligation of the state or municipality which created
the issuer.

     Although the Municipal  Money Market  Portfolio may invest more than 25% of
its net assets in (i) Municipal Obligations whose issuers are in the same state,
(ii) Municipal Obligations the interest on which is paid solely from revenues of
similar projects and (iii) private activity bonds bearing  Tax-Exempt  Interest,
it does not  currently  intend to do so on a regular  basis.  To the  extent the
Municipal  Money  Market   Portfolio's  assets  are  concentrated  in  Municipal
Obligations that are payable from the revenues of similar projects or are issued
by  issuers  located in the same  state,  the  Portfolio  will be subject to the
peculiar risks  presented by the laws and economic  conditions  relating to such
states or projects  to a greater  extent than it would be if its assets were not
so concentrated.

     TAX-EXEMPT DERIVATIVE SECURITIES.  The Municipal Money Market Portfolio may
invest  in  tax-exempt  derivative  securities  such  as  tender  option  bonds,
custodial  receipts,   participations,   beneficial   interests  in  trusts  and
partnership  interests.  A typical tax-exempt  derivative  security involves the
purchase  of an  interest  in a pool of  Municipal  Obligations  which  interest
includes a tender  option,  demand or other  feature,  allowing the Portfolio to
tender  the  underlying  Municipal  Obligation  to a  third  party  at  periodic
intervals and to receive the principal amount thereof. In some cases,  Municipal
Obligations are represented by custodial  receipts  evidencing  rights to future
principal or interest payments, or both, on underlying municipal securities held
by a custodian  and such  receipts  include the option to tender the  underlying
securities  to the sponsor  (usually a bank,  broker-dealer  or other  financial
institution). Although the Internal Revenue Service has not ruled on whether the
interest  received  on  derivative  securities  in  the  form  of  participation
interests or custodial receipts is Tax-Exempt Interest, opinions relating to the
validity of, and the  tax-exempt  status of payments  received by, the Portfolio
from such  derivative  securities  are  rendered  by counsel  to the  respective
sponsors of such derivatives and relied upon by the Portfolio in purchasing such
securities.  Neither the  Portfolio nor its  investment  adviser will review the
proceedings relating to the creation of any tax-exempt  derivative securities or
the basis for such legal opinions.

     WHEN-ISSUED   SECURITIES.   The  Portfolio  may  also  purchase   portfolio
securities on a "when-issued"  basis as described under  "Investment  Objectives
and Policies--Money Market Portfolio--When-Issued Securities."

     STAND-BY COMMITMENTS. The Portfolio may acquire "stand-by commitments" with
respect to  Municipal  Obligations  held in its  portfolio  as  described  under
"Investment   Objectives   and   Policies--Money   Market    Portfolio--Stand-By
Commitments."

                                       11

<PAGE>

     ELIGIBLE  SECURITIES.  The  Municipal  Money  Market  Portfolio  will  only
purchase  "eligible  securities" that present minimal credit risks as determined
by the  Portfolio's  investment  adviser  pursuant to guidelines  adopted by the
Board of Directors. For a more complete description of eligible securities,  see
"Investment   Objectives   and   Policies--Money   Market    Portfolio--Eligible
Securities"  and  "Investment  Objectives  and  Policies"  in the  Statement  of
Additional Information.

     ILLIQUID SECURITIES. The Portfolio will not invest more than 10% of its net
assets in illiquid  securities as described  under  "Investment  Objectives  and
Policies--Money   Market   Portfolio--Illiquid   Securities"   and   "Investment
Objectives  and  Policies--Illiquid  Securities"  in the Statement of Additional
Information.

                  GOVERNMENT OBLIGATIONS MONEY MARKET PORTFOLIO

     The Government Obligations Money Market Portfolio's investment objective is
to provide  as high a level of current  interest  income as is  consistent  with
maintaining  liquidity  and  stability  of  principal.  It seeks to achieve such
objective  by investing  in  short-term  U.S.  Treasury  bills,  notes and other
obligations  issued or  guaranteed  by the U.S.  Government  or its  agencies or
instrumentalities,  and entering  into  repurchase  agreements  relating to such
obligations. The types of U.S. Government obligations in which the Portfolio may
invest  include a variety of U.S.  Treasury  obligations,  which  differ only in
their interest rates, maturities,  and times of issuance, and obligations issued
or  guaranteed  by the U.S.  Government  or its  agencies or  instrumentalities,
including  mortgage-related  securities.  Obligations  of certain  agencies  and
instrumentalities  of the  U.S.  Government,  such  as the  Government  National
Mortgage  Association  and the  Export-Import  Bank of the  United  States,  are
supported  by the full faith and credit of the U.S.  Treasury;  others,  such as
those of the Federal National Mortgage  Association,  are supported by the right
of the  issuer  to  borrow  from  the  Treasury;  others  are  supported  by the
discretionary  authority  of  the  U.S.  Government  to  purchase  the  agency's
obligations; still others, such as those of the Federal Farm Credit Banks or the
Federal Home Loan Mortgage Corporation,  are supported only by the credit of the
instrumentality.  No  assurance  can be given  that the  U.S.  Government  would
provide   financial   support   to   U.S.   Government-sponsored   agencies   or
instrumentalities  if it is not obligated to do so under law. The Portfolio will
invest in the  obligations of such agencies or  instrumentalities  only when the
investment  adviser  believes  that the  credit  risk with  respect  thereto  is
minimal.  There is no assurance that the  investment  objective of the Portfolio
will be achieved.

     Due to  fluctuations  in interest  rates,  the market  values of securities
issued or guaranteed by the U.S. Government,  its agencies and instrumentalities
may vary. Certain government securities held by the Portfolio may have remaining
maturities  exceeding 397 days if such  securities  provide for  adjustments  in
their interest rates not less frequently than every 397 days and the adjustments
are sufficient to cause the securities to have market values,  after adjustment,
which approximate their par values.

     REPURCHASE  AGREEMENTS.  The  Portfolio  may agree to  purchase  government
securities  from financial  institutions,  subject to the seller's  agreement to
repurchase them at an agreed-upon time and price ("repurchase agreements").  For
a more complete description of repurchase agreements, see "Investment Objectives
and Policies--Money Market Portfolio--Repurchase Agreements."

     REVERSE REPURCHASE  AGREEMENTS.  The Portfolio may borrow funds by entering
into  reverse   repurchase   agreements  in  accordance   with  the   investment
restrictions described below. The Portfolio would consider entering into reverse
repurchase  agreements to avoid otherwise selling  securities during unfavorable
market  conditions  to meet  redemptions.  For a more  complete  description  of
reverse  repurchase  agreements see "Investment  Objectives and  Policies--Money
Market Portfolio--Reverse Repurchase Agreements."

     MORTGAGE-RELATED AND ASSET-BACKED SECURITIES.  Mortgage-related  securities
consist of mortgage loans which are assembled into pools, the interests in which
are  issued  and  guaranteed  by  an  agency  or  instrumentality  of  the  U.S.
Government,  though not necessarily by the U.S.  Government itself. The Fund may
also acquire asset-backed  securities as described under "Investment  Objectives
and Policies--Money Market Portfolio--Asset-Backed Securities."

                                       12

<PAGE>

     LENDING OF SECURITIES. The Portfolio may also lend its portfolio securities
to  financial  institutions  in  accordance  with  the  investment  restrictions
described below. Such loans would involve risks of delay in receiving additional
collateral in the event the value of the collateral decreased below the value of
the securities  loaned or of delay in recovering  the securities  loaned or even
loss of rights in the  collateral  should the  borrower of the  securities  fail
financially.  However,  loans  will be  made  only to  borrowers  deemed  by the
Portfolio's  investment  adviser to be of good  standing  and only when,  in the
adviser's  judgment,  the  income to be  earned  from the  loans  justifies  the
attendant  risks.  Any  loans  of  the  Portfolio's  securities  will  be  fully
collateralized and marked to market daily.

     ILLIQUID SECURITIES. The Portfolio will not invest more than 10% of its net
assets in illiquid  securities as described  under  "Investment  Objectives  and
Policies--Illiquid Securities" in the Statement of Additional Information.

YEAR 2000
- --------------------------------------------------------------------------------
     Like  other  mutual  funds,   financial  and  business   organizations  and
individuals  around  the  world,  the Fund could be  adversely  affected  if the
computer systems used by the Adviser and the Fund's other service providers,  or
persons with whom they deal, do not properly process and calculate  date-related
information  and data  from and after  January  1,  2000.  This  possibility  is
commonly known as the "Year 2000 Problem." The Year 2000 Problem could also hurt
companies whose securities the Fund holds or securities markets  generally.  The
Fund has been advised by the Adviser,  the Administrators and the Custodian that
they are actively  taking steps to address the Year 2000 Problem with respect to
the computer  systems  that they use and to obtain  assurances  that  comparable
steps are being taken by the Fund's other major service  providers.  While there
can be no  assurance  that  the  Fund's  service  providers  will be  Year  2000
compliant,  the Fund's service providers expect that their plans to be compliant
will be achieved.

INVESTMENT LIMITATIONS
- --------------------------------------------------------------------------------
     The Money Market,  Municipal Money Market and Government  Obligations Money
Market Portfolios'  respective  investment objectives and the policies described
above may be  changed  by the  Fund's  Board of  Directors  without  shareholder
approval.  The  Portfolios  may not,  however,  change the following  investment
limitations   (except  as  noted)  without  such  a  vote  of  their  respective
shareholders.   (A  more  detailed   description  of  the  following  investment
limitations,  together with other investment  limitations that cannot be changed
without a vote of  shareholders,  is  contained in the  Statement of  Additional
Information under "Investment Objectives and Policies.")

     The  Portfolios  may not borrow  money,  except  from  banks for  temporary
purposes and except for reverse repurchase  agreements,  and then in amounts not
in  excess  of 10% of the  value  of a  Portfolio's  assets  at the time of such
borrowing,  and only if after such borrowing there is asset coverage of at least
300% for all borrowings of the Portfolio; or mortgage, pledge or hypothecate any
of its assets except in connection with any such borrowing and in amounts not in
excess  of 10% of the  value  of a  Portfolio's  assets  at  the  time  of  such
borrowing;  or purchase portfolio securities while borrowings in excess of 5% of
the Portfolio's net assets are outstanding. (This borrowing provision is not for
investment  leverage,  but  solely to  facilitate  management  of a  Portfolio's
securities  by enabling the  Portfolio  to meet  redemption  requests  where the
liquidation  of  portfolio   securities  is  deemed  to  be  disadvantageous  or
inconvenient.)

     The Money Market and Municipal Money Market Portfolios may not:

         1. Purchase securities of any one issuer,  other than securities issued
     or guaranteed by the U.S. Government or its agencies and instrumentalities,
     if  immediately  after and as a result of such purchase more than 5% of the
     value of its total  assets  would be  invested  in the  securities  of such
     issuer,  or more  than 10% of the  outstanding  voting  securities  of such
     issuer would be owned by a Portfolio, except that up to 25% of the value of
     a  Portfolio's  total  assets  may be  invested  without  regard to such 5%
     limitation.

                                       13

<PAGE>

The Money Market Portfolio may not:

         1. Purchase any securities other than Money Market Instruments, some of
     which may be subject to repurchase  agreements,  but the Portfolio may make
     interest-bearing  savings  deposits  in amounts  not in excess of 5% of the
     value of the Portfolio's assets and may make time deposits.

         2. Purchase any securities  which would cause, at the time of purchase,
     less  than 25% of the  value of the total  assets  of the  Portfolio  to be
     invested  in the  obligations  of issuers in the  banking  industry,  or in
     obligations,  such as repurchase  agreements,  secured by such  obligations
     (unless the Portfolio is in a temporary  defensive position) or which would
     cause,  at the time of  purchase,  more  than 25% of the value of its total
     assets to be invested in the obligations of issuers in any other industry.

     So long as it values its portfolio securities on the basis of the amortized
cost method of  valuation  pursuant  to Rule 2a-7 under the 1940 Act,  the Money
Market  Portfolio  will meet the following  limitations  on its  investments  in
addition  to the  fundamental  investment  limitations  described  above.  These
limitations  may be changed  without a vote of  shareholders of the Money Market
Portfolio.

         1.  The  Money  Market  Portfolio  will  limit  its  purchases  of  the
     securities  of any one  issuer,  other  than  issuers  of  U.S.  Government
     securities,  to 5% of its  total  assets,  except  that  the  Money  Market
     Portfolio  may  invest  more  than 5% of its  total  assets  in First  Tier
     Securities  of one  issuer  for a period of up to three  Business  Days (as
     defined below).  "First Tier Securities"  include eligible  securities that
     (i) if rated by more than one Rating  Organization,  are rated (at the time
     of  purchase)  by two or more Rating  Organizations  in the highest  rating
     category   for  such   securities,   (ii)  if  rated  by  only  one  Rating
     Organization,  are rated by such Rating  Organization in its highest rating
     category  for such  securities,  (iii)  have no  short-term  rating and are
     comparable in priority and security to a class of short-term obligations of
     the issuer of such  securities  that have been rated in accordance with (i)
     or (ii) above, or (iv) are Unrated  Securities that are determined to be of
     comparable  quality to such securities.  Purchases of First Tier Securities
     that  come  within  categories  (ii) and (iv)  above  will be  approved  or
     ratified by the Board of Directors.

         2. The Money Market  Portfolio  will limit its purchases of Second Tier
     Securities, which are eligible securities other than First Tier Securities,
     to 5% of its total assets.

         3. The Money Market  Portfolio  will limit its purchases of Second Tier
     Securities  of one issuer to the  greater  of 1% of its total  assets or $1
     million.

     The Municipal Money Market Portfolio may not:

         1. Purchase any securities which would cause more than 25% of the value
     of the total assets of the Portfolio to be invested in  obligations  at the
     time of purchase in issuers in the same industry.

In addition,  without  shareholder  approval,  the  Portfolio may not change its
policy of investing  during  normal  market  conditions  at least 80% of its net
assets in  obligations  the  interest  on which is  Tax-Exempt  Interest  or AMT
Interest.

     The Government Obligations Money Market Portfolio may not:

         1. Purchase  securities other than U.S. Treasury bills, notes and other
     obligations  issued or guaranteed by the U.S.  Government,  its agencies or
     instrumentalities, and repurchase agreements relating to such obligations.

         2. Make loans  except  that the  Portfolio  may  purchase  or hold debt
     obligations  in  accordance  with its  investment  objective,  policies and
     limitations,  may enter into repurchase agreements for securities,  and may
     lend  portfolio  securities  against  collateral,  consisting  of  cash  or
     securities which are consistent with the Portfolio's permitted investments,
     which is equal at all times to at least 100% of the value of the securities
     loaned. There is no investment restriction on the amount of securities that
     may be loaned,  except that  payments  received  on such  loans,  including
     amounts  received  during the loan on account of interest on the securities
     loaned, may not

                                       14

<PAGE>

     (together with all  non-qualifying  income)  exceed 10% of the  Portfolio's
     annual gross income (without offset for realized capital gains) unless,  in
     the  opinion of counsel to the Fund,  such  amounts are  qualifying  income
     under federal  income tax  provisions  applicable  to regulated  investment
     companies.

PURCHASE AND REDEMPTION OF SHARES
- --------------------------------------------------------------------------------

                               PURCHASE PROCEDURES

     Sansom Street Shares are sold without a sales load on a continuous basis by
the Fund's  Distributor.  Only Shares of the Sansom  Street  Class  representing
interests in the Money Market  Portfolio  are  currently  offered to the public.
Purchase  of Shares  may be made  through  the  Banks  acting on behalf of their
customers,  including  individuals,  trusts,  partnerships  and corporations who
maintain accounts (such as custody, trust or escrow accounts) with the Banks and
who have  authorized  the Bank to invest in the Fund on the  customer's  behalf.
Investors may also purchase Shares through broker-dealers (a "Dealer") that have
entered into a dealer agreement with the Fund's Distributor. The minimum initial
investment by an investor is $1,500. There is no minimum subsequent investment.

     Purchases of Shares may be effected through the customer's  accounts at the
Banks or investor  accounts with the Dealer  through  procedures  established in
connection  with the  requirements  of accounts at the Banks or at such  Dealer.
Confirmations  of Share purchases and  redemptions  will be sent to the Banks or
such Dealer.  Beneficial  ownership of Sansom  Street Shares will be recorded by
the Banks or such Dealer and  reflected  in the account  statements  provided by
such Banks or by such Dealer to investors. If you wish to purchase Sansom Street
Shares, contact your Bank or a Dealer.

     The Banks may also impose minimum customer account  requirements.  Although
the Banks do not impose a sales charge for  purchases of Sansom  Street  Shares,
depending  upon the  terms of the  particular  customer  account,  the Banks may
charge the  account  fees for  automatic  investment  and other cash  management
services.  Information  concerning these minimum account requirements,  services
and any charges will be provided by the Banks before the customer authorizes the
initial purchase of shares.  This Prospectus  should be read in conjunction with
any information received from the Banks. See "Shareholder Servicing."

     The Sansom  Street  Class of the Money Market  Portfolio is also  available
through Robertson Stephens,  a registered  broker-dealer that has entered into a
dealer Agreement with the Fund's  Distributor.  For  distribution  services with
respect to that Class of shares of the Portfolio  held by this firm,  the Fund's
Distributor  pays Robertson  Stephens up to .25% of the average annual daily net
asset value of such  accounts.  Purchases  made  through  this  program does not
require customers to pay a transaction fee.

     DIRECT  PURCHASES  THROUGH  A  DEALER.  An  investor  may  make an  initial
investment by mail by fully completing and signing an application  obtained from
a Dealer (an  "Application")  and mailing it,  together  with a check payable to
"Sansom Street Money  Market," to "Sansom  Street Money Market," c/o PFPC,  P.O.
Box 8950,  Wilmington,  Delaware 19899.  An Application  will be returned to the
investor  unless it contains  the name of the Dealer from whom it was  obtained.
Subsequent  purchases may be made through a Dealer or by  forwarding  payment to
the Fund's transfer agent at the foregoing address.

     The Fund reserves the right to reject any purchase order.

     All  payments  for initial  and  subsequent  investments  should be in U.S.
dollars. Purchases will be effected at the net asset value next determined after
receipt of the purchase  order in good order and Federal  Funds are available to
the Fund. Purchase orders received after its close of business are priced at the
net asset value next  determined  on the following  "Business  Day." A "Business
Day" is any day that  both the New York  Stock  Exchange  (the  "NYSE")  and the
Federal  Reserve Bank of  Philadelphia  (the "FRB") are open.  In those cases in
which an investor pays for Shares by check,

                                       15

<PAGE>

Federal Funds will generally  become available two Business Days after the check
is received. Purchase orders for Shares are accepted only on Business Days.

     Conflict of interest  restrictions may apply to an institution's receipt of
compensation  paid by the Fund in  connection  with the  investment of fiduciary
funds in Sansom Street Shares.  Institutions,  including  banks regulated by the
Comptroller  of the Currency and  investment  advisers and other money  managers
subject to the  jurisdiction  of the  Securities  and Exchange  Commission,  the
Department of Labor or state securities commissions,  are urged to consult their
legal advisers before investing fiduciary funds in Sansom Street Shares.

                              REDEMPTION OF SHARES

     Redemption  orders  are  effected  at the net asset  value  per share  next
determined  after  receipt of the order in proper  form by the  Fund's  transfer
agent,  PFPC. It is the  responsibility of the Banks and the Dealers to transmit
promptly to PFPC a customer's  redemption  request.  In the case of shareholders
holding share  certificates,  the  certificates  must  accompany the  redemption
request. Investors may redeem all or some of their Shares in accordance with one
of the procedures described below.

     REDEMPTION  OF SHARES IN AN ACCOUNT  FOR BANK  CUSTOMERS.  A  customer  may
redeem all or part of his Sansom Street Shares in accordance  with  instructions
and  limitations  pertaining to his account at the Bank.  Redemption  orders are
effected at the net asset value per share  determined after receipt of the order
by PFPC. Payment for redemption orders received by PFPC on a Business Day before
12:00  noon  Eastern  Time  will be wired the same day in  Federal  Funds to the
(customer's) account at the Bank, provided that the Fund's custodian is open for
business.  If the  custodian is not open,  payment will be made on the next bank
business day.  Payment for  redemption  orders which are received  between 12:00
noon Eastern Time and the close of regular  trading on the NYSE  (generally 4:00
p.m.  Eastern  Time) on a  Business  Day will be wired in  Federal  Funds to the
customers  account  on the next  bank  business  day  following  receipt  of the
redemption  request.  No charge for wiring redemption payments is imposed by the
Fund, although the Banks may charge customer accounts for redemption services.

     REDEMPTION OF SHARES IN AN ACCOUNT FOR NON-BANK CUSTOMERS.  An investor who
beneficially  owns Shares through an Account may redeem Shares in his account in
accordance  with  instructions  and  limitations  pertaining  to his  Account by
contacting  his  broker.  If such  notice is received by PFPC from the broker by
12:00 noon Eastern Time on any Business Day, the redemption will be effective as
of 12:00 noon Eastern Time on that day. Payment of the redemption  proceeds will
be made after 12:00 noon  Eastern  Time on the day the  redemption  is effected,
provided that the Fund's custodian is open for business. If the custodian is not
open,  payment  will be made on the next bank  business  day. If the  redemption
request is received  between 12:00 noon and the close of regular  trading of the
NYSE on a Business  Day,  the  redemption  will be  effective as of the close of
regular trading of the NYSE on such Business Day and payment will be made on the
next bank  business day  following  receipt of the  redemption  request.  If all
Shares are  redeemed,  all accrued but unpaid  dividends on those Shares will be
paid with the redemption proceeds.

     An investor's  brokerage firm may also redeem each day a sufficient  number
of Shares to cover  debit  balances  created by  transactions  in the Account or
instructions  for cash  disbursements.  Shares  will be redeemed on the same day
that a transaction occurs that results in such a debit-balance or charge.

     Each  brokerage  firm  reserves  the right to waive or modify  criteria for
participation in an Account or to terminate  participation in an Account for any
reason.

     REDEMPTION  OF SHARES  OWNED  DIRECTLY.  A direct  investor  may redeem any
number of Shares by sending a written  request to "Sansom  Street Money Market,"
c/o PFPC, P.O. Box 8950, Wilmington, Delaware 19899. It is recommended that such
request be sent by registered or certified mail if share certificates  accompany
the request.  Redemption requests must be signed by each shareholder in the same
manner as the Shares are  registered.  Redemption  requests  for joint  accounts
require the signature of each joint owner.  On redemption  requests of $5,000 or
more, a signature

                                       16

<PAGE>

guarantee is required.  A signature  guarantee  may be obtained  from a domestic
bank or trust company,  broker,  dealer,  clearing agency or savings association
who  are  participants  in a  medallion  program  recognized  by the  Securities
Transfer  Association.  The three recognized  medallion  programs are Securities
Transfer Agents Medallion  Program (STAMP),  Stock Exchanges  Medallion  Program
(SEMP) and New York Stock  Exchange,  Inc.  Medallion  Signature  Program (MSP).
Signature guarantees that are not part of these programs will not be accepted.

     Direct investors may redeem Shares without charge by telephone if they have
completed  and  returned  an  account  application  containing  the  appropriate
telephone  election.  To add a  telephone  option to an  existing  account  that
previously did not provide for this option, a Telephone  Authorization Form must
be filed with PFPC.  This form is available  from PFPC.  Once this  election has
been made, the  shareholder  may simply contact PFPC by telephone to request the
redemption by calling (888)  261-4073.  Neither the Fund,  the  Portfolios,  the
Distributor,  PFPC  nor any  other  Fund  agent  will be  liable  for any  loss,
liability,  cost or expense for following the procedures  described below or for
following instructions communicated by telephone that they reasonably believe to
be genuine.

     The Fund's telephone transaction procedures include the following measures:
(1)  requiring  the  appropriate  telephone  transaction  privilege  forms;  (2)
requiring  the caller to provide  the names of the account  owners,  the account
social  security  number and the name of the portfolio,  all of which must match
the Fund's records; (3) requiring the Fund's service  representative to complete
a telephone  transaction  form,  listing all of the above caller  identification
information; (4) requiring that redemption proceeds be sent only by check to the
account owners of record at the address of record, or by wire only to the owners
of record at the bank account of record; (5) sending a written  confirmation for
each  telephone  transaction  to the  owners of record at the  address of record
within  five  (5)  business  days of the  call;  and (6)  maintaining  tapes  of
telephone  transactions for six months, if the Fund elects to record shareholder
telephone  transactions.  For accounts held of record by  broker-dealers  (other
than the Distributor),  financial  institutions,  securities dealers,  financial
planners  or  other  industry   professionals,   additional   documentation   or
information  regarding the scope of a caller's  authority is required.  Finally,
for telephone  transactions  in accounts held  jointly,  additional  information
regarding other account holders is required.  Telephone transactions will not be
permitted in  connection  with IRA or other  retirement  plan  accounts or by an
attorney-in-fact under power of attorney.

     The proceeds of a telephone  redemption  request will be mailed by check to
an investor's  registered address unless he has designated in his Application or
Telephone  Authorization Form that such proceeds are to be sent by wire transfer
to a specified  checking or savings account.  If proceeds are to be sent by wire
transfer,  a telephone redemption request received prior to the close of regular
trading  on the NYSE  will  result in  redemption  proceeds  being  wired to the
investor's  bank account on the next bank business  day. The minimum  redemption
for proceeds sent by wire  transfer is $2,500.  There is no maximum for proceeds
sent by wire transfer.  The Fund may modify this redemption  service at any time
or charge a service fee upon prior  notice to  shareholders,  although no fee is
currently contemplated.

     REDEMPTION  BY CHECK.  Upon  request,  the Fund  will  provide  any  direct
investor  and any investor who does not have check  writing  privileges  for his
Account with forms of drafts  ("checks")  payable through PNC Bank. These checks
may be made  payable to the order of anyone.  The  minimum  amount of a check is
$100;  however, a broker may establish a higher minimum.  An investor wishing to
use this check writing  redemption  procedure should complete specimen signature
cards (available from PFPC), and then forward such signature cards to PFPC. PFPC
will then  arrange for the checks to be honored by PNC Bank.  Investors  who own
Shares  through an Account  should  contact their  brokers for signature  cards.
Investors  with joint  accounts  may elect to have checks  honored with a single
signature.  Check  redemptions  will be subject to PNC  Bank's  rules  governing
checks. An investor will be able to stop payment on a check redemption. The Fund
or PNC Bank may terminate this redemption service at any time, and neither shall
incur any  liability  for honoring  checks,  for  effecting  redemptions  to pay
checks, or for returning checks which have not been accepted.

     When a check is  presented  to PNC Bank for  clearance,  PNC  Bank,  as the
investor's  agent, will cause the Fund to redeem a sufficient number of full and
fractional  Shares owned by the investor to cover the amount of the check.  This
procedure  enables the investor to continue to receive dividends on those Shares
representing the amount being

                                       17

<PAGE>

redeemed  by check  until  such  time as the  check is  presented  to PNC  Bank.
Pursuant  to rules  under the 1940 Act,  checks  may not be  presented  for cash
payment at the offices of PNC Bank.  This limitation does not affect checks used
for the payment of bills or cash at other banks.

                          OTHER REDEMPTION INFORMATION

     The Fund  ordinarily will make payment for all Shares redeemed within seven
days after  receipt  by the Fund's  transfer  agent of a  redemption  request in
proper form.  Although the Fund will redeem Shares purchased by check before the
check clears,  payment of redemption  proceeds may be delayed for a period up to
fifteen days after their purchase,  pending a  determination  that the check has
cleared.  This  procedure  does not apply to Shares  purchased by wire  payment.
Investors should consider  purchasing  Shares using a certified or bank check or
money order if they anticipate an immediate need for redemption proceeds.

     The Fund imposes no charge when Shares are redeemed.  The Fund reserves the
right to redeem any account in a Sansom  Street Class  involuntarily,  on thirty
days' notice, if such account falls below $500 and during such thirty-day notice
period the amount  invested in such  account is not  increased to at least $500.
Payment  for  Shares  redeemed  may be  postponed  or the  right  of  redemption
suspended as provided by the rules of the Securities and Exchange Commission.

NET ASSET VALUE
- --------------------------------------------------------------------------------
     The net  asset  value  per share of each  class of the  Portfolios  for the
purpose of pricing purchase and redemption  orders is determined twice each day,
once as of 12:00 noon Eastern  Time and once as of the close of regular  trading
on the NYSE on each  weekday,  with the  exception  of those  holidays  on which
either the NYSE or the FRB is closed.  Currently, the NYSE is closed on weekends
and the  customary  national  business  holidays of New Year's Day,  Dr.  Martin
Luther King, Jr. Day, Presidents' Day, Good Friday,  Memorial Day,  Independence
Day, Labor Day,  Thanksgiving  Day and Christmas Day and on the preceding Friday
or subsequent  Monday when one of these  holidays falls on a Saturday or Sunday.
The FRB is  currently  closed on weekends  and the same  holidays as the NYSE is
closed, as well as Veterans' Day and Columbus Day. The net asset value per share
of each class is calculated by adding the  proportionate  interest of each class
in the  value of the  securities,  cash,  and  other  assets  of the  Portfolio,
subtracting  accrued and actual liabilities of the class and dividing the result
by the number of outstanding  shares of the class. The net asset value per share
of each class of the Fund is determined independently of any of the Fund's other
classes.

     The Fund seeks to maintain for each of the  Portfolios a net asset value of
$1.00 per share for  purposes  of  purchases  and  redemptions  and  values  its
portfolio  securities  on the basis of the  amortized  cost method of  valuation
described  in  the  Statement  of  Additional   Information  under  the  heading
"Valuation of Shares."  There can be no assurance that net asset value per share
will not vary.

     With the approval of the Board of Directors,  a Portfolio may use a pricing
service,  bank  or  broker-dealer  experienced  in such  matters  to  value  the
Portfolio's  securities.  A more  detailed  discussion  of net  asset  value and
security valuation is contained in the Statement of Additional Information.

DISTRIBUTION OF SHARES
- --------------------------------------------------------------------------------
     Provident  Distributors,  Inc. acts as  distributor  for each of the Sansom
Street  Classes of the Fund pursuant to a  distribution  agreement with the Fund
dated May 29, 1998 (the "Distribution Agreement").  The Distributor pays for the
cost of printing  (excluding  typesetting) and mailing to prospective  investors
prospectuses and other materials  relating to the Portfolios of the Fund as well
as for related direct mail,  advertising expenses and promotional expenses.  The
Distributor  monitors the support services provided by the Banks as described in
"Shareholder Servicing" below.

                                       18

<PAGE>

DISTRIBUTION ARRANGEMENTS

     The Board of  Directors of the Fund  approved and adopted the  Distribution
Agreement  and  separate  Plans of  Distribution  for each of the Sansom  Street
Classes  (collectively,  the "Plans") pursuant to Rule 12b-1 under the 1940 Act.
Under  each of the Plans,  the  Distributor  is  entitled  to  receive  from the
relevant Sansom Street Class a distribution fee, which is accrued daily and paid
monthly,  of up to .20% on an  annualized  basis of the daily net  assets of the
relevant Sansom Street Class. The actual amount of such  compensation  under the
Plans is agreed upon by the Fund's  Board of Directors  and by the  Distributor.
Under the  Distribution  Agreement for the Municipal Money Market  Portfolio and
the Government Obligations Money Market Portfolio, the Distributor has agreed to
accept  compensation for its services  thereunder and under the relevant Plan in
the amount of .05% on an annualized basis. Such compensation may be increased up
to the amount permitted under the Plan, with the approval of the Fund's Board of
Directors.  Under the Distribution Agreement for the Money Market Portfolio, the
Distributor has agreed to accept  compensation  for its services  thereunder and
under the relevant Plan in the amount of .06% on an annualized  basis.  Pursuant
to the  conditions of an exemptive  order granted by the Securities and Exchange
Commission, the Distributor has agreed to waive its fee with respect to a Sansom
Street Class on any day to the extent  necessary to assure that the fee required
to be  accrued  by such  Class  does not exceed the income of such Class on that
day. In addition, the Distributor may, in its discretion, voluntarily waive from
time to time all or any portion of its distribution fee.

     Each of the Plans obligates the Fund, during the period it is in effect, to
accrue and pay to the  Distributor on behalf of each Sansom Street Class the fee
set forth  above.  Payments  under the Plans are not based on expenses  actually
incurred by the Distributor,  and the payments may exceed distribution  expenses
actually incurred.

SHAREHOLDER SERVICING
- --------------------------------------------------------------------------------
     The Fund has adopted a Shareholder  Servicing Plan on behalf of the Classes
under  which the Fund may enter  into  service  agreements  with the  Banks.  As
compensation for their services under these  agreements,  the Plan provides that
Banks may receive up to .20% (on an  annualized  basis) of the average daily net
asset value of such Shares. The Fund has and will continue to enter into service
agreements  with the  Banks  pursuant  to which the Banks  will  render  certain
support  services  to  customers  in  consideration  for  payment of .10% (on an
annualized  basis) of the  average  daily net asset value of such  Shares.  Such
services may include aggregating and processing purchase and redemption requests
from  customers  and  placing  net  purchase  and  redemption  orders with PFPC;
processing  dividend  payments from the Fund on behalf of  customers;  providing
information  periodically  to customers  showing  their  positions in the Sansom
Street  Classes;  providing  sub-accounting  with  respect to the Sansom  Street
Shares  beneficially  owned  by  customers  or  the  information  necessary  for
sub-accounting;  and providing certain statistical and factual  information.  In
accordance  with the conditions of an exemptive  order granted by the Securities
and Exchange  Commission,  each service  agreement will provide that a Bank will
waive its  servicing fee with respect to a Sansom Street Class on any day to the
extent necessary to assure that the servicing fee required to be accrued by such
Class does not exceed  the income of such Class on that day.  Customers  who are
beneficial  owners of Sansom Street Shares should read this  Prospectus in light
of the terms governing their accounts with the Banks.  For the fiscal year ended
August 31, 1998, the Fund paid PNC Bank  shareholder  services fees  aggregating
 .10% of the average  daily net assets of the Money  Market  Portfolio  under the
Plan.

MANAGEMENT
- --------------------------------------------------------------------------------
BOARD OF DIRECTORS

     The  business  and affairs of the Fund and each  investment  portfolio  are
managed under the direction of the Fund's Board of Directors. The Fund currently
operates or proposes to operate seventeen investment portfolios. Each of the

                                       19


<PAGE>

Sansom Street Classes represents  interests in one of the following  portfolios:
the Money  Market  Portfolio,  the  Municipal  Money  Market  Portfolio  and the
Government Obligations Money Market Portfolio.

INVESTMENT ADVISER

     BIMC,  an indirect  majority-owned  subsidiary  of PNC Bank,  serves as the
investment adviser for each of the Portfolios. BIMC has its principal offices at
Bellevue Park  Corporate  Center,  400 Bellevue  Parkway,  Wilmington,  Delaware
19809.  PNC Bank and its  subsidiaries  currently  manage over $45.9  billion of
assets,  of which  approximately  $31.4  billion are mutual  funds.  PNC Bank, a
national  bank  whose  principal   business   address  is  1600  Market  Street,
Philadelphia,  Pennsylvania  19103, is a wholly-owned  subsidiary of PNC Bancorp
Inc. PNC Bancorp, Inc., is a bank holding company and a wholly-owned  subsidiary
of PNC Bank Corp., a multi-bank holding company.

     As investment  adviser to the Portfolios,  BIMC manages such Portfolios and
is responsible for all purchases and sales of portfolio securities.  In entering
into Portfolio  transactions  for a Portfolio with a broker,  BIMC may take into
account  the  sale  by  such  broker  of  shares  of the  Fund,  subject  to the
requirements  of best  execution.  The  agreements  between  BIMC and RBB,  with
respect to the Money Market and Government  Obligations Money Market Portfolios,
respectively,  provide  for BIMC to also assist  generally  in  supervising  the
operations  of such  Portfolios,  and to  maintain  such  Portfolios'  financial
accounts and records. These administrative  responsibilities have been delegated
to PFPC, as described below.

     For the services  provided to and expenses assumed by it for the benefit of
each of the Money Market and  Government  Obligations  Money Market  Portfolios,
BIMC is entitled  to receive  the  following  fees,  computed  daily and payable
monthly based on a Portfolio's  average daily net assets: .45% of the first $250
million;  .40% of the next  $250  million;  and .35% of assets in excess of $500
million.  For the services  provided and expenses  assumed by it with respect to
the Municipal Money Market Portfolio,  BIMC is entitled to receive the following
fees,  computed daily and payable monthly based on the Portfolio's average daily
net assets: .35% of the first $250 million;  .30% of the next $250 million;  and
 .25% of net assets in excess of $500 million.  BIMC may in its  discretion  from
time to time agree to waive  voluntarily  all or any portion of its advisory fee
for any Portfolio.

     For the  fiscal  year  ended  August  31,  1998,  the Fund paid  investment
advisory  fees  aggregating  .24% of the average net assets of the Money  Market
Portfolio. For the same period BIMC waived approximately .13% of the average net
assets of the Money Market Portfolio.

     PNC Bank was formerly  sub-adviser  to the Money  Market,  Municipal  Money
Market and  Government  Obligations  Portfolios  and provided  research,  credit
analysis and recommendations  with respect to each such Portfolio's  investments
and supplied  certain  computer  facilities,  personnel and other services.  The
facilities,  personnel,  services and related  expenses have been transferred to
BIMC and in return,  BIMC's  obligation to pay a portion of the sub-advisory fee
to PNC Bank has been  terminated.  For its sub-advisory  services,  PNC Bank was
entitled to receive from BIMC an amount equal to 75% of the investment  advisory
fee paid by each such Portfolio to BIMC. The  sub-advisory  fees paid by BIMC to
PNC  Bank  had no  effect  on the  investment  advisory  fees  payable  by  such
Portfolios  to BIMC.  The services  provided by BIMC and the fees payable by the
Portfolio  for  these  services  are  described  further  in  the  Statement  of
Additional Information under "Management of the Company."

ADMINISTRATOR

     PFPC serves as the  administrator for the Municipal Money Market Portfolios
and  generally  assists the Portfolio in all aspects of its  administration  and
operations,  including  matters relating to the maintenance of financial records
and accounting.  PFPC is entitled to an  administration  fee, computed daily and
payable  monthly  at .10% of the  average  daily net  assets  of the  Portfolio.
Pursuant  to its  advisory  agreements  with the Fund with  respect to the Money
Market  and  Government  Obligations  Money  Market  Portfolios,  BIMC  provides
administrative services to such Portfolios pursuant

                                       20

<PAGE>

to the  same  terms,  but  has  delegated  to  PFPC  all of its  accounting  and
administrative  obligations under such advisory agreements.  The Fund has agreed
to pay directly to PFPC the fees for accounting and  administrative  services to
the Money Market and Government  Obligations  Money Market Portfolios which PFPC
would have received  directly from BIMC.  Such  arrangement has no effect on the
total  advisory  and  administrative  fees payable by such  Portfolios  to BIMC.
PFPC's principal business address is 400 Bellevue Parkway, Wilmington,  Delaware
19809.

TRANSFER AGENT, DIVIDEND DISBURSING AGENT, AND CUSTODIAN

     PFPC Trust Company, an indirect wholly-owned  subsidiary of PNC Bank Corp.,
will succeed PNC Bank, National Association ("PNC Bank") as the Fund's custodian
pursuant to an assignment. PNC Bank will continue to provide certain services to
PFPC Trust  Company.  PFPC  serves as the  Fund's  transfer  agent and  dividend
disbursing  agent.  The  principal  offices of PFPC are located at 400  Bellevue
Parkway,  Wilmington,  Delaware 19809. PFPC may enter into shareholder servicing
agreements  with  registered   broker-dealers   who  have  entered  into  dealer
agreements  with the  Distributor  ("Authorized  Dealers")  for the provision of
certain shareholder support services to customers of such Authorized Dealers who
are shareholders of the Fund. The services  provided and the fees payable by the
Fund for these services are described in the Statement of Additional Information
under "Investment Advisory, Distribution and Servicing Arrangements."

DISTRIBUTOR

     Provident  Distributors,  Inc., with a principal  business  address at Four
Falls  Corporate  Center,   West  Conshohocken,   Pennsylvania  19428,  acts  as
Distributor  of the  Shares of each of the  Sansom  Street  Classes  of the Fund
pursuant to the  Distribution  Agreement  with the Fund on behalf of each of the
Sansom Street Classes.

EXPENSES

     The expenses of each  Portfolio  are deducted from the total income of such
Portfolio  before  dividends are paid. Any general expenses of the Fund that are
not readily  identifiable as belonging to a particular  investment  portfolio of
the Fund will be allocated among all investment  portfolios of the Fund based on
the relative net assets of the  investment  portfolios at the time such expenses
were accrued.  The Sansom Street Classes of the Fund pay their own  distribution
fees,  and may pay a  different  share than  other  classes of the Fund of other
expenses  (excluding advisory and custodial fees) if those expenses are actually
incurred in a different  amount by the Sansom Street  Classes or if they receive
different services.

     The investment  adviser may assume  expenses of the Portfolios from time to
time.  In certain  circumstances,  it may assume such  expenses on the condition
that it is reimbursed by the  Portfolios  for such amounts prior to the end of a
fiscal  year.  In such event,  the  reimbursement  of such amounts will have the
effect of  increasing  a  Portfolio's  expense  ratio and of  lowering  yield to
investors.

     For the fiscal year ended August 31, 1998,  the total expenses were .62% of
average net assets with  respect to the Sansom  Street Class of the Money Market
Portfolio  (not taking into account  waivers and  reimbursements  of .13%).  The
Sansom Street Classes of the Government  Obligations  Money Market Portfolio and
Municipal  Money Market  Portfolio did not incur any  expenses,  as no Shares of
such Classes had been sold to the public during the fiscal year ended August 31,
1998.

BANKING LAWS

     Banking laws and  regulations  currently  prohibit a bank  holding  company
registered  under the  Federal  Bank  Holding Act of 1956 or any bank or nonbank
affiliate thereof from sponsoring, organizing,  controlling, or distributing the
shares of a registered,  open-end investment company continuously engaged in the
issuance of its shares, and prohibit banks

                                       21

<PAGE>

generally from issuing,  underwriting,  selling or distributing securities,  but
such banking laws and  regulations  do not  prohibit  such a holding  company or
affiliate or banks generally from acting as investment  adviser,  transfer agent
or custodian to such an investment  company, or from purchasing shares of such a
company  as agent for and upon the  order of such a  customer.  PNC Bank,  BIMC,
PFPC, as well as the Banks, are subject to such banking laws and regulations. In
addition,   state   securities   laws  on  this  issue  may   differ   from  the
interpretations  of  federal  law  expressed  herein  and  banks  and  financial
institutions may be required to register as dealers pursuant to state law.

     Should future  legislative,  judicial or administrative  action prohibit or
restrict the  activities  of Banks in  connection  with the provision of support
services to their  customers,  the Fund might be required to alter materially or
cause the Fund to discontinue its  arrangements  with Banks generally and change
its method of  operations  with respect to the Sansom Street  Shares.  It is not
anticipated,  however,  that any change in the Fund's method of operations would
affect  its net asset  value per  share or  result  in a  financial  loss to any
customer.

DIVIDENDS AND DISTRIBUTIONS
- --------------------------------------------------------------------------------
     The Fund will distribute substantially all of the net investment income and
net  realized  capital  gains,  if  any,  of  each  of the  Portfolios  to  each
Portfolio's  shareholders.  All  distributions  are  reinvested  in the  form of
additional full and fractional Shares of the relevant Sansom Street Class unless
a shareholder elects otherwise.

     The net investment income (not including any net short-term  capital gains)
earned by each  Portfolio  will be  declared  as a dividend on a daily basis and
paid monthly.  Dividends are payable to shareholders of record immediately prior
to the  determination of net asset value made as of the close of regular trading
on the NYSE. Net short-term  capital gains, if any, will be distributed at least
annually.

TAXES
- --------------------------------------------------------------------------------
     Distributions   from  the  Money  Market   Portfolio  and  the   Government
Obligations Money Market Portfolio will generally be taxable to shareholders. It
is expected that all, or substantially all, of these  distributions will consist
of  ordinary  income.  You will be subject to income tax on these  distributions
regardless whether they are paid in cash or reinvested in additional shares. The
one major exception to these tax principles is that distributions on shares held
in an IRA (or other tax-qualified plan) will not be currently taxable.

     Distributions  from the Municipal  Money Market  Portfolio  will  generally
constitute  tax-exempt  income for shareholders for federal income tax purposes.
It is possible,  depending upon the Portfolio's  investments,  that a portion of
the  Portfolio's  distributions  could be taxable to  shareholders  as  ordinary
income or capital gains, but it is not expected that this will be the case.

     Although distributions from the Municipal Money Market Portfolio are exempt
for federal income tax purposes,  they will generally  constitute taxable income
for state and local income tax purposes except that, subject to limitations that
vary  depending on the state,  distributions  from  interest  paid by a state or
municipal entity may be exempt from tax in that state.

     Interest on  indebtedness  incurred by a  shareholder  to purchase or carry
shares of the Municipal Money Market Portfolio  generally will not be deductible
for federal income tax purposes.

     You should note that a portion of the exempt-interest dividends paid by the
Municipal  Money Market  Portfolio may  constitute an item of tax preference for
purposes   of   determining   federal   alternative   minimum   tax   liability.
Exempt-interest  dividends  will also be  considered  along with other  adjusted
gross income in determining  whether any Social Security or railroad  retirement
payments received by you are subject to federal income taxes.

                                       22

<PAGE>

     The  foregoing  is only a summary of certain tax  considerations  under the
current law,  which may be subject to change in the future.  You should  consult
your tax adviser for further information regarding federal,  state, local and/or
foreign tax consequences relevant to your specific situation.

DESCRIPTION OF SHARES
- --------------------------------------------------------------------------------
     The Fund has  authorized  capital of thirty billion shares of Common Stock,
$.001 par  value  per  share,  of which  18.326  billion  shares  are  currently
classified  into 97  different  classes  of Common  Stock (see  "Description  of
Shares" in the Statement of Additional Information).

     The Fund  offers  multiple  classes of shares in each of its Money  Market,
Municipal  Money Market and Government  Obligations  Money Market  Portfolios to
expand its  marketing  alternatives  and to  broaden  its range of  services  to
different investors. The expenses of the various classes within these Portfolios
vary based upon the services provided, which may affect performance.  Each class
of Common Stock of the Fund has a separate Rule 12b-1  distribution  plan. Under
the Distribution  Agreement and pursuant to each of the distribution  plans, the
Distributor  is  entitled  to  receive  from  each  class  as  compensation  for
distribution services provided to that class a distribution fee based on average
daily  net  assets.  A  salesperson  or any other  person  entitled  to  receive
compensation for servicing Fund shares may receive  different  compensation with
respect to different classes in a Portfolio of the Fund. An investor may contact
the Fund's  Distributor by calling  1-800-888-9723  to request more  information
concerning other classes available.

     THIS  PROSPECTUS AND THE STATEMENT OF ADDITIONAL  INFORMATION  INCORPORATED
HEREIN  RELATE  PRIMARILY  TO THE SANSOM  STREET  CLASSES  OF THE MONEY  MARKET,
MUNICIPAL MONEY MARKET AND GOVERNMENT  OBLIGATIONS  MONEY MARKET  PORTFOLIOS AND
DESCRIBE ONLY THE INVESTMENT OBJECTIVES AND POLICIES, OPERATIONS,  CONTRACTS AND
OTHER MATTERS RELATING TO THE SANSOM STREET CLASSES OF THESE PORTFOLIOS.

     Each  share  that  represents  an  interest  in a  Portfolio  has an  equal
proportionate interest in the assets belonging to such Portfolio with each other
share that  represents an interest in such  Portfolio,  even where a share has a
different class designation than another share  representing an interest in that
Portfolio.  Shares of the Fund do not have preemptive or conversion rights. When
issued for payment as described in this  Prospectus,  Shares of the Fund will be
fully paid and non-assessable.

     The Fund currently does not intend to hold annual  meetings of shareholders
except  as  required  by the 1940 Act or other  applicable  law.  The law  under
certain circumstances provides shareholders with the right to call for a meeting
of shareholders to consider the removal of one or more directors.  To the extent
required  by law,  the Fund will  assist in  shareholder  communication  in such
matters.

     Holders of shares of each of the Portfolios  will vote in the aggregate and
not by class on all matters,  except where otherwise  required by law.  Further,
shareholders of all investment portfolios of the Fund will vote in the aggregate
and not by portfolio  except as  otherwise  required by law or when the Board of
Directors determines that the matter to be voted upon affects only the interests
of the shareholders of a particular investment portfolio.  (See the Statement of
Additional Information under "Additional Information Concerning Fund Shares" for
examples when the 1940 Act requires voting by investment portfolio or by class.)
Shareholders  of the Fund are  entitled  to one vote for each  full  share  held
(irrespective of class or portfolio) and fractional votes for fractional  shares
held.  Voting rights are not cumulative  and,  accordingly,  the holders of more
than 50% of the  aggregate  shares of Common  Stock of the Fund may elect all of
the directors.

     As of November 16, 1998, to the Fund's knowledge,  no person held of record
or beneficially  25% or more of the outstanding  shares of all of the classes of
the Fund.

                                       23

<PAGE>

     The Fund will issue share  certificates  for Sansom Street Shares only upon
the written request of a shareholder sent to PFPC.

OTHER INFORMATION
- --------------------------------------------------------------------------------

REPORTS AND INQUIRIES

     Shareholders  will receive  unaudited  semi-annual  reports  describing the
Fund's  investment   operations  and  annual  financial  statements  audited  by
independent accountants.  Shareholder inquiries should be addressed to PFPC, the
Fund's transfer agent,  Bellevue Park Corporate  Center,  400 Bellevue  Parkway,
Wilmington, Delaware 19809, toll free (800) 430-9618.

                                       24

<PAGE>

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<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK.]

<PAGE>



NO  PERSON  HAS  BEEN  AUTHORIZED  TO  GIVE  ANY  INFORMATION  OR  TO  MAKE  ANY
REPRESENTATIONS  NOT CONTAINED IN THIS PROSPECTUS OR IN THE FUND'S  STATEMENT OF
ADDITIONAL INFORMATION  INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE
OFFERING MADE BY THIS  PROSPECTUS  AND, IF GIVEN OR MADE,  SUCH  INFORMATION  OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE FUND OR
ITS DISTRIBUTOR.  THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY THE FUND OR
BY THE  DISTRIBUTOR IN ANY  JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY
BE MADE.

                                -----------------
                                TABLE OF CONTENTS

                                                                           PAGE
Introduction ............................................................     2
Financial Highlights ....................................................     4
Investment Objectives and Policies ......................................     8
Year 2000 ...............................................................    13
Investment Limitations ..................................................    13
Purchase and Redemption of Shares .......................................    15
Net Asset Value .........................................................    18
Distribution of Shares ..................................................    18
Shareholder Servicing ...................................................    19
Management ..............................................................    19
Dividends and Distributions .............................................    22
Taxes ...................................................................    22
Description of Shares ...................................................    23
Other Information .......................................................    24


INVESTMENT ADVISER
BlackRock Institutional Management Corporation
Wilmington, Delaware

DISTRIBUTOR
Provident Distributors, Inc.
West Conshohocken, Pennsylvania

CUSTODIAN
PFPC Trust Company
Wilmington, Delaware

ADMINISTRATOR AND TRANSFER AGENT
PFPC Inc.
Wilmington, Delaware

COUNSEL
Drinker Biddle & Reath LLP
Philadelphia, Pennsylvania

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers, LLP
Philadelphia, Pennsylvania

<PAGE>
                               THE PRINCIPAL CLASS
                                   Prospectus

                             Money Market Portfolio


                                December 29, 1998

<PAGE>

                               THE PRINCIPAL CLASS
                                       OF
                               THE RBB FUND, INC.

                             MONEY MARKET PORTFOLIO

     This Prospectus offers shares of the Principal class of common stock of The
RBB Fund,  Inc. (the "Fund").  The Principal class  represents  interests in the
Money  Market  Portfolio  (the  "Portfolio"),  which is a taxable  money  market
portfolio of the Fund.

     The investment  objective of the Portfolio is to provide as high a level of
current  interest  income  as  is  consistent  with  maintaining  liquidity  and
stability of  principal.  It seeks to achieve  such  objective by investing in a
diversified portfolio of U.S. dollar-denominated money market instruments.

     SHARES OF THE PORTFOLIO ARE NOT DEPOSITS OR  OBLIGATIONS  OF, OR GUARANTEED
OR ENDORSED BY PNC BANK,  NATIONAL  ASSOCIATION, PFPC TRUST COMPANY OR ANY OTHER
BANK AND THE SHARES ARE NOT FEDERALLY  INSURED BY THE FEDERAL DEPOSIT  INSURANCE
CORPORATION,  THE FEDERAL  RESERVE  BOARD,  OR ANY OTHER  AGENCY.  INVESTMENT IN
SHARES OF THE PORTFOLIO INVOLVES  INVESTMENT RISKS,  INCLUDING THE POSSIBLE LOSS
OF  PRINCIPAL.  THERE CAN BE NO  ASSURANCE  THAT THE  PORTFOLIO  WILL BE ABLE TO
MAINTAIN A STABLE NET ASSET VALUE OF $1.00 PER SHARE.

     BlackRock   Institutional   Management   Corporation   ("BIMC")  serves  as
investment adviser for the Portfolio, PFPC Trust Company serves as custodian for
the Portfolio and PFPC Inc.  ("PFPC") serves as  administrator  and the transfer
and dividend disbursing agent for the Portfolio.  Provident  Distributors,  Inc.
(the "Distributor") acts as distributor for the Portfolio.

     This Prospectus  contains concise  information that a prospective  investor
needs to know before investing. Please keep it for future reference. A Statement
of  Additional  Information,  dated  December  29,  1998 has been filed with the
Securities  and Exchange  Commission  and is  incorporated  by reference to this
Prospectus.  It may be  obtained  upon  request  free of charge  from the Fund's
distributor by calling (800) 888-9723.
- --------------------------------------------------------------------------------
THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THIS
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------

PROSPECTUS                                                     December 29, 1998

<PAGE>

INTRODUCTION
- --------------------------------------------------------------------------------
     The  RBB  Fund,  Inc.  is  an  open-end   management   investment   company
incorporated  under the laws of the State of Maryland on February 29, 1988.  The
Fund  is  currently   operating  or  proposing  to  operate  seventeen  separate
investment  portfolios.  The shares (the "Principal Shares" or "Shares") offered
by this  Prospectus  represent  interests in the Principal class (the "Principal
Class") of the Money Market Portfolio.

     The MONEY MARKET PORTFOLIO'S  investment  objective is to provide as high a
level of current interest income as is consistent with maintaining liquidity and
stability of  principal.  It seeks to achieve  such  objective by investing in a
diversified portfolio of U.S.  dollar-denominated money market instruments which
meet certain ratings  criteria and present minimal credit risks. In pursuing its
investment objective, the Portfolio invests in a broad range of government, bank
and commercial obligations that may be available in the money markets.

     The  Portfolio  seeks to  maintain  a net asset  value of $1.00 per  share;
however, there can be no assurance that the Portfolio will be able to maintain a
stable net asset value of $1.00 per share.

An investor may purchase and redeem  Principal  Shares  through his broker or by
direct purchases or redemptions. See "Purchase and Redemption of Shares."

     An investment in the Principal  Shares is subject to certain risks,  as set
forth in detail under  "Investment  Objective and  Policies."  The Portfolio may
engage in the following investment  practices:  the use of repurchase agreements
and reverse repurchase agreements, the purchase of mortgage-related  securities,
the purchase of securities on a "when-issued" or "forward commitment" basis, the
purchase of stand-by  commitments  and the lending of  securities.  All of these
transactions  involve  certain  special  risks,  as set forth under  "Investment
Objective and  Policies." 

FEE TABLE 
ANNUAL FUND OPERATING EXPENSES (PRINCIPAL CLASS)
     AS A PERCENTAGE OF AVERAGE DAILY NET ASSETS

     The Fee Table below contains a summary of the annual operating  expenses of
the Principal Class of the Portfolio  based on expenses  expected to be incurred
for the fiscal year ended August 31, 1999,  as a percentage of average daily net
assets. An example based on the summary is also shown.
                                                                    MONEY MARKET
                                                                      PORTFOLIO
                                                                    ------------
Management fees (after waivers)(1) ..................................    .23%
12b-1 Fees ..........................................................    .40%
Other Expenses ......................................................    .17%
                                                                         ---
Total Fund Operating Expenses (Principal Class) (after waivers)(1) ..    .80%
                                                                         ===

(1) Management Fees and 12b-1 Fees are based on average daily net assets and are
    calculated  daily and paid monthly.  Before waivers for the Principal Class,
    Management  Fees would be .37%, and Total Fund  Operating  Expenses would be
    .98%.

EXAMPLE

     An  investor  would  pay the  following  expenses  on a $1,000  investment,
assuming  (1) a 5%  annual  return  and (2)  redemption  at the end of each time
period:

                                            1 YEAR  3 YEARS  5 YEARS  10 YEARS
                                            ------  -------  -------  --------
Money Market Portfolio-Principal Class* ...   $8      $26      $44       $99
* Other classes of the Portfolio are sold with different fees and expenses.

                                       2

<PAGE>

     The Example in the Fee Table assumes that all  dividends and  distributions
are reinvested and that the amounts listed under "Annual Fund Operating Expenses
(Principal Class)" remain the same in the years shown. THE EXAMPLE SHOULD NOT BE
CONSIDERED A  REPRESENTATION  OF PAST OR FUTURE EXPENSES AND ACTUAL EXPENSES MAY
BE GREATER OR LESS THAN THOSE SHOWN.  Long-term  shareholders  may pay more than
the economic  equivalent of the maximum front-end sales charges permitted by the
National Association of Securities Dealers, Inc.

     The Fee Table is  designed  to  assist an  investor  in  understanding  the
various  costs and  expenses  that an  investor  in the  Principal  Class of the
Portfolio will bear directly or indirectly.  (For more complete  descriptions of
the various  costs and expenses,  see  "Management  --  Investment  Adviser" and
"Distribution  of Shares"  below.) Expense figures are based on actual costs and
fees  charged  to the  class.  The Fee  Table  reflects  a  voluntary  waiver of
Management Fees for the Portfolio.  However,  there can be no assurance that any
future  waivers of Management  Fees will not vary from the figures  reflected in
the Fee Table.  To the  extent  that any  service  providers  assume  additional
expenses of the Portfolio,  such assumption will have the effect of lowering the
Portfolio's overall expense ratio and increasing its yield to investors.

     From time to time the  Portfolio  advertises  its  "yield"  and  "effective
yield." BOTH YIELD FIGURES ARE BASED ON HISTORICAL EARNINGS AND ARE NOT INTENDED
TO  INDICATE  FUTURE  PERFORMANCE.  The "yield" of the  Portfolio  refers to the
income  generated by an  investment  in the  Portfolio  over a seven-day  period
(which  period  will  be  stated  in the  advertisement).  This  income  is then
"annualized."  That is, the amount of income generated by the investment  during
that week is  assumed  to be  generated  each week over a 52-week  period and is
shown as a percentage of the  investment.  The  "effective  yield" is calculated
similarly  but,  when  annualized,  the income  earned by an  investment  in the
Portfolio is assumed to be reinvested.  The  "effective  yield" will be slightly
higher  than the  "yield"  because  of the  compounding  effect of this  assumed
reinvestment.

     The yield of any  investment  is generally a function of portfolio  quality
and maturity,  type of investment and operating expenses. The yield on Principal
Shares will fluctuate and is not necessarily  representative  of future results.
Any fees charged by  broker/dealers  directly to their  customers in  connection
with  investments  in  Principal  Shares  are not  reflected  in the  yields  of
Principal  Shares,  and such fees,  if charged,  will  reduce the actual  return
received by shareholders on their investments. The yield on Principal Shares may
differ from yields on shares of other classes that also  represent  interests in
the  Portfolio  depending on the  allocation of expenses to each of the classes.
See "Expenses."

INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
     The  Portfolio's  investment  objective  is to  provide  as high a level of
current  interest  income  as  is  consistent  with  maintaining  liquidity  and
stability  of  principal.  Obligations  held  by the  Portfolio  have  remaining
maturities  of 397 calendar days or less  (exclusive  of  securities  subject to
repurchase  agreements).  The  Portfolio  is a  diversified  portfolio  of  U.S.
dollar-denominated   instruments,   such  as  government,  bank  and  commercial
obligations,  that  may  be  available  in  the  money  markets  ("Money  Market
Instruments")  and that meet certain ratings criteria and present minimal credit
risks to the Portfolio.  See "Eligible  Securities."  There is no assurance that
the  investment  objective  of the  Portfolio  will be achieved.  The  following
descriptions  illustrate  the  types of Money  Market  Instruments  in which the
Portfolio invests.

     BANK OBLIGATIONS.  The Portfolio may purchase obligations of issuers in the
banking  industry,  such as short-term  obligations  of bank holding  companies,
certificates of deposit, bankers' acceptances and time deposits,  including U.S.
dollar-denominated  instruments  issued or  supported  by the credit of U.S.  or
foreign  banks  or  savings  institutions  having  total  assets  at the time of
purchase in excess of $1 billion.  The  Portfolio  may invest  substantially  in
obligations  of  foreign  banks or  foreign  branches  of U.S.  banks  where the
investment  adviser deems the instrument to present  minimal credit risks.  Such
investments  may  nevertheless  entail  risks in  addition  to those of domestic
issuers,   including  higher   transaction   costs,   less  complete   financial
information,  less stringent regulatory  requirements and less market liquidity.
The Portfolio may also make interest-bearing  savings deposits in commercial and
savings banks in amounts not in excess of 5% of its total assets.

                                       3

<PAGE>

     COMMERCIAL PAPER. The Portfolio may purchase commercial paper rated (at the
time  of  purchase)  in  the  two  highest  rating  categories  of a  nationally
recognized statistical rating organization ("Rating Organization"). These rating
categories  are  described  in the  Appendix  to  the  Statement  of  Additional
Information.  The Portfolio may also purchase unrated  commercial paper provided
that such paper is  determined to be of  comparable  quality by the  Portfolio's
investment adviser in accordance with guidelines approved by the Fund's Board of
Directors.

     Commercial paper purchased by the Portfolio may include  instruments issued
by foreign issuers,  such as Canadian  Commercial  Paper ("CCP"),  which is U.S.
dollar-denominated  commercial  paper  issued  by a  Canadian  corporation  or a
Canadian  counterpart  of a U.S.  corporation,  and in Europaper,  which is U.S.
dollar-denominated commercial paper of a foreign issuer, subject to the criteria
stated above for other commercial paper issuers.

     VARIABLE RATE DEMAND NOTES. The Portfolio may purchase variable rate demand
notes, which are unsecured  instruments that permit the indebtedness  thereunder
to vary and provide for periodic  adjustment in the interest rate.  Although the
notes are not normally traded and there may be no active secondary market in the
notes,  the Portfolio will be able (at any time or during the specified  periods
not exceeding 13 months,  depending upon the note involved) to demand payment of
the  principal of a note.  The notes are not  typically  rated by credit  rating
agencies,  but  issuers of  variable  rate  demand  notes must  satisfy the same
criteria as set forth above for issuers of commercial  paper.  If an issuer of a
variable  rate demand note  defaulted on its payment  obligation,  the Portfolio
might be unable to  dispose  of the note  because  of the  absence  of an active
secondary market.  For this or other reasons,  the Portfolio might suffer a loss
to the extent of the  default.  The  Portfolio  invests in variable  rate demand
notes only when the  Portfolio's  investment  adviser  deems the  investment  to
involve  minimal credit risk. The Portfolio's  investment  adviser also monitors
the continuing  creditworthiness  of issuers of such notes to determine  whether
the Portfolio should continue to hold such notes.

     REPURCHASE AGREEMENTS.  The Portfolio may agree to purchase securities from
financial  institutions  subject to the seller's agreement to repurchase them at
an agreed-upon  time and price  ("repurchase  agreements").  The securities held
subject to a  repurchase  agreement  may have  stated  maturities  exceeding  13
months, provided the repurchase agreement itself matures in less than 13 months.
Default by or bankruptcy of the seller would,  however,  expose the Portfolio to
possible loss because of adverse market action or delays in connection  with the
disposition of the underlying obligations.

     U.S. GOVERNMENT OBLIGATIONS.  The Portfolio may purchase obligations issued
or  guaranteed  by the U.S.  Government  or its agencies and  instrumentalities.
Obligations of certain agencies and instrumentalities of the U.S. Government are
backed by the full faith and credit of the United  States.  Others are backed by
the right of the issuer to borrow  from the U.S.  Treasury or are backed only by
the credit of the agency or instrumentality issuing the obligation.

     ASSET-BACKED   SECURITIES.   The  Portfolio  may  invest  in   asset-backed
securities which are backed by mortgages,  installment  sales contracts,  credit
card  receivables  or  other  assets  and  collateralized  mortgage  obligations
("CMOs") issued or guaranteed by U.S. Government agencies and, instrumentalities
or issued by private companies.  Asset-backed securities also include adjustable
rate securities.  The estimated life of an asset-backed security varies with the
prepayment experience with respect to the underlying debt instruments.  For this
and other reasons, an asset-backed  security's stated maturity may be shortened,
and the  security's  total return may be difficult  to predict  precisely.  Such
difficulties  are not expected,  however,  to have a  significant  effect on the
Portfolio since the remaining  maturity of any  asset-backed  security  acquired
will be 13 months or less.  Asset-backed  securities  are considered an industry
for industry concentration purposes. See "Investment Limitations." In periods of
falling  interest  rates,  the rate of mortgage  prepayments  tends to increase.
During  these  periods,  the  reinvestment  of  proceeds by the  Portfolio  will
generally be at lower rates than the rates on the prepaid obligations.

     REVERSE  REPURCHASE  AGREEMENTS.  The  Portfolio  may  enter  into  reverse
repurchase agreements with respect to portfolio securities. A reverse repurchase
agreement involves a sale by the Portfolio of securities that it holds concur-

                                       4

<PAGE>

rently with an agreement by the Portfolio to  repurchase  them at an agreed upon
time and price.  Reverse repurchase  agreements involve the risk that the market
value of the  securities  sold by the Portfolio may decline below the repurchase
price which the Portfolio is obligated to pay. Reverse repurchase agreements are
considered to be borrowings by the Portfolio under the Investment Company Act of
1940 (the "1940 Act").

     GUARANTEED  INVESTMENT  CONTRACTS.  The Portfolio may make  investments  in
obligations,  such  as  guaranteed  investment  contracts  and  similar  funding
agreements  (collectively,  "GICs"),  issued  by  highly  rated  U.S.  insurance
companies.  A GIC is a general  obligation of the issuing  insurance company and
not a separate account. The Portfolio's  investments in GICs are not expected to
exceed 5% of its total  assets at the time of  purchase  absent  unusual  market
conditions.   GIC  investments  are  subject  to  the  Fund's  policy  regarding
investment in illiquid securities.

     MUNICIPAL  OBLIGATIONS.   In  addition,  the  Portfolio  may,  when  deemed
appropriate by its  investment  adviser in light of the  Portfolio's  investment
objective,  invest  without  limitation  in high quality,  short-term  Municipal
Obligations  issued by state and local  governmental  issuers,  the  interest on
which may be taxable or tax-exempt  for federal  income tax  purposes,  provided
that such  obligations  carry  yields that are  competitive  with those of other
types of Money Market Instruments of comparable quality.

     STAND-BY COMMITMENTS. The Portfolio may acquire "stand-by commitments" with
respect  to  Municipal  Obligations  held in its  portfolio.  Under  a  stand-by
commitment, a dealer would agree to purchase at the Portfolio's option specified
Municipal  Obligations  at a  specified  price.  The  acquisition  of a stand-by
commitment may increase the cost, and thereby reduce the yield, of the Municipal
Obligation to which such commitment relates. The Portfolio will acquire stand-by
commitments  solely to  facilitate  portfolio  liquidity  and does not intend to
exercise its rights thereunder for trading purposes.

     WHEN-ISSUED SECURITIES.  The Portfolio may purchase portfolio securities on
a  "when-issued"  basis.  When-issued  securities are  securities  purchased for
delivery  beyond the normal  settlement  date at a stated  price and yield.  The
Portfolio will generally not pay for such  securities or start earning  interest
on them until they are received. Securities purchased on a when-issued basis are
recorded as an asset at the time the  commitment is entered into and are subject
to changes in value prior to delivery based upon changes in the general level of
interest rates. The Portfolio  expects that commitments to purchase  when-issued
securities  will not exceed 25% of the value of its total assets absent  unusual
market  conditions.  The  Portfolio  does not  intend  to  purchase  when-issued
securities  for  speculative  purposes but only in furtherance of its investment
objective.

     ELIGIBLE SECURITIES. The Portfolio will only purchase "eligible securities"
that present  minimal credit risks as determined by the  Portfolio's  investment
adviser  pursuant  to  guidelines  adopted by the Board of  Directors.  Eligible
securities  generally include:  (1) U.S. Government  securities,  (2) securities
that are rated at the time of purchase in the two highest  rating  categories by
one or more Rating Organizations (e.g., commercial paper rated "A-1" or "A-2" by
Standard & Poor's Ratings  Services  ("S&P")),  (3) securities that are rated at
the time of purchase by the only Rating  Organization rating the security in one
of its two highest  rating  categories for such  securities,  and (4) securities
that are not rated and are  issued  by an issuer  that does not have  comparable
obligations rated by a Rating Organization ("Unrated Securities"), provided that
such  securities  are  determined to be of comparable  quality to eligible rated
securities.  For  a  more  complete  description  of  eligible  securities,  see
"Investment Objective and Policies" in the Statement of Additional Information.

     ILLIQUID SECURITIES. The Portfolio will not invest more than 10% of its net
assets in illiquid  securities,  including  repurchase  agreements  which have a
maturity of longer than seven days,  time deposits with  maturities in excess of
seven days,  variable  rate demand notes with demand  periods in excess of seven
days unless the Portfolio's  investment  adviser  determines that such notes are
readily  marketable  and could be sold  promptly at the prices at which they are
valued, GICs, and other securities that are illiquid by virtue of the absence of
a readily  available  market or legal or  contractual  restrictions  on  resale.
Repurchase  agreements  subject to demand are deemed to have a maturity equal to
the

                                       5

<PAGE>

notice period.  Securities that have legal or contractual restrictions on resale
but have a readily available market are not deemed illiquid for purposes of this
limitation.  The  Portfolio's  investment  adviser will monitor the liquidity of
such restricted securities under the supervision of the Board of Directors.  See
"Investment  Objective and Policies -- Illiquid  Securities" in the Statement of
Additional Information.

YEAR 2000
- --------------------------------------------------------------------------------
     Like  other  mutual  funds,   financial  and  business   organizations  and
individuals  around  the  world,  the Fund could be  adversely  affected  if the
computer systems used by the Adviser and the Fund's other service providers,  or
persons with whom they deal, do not properly process and calculate  date-related
information  and data  from and after  January  1,  2000.  This  possibility  is
commonly known as the "Year 2000 Problem.  The Year 2000 Problem could also hurt
companies whose securities the Fund holds or securities markets  generally.  The
Fund has been advised by the Adviser, the  Administrators and the Custodian that
they are actively  taking steps to address the Year 2000 Problem with respect to
the computer  systems  that they use and to obtain  assurances  that  comparable
steps are being taken by the Fund's other major service  providers.  While there
can be no  assurance  that  the  Fund's  service  providers  will be  Year  2000
compliant,  the Fund's service providers expect that their plans to be compliant
will be achieved.

INVESTMENT LIMITATIONS
- --------------------------------------------------------------------------------
     The Portfolio's  investment  objective and the policies described above may
be changed by the Fund's Board of Directors without  shareholder  approval.  The
Portfolio may not, however,  change the following investment limitations without
such a vote of its shareholders.  (A more detailed  description of the following
investment  limitations,  together with other investment limitations that cannot
be changed  without a vote of  shareholders,  is contained  in the  Statement of
Additional Information under "Investment Objective and Policies.")

     The Portfolio may not:

         1. Borrow money,  except from banks for  temporary  purposes and except
     for reverse repurchase agreements, and then in amounts not in excess of 10%
     of the value of the Portfolio's  assets at the time of such borrowing,  and
     only if after such  borrowing  there is asset coverage of at least 300% for
     all borrowings of the Portfolio; or mortgage,  pledge or hypothecate any of
     its assets except in connection  with any such borrowing and in amounts not
     in excess of 10% of the value of the Portfolio's assets at the time of such
     borrowing;  or purchase portfolio securities while borrowings are in excess
     of 5% of the Portfolio's net assets.  (This borrowing  provision is not for
     investment leverage, but solely to facilitate management of the Portfolio's
     securities by enabling the Portfolio to meet redemption  requests where the
     liquidation  of portfolio  securities  is deemed to be  disadvantageous  or
     inconvenient.)

         2. Purchase securities of any one issuer,  other than securities issued
     or guaranteed by the U.S. Government or its agencies and instrumentalities,
     if  immediately  after and as a result of such purchase more than 5% of the
     value of its total  assets  would be  invested  in the  securities  of such
     issuer,  or more  than 10% of the  outstanding  voting  securities  of such
     issuer would be owned by the Portfolio,  except that up to 25% of the value
     of the Portfolio's  total assets may be invested  without regard to such 5%
     limitation.

         3. Purchase any securities other than Money Market Instruments, some of
     which may be subject to repurchase  agreements,  but the Portfolio may make
     interest-bearing  savings  deposits  in amounts  not in excess of 5% of the
     value of the Portfolio's assets and may make time deposits.

         4. Purchase any securities  which would cause, at the time of purchase,
     less  than 25% of the  value of the total  assets  of the  Portfolio  to be
     invested  in the  obligations  of issuers in the  banking  industry,  or in
     obligations,  such as repurchase  agreements,  secured by such  obligations
     (unless the Portfolio is in a temporary defensive position)

                                       6

<PAGE>

     or which would cause,  at the time of  purchase, more than 25% of the value
     of its total assets to be invested in the obligations  of  issuers  in  any
     other industry.

     So long as it values its portfolio securities on the basis of the amortized
cost method of valuation pursuant to Rule 2a-7 under the 1940 Act, the Portfolio
will meet the  following  limitations  on its  investments  in  addition  to the
fundamental  investment  limitations  described above.  These limitations may be
changed without a vote of shareholders of the Portfolio.

         1. The Portfolio  will limit its purchases of the securities of any one
     issuer,  other than  issuers of U.S.  Government  securities,  to 5% of its
     total  assets,  except  that the  Portfolio  may invest more than 5% of its
     total assets in First Tier  Securities  of one issuer for a period of up to
     three Business Days (as defined  below).  "First Tier  Securities"  include
     eligible securities that (i) if rated by more than one Rating Organization,
     are rated (at the time of purchase) by two or more Rating  Organizations in
     the highest rating category for such securities,  (ii) if rated by only one
     Rating  Organization,  are rated by such Rating Organization in its highest
     rating category for such  securities,  (iii) have no short-term  rating and
     are   comparable  in  priority  and  security  to  a  class  of  short-term
     obligations  of the  issuer of such  securities  that  have  been  rated in
     accordance with (i) or (ii) above, or (iv) are Unrated  Securities that are
     determined to be of  comparable  quality to such  securities.  Purchases of
     First Tier Securities that come within  categories (ii) and (iv) above will
     be approved or ratified by the Board of Directors.

         2. The Portfolio  will limit its  purchases of Second Tier  Securities,
     which are eligible  securities other than First Tier  Securities,  to 5% of
     its total assets.

         3. The  Portfolio  will limit its  purchases of Second Tier  Securities
     of one issuer to the greater of 1% of its total assets or $1 million.

PURCHASE AND REDEMPTION OF SHARES
- --------------------------------------------------------------------------------

                               PURCHASE PROCEDURES

     GENERAL.  Principal  Shares are sold  without a sales load on a  continuous
basis by the  Distributor.  The  Distributor is located at Four Falls  Corporate
Center,  Conshohocken,  Pennsylvania  19428.  Investors  may purchase  Principal
Shares  through an account  maintained by the investor  with his brokerage  firm
(the  "Account")  and may also  purchase  Shares  directly by mail or wire.  The
minimum initial investment is $25,000 and the minimum  subsequent  investment is
$2,500.  The Fund in its sole  discretion  may  accept or  reject  any order for
purchases of Principal Shares.

     All  payments  for initial  and  subsequent  investments  should be in U.S.
dollars.  The  brokerage  firm which  carries  the  Account  (the  "Broker")  is
responsible  for the prompt  transmission  of the order to the  Fund's  transfer
agent.  Purchases will be effected at the net asset value next determined  after
PFPC, the Fund's transfer agent, has received a purchase order in good order and
the Fund's  custodian  has Federal Funds  immediately  available to it. In those
cases  where  payment  is made by check,  Federal  Funds will  generally  become
available  two  Business  Days  after the check is  received  by the  Broker.  A
"Business Day" is any day that both the New York Stock Exchange (the "NYSE") and
the Federal Reserve Bank of  Philadelphia  (the "FRB") are open. On any Business
Day, orders which are accompanied by Federal Funds and received by PFPC by 12:00
noon  Eastern  Time,  and orders as to which  payment  has been  converted  into
Federal Funds by 12:00 noon Eastern Time, will be executed as of 12:00 noon that
Business Day. Orders which are accompanied by Federal Funds and received by PFPC
after 12:00 noon Eastern  Time but prior to the close of regular  trading on the
NYSE (generally 4:00 p.m. Eastern Time), and orders as to which payment has been
converted  into  Federal  Funds after 12:00 noon  Eastern  Time but prior to the
close of regular  trading on the NYSE on any Business  Day of the Fund,  will be
executed as of the close of regular  trading on the NYSE on that  Business  Day,
but will not be entitled to receive  dividends  declared on such  Business  Day.
Orders which are accompanied by Federal Funds and received

                                       7

<PAGE>

by PFPC as of the close of regular  trading on the NYSE or later,  and orders as
to which payment has been  converted to Federal Funds as of the close of regular
trading on the NYSE or later on a  Business  Day will be  processed  as of 12:00
noon Eastern Time on the following Business Day.

     PURCHASES  THROUGH AN ACCOUNT.  Purchases of Shares may be effected through
an  investor's  Account  with  his  Broker  through  procedures  established  in
connection with the requirements of Accounts at such Broker. The minimum initial
and  subsequent  investment  in Shares are  determined  by your Broker.  In such
event, beneficial ownership of Shares will be recorded by the Broker and will be
reflected in the Account statements provided by the Broker to such investors.  A
Broker may impose minimum investment Account requirements. Even if a Broker does
not impose a sales charge for purchases of Shares,  depending on the terms of an
investor's  Account with his Broker, the Broker may charge an investor's Account
fees for  automatic  investment  and other  services  provided  to the  Account.
Information  concerning  Account  requirements,  services and charges  should be
obtained  from an  investor's  Broker,  and this  Prospectus  should  be read in
conjunction  with any  information  received from a Broker.  Shareholders  whose
shares  are held in the  street  name  account  of a Broker  and who  desire  to
transfer such shares to the street name account of another Broker should contact
their current Broker.

     A Broker may offer investors  maintaining  Accounts the ability to purchase
Shares under an automatic purchase program (a "Purchase Program") established by
a participating  Broker. An investor who participates in a Purchase Program will
have his "free-credit"  cash balances in his Account  automatically  invested in
Principal  Shares.  The  frequency  of  investments  and the minimum  investment
requirement  will be  established  by the Broker and the Fund. In addition,  the
Broker may require a minimum amount of cash and/or securities to be deposited in
an Account for  participants  in its Purchase  Program.  The  description of the
particular  Broker's  Purchase  Program  should  be read  for  details,  and any
inquiries  concerning an Account under a Purchase  Program should be directed to
the Broker.

     If a Broker makes  special  arrangements  under which orders for  Principal
Shares are  received by PFPC prior to 12:00 noon  Eastern  Time,  and the Broker
guarantees that payment for such Shares will be made in available  Federal Funds
to the Fund's custodian prior to the close of regular trading on the NYSE on the
same day, such purchase orders will be effective and Shares will be purchased at
the  offering  price in effect  as of 12:00  noon  Eastern  Time on the date the
purchase order is received by PFPC.

     DIRECT PURCHASES.  An investor may also make direct investments at any time
in Principal  Shares through any Broker that has entered into a dealer agreement
with the  Distributor  (a  "Dealer").  An  investor  also  may  make an  initial
investment  in  Principal  Shares by mail by fully  completing  and  signing  an
application  obtained from a Dealer (the  "Application"),  specifying  the Money
Market  Portfolio,  and  mailing  it,  together  with a  check  payable  to "THE
PRINCIPAL CLASS" to THE PRINCIPAL  CLASS,  c/o PFPC, P.O. Box 8950,  Wilmington,
Delaware  19899.  An  Application  will be  returned to the  investor  unless it
contains the name of the Dealer from whom it was obtained.  Subsequent purchases
may be made  through a Dealer or by  forwarding  payment to the Fund's  transfer
agent at the foregoing address.

     Provided  that the  investment  is at least  $5,000,  an investor  may also
purchase Principal Shares by having his bank or Dealer wire Federal Funds to the
Fund's Custodian, PNC Bank. An investor's bank or Dealer may impose a charge for
this service.  The Fund does not currently  charge for effecting  wire transfers
but reserves the right to do so in the future. In order to ensure prompt receipt
of an investor's Federal Funds wire, for an initial investment,  it is important
that an investor follows these steps:

         A. Telephone the Fund's transfer agent, PFPC,  toll-free (800) 533-7719
(in  Delaware  call collect  (302)  791-1196),  and provide your name,  address,
telephone  number,  Social Security or Tax  Identification  Number,  specify the
Principal Class, the amount being wired, and by which bank or Dealer.  PFPC will
then provide an investor with a Fund account  number.  (Investors  with existing
accounts should also notify PFPC prior to wiring funds.)

                                       8

<PAGE>

         B. Instruct your bank or Dealer to wire the specified amount,  together
with your assigned account number, to PFPC's account with PNC Bank:

            PNC Bank, N.A., Philadelphia, PA
            ABA-0310-0005-3
            FROM: (name of investor)
            ACCOUNT NUMBER: (investor's account number with the Portfolio)
            FOR PURCHASE OF: (Money Market Portfolio)
            AMOUNT: (amount to be invested)

         C. Fully complete and sign the  Application  and mail it to the address
shown thereon. PFPC will not process initial purchases until it receives a fully
completed and signed Application.

     For subsequent investments, an investor should follow steps A and B above.

     RETIREMENT  PLANS.  Principal  Shares may be purchased in conjunction  with
individual  retirement  accounts  ("IRAs")  and  rollover  IRAs where PFPC Trust
Company acts as custodian. For further information as to applications and annual
fees,  contact the Distributor or your Broker. To determine whether the benefits
of an IRA are available and/or appropriate,  a shareholder should consult with a
tax adviser.

                              REDEMPTION PROCEDURES

     Redemption  orders  are  effected  at the net asset  value  per share  next
determined  after  receipt of the order in proper  form by the  Fund's  transfer
agent, PFPC. Investors may redeem all or some of their Shares in accordance with
one of the procedures described below.

     REDEMPTION  OF SHARES IN AN ACCOUNT.  An  investor  who  beneficially  owns
Principal  Shares through an Account may redeem  Principal Shares in his Account
in accordance with  instructions  and  limitations  pertaining to his Account by
contacting  his  Broker.  It is the  responsibility  of the  Broker to  transmit
purchase and  redemption  orders to PFPC and to credit its  investors'  accounts
with the  redemption  proceeds on a timely basis.  If such notice is received by
PFPC by 12:00 noon  Eastern Time on any Business  Day,  the  redemption  will be
effective as of 12:00 noon Eastern Time on that day.  Payment of the  redemption
proceeds will be made after 12:00 noon Eastern Time on the day the redemption is
effected,  provided  that the  Fund's  custodian  is open for  business.  If the
custodian is not open,  payment will be made on the next bank  business  day. If
the redemption  request is received  between 12:00 noon and the close of regular
trading on the NYSE on a Business  Day, the  redemption  will be effective as of
the close of regular  trading on the NYSE on such  Business Day and payment will
be made on the next  bank  business  day  following  receipt  of the  redemption
request.  If all Shares are redeemed,  all accrued but unpaid dividends on those
Shares will be paid with the redemption proceeds.

     A Broker  may also  redeem  each day a  sufficient  number of Shares of the
Primary Class to cover debit balances  created by transactions in the Account or
instructions  for cash  disbursements.  Shares  will be redeemed on the same day
that a transaction occurs that results in such a debit balance or charge.

     Each  Broker   reserves   the  right  to  waive  or  modify   criteria  for
participation in an Account or to terminate  participation in an Account for any
reason.

                                       9

<PAGE>

     REDEMPTION  OF SHARES  OWNED  DIRECTLY.  A direct  investor  may redeem any
number of Shares by sending a written  request to THE PRINCIPAL  CLASS c/o PFPC,
P.O. Box 8950, Wilmington, Delaware 19899. Redemption requests must be signed by
each  shareholder  in the same manner as the Shares are  registered.  Redemption
requests  for joint  accounts  require the  signature  of each joint  owner.  On
redemption  requests of $5,000 or more,  each signature  must be  guaranteed.  A
signature  guarantee  may be  obtained  from a domestic  bank or trust  company,
broker, dealer, clearing agency or savings association who are participants in a
medallion program recognized by the Securities Transfer  Association.  The three
recognized  medallion programs are Securities Transfer Agents Medallion (STAMP),
Stock  Exchanges  Medallion  Program  (SEMP) and New York Stock  Exchange,  Inc.
Medallion  Signature  Program (MSP).  Signature  guarantees that are not part of
these programs will not be accepted.

     Direct investors may redeem Shares without charge by telephone if they have
completed  and  returned  an  account  application  containing  the  appropriate
telephone  election.  To add a  telephone  option to an  existing  account  that
previously did not provide for this option, a Telephone  Authorization Form must
be filed with PFPC.  This form is available  from PFPC.  Once this  election has
been made, the  shareholder  may simply contact PFPC by telephone to request the
redemption by calling (888)  261-4073.  Neither the Fund, the  Distributor,  the
Portfolio,  the  Administrator  nor any other  Fund agent will be liable for any
loss,  liability,  cost or expense for  following  the  procedures  below or for
following instructions communicated by telephone that they reasonably believe to
be genuine.

     The Fund's telephone transaction procedures include the following measures:
(1)  requiring  the  appropriate  telephone  transaction  privilege  forms;  (2)
requiring  the caller to provide  the names of the account  owners,  the account
social  security  number and name of the Portfolio,  all of which must match the
Fund's records;  (3) requiring the Fund's service  representative  to complete a
telephone  transaction  form,  listing  all of the above  caller  identification
information; (4) requiring that redemption proceeds be sent only by check to the
account owners of record at the address of record, or by wire only to the owners
of record at the bank account of record; (5) sending a written  confirmation for
each  telephone  transaction  to the  owners of record at the  address of record
within  five  (5)  business  days of the  call;  and (6)  maintaining  tapes  of
telephone  transactions for six months, if the Fund elects to record shareholder
telephone  transactions.  For accounts held of record by  broker-dealers  (other
than the Distributor),  financial  institutions,  securities dealers,  financial
planners  or  other  industry   professionals,   additional   documentation   or
information  regarding the scope of a caller's  authority is required.  Finally,
for telephone  transactions  in accounts held  jointly,  additional  information
regarding other account holders is required.  Telephone transactions will not be
permitted  in  connection  with  IRA or other  retirement  plan  accounts  or by
attorney-in-fact under power of attorney.

     Proceeds of a telephone  redemption  request  will be mailed by check to an
investor's  registered  address unless he has  designated in his  Application or
Telephone  Authorization Form that such proceeds are to be sent by wire transfer
to a specified  checking or savings account.  If proceeds are to be sent by wire
transfer,  a telephone redemption request received prior to the close of regular
trading  on the NYSE  will  result in  redemption  proceeds  being  wired to the
investor's  bank  account on the next day that a wire  transfer can be effected.
The minimum redemption for proceeds sent by wire transfer is $5,000. There is no
maximum for proceeds sent by wire transfer.  The Fund may modify this redemption
service at any time or charge a service fee upon prior  notice to  shareholders,
although no fee is currently contemplated.

     REDEMPTION  BY CHECK.  Upon  request,  the Fund  will  provide  any  direct
investor  and any investor who does not have check  writing  privileges  for his
Account with forms of drafts  ("checks")  payable through PNC Bank. These checks
may be made  payable to the order of anyone.  The  minimum  amount of a check is
$100:  however, a broker may establish a higher minimum.  An investor wishing to
use this check writing  redemption  procedure should complete specimen signature
cards (available from PFPC), and then forward such signature cards to PFPC. PFPC
will then  arrange for the checks to be honored by PNC Bank.  Investors  who own
Shares  through an Account  should  contact their  brokers for signature  cards.
Investors  of joint  accounts  may elect to have  checks  honored  with a single
signature. Check

                                       10

<PAGE>

redemptions  will be subject to PNC Bank's rules governing  checks.  An investor
will be able to stop  payment  on a check  redemption.  The Fund or PNC Bank may
terminate  this  redemption  service at any time,  and  neither  shall incur any
liability for honoring checks,  for effecting  redemptions to pay checks, or for
returning checks which have not been accepted.

     When a check is  presented  to PNC Bank for  clearance,  PNC  Bank,  as the
investor's  agent, will cause the Fund to redeem a sufficient number of full and
fractional  Shares owned by the investor to cover the amount of the check.  This
procedure  enables the investor to continue to receive dividends on those Shares
equaling  the amount  being  redeemed  by check  until such time as the check is
presented to PNC Bank.  Pursuant to rules under the 1940 Act,  checks may not be
presented for cash payment at the offices of PNC Bank.  This limitation does not
affect checks used for the payment of bills or to obtain cash at other banks.

     ADDITIONAL  REDEMPTION  INFORMATION.  The Fund ordinarily will make payment
for all Shares  redeemed within seven days after receipt by PFPC of a redemption
request in proper form.  Although the Fund will redeem Shares purchased by check
before the check clears, payment of the redemption proceeds may be delayed for a
period of up to fifteen days after their purchase,  pending a determination that
the check has cleared. This procedure does not apply to Shares purchased by wire
payment.  Investors should consider  purchasing Shares using a certified or bank
check if they anticipate an immediate need for redemption proceeds.

     The Fund imposes no charge when Shares are redeemed.  The Fund reserves the
right to redeem any  account in the  Principal  Class  involuntarily,  on thirty
days'  notice,  if such account falls below $1,500 and during such 30-day notice
period the amount  invested in such account is not increased to at least $1,500.
Payment  for  Shares  redeemed  may be  postponed  or the  right  of  redemption
suspended as provided by the rules of the Securities and Exchange Commission.

NET ASSET VALUE
- --------------------------------------------------------------------------------
     The net asset value per share of the  Principal  Class of the Portfolio for
the purpose of pricing  purchase and redemption  orders is determined twice each
day,  once as of 12:00  noon  Eastern  Time and once as of the close of  regular
trading on the NYSE on each  weekday  with the  exception  of those  holidays on
which  either  the NYSE or the FRB is closed.  Currently,  the NYSE is closed on
weekends and the  customary  national  business  holidays of New Year's Day, Dr.
Martin  Luther  King,  Jr. Day,  Presidents'  Day,  Good Friday,  Memorial  Day,
Independence  Day,  Labor Day,  Thanksgiving  Day and  Christmas  Day and on the
preceding  Friday or  subsequent  Monday when one of these  holidays  falls on a
Saturday  or  Sunday.  The FRB is  currently  closed  on  weekends  and the same
holidays on which the NYSE is closed as well as Veterans'  Day and Columbus Day.
The net  asset  value  per  share of the  Principal  Class of the  Portfolio  is
calculated  by adding the  proportionate  interest of each class in the value of
the securities,  cash and other assets of the Portfolio,  subtracting the actual
and accrued  liabilities  of the Principal  Class and dividing the result by the
number of outstanding  shares of the class. The net asset value per share of the
Portfolio is  determined  independently  of any of the Fund's  other  investment
portfolios.

     The Fund seeks to maintain for the Portfolio a net asset value of $1.00 per
share for  purposes  of  purchases  and  redemptions  and values  its  portfolio
securities on the basis of the amortized  cost method of valuation  described in
the Statement of Additional Information under the heading "Valuation of Shares."
There can be no assurance that net asset value per share will not vary.

     With the  approval  of the  Board of  Directors,  the  Portfolio  may use a
pricing service, bank or broker-dealer  experienced in such matters to value the
Portfolio's  securities.  A more  detailed  discussion  of net  asset  value and
security valuation is contained in the Statement of Additional Information.

                                       11

<PAGE>

MANAGEMENT
- --------------------------------------------------------------------------------

BOARD OF DIRECTORS

     The  business  and affairs of the Fund and each  investment  portfolio  are
managed under the direction of the Fund's Board of Directors. The Fund currently
operates or proposes to operate seventeen investment  portfolios.  The Principal
Class represents interests in the Money Market Portfolio.

INVESTMENT ADVISER

     BIMC,  an indirect  majority-owned  subsidiary  of PNC Bank,  serves as the
investment adviser for the Portfolio. BIMC has its principal offices at Bellevue
Park Corporate  Center,  400 Bellevue Parkway,  Wilmington,  Delaware 19809. PNC
Bank and its  subsidiaries  currently  manage over $45.9  billion of assets,  of
which  approximately  $31.4 billion are mutual funds.  PNC Bank, a national bank
whose  principal   business   address  is  1600  Market  Street,   Philadelphia,
Pennsylvania  19103,  is a  wholly-owned  subsidiary  of PNC  Bancorp,  Inc. PNC
Bancorp,Inc. is a bank holding company and a wholly-owned subsidiary of PNC Bank
Corp., a multi-bank holding company.

     As investment  adviser to the Portfolio,  BIMC manages the Portfolio and is
responsible  for all  purchases  and sales of  portfolio  securities.  BIMC also
provides research and credit analysis.  In entering into Portfolio  transactions
for the  Portfolio  with a broker,  BIMC may take into  account the sale by such
broker  of  shares  of the  Portfolio,  subject  to  the  requirements  of  best
execution.  The agreement  between BIMC and RBB with respect to the Money Market
Portfolio  provides  for  BIMC to  also  assist  generally  in  supervising  the
operations of the Portfolio,  and to maintain the Portfolio's financial accounts
and records. These administrative  responsibilities have been delegated to PFPC,
as further described below.

     For the services  provided to and expenses assumed by it for the benefit of
the Portfolio,  BIMC is entitled to receive the following  fees,  computed daily
and payable monthly based on the Portfolio's  average daily net assets:  .45% of
the first $250 million; .40% of the next $250 million; and .35% of net assets in
excess of $500 million.

     For the Fund's fiscal year ended August 31, 1998, the Fund paid  investment
advisory fees aggregating  .24% of the average net assets of the Portfolio,  and
BIMC  waived  advisory  fees  aggregating  .13% of the average net assets of the
Portfolio.

     PNC Bank  was  formerly  sub-adviser  to the  Money  Market  Portfolio  and
provided  research,  credit  analysis  and  recommendations  with respect to the
Portfolio's investments and supplied certain computer facilities,  personnel and
other services.  The facilities,  personnel,  services and related expenses have
been  transferred to BIMC and in return,  BIMC's  obligation to pay a portion of
the  sub-advisory  fee to PNC  Bank has been  terminated.  For its  sub-advisory
services,  PNC Bank was  entitled to receive from BIMC an amount equal to 75% of
the investment advisory fee paid by the Portfolio to BIMC (subject to adjustment
in certain circumstances). The sub-advisory fees paid by BIMC to PNC Bank had no
effect on the  investment  advisory fees payable by the  Portfolio to BIMC.  The
services  provided  by BIMC and the fees  payable  by the  Portfolio  for  these
services are described further in the Statement of Additional  Information under
"Management of the Company".

ADMINISTRATOR

     PFPC provides  administration and accounting services to the Portfolio as a
delegate  of BIMC  under  the  advisory  agreement.  The Fund has  agreed to pay
directly  to PFPC the fees for  administration  and  accounting  services to the
Money Market  Portfolio which PFPC would have received  directly from BIMC. Such
arrangement has no effect on the total advisory and administrative  fees payable
by the Portfolio to BIMC. Pursuant to the delegation PFPC is entitled to receive
an administration fee, computed daily, and payable monthly at the annual rate of
 .10% of the average daily net assets of the Portfolio. PFPC's principal business
address is 400 Bellevue Parkway, Wilmington, Delaware 19809.

                                       12

<PAGE>

TRANSFER AGENT, DIVIDEND DISBURSING AGENT, AND CUSTODIAN

     PFPC Trust Company,  an indirect wholly owned subsidiary of PNC Bank Corp.,
will succeed PNC Bank, National Association ("PNC Bank") as the Fund's custodian
pursuant to an assignment.  PNC Bank wil continue to provide certain services to
PFPCTrust  Company.  PFPC  serves as the  Fund's  transfer  agent  and  dividend
disbursing  agent.  The  principal  offices of PFPC are located at 400  Bellevue
Parkway,  Wilmington,  Delaware 19809. PFPC may enter into shareholder servicing
agreements  with  Dealers  for the  provision  of  certain  shareholder  support
services to customers of such Dealers who are  shareholders  of the  Portfolios.
The services  provided  and the fees payable by the Fund for these  services are
described in the Statement of Additional Information under "Investment Advisory,
Distribution and Servicing Arrangements."

DISTRIBUTOR

     Provident  Distributors,  Inc., with a principal  business  address at Four
Falls  Corporate  Center,   West  Conshohocken,   Pennsylvania  19428,  acts  as
Distributor of the Principal  Shares pursuant to a distribution  agreement dated
May 29, 1998 (the "Distribution Agreement").

EXPENSES

     The expenses of the  Portfolio  are  deducted  from the total income of the
Portfolio  before  dividends are paid. Any general expenses of the Fund that are
not readily  identifiable as belonging to a particular  investment  portfolio of
the Fund will be allocated  among all  investment  portfolios  of the Fund based
upon the relative net assets of the investment  portfolios.  The Principal Class
of the Fund pays its own  distribution  fees and may pay a different  share than
other classes of the Fund of other  expenses  (excluding  advisory and custodial
fees) if those  expenses  are  actually  incurred in a  different  amount by the
Principal Class or if it receives different services.

     The  investment  adviser may assume  expenses of the Portfolio from time to
time.  In certain  circumstances,  it may assume such  expenses on the condition
that it is reimbursed by the  Portfolios  for such amounts prior to the end of a
fiscal  year.  In such event,  the  reimbursement  of such amounts will have the
effect of increasing  the  Portfolio's  expense  ratio and of lowering  yield to
investors.

DISTRIBUTION OFSHARES
- --------------------------------------------------------------------------------
     The Board of  Directors of the Fund  approved and adopted the  Distribution
Agreement and Plan of Distribution for the Principal Class (the "Plan") pursuant
to Rule 12b-1 under the 1940 Act. Under the Plan, the Distributor is entitled to
receive from the Principal Class a distribution  fee, which is accrued daily and
paid  monthly,  of up to .50% on an  annualized  basis of the average  daily net
assets of the Principal Class. The actual amount of such  compensation is agreed
upon from time to time by the Fund's  Board of  Directors  and the  Distributor.
Under  the  Distribution  Agreement,   the  Distributor  has  agreed  to  accept
compensation  for its  services  thereunder  and under the Plan in the amount of
 .45% of the average  daily net assets of the  Principal  Class on an  annualized
basis in any year. The  Distributor  may, in its discretion,  voluntarily  waive
from time to time all or any portion of its distribution fee.

     Under the Distribution  Agreement and Plan, the Distributor may re-allocate
an  amount  up to the full  fee  that it  receives  to  financial  institutions,
including broker/dealers, based upon the aggregate investment amounts maintained
by and services provided to shareholders of the Principal Class serviced by such
financial  institutions.  The Distributor may also reimburse  broker/dealers for
other  expenses  incurred  in the  promotion  of the  sale of Fund  shares.  The
Distributor  and/or  broker/dealers  pay for the  cost  of  printing  (excluding
typesetting)  and  mailing  to  prospective  investors  prospectuses  and  other
materials  relating to the Fund as well as for related direct mail,  advertising
and promotional expenses.

                                       13

<PAGE>

     The Plan obligates the Fund,  during the period it is in effect,  to accrue
and pay to the  Distributor  on behalf of the Principal  Class the fee agreed to
under  the  Distribution  Agreement.  Payments  under  the Plan are not based on
expenses  actually  incurred by the  Distributor,  and the  payments  may exceed
distribution expenses actually incurred.

DIVIDENDS AND DISTRIBUTIONS
- --------------------------------------------------------------------------------
     The Fund will distribute substantially all of the net investment income and
net realized  capital gains,  if any, of the Principal Class of the Portfolio to
the shareholders of the Principal Class. All distributions are reinvested in the
form of additional  full and  fractional  Principal  Shares unless a shareholder
elects otherwise.

     The net investment income (not including any net short-term  capital gains)
earned by the Portfolio will be declared as a dividend on a daily basis and paid
monthly.  Dividends are payable to shareholders of record  immediately  prior to
the  determination  of net asset  value  made as of the close of  trading of the
NYSE.  Net  short-term  capital  gains,  if any,  will be  distributed  at least
annually.

TAXES
- --------------------------------------------------------------------------------
     Distributions  from the Money Market Portfolio will generally be taxable to
shareholders.   It  is  expected  that  all,  or  substantially  all,  of  these
distributions will consist of ordinary income. You will be subject to income tax
on these distributions regardless whether they are paid in cash or reinvested in
additional  shares.  The one major  exception  to these tax  principles  is that
distributions on shares held in an IRA (or other tax-qualified plan) will not be
currently taxable.

     The  foregoing  is only a summary of certain tax  considerations  under the
current law,  which may be subject to change in the future.  You should  consult
your tax adviser for further information regarding federal,  state, local and/or
foreign tax consequences relevant to your specific situation.

DESCRIPTION OF SHARES
- --------------------------------------------------------------------------------
     The Fund has  authorized  capital of thirty billion shares of Common Stock,
$.001 par  value  per  share,  of which  18.326  billion  shares  are  currently
classified  into 97  different  classes of Common  Stock ( see  "Description  of
Shares" in the Statement of Additional Information).

     The Fund offers multiple classes of shares in its Money Market Portfolio to
expand its  marketing  alternatives  and to  broaden  its range of  services  to
different  investors.  The expenses of the various  classes within the Portfolio
varies  based upon the services  provided,  which may affect  performance.  Each
class of Common Stock of the Fund that has a Rule 12b-1  distribution plan has a
separate plan for the class. Under the Distribution  Agreement entered into with
the Distributor and pursuant to each of the distribution  plans, the Distributor
is entitled to receive from each class as compensation for distribution services
provided to that class a distribution  fee based on average daily net assets.  A
salesperson or any other person entitled to receive  compensation  for servicing
Fund shares may receive different compensation with respect to different classes
in the  Portfolio.  An investor  may contact the Fund's  distributor  by calling
1-800-888-9723 to request more information concerning other classes available.

     THIS  PROSPECTUS AND THE STATEMENT OF ADDITIONAL  INFORMATION  INCORPORATED
HEREIN RELATES SOLELY TO THE PRINCIPAL  CLASS OF THE MONEY MARKET  PORTFOLIO AND
DESCRIBES ONLY THE INVESTMENT OBJECTIVE AND POLICIES, OPERATIONS,  CONTRACTS AND
OTHER MATTERS RELATING TO THE PRINCIPAL CLASS OF THE MONEY MARKET PORTFOLIO.

     Each  share that  represents  an  interest  in the  Portfolio  has an equal
proportionate interest in the assets belonging to such Portfolio with each other
share that  represents an interest in such  Portfolio,  even where a share has a
different

                                       14

<PAGE>

class designation than another share  representing an interest in the Portfolio.
Shares of the Fund do not have preemptive or conversion rights.  When issued for
payment as described in this  Prospectus,  Shares of the Fund will be fully paid
and non-assessable.

     The Fund currently does not intend to hold annual  meetings of shareholders
except  as  required  by the 1940 Act or other  applicable  law.  The law  under
certain circumstances provides shareholders with the right to call for a meeting
of shareholders to consider the removal of one or more directors.  To the extent
required  by law,  the Fund will  assist in  shareholder  communication  in such
matters.

     Holders of shares of the  Portfolio  will vote in the  aggregate and not by
class  on  all  matters,  except  where  otherwise  required  by  law.  Further,
shareholders of all investment portfolios of the Fund will vote in the aggregate
and not by portfolio  except as  otherwise  required by law or when the Board of
Directors determines that the matter to be voted upon affects only the interests
of the shareholders of a particular investment portfolio.  (See the Statement of
Additional Information under "Additional Information Concerning Fund Shares" for
examples of when the 1940 Act  requires  voting by  investment  portfolio  or by
class.)  Shareholders  of the Fund are  entitled to one vote for each full share
held  (irrespective  of class or portfolio) and fractional  votes for fractional
shares held. Voting rights are not cumulative and,  accordingly,  the holders of
more than 50% of the aggregate  shares of Common Stock of the Fund may elect all
of the directors.

     As of November 16, 1998, to the Fund's knowledge,  no person held of record
or beneficially  25% or more of the outstanding  shares of all of the classes of
the Fund.

OTHER INFORMATION
- --------------------------------------------------------------------------------

REPORTS AND INQUIRIES

     Shareholders  will receive  unaudited  semi-annual  reports  describing the
Fund's  investment   operations  and  annual  financial  statements  audited  by
independent accountants.  Shareholder inquiries should be addressed to PFPC, the
Fund's transfer agent,  Bellevue Park Corporate  Center,  400 Bellevue  Parkway,
Wilmington,  Delaware 19809,  toll-free (800) 533-7719 (in Delaware call collect
(302) 791-1196).

                                       15

<PAGE>

NO  PERSON  HAS  BEEN  AUTHORIZED  TO  GIVE  ANY  INFORMATION  OR  TO  MAKE  ANY
REPRESENTATIONS  NOT CONTAINED IN THIS PROSPECTUS OR IN THE FUND'S  STATEMENT OF
ADDITIONAL INFORMATION  INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE
OFFERING MADE BY THIS  PROSPECTUS  AND, IF GIVEN OR MADE,  SUCH  INFORMATION  OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE FUND OR
ITS DISTRIBUTOR.  THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY THE FUND OR
BY THE  DISTRIBUTOR IN ANY  JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY
BE MADE.



                               ------------------
                                    CONTENTS
                                                                          PAGE
Introduction ..........................................................     2
Investment Objective and Policies .....................................     3
Year 2000 .............................................................     6
Investment Limitations ................................................     6
Purchase and Redemption of Shares .....................................     7
Net Asset Value .......................................................    11
Management ............................................................    12
Distribution of Shares ................................................    13
Dividends and Distributions ...........................................    14
Taxes .................................................................    14
Description of Shares .................................................    14
Other Information .....................................................    15

INVESTMENT ADVISER
BlackRock Institutional Management Corporation
Wilmington, Delaware

DISTRIBUTOR
Provident Distributors, Inc.
West Conshohocken, Pennsylvania

CUSTODIAN
PFPC Trust Company
Wilmington, Delaware

ADMINISTRATOR AND TRANSFER AGENT
PFPC Inc.
Wilmington, Delaware

COUNSEL
Drinker Biddle & Reath LLP
Philadelphia, Pennsylvania

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers LLP
Philadelphia, Pennsylvania

<PAGE>
PROSPECTUS
DECEMBER 29, 1998

                                 BOSTON PARTNERS
                                    LARGE CAP
                                   VALUE FUND
                             (INSTITUTIONAL SHARES)

bp
BOSTON PARTNERS ASSET MANAGEMENT, L.P.
[LOGO GRAPHIC OMITTED]

<PAGE>

                      BOSTON PARTNERS LARGE CAP VALUE FUND
                              (INSTITUTIONAL CLASS)
                                       OF
                               THE RBB FUND, INC.

     Boston  Partners  Large  Cap  Value  Fund  (the  "Fund")  is an  investment
portfolio  of The RBB Fund,  Inc.  ("RBB"),  an open-end  management  investment
company.  The  shares of the  Institutional  Class  ("Shares")  offered  by this
Prospectus  represent interests in the Fund. The Fund is a diversified fund that
seeks long-term growth of capital, with current income as a secondary objective,
primarily  through  equity  investments,  such as common  stocks and  securities
convertible into common stocks.  It seeks to achieve its objectives by investing
at least 65% of its total assets in a diversified portfolio consisting of equity
securities  of issuers with a market  capitalization  of primarily $1 billion or
greater and identified by Boston Partners Asset Management, L.P. (the "Adviser")
as equity securities that it believes possess value characteristics. The Adviser
examines  various  factors  in  determining  the value  characteristics  of such
issuers,  including, but not limited to, price to book value ratios and price to
earnings ratios. These value  characteristics are examined in the context of the
issuer's operating and financial fundamentals such as return on equity, earnings
growth and cash flow.

     This Prospectus contains  information that a prospective  investor needs to
know before  investing.  Please  keep it for future  reference.  A Statement  of
Additional  Information,  dated  December  29,  1998,  has been  filed  with the
Securities  and Exchange  Commission  and is  incorporated  by reference in this
Prospectus.  It may be obtained  free of charge  from the Fund by calling  (888)
261-4073.  The  Prospectus  and the  Statement  of  Additional  Information  are
available for reference, along with other related materials, on the SEC Internet
Web Site (http://www.sec.gov).

SHARES OF THE FUND ARE NOT DEPOSITS OR  OBLIGATIONS OF OR GUARANTEED OR ENDORSED
BY PNC BANK,  NATIONAL  ASSOCIATION, PFPC  TRUST COMPANY  OR ANY OTHER  BANK AND
SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT  INSURANCE  CORPORATION,
THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY. INVESTMENTS IN SHARES OF THE FUND
INVOLVE INVESTMENT RISKS, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.

- --------------------------------------------------------------------------------
THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THIS
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------

PROSPECTUS                                                     December 29, 1998

<PAGE>

INTRODUCTION
- --------------------------------------------------------------------------------
     RBB is an open-end  management  company  incorporated under the laws of the
State of Maryland currently operating or proposing to operate seventeen separate
investment portfolios. The Shares offered by this Prospectus represent interests
in the Boston Partners Large Cap Value Fund. RBB was incorporated in Maryland on
February 29, 1988.

FEE TABLE
     The following  table  illustrates  annual  operating  expenses  incurred by
Institutional Shares of the Fund (after fee waivers and expense  reimbursements)
for the fiscal  period ended August 31, 1998,  as a percentage  of average daily
net assets. An example based on the summary is also shown.

ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)
     Management Fees (after waivers)* .................................    .49%
     12b-1 Fees .......................................................   0.00%
     Other Expenses (after waivers and reimbursements). ...............    .51%
                                                                          ----
   Total Fund Operating Expenses (after waivers and expense 
      reimbursements)* ................................................   1.00%
                                                                          ====

* In the  absence of fee waivers and  expense  reimbursements,  Management  Fees
  would be  0.75%;  Other  Expenses  would be .74%;  and  Total  Fund  Operating
  Expenses would be 1.49%. Management Fees are based on average daily net assets
  and are calculated daily and paid monthly.

EXAMPLE
     An investor would pay the following  expenses on a $1,000 investment in the
Fund, assuming (1) a 5% annual return and (2) redemption at the end of each time
period:

                                                 ONE     THREE    FIVE      TEN
                                                 YEAR    YEARS    YEARS    YEARS
                                                 ----    -----    -----    -----
     Boston Partners Large Cap Value Fund .....  $10     $32       $55     $122

     The Fee Table is  designed  to  assist an  investor  in  understanding  the
various  costs and expenses  that an investor in the Fund will bear  directly or
indirectly.  (For more complete  descriptions of the various costs and expenses,
see  "Management"  and  "Distribution  of Shares" below.) The Fee Table reflects
expense   reimbursements   and  voluntary   waivers  of   Management   Fees  and
Administrative  Services Fees for the Fund.  However,  there can be no assurance
that any  future  expense  reimbursements  and  waivers of  Management  Fees and
Administrative Services Fees will not vary from the figures reflected in the Fee
Table.

     The Example in the Fee Table assumes that all  dividends and  distributions
are  reinvested  and  that the  amounts  listed  under  "Annual  Fund  Operating
Expenses"  remain  the  same in the  years  shown.  THE  EXAMPLE  SHOULD  NOT BE
CONSIDERED A  REPRESENTATION  OF PAST OR FUTURE EXPENSES AND ACTUAL EXPENSES MAY
BE GREATER OR LESS THAN THOSE SHOWN.

FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
     The "Financial  Highlights"  presented  below set forth certain  investment
results for shares of the Institutional Class of the Fund for the period January
2, 1997 (date of  inception)  through  August 31,  1997 and for the fiscal  year
ended August 31, 1998.  The financial data included in this table should be read
in  conjunction  with  the  financial  statements  and  notes  thereto  and  the
unqualified  report of  PricewaterhouseCoopers  LLP  ("PricewaterhouseCoopers"),
RBB's  independent  accountant,  which are  incorporated  by reference  into the
Statement of Additional  Information.  Further information about the performance
of the  Institutional  Class of the Fund is  available  in the Annual  Report to
Shareholders. Both the Statement of Additional Information and the Annual Report
to  Shareholders  may be  obtained  from the Fund free of charge by calling  the
telephone number on page 1 of the prospectus.

                                       2
<PAGE>

                      BOSTON PARTNERS LARGE CAP VALUE FUND
         (FOR AN INSTITUTIONAL SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

<TABLE>
<CAPTION>
                                                                                                    FOR THE PERIOD
                                                                            FOR THE FISCAL         JANUARY 2, 1997*
                                                                              YEAR ENDED          THROUGH AUGUST 31,
                                                                            AUGUST 31, 1998              1997
                                                                            ---------------       ------------------
<S>                                                                               <C>                    <C>    
Per Share Operating Performance**
Net asset value, beginning of period .....................................        $12.46                 $ 10.00
                                                                                 -------                 -------
Net investment income (1) ................................................          0.12                    0.05
Net realized and unrealized gain/(loss) on investments (2) ...............         (1.31)                   2.41
                                                                                 -------                 -------
Net increase/(decrease) in net assets resulting from operations ..........         (1.19)                   2.46
                                                                                 -------                 -------
DIVIDENDS TO SHAREHOLDERS FROM:
Net investment income ....................................................         (0.08)                     --
Net realized capital gains ...............................................         (0.61)                     --
                                                                                 -------                 -------
Net asset value, end of period ...........................................       $ 10.58                 $ 12.46
                                                                                 =======                 =======
Total investment return (3) ..............................................        (10.23)%                 24.60%
                                                                                 =======                 =======
Ratios/Supplemental Data .................................................       $50,724                 $24,603
Net assets, end of period (000)
Ratio of expenses to average net assets(1)(4) ............................          1.00%                   1.00%(5)
Ratio of net investment income to average net assets(1) ..................          0.87%                   1.19%(5)
Portfolio turnover rate ..................................................        111.68%                  67.16%(6)

<FN>
   *   Commencement of operations.
  **   Calculated  based on shares  outstanding on the first and last day of the
       period,  except for dividends and distributions,  if any, which are based
       on actual shares outstanding on the dates of distributions.
  (1)  Reflects waivers and reimbursements.
  (2)  The amount shown for a share outstanding  throughout the period is not in
       accord with the change in the aggregate  gains and losses in  investments
       during the period because of the timing of sales and  repurchases of Fund
       shares in relation to  fluctuating  net asset value during the respective
       periods.
  (3)  Total return is calculated assuming a purchase of shares on the first day
       and a sale of  shares  on the last day of the  period  reported  and will
       include  reinvestments  of dividends  and  distributions,  if any.  Total
       return is not annualized.
  (4)  Until May 29, 1998, the Institutional  Class of the Fund paid .03% of its
       average  daily net assets to the  Fund's  previous  Distributor  in 12b-1
       fees. From May 29, 1998 through August 31, 1998, the Institutional  Class
       of  the  Fund  paid  .03%  of  its  average   daily  net  assets  to  the
       Administrative  Services  Agent pursuant to the  Administrative  Services
       Plan for Institutional  shares in lieu of 12b-1 fees.  Without the waiver
       of advisory,  12b-1,  administration  and transfer agent fees and without
       the reimbursement of certain operating expenses, the ratio of expenses to
       average net assets  annualized  for the period  ended August 31, 1997 and
       the year  ended  August  31,  1998  would  have  been  2.64%  and  1.49%,
       respectively, for the Institutional Class.
  (5)  Annualized.
  (6)  Not annualized.
</FN>
</TABLE>

                                       3
<PAGE>

INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
     The Fund's  investment  objective is to provide long-term growth of capital
with  current  income as a  secondary  objective.  The Fund seeks to achieve its
objective  by  investing  at least  65% of its  total  assets  in a  diversified
portfolio consisting  primarily of equity securities,  such as common stocks and
securities   convertible   into  common   stocks,   of  issuers  with  a  market
capitalization  of $1  billion  or  greater  and  identified  by the  Adviser as
possessing value characteristics.

     The   Adviser   examines   various   factors  in   determining   the  value
characteristics  of such issuers,  including,  but not limited to, price to book
value  ratios and price to  earnings  ratios.  These value  characteristics  are
examined in the context of the issuer's  operating  and  financial  fundamentals
such as return on equity, earnings growth and cash flow.

     The Adviser selects  securities for the Fund based on a continuous study of
trends  in  industries  and  companies,  earnings  power  and  growth  and other
investment criteria.  In general, the Fund's investments are broadly diversified
over a number of industries and, as a matter of policy, the Fund will not invest
25% or more of its total assets in any one industry.

     The Fund may invest up to 20% of its total assets in  securities of foreign
issuers.  Investing in securities of foreign issuers involves considerations not
typically  associated  with  investing in securities of companies  organized and
operated in the United States.  Foreign securities generally are denominated and
pay dividends or interest in foreign currencies.  The Fund may hold from time to
time various foreign  currencies  pending their investment in foreign securities
or their  conversion into U.S.  dollars.  The value of the assets of the Fund as
measured in U.S.  dollars may therefore be affected  favorably or unfavorably by
changes in exchange  rates.  There may be less  publicly  available  information
concerning  foreign  issuers  than is available  with  respect to U.S.  issuers.
Foreign  securities may not be registered with the U.S.  Securities and Exchange
Commission,  and  generally,  foreign  companies  are  not  subject  to  uniform
accounting,  auditing and financial reporting  requirements  comparable to those
applicable to U.S.  issuers.  See  "Investment  Objective and  Policies--Foreign
Securities" in the Statement of Additional Information.

     The Fund may invest the remainder of its total assets in equity  securities
of issuers with lower  capitalization;  derivative  securities;  debt securities
issued by U.S. banks,  corporations  and other business  organizations  that are
investment grade securities;  and debt securities issued by the U.S.  Government
or government agencies.

     In accordance with the above-mentioned  policies,  the Fund may also invest
in indexed securities, convertible securities, repurchase and reverse repurchase
agreements and dollar rolls,  financial  futures  contracts,  options on futures
contracts  and may lend  portfolio  securities.  See  "Investment  Objective and
Policies" in the Statement of Additional Information.

     The Fund may invest in registered investment companies and investment funds
in foreign countries subject to the provisions of the Investment  Company Act of
1940 (the "1940 Act") and as discussed in "Investment Objective and Policies" in
the Statement of Additional Information.  If the Fund invests in such investment
companies,  the Fund will bear its proportionate  share of the costs incurred by
such companies, including investment advisory fees.

     While the Adviser intends to fully invest the Fund's assets at all times in
accordance  with the above  mentioned  policies,  the Fund reserves the right to
hold up to 100% of its assets,  as a temporary  defensive  measure,  in cash and
eligible  U.S.  dollar-denominated  money market  instruments.  The Adviser will
determine when market conditions warrant temporary defensive measures.

     The Fund's  investment  objective and the policies  described  above may be
changed by RBB's Board of Directors  without the affirmative vote of the holders
of a majority of the outstanding Shares representing interests in the Fund.

                                       4
<PAGE>

INVESTMENT LIMITATIONS
- --------------------------------------------------------------------------------
     The  Fund may not  change  the  following  investment  limitations  without
shareholder approval. (A complete list of the investment limitations that cannot
be changed without such a vote of the shareholders is contained in the Statement
of Additional Information under "Investment Objective and Policies.")

     The Fund may not:

         1.  Purchase the  securities of any one issuer,  other than  securities
     issued  or   guaranteed   by  the  U.S.   Government  or  its  agencies  or
     instrumentalities,  if immediately  after and as a result of such purchases
     more than 5% of the value of the Fund's  total  assets would be invested in
     the securities of such issuer,  or more than 10% of the outstanding  voting
     securities of such issuer would be owned by the Fund, except that up to 25%
     of the value of the Fund's total assets may be invested  without  regard to
     such limitations.

         2. Purchase any securities  which would cause, at the time of purchase,
     25% or more of the value of the total  assets of the Fund to be invested in
     the obligations of issuers in any single  industry,  provided that there is
     no limitation with respect to investments in U.S. Government obligations.

         3. Borrow  money or issue senior  securities,  except that the Fund may
     borrow from banks and enter into reverse  repurchase  agreements and dollar
     rolls for temporary purposes in amounts up to one-third of the value of its
     total  assets  at the  time of  such  borrowing;  or  mortgage,  pledge  or
     hypothecate  any assets,  except in connection  with any such borrowing and
     then in amounts not in excess of one-third of the value of the Fund's total
     assets at the time of such borrowing. The Fund will not purchase securities
     while its aggregate  borrowings  (including reverse repurchase  agreements,
     dollar  rolls and  borrowings  from banks) are in excess of 5% of its total
     assets.  Securities held in escrow or separate  accounts in connection with
     the Fund's  investment  practices  are not  considered  to be borrowings or
     deemed to be pledged  for  purposes  of this  limitation.  

     If a percentage  restriction under one of the Fund's investment policies or
restrictions  or the use of assets is  adhered to at the time a  transaction  is
effected, later changes in percentage resulting from changing values will not be
considered a violation  (except with respect to any restrictions  that may apply
to borrowings or senior securities issued by the Fund).

RISK FACTORS
- --------------------------------------------------------------------------------
     As with other mutual  funds,  there can be no assurance  that the Fund will
achieve  its  objective.  The net asset  value per share of Shares  representing
interests in the Fund will  fluctuate as the values of its portfolio  securities
change in response to changing conditions in the equity market. An investment in
the Fund is not intended to constitute a balanced investment program. Other risk
factors are discussed above under "Investment Objective and Policies" and in the
Statement of Additional Information under "Investment Objective and Policies."

     European Currency Unification. Many European countries are about to adopt a
single  European  currency,  the euro. On January 1, 1999,  the euro will become
legal tender for all countries  participating in the Economic and Monetary Union
("EMU").  A new  European  Central  Bank will be created to manage the  monetary
policy of the new unified  region.  On the same date, the exchange rates will be
irrevocably  fixed between the EMU member  countries.  National  currencies will
continue to  circulate  until they are  replaced by euro coins and bank notes by
the middle of 2002.

     This change is likely to significantly  impact the European capital markets
in which the Fund may invest and may result in the Fund facing  additional risks
in pursuing its investment  objective.  These risks, which include,  but are not
limited  to,  uncertainty  as to  the  proper  tax  treatment  of  the  currency
conversion, volatility of currency exchange rates as a result of the conversion,
uncertainty  as to capital  market  reaction,  conversion  costs that may affect
issuer  profitability  and  creditworthiness,  and lack of participation by some
European  countries,  may increase the  volatility of the Fund's net asset value
per share.

                                       5
<PAGE>


YEAR 2000
- --------------------------------------------------------------------------------
     Like  other  mutual  funds,   financial  and  business   organizations  and
individuals  around  the  world,  the Fund could be  adversely  affected  if the
computer systems used by the Adviser and the Fund's other service providers,  or
persons with whom they deal, do not properly process and calculate  date-related
information  and data  from and after  January  1,  2000.  This  possibility  is
commonly known as the "Year 2000 Problem." The Year 2000 Problem could also hurt
companies whose securities the Fund holds or securities markets  generally.  The
Fund has been advised by the Adviser,  the Administrators and the Custodian that
they are actively  taking steps to address the Year 2000 Problem with respect to
the computer  systems  that they use and to obtain  assurances  that  comparable
steps are being taken by the Fund's other major service  providers.  While there
can be no  assurance  that  the  Fund's  service  providers  will be  Year  2000
compliant,  the Fund's service providers expect that their plans to be compliant
will be achieved.

ASSET ALLOCATION
- --------------------------------------------------------------------------------
     From time to time, the Fund may experience  relatively  large  purchases or
redemptions  due to asset  allocation  decisions made by the Advisor for clients
receiving Asset Allocation account management services involving  investments in
the Fund.  These  transactions  may have a  material  effect on the Fund,  since
redemptions  caused by  reallocations  may result in the Fund selling  portfolio
securities,  and  purchases  caused  by  reallocations  may  result  in the Fund
receiving additional cash that it will have to invest. While it is impossible to
predict  the  overall  impact of these  transactions  over time,  there could be
adverse  effects on  portfolio  management  to the  extent  that the Fund may be
required  to sell  securities  at times  when it would not  otherwise  do so, or
receive  cash  that  cannot  be  invested  in  an  expeditious   manner.   These
transactions  could also have tax consequences if the sale of securities results
in gains and could also increase  transaction costs. The Advisor is committed to
minimizing  the  impact  of such  transactions  on the Fund to the  extent it is
consistent  with  pursuing the  investment  objectives  of clients for which the
Advisor  provides  Asset  Allocation  account   management   services  involving
investments in the Fund and monitors the impact of asset allocation decisions on
the Fund.

GENERAL

     Investment  methods  described in this  Prospectus are among those that the
Fund has the power to utilize.  Some may be employed on a regular basis;  others
may not be used at all.  Accordingly,  reference  to any  particular  method  or
technique  carries no implication that it will be utilized or, if it is, that it
will be successful.

MANAGEMENT
- --------------------------------------------------------------------------------

BOARD OF DIRECTORS

     The  business  and  affairs  of RBB and the  Fund  are  managed  under  the
direction of RBB's Board of Directors.

INVESTMENT ADVISER

     Boston Partners Asset Management,  L.P.,  located at 28 State Street,  21st
Floor, Boston, Massachusetts 02109, serves as the Fund's investment adviser. The
Adviser  provides  investment  management  and investment  advisory  services to
investment  companies and other institutional  accounts that had aggregate total
assets under  management as of October 31, 1998 in excess of $16.0 billion.  The
adviser  is  organized  as a Delaware  limited  partnership  whose sole  general
partner is Boston Partners, Inc., a Delaware corporation.

     Subject to the supervision  and direction of RBB's Board of Directors,  the
Adviser manages the Fund's  portfolio in accordance  with the Fund's  investment
objective and policies,  makes investment  decisions for the Fund, places orders
to purchase and sell securities, and employs professional portfolio managers and
securities  analysts who provide research services to the Fund. For its services
to the Fund, the Adviser is entitled to receive under the Advisory

                                       6
<PAGE>

Agreement  a monthly  advisory  fee  computed  at an annual rate of 0.75% of the
Fund's  average daily net assets.  The Adviser  intends to limit Fund  operating
expenses to 1.00% of the Fund's average daily net assets.

PORTFOLIO MANAGEMENT

     The day-to-day  portfolio  management of the Fund is the  responsibility of
Mark E.  Donovan  and Wayne S. Sharp who are senior  portfolio  managers  of the
Adviser.  Mr. Donovan is Chairperson of the Adviser's Equity Strategy  Committee
which oversees the investment  activities of the Adviser's $5.5 billion in Large
Cap Value  institutional  equity assets under  management.  Prior to joining the
Adviser on April 16,  1995,  Mr.  Donovan was a Senior Vice  President  and Vice
Chairman of The Boston Company Asset Management, Inc.'s Equity Policy Committee.
Mr.  Donovan is a  Chartered  Financial  Analyst and has over  fifteen  years of
investment  experience.  Ms. Sharp is Vice  Chairperson of the Adviser's  Equity
Strategy Committee and has over twenty-one years of investment experience. Prior
to joining the Adviser on April 16, 1995,  Ms. Sharp was a Senior Vice President
and  member  of  the  Equity  Policy  Committee  of  The  Boston  Company  Asset
Management, Inc. Ms. Sharp is also a Chartered Financial Analyst.

ADMINISTRATOR

     PFPC  Inc.  ("PFPC")  serves  as  administrator  to the Fund and  generally
assists the Fund in all aspects of its administration and operations,  including
matters relating to the maintenance of financial records and accounting. For its
services,  PFPC is  entitled  to  receive  a fee  under  an  administration  and
accounting  services  agreement  calculated  at an  annual  rate of .125% of the
Fund's average daily net assets with a minimum fee of $75,000 payable monthly on
a pro rata basis.

TRANSFER AGENT, DIVIDEND DISBURSING AGENT, AND CUSTODIAN

     PFPC Trust Company, an indirect wholly-owned  subsidiary of PNC Bank Corp.,
will succeed PNC Bank, National Association ("PNC Bank") as the Fund's custodian
pursuant to an assignment. PNC Bank will continue to provide certain services to
PFPC Trust Company.  PFPC  serves as the  Fund's  transfer  agent  and  dividend
disbursing  agent.  The  principal  offices of PFPC,  an indirect,  wholly-owned
subsidiary  of PNC  Bank,  are  located  at 400  Bellevue  Parkway,  Wilmington,
Delaware  19809. PFPC may  enter  into  shareholder  servicing  agreements  with
registered  broker-dealers  who have  entered  into dealer  agreements  with the
Distributor  ("Authorized  Dealers")  for the  provision of certain  shareholder
support services to customers of such Authorized Dealers who are shareholders of
the Fund.  The  services  provided  and the fees  payable  by the Fund for these
services  are  described  in  the  Statement  of  Additional  Information  under
"Investment Advisory, Distribution and Servicing Arrangements."

ADMINISTRATIVE SERVICES AGENT

     Provident Distributors,  Inc. ("PDI"), with a principal business address at
Four Falls Corporate Center,  West Conshohocken,  Pennsylvania  19428,  provides
certain administrative services to the Fund's Institutional Shares not otherwise
provided by PFPC.  PDI furnishes  certain  internal  quasi-legal,  executive and
administrative  services to the Fund, acts as a liaison between the Fund and its
various  service  providers and  coordinates  and assists in the  preparation of
reports  prepared on behalf of the Fund. For its services,  PDI is entitled to a
monthly  fee  calculated  at the annual rate of .15% of the  respective  average
daily net assets of the Fund's  Institutional  Class.  PDI is currently  waiving
fees  in  excess  of  .03%  of the  average  daily  net  assets  of  the  Fund's
Institutional Class.

DISTRIBUTOR

     PDI acts as distributor for the Shares pursuant to a distribution agreement
(the "Distribution Agreement") with RBB on behalf of the Shares.

                                       7
<PAGE>

EXPENSES

     The  expenses  of the  Fund  are  deducted  from its  total  income  before
dividends  are  paid.  Any  general   expenses  of  RBB  that  are  not  readily
identifiable  as belonging to a particular  investment  portfolio of RBB will be
allocated  among all  investment  portfolios  of RBB based upon the relative net
assets of the investment portfolios. The Institutional Class of the Fund pays an
administrative  services  fee,  and may pay a  different  share  than the  other
classes of the Fund of other expenses (excluding advisory and custodial fees) if
those expenses are actually  incurred in a different amount by the Institutional
Class or if it receives different services.

     The  Adviser  may  assume  expenses  of the Fund from time to time.  To the
extent any service  providers  assume  expenses of the Fund,  such assumption of
expenses will have the effect of lowering the Fund's  overall  expense ratio and
of increasing its yield to investors.

HOW TO PURCHASE SHARES
- --------------------------------------------------------------------------------

GENERAL

     Shares representing interests in the Fund are offered continuously for sale
by the  Distributor and may be purchased  without  imposition of a sales charge.
Shares may be purchased initially by completing the application included in this
Prospectus and forwarding the application to the Fund's  transfer  agent,  PFPC.
Purchases  of Shares may be  effected by wire to an account to be  specified  by
PFPC or by mailing a check or  Federal  Reserve  Draft,  payable to the order of
"The  Boston  Partners  Large Cap Value  Fund,"  c/o PFPC Inc.,  P.O.  Box 8852,
Wilmington,  Delaware  19899-8852.  Shareholders  may not purchase shares of the
Boston  Partners  Large Cap Value Fund with a check  issued by a third party and
endorsed over to the Fund. The name of the Fund, Boston Partners Large Cap Value
Fund,  must also appear on the check or Federal  Reserve Draft.  Federal Reserve
Drafts are  available  at national  banks or any state bank which is a member of
the Federal  Reserve  System.  Initial  investments in the Fund must be at least
$100,000 and  subsequent  investments  must be at least $5,000.  For purposes of
meeting the minimum  initial  purchase,  clients  which are part of  endowments,
foundations  or other related  groups may be  aggregated.  The Fund reserves the
right to suspend  the  offering  of Shares for a period of time or to reject any
purchase order.

     Shares may be purchased on any  Business  Day. A "Business  Day" is any day
that the New York  Stock  Exchange,  Inc.  (the  "NYSE")  is open for  business.
Currently,  the NYSE is closed on weekends and New Year's Day, Dr. Martin Luther
King, Jr. Day,  Presidents' Day, Good Friday,  Memorial Day,  Independence  Day,
Labor Day,  Thanksgiving  Day and Christmas Day, and on the preceding  Friday or
subsequent Monday when one of these holidays falls on a Saturday or Sunday.

     The price paid for Shares  purchased  is based on the net asset  value next
computed  after a purchase  order is  received  in good order by the Fund or its
agents. Orders received by the Fund or its agents prior to the close of the NYSE
(generally  4:00 p.m.  Eastern Time) are priced at that Business Day's net asset
value.  Orders  received  by the Fund or its agents  after the close of the NYSE
(generally  4:00 p.m.  Eastern  Time) are  priced  at the net asset  value  next
determined on the following  Business Day. In those cases where an investor pays
for Shares by check,  the purchase  will be effected at the net asset value next
determined  after the Fund or its agents  receives  the order and the  completed
application.

     Shares  may  be  purchased  and  subsequent  investments  may  be  made  by
principals  and  employees of the Adviser,  and by their  spouses and  children,
either  directly or through their  individual  retirement  accounts,  and by any
pension and  profit-sharing  plan of the Adviser,  without  being subject to the
minimum investment limitations.

     An investor may also purchase  Shares by having his bank or his broker wire
Federal Funds to PFPC. An investor's bank or broker may impose a charge for this
service.  The Fund does not currently impose a service charge for effecting wire
transfers  but  reserves  the right to do so in the  future.  In order to ensure
prompt receipt of an investor's Federal Funds wire for an initial investment, it
is important that an investor follows these steps:

                                       8
<PAGE>

         A. Telephone the Fund's transfer agent, PFPC, toll-free (888) 261-4073,
     and provide PFPC with your name, address, telephone number, Social Security
     or Tax Identification  Number,  the Fund selected,  the amount being wired,
     and by which bank.  PFPC will then provide an investor  with a Fund account
     number.  Investors with existing  accounts should also notify PFPC prior to
     wiring funds.

         B. Instruct your bank or broker to wire the specified amount,  together
     with your assigned account number, to PFPC's account with PNC:

                  PNC Bank, N.A.
                  Philadelphia, PA 19103
                  ABA NUMBER: 0310-0005-3
                  CREDITING ACCOUNT NUMBER: 86-1108-2507
                  FROM: (name of investor)
                  ACCOUNT NUMBER: (Investor's account number with the Fund)
                  FOR PURCHASE OF: Boston Partners Large Cap Value Fund
                  AMOUNT: (amount to be invested)

         C. Fully complete and sign the  application  and mail it to the address
     shown thereon.  PFPC will not process redemptions until it receives a fully
     completed and signed Application.

     For subsequent investments, an investor should follow steps A and B above.

AUTOMATIC INVESTING

     Additional  investments in Shares may be made  automatically by authorizing
the Fund's  transfer agent to withdraw  funds from your bank account.  Investors
desiring to  participate  in the  automatic  investing  program  should call the
Fund's transfer agent, PFPC, at (888) 261-4073 to obtain the appropriate forms.

HOW TO REDEEM AND EXCHANGE SHARES
- --------------------------------------------------------------------------------

REDEMPTION BY MAIL

     Shareholders may redeem for cash some or all of their Shares of the Fund at
any time.  To do so, a written  request in proper form must be sent  directly to
Boston Partners Large Cap Value Fund, c/o PFPC Inc., P.O. Box 8852,  Wilmington,
Delaware 19899-8852. There is no charge for a redemption.

     A request for  redemption  must be signed by all persons in whose names the
Shares  are   registered.   Signatures  must  conform  exactly  to  the  account
registration.  If the proceeds of the redemption would exceed $10,000, or if the
proceeds are not to be paid to the record owner at the record address, or if the
shareholder is a corporation, partnership, trust or fiduciary, signature(s) must
be guaranteed  according to the procedures  described below under "How to Redeem
and Exchange Shares -- Exchange Privilege."

     Generally,  a properly signed written  request with any required  signature
guarantee  is all that is required  for a  redemption.  In some cases,  however,
other  documents may be  necessary.  In the case of  shareholders  holding share
certificates,  the certificates for the shares being redeemed must accompany the
redemption  request.  Additional  documentary  evidence  of  authority  is  also
required by the Fund's transfer agent in the event  redemption is requested by a
corporation, partnership, trust, fiduciary, executor or administrator.

                                       9
<PAGE>

INVOLUNTARY REDEMPTION

     The Fund reserves the right to redeem a  shareholder's  account at any time
the  net  asset  value  of the  account  falls  below  $500 as the  result  of a
redemption or an exchange request. Shareholders will be notified in writing that
the value of their account is less than $500 and will be allowed 30 days to make
additional investments before the redemption is processed.

PAYMENT OF REDEMPTION PROCEEDS

     In all cases,  the  redemption  price is the net asset value per share next
determined  after the request for  redemption  is received in proper form by the
Fund or its agents.  Payment for Shares  redeemed is made by check mailed within
seven days after  acceptance  by the Fund or its agents of the  request  and any
other necessary  documents in proper order. Such payment may be postponed or the
right of  redemption  suspended  as  permitted  by the rules of the SEC.  If the
Shares to be redeemed have been recently purchased by check, the Fund's transfer
agent may delay  mailing a redemption  check,  which may be a period of up to 15
days, pending a determination  that the check has cleared.  The Fund has elected
to be governed by Rule 18f-1 under the 1940 Act so that a portfolio is obligated
to redeem its shares  solely in cash up to the lesser of  $250,000  or 1% of its
net asset value during any 90-day period for any one shareholder of a portfolio.

EXCHANGE PRIVILEGE

     The exchange  privilege is available to shareholders  residing in any state
in which the Shares  being  acquired  may be legally  sold.  A  shareholder  may
exchange  Shares  of the Fund  for  Institutional  Shares  of any  other  Boston
Partners  Fund  of  RBB,  subject  to  restrictions  described  under  "Exchange
Privilege  Limitations"  below.  Such exchange will be effected at the net asset
value of the exchanged  Fund and the net asset value of the Fund being  acquired
next  determined  after  receipt of a request for an exchange by the Fund or its
agents.  An exchange of Shares will be treated as a sale for federal  income tax
purposes.  See "Taxes." A  shareholder  wishing to make an exchange may do so by
sending a written request to PFPC.

     If the exchanging  shareholder does not currently own Institutional  Shares
of the Boston  Partners  Fund into which he/she  would like to  exchange,  a new
account will be  established  with the same  registration,  dividend and capital
gain options as the account from which shares are  exchanged,  unless  otherwise
specified  in writing  by the  shareholder  with all  signatures  guaranteed.  A
signature  guarantee  may be  obtained  from a domestic  bank or trust  company,
broker, dealer, clearing agency or savings association who are participants in a
medallion program recognized by the Securities Transfer  Association.  The three
recognized  medallion programs are Securities  Transfer Agents Medallion Program
(STAMP),  Stock Exchanges  Medallion Program (SEMP) and New York Stock Exchange,
Inc. Medallion Signature Program (MSP).  Signature  guarantees that are not part
of these programs will not be accepted.  The exchange  privilege may be modified
or  terminated  at any time, or from time to time, by RBB, upon 60 days' written
notice to shareholders.

     If an exchange is to a new account in the acquired  Fund,  the dollar value
of Shares  acquired must equal or exceed that Fund's  minimum for a new account;
if to an  existing  account,  the dollar  value must equal or exceed that Fund's
minimum for subsequent investments. If any amount remains in the Fund from which
the exchange is being made,  such amount must not drop below the minimum account
value required by the Fund.

EXCHANGE PRIVILEGE LIMITATIONS

     The Fund's exchange privilege is not intended to afford  shareholders a way
to speculate on  short-term  movements in the market.  Accordingly,  in order to
prevent excessive use of the exchange privilege that may potentially disrupt the
management of the Fund and increase transactions costs, the Fund has established
a policy of limiting excessive exchange activity.

                                       10
<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>

BOSTON PARTNERS LARGE CAP VALUE FUND     bp
        (INSTITUTIONAL CLASS)            BOSTON PARTNERS ASSET MANAGEMENT, L.P.
                                         --------------------------------------

ACCOUNT APPLICATION

PLEASE NOTE: Do not use this form to open a retirement plan account. For an IRA
application or help with this Application, please call 1-888-261-4073.

                  (Please check the appropriate box(es) below.)

- -------------------
1.
Account
Registration:
- -------------------

|_|  Individual           |_|  Joint Tenant          |_|  Other

- --------------------------------------------------------------------------------
Name                         SOCIAL SECURITY NUMBER OR TAX ID # OF PRIMARY OWNER

- --------------------------------------------------------------------------------
NAME OF JOINT OWNER               JOINT OWNER SOCIAL SECURITY NUMBER OR TAX ID #


For joint accounts, the account registrants will be
joint tenants with right of survivorship and not
tenants in common unless tenants in common or community
property registrations are requested.

- -------------------
GIFT TO MINOR: 
- -------------------

 |_|  UNIFORM GIFTS/TRANSFER TO MINOR'S ACT

- --------------------------------------------------------------------------------
 NAME OF ADULT CUSTODIAN (ONLY ONE PERMITTED)

- --------------------------------------------------------------------------------
 NAME OF MINOR (ONLY ONE PERMITTED)

- --------------------------------------------------------------------------------
 MINOR'S SOCIAL SECURITY NUMBER AND DATE OF BIRTH

- -------------------
CORPORATION,
PARTNERSHIP, TRUST
OR OTHER ENTITY:
- -------------------

- -------------------
2.
Mailing
Address:
- -------------------

- --------------------------------------------------------------------------------
NAME OF CORPORATION, PARTNERSHIP, OR OTHER                 NAME(S) OF TRUSTEE(S)

- --------------------------------------------------------------------------------
TAXPAYER IDENTIFICATION NUMBER

- --------------------------------------------------------------------------------
STREET OR P.O. BOX AND/OR APARTMENT NUMBER

- --------------------------------------------------------------------------------
CITY                                     STATE                         ZIP CODE

- --------------------------------------------------------------------------------
DAY PHONE NUMBER                                            EVENING PHONE NUMBER

- -------------------
3
Investment
Information:
- -------------------

Minimum initial investment of $100,000        Amount of investment $____________

Make the check payable to Boston Partners Large Cap Value Fund.

Shareholders may not purchase shares of this Fund with a check issued by a third
party and endorsed over to the Fund.

- -------------------
DISTRIBUTION 
OPTIONS:     
- -------------------

NOTE: Dividends and capital gains may be reinvested or paid by check. If no
options are selected below, both dividends and capital gains will be reinvested
in additional Fund shares.

DIVIDENDS |_| Pay by check |_| Reinvest |_| CAPITAL GAINS |_| Pay by check |_|
Reinvest |_|

<PAGE>

- -------------------
4
Telephone
Redemption:
- -------------------

To use this option, you must initial the appropriate line below. 

I authorize the Transfer Agent to accept instructions from any persons to redeem
or exchange shares in my account(s) by telephone in accordance with the
procedures and conditions set forth in the Fund's current prospectus.

______________________    __________________________   Redeem shares, and send 
individual initial             joint initial           the proceeds to the     
                                                       address of record.      
                                                     


______________________    __________________________   Exchange shares for     
individual initial             joint initial           shares of The Boston    
                                                       Partners Mid Cap Value  
                                                       Fund, Bond Fund, Micro  
                                                       Cap Value Fund or Market
                                                       Neutral Fund.
                                                       


- -------------------
5
Automatic
Investment
Plan:
- -------------------

The Automatic Investment Plan, which is available to shareholders of the Fund,
makes possible regularly scheduled purchases of Fund shares to allow dollar-cost
averaging. The Fund's Transfer Agent can arrange for an amount of money selected
by you to be deducted from your checking account and used to purchase shares of
the Fund.

Please debit $________ from my checking account (named below) on or about the
20th of the month. Please attach an unsigned, voided check.

|_|  Monthly     |_|  Every Alternate Month |_|  Quarterly   |_|  Other

- -------------------
BANK OF RECORD:
- -------------------

- --------------------------------------------------------------------------------
BANK NAME                                        STREET ADDRESS OR P.O. BOX

- --------------------------------------------------------------------------------
CITY                     STATE                                    ZIP CODE

- --------------------------------------------------------------------------------
BANK ABA NUMBER                                         BANK ACCOUNT NUMBER


- -------------------
6

Signatures:
- -------------------


The undersigned warrants that I (we) have full authority and, if a natural
person, I (we) am (are) of legal age to purchase shares pursuant to this Account
Application, and I (we) have received a current prospectus for the Fund in which
I (we) am (are) investing. 

Under the Interest and Dividend Tax Compliance Act of 1983, the Fund is required
to have the following certification:

Under penalties of perjury, I certify that:

(1) The number shown on this form is my correct taxpayer identification number
(or I am waiting for a number to be issued to me), and 

(2) I am not subject to backup withholding because (a) I am exempt from backup
withholding, or (b) I have not been notified by the Internal Revenue Service
that I am subject to 31% backup withholding as a result of a failure to report
all interest or dividends, or (c) the IRS has notified me that I am no longer
subject to backup withholding.

NOTE: YOU MUST CROSS OUT ITEM (2) ABOVE IF YOU HAVE BEEN NOTIFIED BY THE IRS
THAT YOU ARE CURRENTLY SUBJECT TO BACKUP WITHHOLDING BECAUSE YOU HAVE FAILED TO
REPORT ALL INTEREST AND DIVIDENDS ON YOUR TAX RETURN. THE INTERNAL REVENUE
SERVICE DOES NOT REQUIRE YOUR CONSENT TO ANY PROVISION OF THIS DOCUMENT OTHER
THAN THE CERTIFICATION REQUIRED TO AUDIT BACKUP WITHHOLDING.

- --------------------------------------------------------------------------------
SIGNATURE OF APPLICANT                                          DATE

- --------------------------------------------------------------------------------
PRINT NAME                                                TITLE (IF APPLICABLE)

- --------------------------------------------------------------------------------
SIGNATURE OF JOINT OWNER                                        DATE


- --------------------------------------------------------------------------------
PRINT NAME                                                TITLE (IF APPLICABLE)


(If you are signing for a corporation, you must indicate corporate office or
title. If you wish additional signatories on the account, please include a
corporate resolution. If signing as a fiduciary, you must indicate capacity.)

For information on additional options, such as IRA Applications, rollover
requests for qualified retirement plans, or for wire instructions, please call
us at 1-888-261-4073.

MAIL COMPLETED ACCOUNT APPLICATION AND CHECK TO: THE BOSTON PARTNERS LARGE CAP
                                                 VALUE FUND
                                                 C/O PFPC INC.
                                                 P.O. BOX 8852
                                                 WILMINGTON, DE  19899-8852
<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>

     Shareholders are entitled to six (6) exchange redemptions (at least 30 days
apart)  from the Fund  during any  twelve-month  period.  Notwithstanding  these
limitations,  the  Fund  reserves  the  right to  reject  any  purchase  request
(including  purchases by exchange)  that is deemed to be disruptive to efficient
portfolio management.

TELEPHONE TRANSACTIONS

     In order to request an exchange or redemption  by telephone,  a shareholder
must  have  completed  and  returned  an  account  application   containing  the
appropriate telephone election. To add a telephone option to an existing account
that previously did not provide for this option, a Telephone  Authorization Form
must be filed with PFPC.  This form is available  from PFPC.  Once this election
has been made, the  shareholder  may simply contact PFPC by telephone to request
the exchange or redemption by calling (888) 261-4073. Neither RBB, the Fund, the
Distributor,  the  Administrator nor any Fund agent will be liable for any loss,
liability,  cost or expense for following RBB's telephone transaction procedures
described  below or for following  instructions  communicated  by telephone that
they reasonably believe to be genuine.

     RBB's telephone transaction  procedures include the following measures: (1)
requiring the appropriate  telephone  transaction privilege forms; (2) requiring
the  caller to provide  the names of the  account  owners,  the  account  social
security number and name of the Fund, all of which must match RBB's records; (3)
requiring RBB's service representative to complete a telephone transaction form,
listing  all of the above  caller  identification  information;  (4)  permitting
exchanges only if the two account  registrations  are  identical;  (5) requiring
that  redemption  proceeds be sent only by check to the account owners of record
at the  address of  record,  or by wire only to the owners of record at the bank
account  of  record;  (6)  sending a  written  confirmation  for each  telephone
transaction  to the owners of record at the  address of record  within  five (5)
Business Days of the call; and (7) maintaining  tapes of telephone  transactions
for six months, if the Fund elects to record shareholder telephone transactions.
For  accounts  held of record by  broker-dealers  (other than the  Distributor),
financial  institutions,   securities  dealers,  financial  planners  and  other
industry  professionals,  additional  documentation or information regarding the
scope of a caller's authority is required.  Finally, for telephone  transactions
in accounts held jointly, additional information regarding other account holders
is required. Telephone transactions will not be permitted in connection with IRA
or other  retirement  plan accounts or by an  attorney-in-fact  under a power of
attorney.

NET ASSET VALUE
- --------------------------------------------------------------------------------
     The net asset  value for each class of a fund is  calculated  by adding the
value of the proportionate  interest of the class in a fund's  securities,  cash
and other assets,  deducting the actual and accrued liabilities of the class and
dividing by the result of outstanding  shares of the class.  The net asset value
of each class is  calculated  independently  of each other class.  The net asset
values are calculated as of 4:00 p.m. Eastern Time on each Business Day.

     Valuation of securities held by the Fund is as follows:  securities  traded
on a national  securities  exchange or on the NASDAQ  National Market System are
valued at the last reported sale price that day; securities traded on a national
securities exchange or on the NASDAQ National Market System for which there were
no sales on that day and securities traded on other over-the-counter markets for
which market  quotations are readily available are valued at the mean of the bid
and asked prices;  and  securities  for which market  quotations are not readily
available  are valued at fair  market  value as  determined  in good faith by or
under the  direction of RBB's Board of Directors.  The amortized  cost method of
valuation may also be used with respect to debt  obligations  with sixty days or
less remaining to maturity.

     With the approval of RBB's Board of  Directors,  the Fund may use a pricing
service,  bank or broker-dealer  experienced in such matters to value the Fund's
securities. A more detailed discussion of net asset value and security valuation
is contained in the Statement of Additional Information.

                                       11
<PAGE>

DIVIDENDS AND DISTRIBUTIONS
- --------------------------------------------------------------------------------
     The Fund will distribute substantially all of the net investment income and
net realized capital gains, if any, of the Fund to the Fund's shareholders.  All
distributions  are  reinvested  in the form of  additional  full and  tractional
Shares unless a shareholder elects otherwise.

     The Fund will declare and pay dividends from net investment income annually
and pays them in the  calendar  year in which they are  declared,  generally  in
December.  Net realized capital gains (including net short-term  capital gains),
if any, will be distributed at least annually.

TAXES
- --------------------------------------------------------------------------------
     The  following  discussion is only a brief summary of some of the important
tax considerations  generally affecting the Fund and its shareholders and is not
intended as a substitute for careful tax planning. Accordingly, investors in the
Fund should consult their tax advisers with specific  reference to their own tax
situation.

     The Fund  will  elect to be taxed as a  regulated  investment  company  for
federal  income  tax  purposes.  So long as the  Fund  qualifies  for  this  tax
treatment,  it will be relieved of federal income tax on amounts  distributed to
shareholders. The Fund intends to make sufficient actual or deemed distributions
prior to the end of each calendar year to avoid  liability for federal income or
excise tax.

     Fund  distributions  to  shareholders,  unless  otherwise  exempt,  will be
taxable (except  distributions  that are treated for federal income tax purposes
as a return of capital)  regardless of whether the distributions are received in
cash or reinvested in additional  shares.  Distributions out of the "net capital
gain" (the excess of net  long-term  capital  gain over net  short-term  capital
loss), if any, of a Fund will be taxed to shareholders as long-term capital gain
regardless  of the length of time a shareholder  has held his Shares.  All other
taxable distributions are taxed to shareholders as ordinary income.

     RBB will send written  notices to shareholders  annually  regarding the tax
status  of  distributions  made by the  Fund.  Dividends  declared  in  October,
November  or  December  of any year  payable  to  shareholders  of  record  on a
specified  date in such a month  will be  deemed to have  been  received  by the
shareholders  on December 31, if such  dividends are paid during  January of the
following year.

     Investors  should be careful to  consider  the tax  implications  of buying
shares just prior to a distribution.  The price of shares purchased at that time
will  reflect  the  amount  of the  forthcoming  distribution.  Those  investors
purchasing shares just prior to a distribution will nevertheless be taxed on the
entire amount of the  distribution  received,  although the  distribution is, in
effect, a return of capital.

     Shareholders  who sell or redeem shares,  or exchange  shares  representing
interests in one Fund for shares  representing  interests in another Fund,  will
generally  recognize  capital gain or loss for federal income tax purposes.  The
gain or loss will be long-term capital gain or loss if the shares have been held
for more than twelve  months,  and short-term  otherwise,  except that a loss on
shares held six months or less will be treated as long-term  capital loss to the
extent of any capital gains distribution received on the shares.

     Shareholders  who are  nonresident  alien  individuals,  foreign  trusts or
estates,  foreign  corporations or foreign partnerships are generally subject to
different  U.S.  Federal  income tax treatment  from that  described  above.  In
particular,  such  shareholders  will  generally not be subject to U.S.  federal
income  tax on  capital  gains on or with  respect  to their  shares,  and other
distributions  to them will be subject to 30% withholding tax unless such tax is
reduced or eliminated under an applicable tax treaty.

                                       12
<PAGE>


MULTI-CLASS STRUCTURE
- --------------------------------------------------------------------------------
     The Fund  offers one other  class of  shares,  Investor  Shares,  which are
offered  directly to individual  investors,  pursuant to separate  prospectuses.
Shares of each class  represent  equal pro rata interests in the Fund and accrue
dividends and calculate net asset value and  performance  quotations in the same
manner.  The Fund will quote  performance of the Investor Shares separately from
Institutional  Shares.  Because of different  expenses paid by the Institutional
Shares,  the total  return on such shares can be  expected,  at any time,  to be
different than the total return on Investor Shares.  Information concerning this
other class may be obtained by calling the Fund at (888) 261-4073.

DESCRIPTION OF SHARES
- --------------------------------------------------------------------------------
     RBB has authorized  capital of thirty billion shares of Common Stock, $.001
par value per share,  of which 97 billion shares are currently  classified  into
18.326  different  classes of Common Stock.  See  "Description of Shares" in the
Statement of Additional Information."

     THIS  PROSPECTUS AND THE STATEMENT OF ADDITIONAL  INFORMATION  INCORPORATED
HEREIN  RELATE  PRIMARILY TO BOSTON  PARTNERS  LARGE CAP VALUE FUND AND DESCRIBE
ONLY THE  INVESTMENT  OBJECTIVE  AND POLICIES,  OPERATIONS,  CONTRACTS AND OTHER
MATTERS RELATING TO BOSTON PARTNERS LARGE CAP VALUE FUND.

     Each  share  that   represents  an  interest  in  the  Fund  has  an  equal
proportionate interest in the assets belonging to the Fund with each other share
that  represents  an  interest  in the Fund,  even where a share has a different
class  designation  than  another  share  representing  an interest in the Fund.
Shares of the Fund do not have preemptive or conversion rights.  When issued for
payment  as  described  in this  Prospectus,  Shares  will  be  fully  paid  and
non-assessable.

     RBB  currently  does not intend to hold  annual  meetings  of  shareholders
except  as  required  by the 1940 Act or other  applicable  law.  The law  under
certain circumstances provides shareholders with the right to call for a meeting
of shareholders to consider the removal of one or more directors.  To the extent
required  by law,  the Fund will  assist in  shareholder  communication  in such
matters.

     Holders of Shares of the Fund will vote in the  aggregate  and not by class
on all matters, except where otherwise required by law. Further, shareholders of
all investment portfolios of RBB will vote in the aggregate and not by portfolio
except as otherwise required by law or when RBB's Board of Directors  determines
that the matter to be voted upon affects only the interests of the  shareholders
of  a  particular  investment  portfolio.   (See  the  Statement  of  Additional
Information under "Additional  Information  Concerning Fund Shares" for examples
when the  1940  Act  requires  voting  by  investment  portfolio  or by  class.)
Shareholders  of the Fund are  entitled  to one vote for each  full  share  held
(irrespective of class or portfolio) and fractional votes for fractional  shares
held.  Voting rights are not cumulative  and,  accordingly,  the holders of more
than 50% of the  aggregate  shares of Common  Stock of the Fund may elect all of
the directors.

     As of November 16, 1998, to the Fund's knowledge,  no person held of record
or beneficially 25% or more of the outstanding shares of all classes of RBB.

                                       13
<PAGE>


OTHER INFORMATION
- --------------------------------------------------------------------------------

REPORTS AND INQUIRIES

     Shareholders  will receive  unaudited  semi-annual  reports  describing the
Fund's  investment   operations  and  annual  financial  statements  audited  by
independent accountants. Shareholder inquiries should be addressed to the Fund's
transfer agent,  PFPC, at Bellevue Park Corporate Center,  400 Bellevue Parkway,
Wilmington, Delaware 19809, toll-tree (888) 261-4073.

SHARE CERTIFICATES

     In  the  interest  of  economy  and  convenience,   physical   certificates
representing Shares in the Fund are not normally issued.

HISTORICAL PERFORMANCE INFORMATION

     For the period from  commencement  of operations  (January 2, 1997) through
August 31, 1998,  the total  return since  inception  (not  annualized)  for the
Institutional Class of Shares of the Fund was as follows:

     Unannualized investment returns for the period ended August 31, 1998

                                                                        Since
                                                                      Inception
                                                                      ---------
     Boston Partners Large Cap Value Fund
         (Institutional Shares) ...................................      11.85%

     The total return  assumes  reinvestment  of all dividends and capital gains
and  reflects  expense  reimbursements  and  investment  advisory fee waivers in
effect.  Without these expense reimbursements or waivers, the Fund's performance
would have been lower.  Of course,  past  performance  is no guarantee of future
results.  Investment return and principal value will fluctuate,  so that Shares,
when  redeemed,  may be worth  more or less  than the  original  cost.  For more
information on performance,  see  "Performance  Information" in the Statement of
Additional Information.

     The table below  presents the Composite  performance  history of certain of
the  Adviser's  managed  accounts on an  annualized  basis for the period  ended
August 31, 1998.  The  Composite is  comprised  of the  Adviser's  institutional
accounts  and other  privately  managed  accounts  with  investment  objectives,
policies and strategies substantially similar to those of the Fund, although the
accounts  have  longer  operating  histories  than  the  Fund,  which  commenced
operations on January 2, 1997. The Composite  performance  information  includes
the reinvestment of dividends received in the underlying securities and reflects
investment  advisory fees. The privately  managed  accounts in the Composite are
only  available  to the  Adviser's  institutional  advisory  clients.  The  past
performance  of the accounts  which  comprise the Composite is not indicative of
the  future  performance  of the Fund.  These  accounts  have  lower  investment
advisory fees than the Fund,  and the Composite  performance  figures would have
been  lower if subject to the higher  fees and  expenses  incurred  by the Fund.
These private accounts are also not subject to the same investment  limitations,
diversification  requirements  and other  restrictions,  which are imposed  upon
mutual  funds  under  the 1940 Act and the  Internal  Revenue  Code,  which,  if
imposed,  may have adversely affected the performance  results of the Composite.
Listed below the  performance  history for the Composite is a comparative  index
comprised  of  securities  similar to those in which  accounts  contained in the
Composite are invested.

                                       14
<PAGE>

     Annualized investment returns for the period ended August 31, 1998

                                                                        Since
                                                    One Year         Inception*
                                                    --------         ----------
     Composite Performance .......................   (14.68)%            6.97%
     S&P 500 Stock Index .........................     8.11%            18.64%

* The Adviser commenced managing these accounts on January 2, 1997.

     The S&P 500  Stock  Index  is an  unmanaged  index of 500  selected  common
stocks, most of which are listed on the NYSE.

FUTURE PERFORMANCE INFORMATION

     From  time to time,  the  Fund may  advertise  its  performance,  including
comparisons  to other  mutual funds with similar  investment  objectives  and to
stock or other relevant indices.  All such  advertisements will show the average
annual total return over one, five and ten year periods or, if such periods have
not yet elapsed,  shorter  periods  corresponding  to the life of the Fund. Such
total  return  quotations  will be computed by finding  the  compounded  average
annual total  return for each time period that would equate the assumed  initial
investment of $1,000 to the ending redeemable value, net of fees, according to a
required standardized  calculation.  The standard calculation is required by the
SEC to provide consistency and comparability in investment company  advertising.
The Fund may also from time to time  include in such  advertising  an  aggregate
total return figure or a total return figure that is not calculated according to
the  standardized  formula  in order  to  compare  more  accurately  the  Fund's
performance with other measures of investment  return.  For example,  the Fund's
total return may be compared with data published by Lipper Analytical  Services,
Inc., CDA  Investment  Technologies,  Inc. or  Weisenberger  Investment  Company
Service, or with the performance of the Standard & Poor's 500 Stock Index or the
Dow  Jones  Industrial  Average.   Performance   information  may  also  include
evaluation of the Fund by nationally recognized ranking services and information
as  reported  in  financial   publications  such  as  Business  Week,   Fortune,
Institutional  Investor,  Money  Magazine,  Forbes,  Barron's,  The Wall  Street
Journal, The New York Times, or other national,  regional or local publications.
All advertisements  containing performance data will include a legend disclosing
that such  performance  data represents past performance and that the investment
return and principal value of an investment will fluctuate so that an investor's
Shares, when redeemed, may be worth more or less than their original cost.

                                       15
<PAGE>

NO  PERSON  HAS  BEEN   AUTHORIZED   TO  GIVE  ANY   INFORMATION   OR  MAKE  ANY
REPRESENTATIONS  NOT  CONTAINED  IN THIS  PROSPECTUS  OR IN RBB'S  STATEMENT  OF
ADDITIONAL INFORMATION  INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE
OFFERING MADE BY THIS  PROSPECTUS  AND, IF GIVEN OR MADE,  SUCH  REPRESENTATIONS
MUST NOT BE RELIED UPON AS HAVING  BEEN  AUTHORIZED  BY RBB OR ITS  DISTRIBUTOR.
THIS  PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY RBB OR BY THE DISTRIBUTOR IN
ANY JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY BE MADE.

                              ---------------------
                                TABLE OF CONTENTS
                                                                            PAGE
                                                                            ----
INTRODUCTION. ...........................................................     2
FINANCIAL HIGHLIGHTS. ...................................................     2
INVESTMENT OBJECTIVES AND POLICIES. .....................................     4
INVESTMENT LIMITATIONS. .................................................     5
RISK FACTORS. ...........................................................     5
YEAR 2000 ...............................................................     6
ASSET ALLOCATION ........................................................     6
MANAGEMENT. .............................................................     6
HOW TO PURCHASE SHARES ..................................................     8
HOW TO REDEEM AND EXCHANGE SHARES. ......................................     9
NET ASSET VALUE. ........................................................    11
DIVIDENDS AND DISTRIBUTIONS. ............................................    12
TAXES. ..................................................................    12
MULTI-CLASS STRUCTURE. ..................................................    13
DESCRIPTION OF SHARES. ..................................................    13
OTHER INFORMATION. ......................................................    14
                                                                      
INVESTMENT ADVISER
Boston Partners Asset Management, L.P.
Boston, Massachusetts

CUSTODIAN
PFPC Trust Company
Wilmington, Delaware

TRANSFER AGENT AND ADMINISTRATOR
PFPC Inc.
Wilmington, Delaware

DISTRIBUTOR AND ADMINISTRATIVE SERVICES AGENT
Provident Distributors, Inc.
West Conshohocken, Pennsylvania

COUNSEL
Drinker Biddle & Reath LLP
Philadelphia, Pennsylvania

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers LLP
Philadelphia, Pennsylvania

[GRAPHIC OMITTED]


<PAGE>
          PROSPECTUS
       DECEMBER 29, 1998

                                 BOSTON PARTNERS
                                    LARGE CAP
                                   VALUE FUND

                                (INVESTOR SHARES)

bp
BOSTON PARTNERS ASSET MANAGEMENT, L.P.
[LOGO OMITTED]

<PAGE>


                      BOSTON PARTNERS LARGE CAP VALUE FUND
                                (INVESTOR CLASS)
                                       OF
                               THE RBB FUND, INC.

     Boston  Partners  Large  Cap  Value  Fund  (the  "Fund")  is an  investment
portfolio  of The RBB Fund,  Inc.  ("RBB"),  an open-end  management  investment
company.  The shares of the Investor Class ("Shares") offered by this Prospectus
represent  interests  in the Fund.  The Fund is a  diversified  fund that  seeks
long-term  growth of capital,  with  current  income as a  secondary  objective,
primarily  through  equity  investments,  such as common  stocks and  securities
convertible into common stocks.  It seeks to achieve its objectives by investing
at least 65% of its total assets in a diversified portfolio consisting of equity
securities  of issuers with a market  capitalization  of primarily $1 billion or
greater and identified by Boston Partners Asset Management, L.P. (the "Adviser")
as equity securities that it believes possess value characteristics. The Adviser
examines  various  factors  in  determining  the value  characteristics  of such
issuers,  including, but not limited to, price to book value ratios and price to
earnings ratios. These value  characteristics are examined in the context of the
issuer's operating and financial fundamentals such as return on equity, earnings
growth and cash flow.

     This Prospectus contains  information that a prospective  investor needs to
know before  investing.  Please  keep it for future  reference.  A Statement  of
Additional  Information,  dated  December  29,  1998,  has been  filed  with the
Securities  and Exchange  Commission  and is  incorporated  by reference in this
Prospectus.  It may be obtained  free of charge  from the Fund by calling  (888)
261-4073.  The  Prospectus  and the  Statement  of  Additional  Information  are
available for reference,  along with other related material, on the SEC Internet
Web Site (http://www.sec.gov).

SHARES OF THE FUND ARE NOT DEPOSITS OR  OBLIGATIONS OF OR GUARANTEED OR ENDORSED
BY PNC BANK,  NATIONAL  ASSOCIATION,  PFPC  TRUST COMPANY OR ANY OTHER  BANK AND
SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT  INSURANCE  CORPORATION,
THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY. INVESTMENTS IN SHARES OF THE FUND
INVOLVE INVESTMENT RISKS, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.



- --------------------------------------------------------------------------------
THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THIS
PROSPECTUS.   ANY   REPRESENTATION  TO  THE  CONTRARY  IS  A  CRIMINAL  OFFENSE.
- --------------------------------------------------------------------------------


PROSPECTUS                                                     December 29, 1998

<PAGE>

INTRODUCTION
- --------------------------------------------------------------------------------

     RBB is an open-end  management  investment  company  incorporated under the
laws of the State of  Maryland  currently  operating  or  proposing  to  operate
seventeen separate investment portfolios.  The Shares offered by this Prospectus
represent  interests  in the  Boston  Partners  Large  Cap Value  Fund.  RBB was
incorporated in Maryland on February 29, 1988.

FEE TABLE

     The following  table  illustrates  annual  operating  expenses  incurred by
Investor Shares of the Fund (after fee waivers and expense  reimbursements)  for
the fiscal  period ended August 31, 1998,  as a percentage  of average daily net
assets. An example based on the summary is also shown.

ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)
     Management Fees (after waivers)* ..................................   .49%
     12b-1 Fees (after waivers)* .......................................   .25%
     Other Expenses (after waivers and reimbursements)* ................   .51%
                                                                          ----
   Total Fund Operating Expenses (after waivers and 
        expense reimbursements)* .......................................  1.25%
                                                                          ====

  * In the absence of expense  reimbursements  and fee waivers,  Management Fees
    would be 0.75%, 12b-1 Fees would be 0.25%, Other Expenses would be .74%, and
    Total Fund Operating Expenses would be 1.74%. Management Fees and 12b-1 Fees
    are each based on average daily net assets and are calculated daily and paid
    monthly.

EXAMPLE

     An investor would pay the following  expenses on a $1,000 investment in the
Fund, assuming (1) a 5% annual return and (2) redemption at the end of each time
period:

                                               ONE     THREE     FIVE       TEN
                                              YEAR     YEARS     YEARS     YEARS
                                              ----     -----     -----     -----
     Boston Partners Large Cap Value Fund ... $12       $38       $65      $144
                                           
     The Fee Table is  designed  to  assist an  investor  in  understanding  the
various  costs and expenses  that an investor in the Fund will bear  directly or
indirectly.  (For more complete  descriptions of the various costs and expenses,
see  "Management"  and  "Distribution  of Shares" below.) The Fee Table reflects
expense  reimbursements  and voluntary waivers of Management Fees and 12b-1 Fees
for the Fund.  However,  the  Adviser,  the  Distributor  and the other  service
providers  are under no obligation  with respect to such expense  reimbursements
and waivers and there can be no assurance that any future expense reimbursements
and  waivers of  Management  Fees and 12b-1 Fees will not vary from the  figures
reflected in the Fee Table.

     The Example in the Fee Table assumes that all  dividends and  distributions
are  reinvested  and  that the  amounts  listed  under  "Annual  Fund  Operating
Expenses"  remain  the  same in the  years  shown.  THE  EXAMPLE  SHOULD  NOT BE
CONSIDERED A  REPRESENTATION  OF PAST OR FUTURE EXPENSES AND ACTUAL EXPENSES MAY
BE GREATER OR LESS THAN THOSE SHOWN.

FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------

     The "Financial  Highlights"  presented  below set forth certain  investment
results for shares of the Investor  Class of the Fund for the period January 16,
1997 (date of inception)  through  August 31, 1997 and for the fiscal year ended
August 31, 1998.  The  financial  data  included in this table should be read in
conjunction with the financial  statements and notes thereto and the unqualified
report of PricewaterhouseCoopers LLP ("PricewaterhouseCoopers"), RBB's inde-

                                       2
<PAGE>

pendent  accountant,  which are  incorporated by reference into the Statement of
Additional  Information.  Further  information  about  the  performance  of  the
Investor  Class of the Fund is available in the Annual  Report to  Shareholders.
Both  the  Statement  of  Additional   Information  and  the  Annual  Report  to
Shareholders  may be  obtained  from the Fund  free of  charge  by  calling  the
telephone number on page 1 of the prospectus.

                      BOSTON PARTNERS LARGE CAP VALUE FUND

           (FOR AN INVESTOR SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

<TABLE>
<CAPTION>
                                                                                                    FOR THE PERIOD
                                                                               FOR THE FISCAL      JANUARY 16, 1997*
                                                                                 YEAR ENDED             THROUGH
                                                                               AUGUST 31, 1998      AUGUST 31, 1997
                                                                               ---------------     -----------------
<S>                                                                                 <C>                  <C>   
PER SHARE OPERATING PERFORMANCE**
NET ASSET VALUE, BEGINNING OF PERIOD ..........................................     $12.45               $10.20
                                                                                    ------               ------
Net investment income(1) ......................................................       0.06                 0.02
Net realized and unrealized gain/(loss) on investments(2) .....................      (1.27)                2.23
                                                                                    ------               ------
Net increase/(decrease) in net assets resulting from operations ...............      (1.21)                2.25
                                                                                    ------               ------
DIVIDENDS TO SHAREHOLDERS FROM:
Net investment income .........................................................      (0.06)                  --
Net realized capital gains ....................................................      (0.48)                  --
                                                                                    ------               ------
NET ASSET VALUE, END OF PERIOD ................................................     $10.70               $12.45
                                                                                    ======               ======
Total investment return(3) ....................................................     (10.28)%              22.06%
                                                                                    ======               ======
RATIOS/SUPPLEMENTAL DATA
Net assets, end of period (000's omitted) .....................................     $6,150               $  683
Ratio of expenses to average net assets***(1)(4) ..............................       1.19%                1.11%(5)
Ratio of net investment income to average net assets***(1) ....................       0.68%                 .91%(5)
Portfolio turnover rate**** ...................................................     111.68%               67.16%(6)
<FN>
    *  Commencement of operations.
   **  Calculated  based on shares  outstanding on the first and last day of the
       period,  except dividends and  distributions,  if any, which are based on
       actual shares outstanding on the dates of distributions.
  ***  Annualized.
 ****  Not annualized.
   (1) Reflects waivers and reimbursements.
   (2) The amount shown for a share outstanding  throughout the period is not in
       accord with the change in the aggregate  gains and losses in  investments
       during the period because of the timing of sales and  repurchases of Fund
       shares in relation to  fluctuating  net asset value during the respective
       periods.
   (3) Total return is calculated assuming a purchase of shares on the first day
       and a sale of  shares  on the last day of the  period  reported  and will
       include  reinvestments  of dividends  and  distributions,  if any.  Total
       return is not annualized.
   (4) Without the waiver of advisory, 12b-1,  administration and transfer agent
       fees and without the  reimbursement of certain  operating  expenses,  the
       ratio of expenses to average net assets  annualized  for the period ended
       August 31, 1997 and the year ended  August 31, 1998 would have been 3.05%
       and 1.74%, respectively, for the Investor Class.
   (5) Annualized.
   (6) Not annualized.
</FN>
</TABLE>

                                       3
<PAGE>

INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------

     The Fund's  investment  objective is to provide long-term growth of capital
with  current  income as a  secondary  objective.  The Fund seeks to achieve its
objective  by  investing  at least  65% of its  total  assets  in a  diversified
portfolio consisting  primarily of equity securities,  such as common stocks and
securities   convertible   into  common   stocks,   of  issuers  with  a  market
capitalization  of $1  billion  or  greater  and  identified  by the  Adviser as
possessing value characteristics.

     The   Adviser   examines   various   factors  in   determining   the  value
characteristics  of such  issuers,  including  but not  limited to price to book
value  ratios and price to  earnings  ratios.  These value  characteristics  are
examined in the context of the issuer's  operating  and  financial  fundamentals
such as return on equity, earnings growth and cash flow.

     The Adviser selects  securities for the Fund based on a continuous study of
trends  in  industries  and  companies,  earnings  power  and  growth  and other
investment criteria.  In general, the Fund's investments are broadly diversified
over a number of industries and, as a matter of policy, the Fund will not invest
25% or more of its total assets in any one industry.

     The Fund may invest up to 20% of its total assets in  securities of foreign
issuers.  Investing in securities of foreign issuers involves considerations not
typically  associated  with  investing in securities of companies  organized and
operating in the United States. Foreign securities generally are denominated and
pay dividends or interest in foreign currencies.  The Fund may hold from time to
time various foreign  currencies  pending their investment in foreign securities
or their  conversion into U.S.  dollars.  The value of the assets of the Fund as
measured in U.S.  dollars may therefore be affected  favorably or unfavorably by
changes in exchange  rates.  There may be less  publicly  available  information
concerning  foreign  issuers  than is available  with  respect to U.S.  issuers.
Foreign  securities may not be registered with the U.S.  Securities and Exchange
Commission,  and  generally,  foreign  companies  are  not  subject  to  uniform
accounting,  auditing and financial reporting  requirements  comparable to those
applicable to U.S.  issuers.  See  "Investment  Objective and  Policies--Foreign
Securities" in the Statement of Additional Information.

     The Fund may invest the remainder of its total assets in equity  securities
of issuers with lower capitalizations;  derivative  securities;  debt securities
issued by U.S. banks,  corporations  and other business  organizations  that are
investment grade securities;  and debt securities issued by the U.S.  Government
or government agencies.

     In accordance with the above-mentioned  policies,  the Fund may also invest
in indexed securities,  convertible securities,  repurchase agreements,  reverse
repurchase  agreements,  dollar rolls,  financial futures contracts,  options on
futures contracts and may lend portfolio  securities.  See "Investment Objective
and Policies" in the Statement of Additional Information.

     The Fund may invest in registered investment companies and investment funds
in foreign countries subject to the provisions of the Investment  Company Act of
1940, as amended (the "1940 Act") and as discussed in "Investment  Objective and
Policies" in the  Statement of  Additional  Information.  If the Fund invests in
such investment  companies,  the Fund will bear its  proportionate  share of the
costs incurred by such companies, including investment advisory fees.

     While the Adviser intends to fully invest the Fund's assets at all times in
accordance  with the  above-mentioned  policies,  the Fund reserves the right to
hold up to 100% of its assets,  as a temporary  defensive  measure,  in cash and
eligible  U.S.  dollar-denominated  money market  instruments.  The Adviser will
determine when market conditions warrant temporary defensive measures.

     The Fund's  investment  objective and the policies  described  above may be
changed by RBB's Board of Directors  without the affirmative vote of the holders
of a majority of the outstanding Shares representing interests in the Fund.

                                       4
<PAGE>

INVESTMENT LIMITATIONS
- --------------------------------------------------------------------------------

     The  Fund may not  change  the  following  investment  limitations  without
shareholder approval. (A complete list of the investment limitations that cannot
be changed without such a vote of the shareholders is contained in the Statement
of Additional Information under "Investment Objective and Policies.")

     The Fund may not:

         1.  Purchase the  securities of any one issuer,  other than  securities
     issued  or   guaranteed   by  the  U.S.   Government  or  its  agencies  or
     instrumentalities,  if immediately after and as a result of such purchases,
     more than 5% of the value of the Fund's  total  assets would be invested in
     the securities of such issuer,  or more than 10% of the outstanding  voting
     securities of such issuer would be owned by the Fund, except that up to 25%
     of the value of the Fund's total assets may be invested  without  regard to
     such limitations.

         2. Purchase any securities  which would cause, at the time of purchase,
     25% or more of the value of the total  assets of the Fund to be invested in
     the obligations of issuers in any single  industry,  provided that there is
     no limitation with respect to investments in U.S. Government obligations.

         3. Borrow  money or issue senior  securities,  except that the Fund may
     borrow from banks and enter into reverse  repurchase  agreements and dollar
     rolls for temporary purposes in amounts up to one-third of the value of its
     total  assets  at the  time of  such  borrowing;  or  mortgage,  pledge  or
     hypothecate  any assets,  except in connection  with any such borrowing and
     then in amounts not in excess of one-third of the value of the Fund's total
     assets at the time of such borrowing. The Fund will not purchase securities
     while its aggregate  borrowings  (including reverse repurchase  agreements,
     dollar  rolls and  borrowings  from banks) are in excess of 5% of its total
     assets.  Securities held in escrow or separate  accounts in connection with
     the Fund's  investment  practices  are not  considered  to be borrowings or
     deemed to be pledged for purposes of this limitation.

     If a percentage  restriction under one of the Fund's investment policies or
restrictions  or the use of assets is  adhered to at the time a  transaction  is
effected, later changes in percentage resulting from changing values will not be
considered a violation  (except with respect to any restrictions  that may apply
to borrowings or senior securities issued by the Fund).

RISK FACTORS
- --------------------------------------------------------------------------------

     As with other mutual  funds,  there can be no assurance  that the Fund will
achieve  its  objective.  The net asset  value per share of Shares  representing
interests in the Fund will  fluctuate as the values of its portfolio  securities
change in response to changing conditions in the equity market. An investment in
the Fund is not intended to constitute a balanced investment program. Other risk
factors are discussed above under "Investment Objective and Policies" and in the
Statement of Additional Information under "Investment Objective and Polices."

EUROPEAN CURRENCY UNIFICATION

     Many European countries are about to adopt a single European currency,  the
euro.  On January 1, 1999,  the euro will become legal tender for all  countries
participating in the Economic and Monetary Union ("EMU"). A new European Central
Bank will be created to manage the monetary policy of the new unified region. On
the same date,  the exchange  rates will be  irrevocably  fixed  between the EMU
member countries.  National currencies will continue to circulate until they are
replaced by euro coins and bank notes by the middle of 2002.

     This change is likely to significantly  impact the European capital markets
in which the Fund may invest and may result in the Fund facing  additional risks
in pursuing its investment  objective.  These risks, which include,  but are not
limited  to,  uncertainty  as to  the  proper  tax  treatment  of  the  currency
conversion, volatility of currency exchange rates

                                       5
<PAGE>

as a result  of the  conversion,  uncertainty  as to  capital  market  reaction,
conversion costs that may affect issuer profitability and creditworthiness,  and
lack of participation by some European countries, may increase the volatility of
the Fund's net asset value per share.

YEAR 2000
- --------------------------------------------------------------------------------

     Like  other  mutual  funds,   financial  and  business   organizations  and
individuals  around  the  world,  the Fund could be  adversely  affected  if the
computer systems used by the Adviser and the Fund's other service providers,  or
persons with whom they deal, do not properly process and calculate  date-related
information  and data  from and after  January  1,  2000.  This  possibility  is
commonly known as the "Year 2000 Problem." The Year 2000 Problem could also hurt
companies whose securities the Fund holds or securities markets  generally.  The
Fund has been advised by the Adviser,  the Administrators and the Custodian that
they are actively  taking steps to address the Year 2000 Problem with respect to
the computer  systems  that they use and to obtain  assurances  that  comparable
steps are being taken by the Fund's other major service  providers.  While there
can be no  assurance  that  the  Fund's  service  providers  will be  Year  2000
compliant,  the Fund's service providers expect that their plans to be compliant
will be achieved.

ASSET ALLOCATION

     From time to time, the Fund may experience  relatively  large  purchases or
redemptions  due to asset  allocation  decisions made by the Advisor for clients
receiving Asset Allocation account management services involving  investments in
the Fund.  These  transactions  may have a  material  effect on the Fund,  since
redemptions  caused by  reallocations  may result in the Fund selling  portfolio
securities,  and  purchases  caused  by  reallocations  may  result  in the Fund
receiving additional cash that it will have to invest. While it is impossible to
predict  the  overall  impact of these  transactions  over time,  there could be
adverse  effects  on  portfolio  mangement  to the  extent  that the Fund may be
required  to sell  securities  at times  when it would not  otherwise  do so, or
receive  cash  that  cannot  be  invested  in  an  expeditious   manner.   These
transactions  could also have tax consequences if the sale of securities results
in gains and could also increase  transaction costs. The Advisor is committed to
minimizing  the  impact  of such  transactions  on the Fund to the  extent it is
consistent  with  pursuing the  investment  objectives  of clients for which the
Advisor  provides  Asset  Allocation  account   management   services  involving
investments in the Fund and monitors the impact of asset allocation decisions on
the Fund.

GENERAL

     Investment  methods  described in this Prospectus are among those which the
Fund has the power to utilize.  Some may be employed on a regular basis;  others
may not be used at all.  Accordingly,  reference  to any  particular  method  or
technique  carries no implication that it will be utilized or, if it is, that it
will be successful.

MANAGEMENT
- --------------------------------------------------------------------------------

BOARD OF DIRECTORS

     The  business  and  affairs  of RBB and the  Fund  are  managed  under  the
direction of RBB's Board of Directors.

INVESTMENT ADVISER

     Boston Partners Asset  Management,  L.P.  located at 28 State Street,  21st
Floor, Boston,  Massachusetts 02109 serves as the Fund's investment adviser. The
Adviser  provides  investment  management  and investment  advisory  services to
investment  companies and other institutional  accounts that had aggregate total
assets under management as of October 31, 1998, in excess of $16.0 billion.  The
adviser  is  organized  as a Delaware  limited  partnership  whose sole  general
partner is Boston Partners, Inc., a Delaware corporation.

                                       6
<PAGE>

     Subject to the supervision  and direction of RBB's Board of Directors,  the
Adviser manages the Fund's  portfolio in accordance  with the Fund's  investment
objective and policies,  makes investment  decisions for the Fund, places orders
to purchase and sell securities, and employs professional portfolio managers and
securities  analysts who provide research services to the Fund. For its services
to the Fund,  the Adviser is entitled to receive under the Advisory  Agreement a
monthly  advisory fee computed at an annual rate of 0.75% of the Fund's  average
daily net assets. The Adviser intends to limit mutual fund operation expenses to
1.25% of the Fund's average daily net assets.

PORTFOLIO MANAGEMENT

     The day-to-day  portfolio  management of the Fund is the  responsibility of
Mark E.  Donovan  and Wayne S. Sharp who are senior  portfolio  managers  of the
Adviser.  Mr. Donovan is Chairperson of the Adviser's Equity Strategy  Committee
which oversees the investment  activities of the Adviser's $5.5 billion of Large
Cap Value  institutional  equity assets under  management.  Prior to joining the
Adviser on April 16,  1995,  Mr.  Donovan was a Senior Vice  President  and Vice
Chairman of The Boston Company Asset Management, Inc.'s Equity Policy Committee.
Mr.  Donovan is a  Chartered  Financial  Analyst and has over  fifteen  years of
investment  experience.  Ms. Sharp is Vice  Chairperson of the Adviser's  Equity
Strategy Committee and has over twenty-one years of investment experience. Prior
to joining the Adviser on April 16, 1995,  Ms. Sharp was a Senior Vice President
and  member  of  the  Equity  Policy  Committee  of  The  Boston  Company  Asset
Management, Inc. Ms. Sharp is also a Chartered Financial Analyst.

ADMINISTRATOR

     PFPC  Inc.  ("PFPC")  serves  as  administrator  to the Fund and  generally
assists the Fund in all aspects of its administration and operations,  including
matters relating to the maintenance of financial records and accounting. For its
services,  PFPC is  entitled  to  receive  a fee  under  an  administration  and
accounting  services  agreement  calculated  at an  annual  rate of .125% of the
Fund's average daily net assets with a minimum fee of $75,000 payable monthly on
a pro rata basis.

TRANSFER AGENT, DIVIDEND DISBURSING AGENT, AND CUSTODIAN

     PFPC Trust Company, an indirect wholly-owned  subsidiary of PNC Bank Corp.,
will succeed PNC Bank, National Association ("PNC Bank") as the Fund's custodian
pursuant to an assignment. PNC Bank will continue to provide certain services to
PFPC Trust  Company.  PFPC  serves as the  Fund's  transfer  agent and  dividend
disbursing  agent.  The  principal  offices of PFPC are located at 400  Bellevue
Parkway,  Wilmington,  Delaware 19809. PFPC may enter into shareholder servicing
agreements  with  registered   broker-dealers   who  have  entered  into  dealer
agreements  with the  Distributor  ("Authorized  Dealers")  for the provision of
certain shareholder support services to customers of such Authorized Dealers who
are shareholders of the Fund. The services  provided and the fees payable by the
Fund for these services are described in the Statement of Additional Information
under "Investment Advisory, Distribution and Servicing Arrangements."

DISTRIBUTOR

     Provident Distributors,  Inc. ("PDI"), with offices at Four Falls Corporate
Center,  West  Conshohocken,  Pennsylvania  19428,  acts as distributor  for the
Shares pursuant to a distribution agreement (the "Distribution  Agreement") with
RBB on behalf of the Shares.

EXPENSES

     The  expenses  of the  Fund  are  deducted  from its  total  income  before
dividends  are  paid.  Any  general   expenses  of  RBB  that  are  not  readily
identifiable  as belonging to a particular  investment  portfolio of RBB will be
allocated  among all  investment  portfolios  of RBB based upon the relative net
assets of the investment portfolios. The Investor Class of the Fund pays its own
distribution  fees, and may pay a different  share than the other classes of the
Fund of other expenses

                                       7
<PAGE>

(excluding  advisory and custodial fees) if those expenses are actually incurred
in a  different  amount  by  the  Investor  Class  or if it  receives  different
services.

     The  Adviser  may  assume  expenses  of the Fund from time to time.  To the
extent any service  providers  assume  expenses of the Fund,  such assumption of
expenses will have the effect of lowering the Fund's  overall  expense ratio and
increasing its yield to investors.

DISTRIBUTION OF SHARES
- --------------------------------------------------------------------------------

     The Board of  Directors  of RBB has  approved  and  adopted a  Distribution
Agreement and Plan of Distribution  for the Shares (the "Plan") pursuant to Rule
12b-1 under the 1940 Act. Under the Plan, the Distributor is entitled to receive
from the Fund a  distribution  fee with respect to the Shares,  which is accrued
daily and paid  monthly,  of up to 0.25% on an  annualized  basis of the average
daily net assets of the Shares. The actual amount of such compensation under the
Plan is agreed upon by RBB's Board of Directors  and by the  Distributor  in the
Distribution  Agreement.  The Distributor  may, in its discretion,  from time to
time waive voluntarily all or any Portion of its distribution fee.

     Amounts  paid  to  the  Distributor  under  the  Plan  may be  used  by the
Distributor  to cover  expenses  that are related to (i) the sale of the Shares,
(ii) ongoing servicing and/or  maintenance of the accounts of Shareholders,  and
(iii)  sub-transfer  agency services,  subaccounting  services or administrative
services  related to the sale of the Shares,  all as set forth in the Plan.  The
Distributor may delegate some or all of these  functions to Service Agents.  See
"How to Purchase Shares--Purchases Through Intermediaries."

     The Plan obligates the Fund,  during the period it is in effect,  to accrue
and pay to the  Distributor  on behalf of the Shares the fee agreed to under the
Distribution Plan.  Payments under the Plan are not tied exclusively to expenses
actually  incurred by the  Distributor,  and  payments  may exceed  distribution
expenses actually incurred.

PURCHASES THROUGH INTERMEDIARIES

     Shares  of the Fund  may be  available  through  certain  brokerage  firms,
financial  institutions and programs  sponsored by other industry  professionals
(collectively, "Service Organizations"). Certain features of the Shares, such as
the initial and subsequent investment minimums and certain trading restrictions,
may be modified or waived by Service  Organizations.  Service  Organizations may
impose transaction or administrative charges or other direct fees, which charges
or fees would not be imposed if Shares  are  purchased  directly  from the Fund.
Therefore,  a client or customer should contact the Service  Organization acting
on his behalf concerning the fees (if any) charged in connection with a purchase
or  redemption  of Shares and should read this  Prospectus in light of the terms
governing his accounts with the Service Organization. Service Organizations will
be  responsible  for  promptly  transmitting  client or  customer  purchase  and
redemption  orders to the Fund in accordance with their  agreements with clients
or customers. Service Organizations or, if applicable, their designees that have
entered into agreements with the Fund or its agent may enter confirmed  purchase
orders on behalf of clients and customers,  with payment to follow no later than
the Fund's pricing on the following  Business Day. If payment is not received by
such time, the Service  Organization  could be held liable for resulting fees or
losses.  The Fund will be deemed to have received a purchase or redemption order
when a Service Organization, or, if applicable, its authorized designee, accepts
a purchase or  redemption  order in good order.  Orders  received by the Fund in
good order will be priced at the Fund's net asset value next computed after they
are accepted by the Service Organization or its authorized designee.

     For administration,  subaccounting,  transfer agency and/or other services,
the Adviser or the Distributor or their affiliates may pay Service Organizations
and  certain  recordkeeping  organizations  with  whom they  have  entered  into
agreements a fee of up to .35% (the "Service  Fee") of the average  annual value
of  accounts  with  the  Fund  maintained  by  such  Service   Organizations  or
recordkeepers.  The  Service  Fee  payable to any one  Service  Organization  or
recordkeeper is determined based upon a number of factors,  including the nature
and quality of the services provided, the

                                       8
<PAGE>

operations processing  requirements of the relationship and the standardized fee
schedule of the Service Organization or recordkeeper.

     The Adviser,  the  Distributor or either of their  affiliates may, at their
own expense, provide promotional incentives for qualified recipients who support
the sale of Shares  consisting  of securities  dealers who have sold Shares,  or
others,  including  banks  and  other  financial  institutions,   under  special
arrangements.  Incentives may include opportunities to attend business meetings,
conferences, sales or training programs for recipients, employees or clients and
other  programs or events and may also include  opportunities  to participate in
advertising  or  sales  campaigns  and/or  shareholder   services  and  programs
regarding one or more Boston Partners Funds.  Travel, meals and lodging may also
be paid in connection  with these  promotional  activities.  In some  instances,
these   incentives   may  be  offered   only  to  certain   institutions   whose
representatives provide services in connection with the sale or expected sale of
significant amounts of Shares.

HOW TO PURCHASE SHARES
- --------------------------------------------------------------------------------

GENERAL

     Shares representing interests in the Fund are offered continuously for sale
by the  Distributor and may be purchased  without  imposition of a sales charge.
Shares may be purchased initially by completing the application included in this
Prospectus and forwarding the application to the Fund's  transfer  agent,  PFPC.
Purchases  of Shares may be  effected by wire to an account to be  specified  by
PFPC or by mailing a check or  Federal  Reserve  Draft,  payable to the order of
"The  Boston  Partners  Large Cap Value  Fund,"  c/o PFPC Inc.,  P.O.  Box 8852,
Wilmington, Delaware 19899-8852. The name of the Fund, Boston Partners Large Cap
Value Fund, must also appear on the check or Federal Reserve Draft. Shareholders
may not purchase shares of the Boston Partners Large Cap Value Fund with a check
issued by a third party and endorsed over to the Fund.  Federal  Reserve  Drafts
are  available  at  national  banks or any state  bank  which is a member of the
Federal Reserve System.  Initial investments in the Fund must be at least $2,500
and subsequent investments must be at least $100. The Fund reserves the right to
suspend the  offering  of Shares for a period of time or to reject any  purchase
order.

     Shares may be purchased on any  Business  Day. A "Business  Day" is any day
that the New York  Stock  Exchange,  Inc.  (the  "NYSE")  is open for  business.
Currently,  the NYSE is closed on weekends and New Year's Day, Dr. Martin Luther
King, Jr. Day,  Presidents' Day, Good Friday,  Memorial Day,  Independence  Day,
Labor Day,  Thanksgiving  Day and Christmas  Day and on the preceding  Friday or
subsequent Monday when one of these holidays falls on a Saturday or Sunday.

     The price paid for Shares  purchased  is based on the net asset  value next
computed  after a purchase  order is  received  in good order by the Fund or its
agents. Orders received by the Fund or its agents prior to the close of the NYSE
(generally  4:00 p.m.  Eastern Time) are priced at that Business Day's net asset
value. Orders received by the Fund or its agents after the close of the NYSE are
priced at the net asset value next determined on the following  Business Day. In
those cases where an investor  pays for Shares by check,  the  purchase  will be
effected  at the net asset  value next  determined  after the Fund or its agents
receives the order and the completed application.

     Provided  that the  investment  is at least  $2,500,  an investor  may also
purchase  Shares by having his bank or her broker wire Federal Funds to PFPC. An
investor's  bank or broker may impose a charge for this  service.  The Fund does
not currently impose a service charge for effecting wire transfers, but reserves
the  right to do so in the  future.  In order to  ensure  prompt  receipt  of an
investor's Federal Funds wire for an initial investment, it is important that an
investor follows these steps:

     A. Telephone the Fund's transfer agent, PFPC, toll-free (888) 261-4073, and
     provide PFPC with your name, address,  telephone number, Social Security or
     Tax Identification  Number, the Fund selected,  the amount being wired, and
     by

                                       9
<PAGE>

     which bank.  PFPC will then provide an investor with a Fund account number.
     Investors  with existing  accounts  should also notify PFPC prior to wiring
     funds.

     B. Instruct your bank or broker to wire the specified amount, together with
     your assigned account number, to PFPC's account with PNC Bank:

                  PNC Bank, N.A.
                  Philadelphia, PA 19103
                  ABA NUMBER: 0310-0005-3
                  CREDITING ACCOUNT NUMBER: 86-1108-2507
                  FROM: (name of investor)
                  ACCOUNT NUMBER: (Investor's account number with the Fund)
                  FOR PURCHASE OF: Boston Partners Large Cap Value Fund
                  AMOUNT: (amount to be invested)

     C. Fully complete and sign the application and mail it to the address shown
     thereon.  PFPC  will not  process  redemptions  until it  receives  a fully
     completed and signed application.

     For subsequent investments, an investor should follow steps A and B above.

AUTOMATIC INVESTING

     Additional  investments in Shares may be made  automatically by authorizing
the Fund's  transfer agent to withdraw  funds from your bank account.  Investors
desiring to participate in the Automatic  Investment Plan should call the Fund's
transfer agent, PFPC, at (888) 261-4073 to obtain the appropriate forms.

RETIREMENT PLANS

     Shares may be purchased in conjunction with individual  retirement accounts
("IRAs")  and rollover  IRAs where PFPC Trust  Company  acts as  Custodian.  For
further  information as to applications  and annual fees,  contact PFPC at (888)
261-4073.  To  determine  whether the  benefits of an IRA are  available  and/or
appropriate, a shareholder should consult with a tax adviser.

HOW TO REDEEM AND EXCHANGE SHARES
- --------------------------------------------------------------------------------

REDEMPTION BY MAIL

     Shareholders may redeem for cash some or all of their Shares of the Fund at
any time.  To do so, a written  request in proper form must be sent  directly to
Boston Partners Large Cap Value Fund, c/o PFPC Inc., P.O. Box 8852,  Wilmington,
Delaware 19899-8852. There is no charge for a redemption.

     A request for  redemption  must be signed by all persons in whose names the
Shares  are   registered.   Signatures  must  conform  exactly  to  the  account
registration.  If the proceeds of the redemption would exceed $10,000, or if the
proceeds are not to be paid to the record owner at the record address, or if the
shareholder is a corporation, partnership, trust or fiduciary, signature(s) must
be guaranteed  according to the procedures  described below under "How to Redeem
and Exchange Shares -- Exchange Privilege."

     Generally,  a properly signed written  request with any required  signature
guarantee  is all that is required  for a  redemption.  In some cases,  however,
other  documents may be  necessary.  In the case of  shareholders  holding share
certificates,  the certificates for the shares being redeemed must accompany the
redemption  request.  Additional  documentary  evidence  of  authority  is  also
required by the Fund's transfer agent in the event  redemption is requested by a
corporation, partnership, trust, fiduciary, executor or administrator.

                                       10
<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>
<TABLE>
<CAPTION>
BOSTON PARTNERS LARGE CAP VALUE FUND                          bp
        (INVESTOR CLASS)                                      BOSTON PARTNERS ASSET MANAGEMENT, L.P.
                                                              --------------------------------------

<S>                        <C>
ACCOUNT APPLICATION
PLEASE NOTE:  Do not use this form to open a retirement plan account.  For an IRA application or help with this Application, please
call 1-888-261-4073.
                           (Please check the appropriate box(es) below.)
1.
Account
Registration:
                           |_|  Individual           |_|  Joint Tenant          |_|  Other

                           ---------------------------------------------------------------------------------------------------------
                           Name                                                  SOCIAL SECURITY NUMBER OR TAX ID # OF PRIMARY OWNER

                           ---------------------------------------------------------------------------------------------------------
                           NAME OF JOINT OWNER                                        JOINT OWNER SOCIAL SECURITY NUMBER OR TAX ID #

                           For joint accounts, the account registrants will be joint tenants with right of survivorship and not 
                           tenants in common unless tenants in common or community property registrations are requested.

- --------------
GIFT TO MINOR:             |_|  Uniform Gifts/Transfer to Minor's Act
- --------------             
                           ---------------------------------------------------------------------------------------------------------
                           NAME OF ADULT CUSTODIAN (ONLY ONE PERMITTED)

                           ---------------------------------------------------------------------------------------------------------
                           NAME OF MINOR (ONLY ONE PERMITTED)

                           ---------------------------------------------------------------------------------------------------------
                           MINOR'S SOCIAL SECURITY NUMBER AND DATE OF BIRTH

- -------------
CORPORATION,
PARTNERSHIP, TRUST
OR OTHER ENTITY:
- -------------
                           ---------------------------------------------------------------------------------------------------------
                           NAME OF CORPORATION, PARTNERSHIP, OR OTHER                                          NAME(S) OF TRUSTEE(S)

                           ---------------------------------------------------------------------------------------------------------
                           TAXPAYER IDENTIFICATION NUMBER
2.
Mailing
Address:                   ---------------------------------------------------------------------------------------------------------
                           STREET OR P.O. BOX AND/OR APARTMENT NUMBER                                                               
                            
                           ---------------------------------------------------------------------------------------------------------
                           CITY                                                 STATE                                 ZIP CODE

                           ---------------------------------------------------------------------------------------------------------
                           DAY PHONE NUMBER                                                                     EVENING PHONE NUMBER


3.
Investment
Information:
                           Minimum initial investment of $2,500                          Amount of investment $____________

                           Make the check payable to Boston Partners Large Cap Value Fund.

                           Shareholders may not purchase shares of this Fund with a check issued by a third party and endorsed 
                           over to the Fund.


- -------------
DISTRIBUTION               NOTE:  Dividends and capital gains may be reinvested or paid by check.  If not options are selected
OPTIONS:                   below, both dividends and capital gains will be reinvested in additional Fund shares.
- -------------

                           DIVIDENDS |_|   Pay by check |_|   Reinvest |_|   CAPITAL GAINS |_|   Pay by check |_|   Reinvest   |_|


- -------------
SYSTEMATIC                 To select this portion please fill out the information below:
WITHDRAWAL
PLAN:                      Amount__________________________________________      Startup Month ____________________________________
- -------------
<PAGE>

                           -  A minimum amount value of $10,000 in a single account is required to establish a Systematic 
                              Withdrawal Plan.
                           -  Payments will be made on or near the 25th of the month.
                           Please check one of the following options:        _______ Please mail checks to Address of Record 
                                                                                     (Named in Section 2)
                                                                             _______ Please electronically credit my Bank of Record
                                                                                     (Named in Section 5)
4.
Telephone
Redemption:
                           To use this option, you must initial the appropriate line below.
                           I authorize the Transfer Agent to accept instructions from any persons to redeem or exchange shares in 
                           my account(s) by telephone in accordance with the procedures and conditions set forth in the Fund's 
                           current prospectus.

                           ________________________                 ____________________  Redeem shares, and send the proceeds to
                              individual initial                         joint initial    the address of record.


                           ________________________                 ____________________  Exchange shares for shares of The Boston
                              individual initial                         joint initial    Partners Mid Cap Value Fund, Bond Fund,
                                                                                          Micro Cap Value Fund, Market Neutral Fund.


5.
Automatic                  The Account Investment Plan which is available to shareholders of the Fund, makes possible regularly     
Investment                 scheduled purchases of Fund shares to allow dollar-cost averaging. The Fund's Transfer Agent can         
Plan:                      arrange for an amount of money selected by you to be deducted from your checking account and used to     
                           purchase shares of the Fund.     
                              
                           Please debit $________ from my checking account (named below on or about the 20th of the month. PLEASE
                           ATTACH AN UNSIGNED, VOIDED CHECK.

                           |_|  Monthly     |_|  Every Alternate Month |_|  Quarterly   |_|  Other


- -------------              ---------------------------------------------------------------------------------------------------------
BANK OF RECORD:            BANK NAME                                                                    STREET ADDRESS OR P.O. BOX
- -------------
                           ---------------------------------------------------------------------------------------------------------
                           CITY                                        STATE                                       ZIP CODE

                           ---------------------------------------------------------------------------------------------------------
                           BANK ABA NUMBER                                                                   BANK ACCOUNT NUMBER

6.
Signatures

                           The undersigned warrants that I (we) have full authority and, if a natural person, I (we) am (are)
                           of legal age to purchase shares pursuant to this Account Application, and I (we) have received a
                           current prospectus for the Fund in which I (we) am (are) investing. 
                           Under the Interest and Dividend Tax Compliance Act of 1983, the Fund is required to have the following
                           certification: Under penalties of perjury, I certify that:
                           (1) The number shown on this form is my correct taxpayer identification number (or I am waiting for a
                           number to be issued to), and 
                           (2) I am not subject to backup withholding because (a) I am exempt from backup withholding, or (b) I have
                           not been notified by the Internal Revenue Service that I am subject to 31% backup withholding as a result
                           of a failure to report all interest or dividends, or (c) the IRS has notified me that I am no longer 
                           subject to backup withholding.

                           NOTE: YOU MUST CROSS OUT ITEM (2) ABOVE IF YOU HAVE BEEN NOTIFIED BY THE IRS THAT YOU ARE CURRENTLY
                           SUBJECT TO BACKUP WITHHOLDING BECAUSE YOU HAVE FAILED TO REPORT ALL INTEREST AND DIVIDENDS ON YOUR TAX
                           RETURN. THE INTERNAL REVENUE SERVICE DOES NOT REQUIRE YOUR CONSENT TO ANY PROVISION OF THIS DOCUMENT
                           OTHER THAN THE CERTIFICATION REQUIRED TO AUDIT BACKUP WITHHOLDING.


                           ---------------------------------------------------------------------------------------------------------
                           SIGNATURE OF APPLICANT                                                           DATE


                           ---------------------------------------------------------------------------------------------------------
                           PRINT NAME                                                                 TITLE (IF APPLICABLE)


                           ---------------------------------------------------------------------------------------------------------
                           SIGNATURE OF JOINT OWNER                                                         DATE


                           ---------------------------------------------------------------------------------------------------------
                           PRINT NAME                                                                 TITLE (IF APPLICABLE)

                           (If you are signing for a corporation, you must indicate corporate office or title. If you wish
                           additional signatories on the account, please include a corporate resolution. If signing as a fiduciary,
                           you must indicate capacity.)

                           For information on additional options, such as IRA Applications, rollover requests for qualified
                           retirement plans, or for wire instructions, please call us at 1-888-261-4073.

                           MAIL COMPLETED ACCOUNT APPLICATION AND CHECK TO:     THE BOSTON PARTNERS LARGE CAP VALUE FUND
                                                                                C/O PFPC INC.
                                                                                P.O. BOX 8852
                                                                                WILMINGTON, DE  19899-8852
</TABLE>

<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>


SYSTEMATIC WITHDRAWAL PLAN

     If your  account  has a value  of at least  $10,000,  you may  establish  a
Systematic  Withdrawal Plan and receive regular periodic payments.  A request to
establish a Systematic  Withdrawal  Plan must be submitted in writing to PFPC at
P.O. Box 8852, Wilmington,  Delaware 19899-8852. Each withdrawal redemption will
be  processed  on or about the 25th of the month and mailed as soon as  possible
thereafter.  There are no service  charges for  maintenance,  the minimum amount
that you may withdraw  each period is $100.  (This is merely the minimum  amount
allowed and should not be mistaken  for a  recommended  amount.) The holder of a
Systematic  Withdrawal Plan will have any income dividends and any capital gains
distributions  reinvested in full and fractional  shares at net asset value.  To
provide  funds  for  payment,  Shares  will be  redeemed  in such  amount  as is
necessary  at the  redemption  price,  which is net asset value next  determined
after the  Fund's  receipt of a  redemption  request.  Redemption  of Shares may
reduce or possibly exhaust the Shares in your account, particularly in the event
of a  market  decline.  As  with  other  redemptions,  a  redemption  to  make a
withdrawal  payment is a sale for federal  income tax  purposes.  Payments  made
pursuant to a Systematic Withdrawal Plan cannot be considered as actual yield or
income since part of such payments may be a return of capital.

     You will ordinarily not be allowed to make  additional  investments of less
than the aggregate  annual  withdrawals  under the  Systematic  Withdrawal  Plan
during the time you have the plan in effect and,  while a Systematic  Withdrawal
Plan is in effect,  you may not make  periodic  investments  under the Automatic
Investment Plan. You will receive a confirmation of each transaction showing the
sources of the payment and the Share and cash  balance  remaining  in your plan.
The plan may be terminated on written  notice by the  shareholder or by the Fund
and will terminate  automatically if all Shares are liquidated or withdrawn from
the account or upon the death or incapacity of the  shareholder.  You may change
the amount and  schedule  of  withdrawal  payments or suspend  such  payments by
giving written notice to the Fund's  transfer agent at least seven Business Days
prior to the end of the month preceding a scheduled payment.

INVOLUNTARY REDEMPTION

     The Fund reserves the right to redeem a  shareholder's  account at any time
the  net  asset  value  of the  account  falls  below  $500 as the  result  of a
redemption or an exchange request. Shareholders will be notified in writing that
the value of their account is less than $500 and will be allowed 30 days to make
additional investments before the redemption is processed.

PAYMENT OF REDEMPTION PROCEEDS

     In all cases,  the  redemption  price is the net asset value per share next
determined  after the request for  redemption  is received in proper form by the
Fund or its agents.  Payment for Shares  redeemed is made by check mailed within
seven days after  acceptance  by the Fund or its agents of the  request  and any
other necessary  documents in proper order. Such payment may be postponed or the
right of redemption  suspended as permitted by the 1940 Act. If the Shares to be
redeemed have been recently  purchased by check,  the Fund's  transfer agent may
delay  mailing  a  redemption  check,  which  may be a period  of up to 15 days,
pending a determination  that the check has cleared.  The Fund has elected to be
governed by Rule 18f-1 under the 1940 Act so that it is  obligated to redeem its
shares  solely in cash up to the lesser of $250,000 or 1% of its net asset value
during any 90-day period for any one shareholder of a portfolio.

EXCHANGE PRIVILEGE

     The exchange  privilege is available to shareholders  residing in any state
in which the Shares  being  acquired  may be legally  sold.  A  shareholder  may
exchange  Shares of the Fund for Investor  Shares of any other  Boston  Partners
Fund of RBB,  subject to the  restrictions  described under "Exchange  Privilege
Limitations" below. Such exchange will be effected at the net asset value of the
exchanged  Fund  and the  net  asset  value  of the  Fund  being  acquired  next
determined after receipt of a request for an exchange by the Fund or its agents.
An exchange of Shares will be treated as a sale for federal income tax purposes.
See  "Taxes." A  shareholder  wishing to make an exchange may do so by sending a
written request to PFPC.

                                       11
<PAGE>


     If the exchanging shareholder does not currently own Investor Shares of the
Boston Partners Fund into which he would like to exchange, a new account will be
established with the same registration, dividend and capital gain options as the
account from which shares are exchanged,  unless otherwise  specified in writing
by the shareholder with all signatures guaranteed.  A signature guarantee may be
obtained from a domestic bank or trust company,  broker, dealer, clearing agency
or savings association who are participants in a medallion program recognized by
the Securities Transfer Association. The three recognized medallion programs are
Securities Transfer Agents Medallion Program (STAMP),  Stock Exchanges Medallion
Program (SEMP) and New York Stock Exchange,  Inc.  Medallion  Signature  Program
(MSP).  Signature  guarantees  that are not part of these  programs  will not be
accepted.  The exchange  privilege may be modified or terminated at any time, or
from time to time, by RBB, upon 60 days' written notice to shareholders.

     If an exchange is to a new account in the acquired  Fund,  the dollar value
of Investor  Shares  acquired must equal or exceed that Fund's minimum for a new
account;  if to an existing account,  the dollar value must equal or exceed that
Fund's  minimum for  subsequent  investments.  If any amount remains in the Fund
from which the  exchange  is being  made,  such  amount  must not drop below the
minimum account value required by the Fund.

EXCHANGE PRIVILEGE LIMITATIONS

     The Fund's exchange privilege is not intended to afford  shareholders a way
to speculate on  short-term  movements in the market.  Accordingly,  in order to
prevent excessive use of the exchange privilege that may potentially disrupt the
management of the Fund and increase transactions costs, the Fund has established
a policy of limiting excessive exchange activity.

     Shareholders are entitled to six (6) exchange redemptions (at least 30 days
apart)  from the Fund  during any  twelve-month  period.  Notwithstanding  these
limitations,  the  Fund  reserves  the  right to  reject  any  purchase  request
(including  purchases by exchange)  that is deemed to be disruptive to efficient
portfolio management.

TELEPHONE TRANSACTIONS

     In order to request an exchange or redemption  by telephone,  a shareholder
must  have  completed  and  returned  an  account  application   containing  the
appropriate telephone election. To add a telephone option to an existing account
that previously did not provide for this option, a Telephone  Authorization Form
must be filed with PFPC. This form is available from PFPC.

     Once this election has been made, the  shareholder  may simply contact PFPC
by telephone to request the exchange or redemption  by calling  (888)  261-4073.
Neither RBB, the Fund, the  Distributor,  the  Administrator  nor any other Fund
agent will be liable for any loss,  liability,  cost or  expense  for  following
RBB's  telephone  transaction   procedures  described  below  or  for  following
instructions  communicated  by  telephone  that they  reasonably  believe  to be
genuine.

     RBB's telephone transaction  procedures include the following measures: (1)
requiring the appropriate  telephone  transaction privilege forms; (2) requiring
the  caller to provide  the names of the  account  owners,  the  account  social
security number and name of the Fund, all of which must match RBB's records; (3)
requiring RBB's service representative to complete a telephone transaction form,
listing  all of the above  caller  identification  information;  (4)  permitting
exchanges only if the two account  registrations  are  identical;  (5) requiring
that  redemption  proceeds be sent only by check to the account owners of record
at the  address of  record,  or by wire only to the owners of record at the bank
account  of  record;  (6)  sending a  written  confirmation  for each  telephone
transaction  to the owners of record at the  address of record  within  five (5)
Business Days of the call; and (7) maintaining  tapes of telephone  transactions
for six months, if the Fund elects to record shareholder telephone transactions.
For  accounts  held of record by  broker-dealers  (other than the  Distributor),
financial  institutions,   securities  dealers,  financial  planners  and  other
industry  professionals,  additional  documentation or information regarding the
scope of a caller's authority is required.  Finally, for telephone  transactions
in accounts held jointly, additional information regarding other account holders
is required. Telephone

                                       12
<PAGE>


transactions  will not be permitted in connection  with IRA or other  retirement
plan accounts or by an attorney-in-fact under a power of attorney.

NET ASSET VALUE
- --------------------------------------------------------------------------------

     The net asset  value for each class of a fund is  calculated  by adding the
value of the proportionate  interest of the class in a fund's  securities,  cash
and other assets,  deducting the actual and accrued liabilities of the class and
dividing the result by the number of  outstanding  shares of the class.  The net
asset value of each class is calculated independently from each other class. The
net asset values are  calculated  as of 4:00 p.m.  Eastern Time on each Business
Day.

     Valuation of securities held by the Fund is as follows:  securities  traded
on a national  securities  exchange or on the NASDAQ  National Market System are
valued at the last reported sale price that day; securities traded on a national
securities exchange or on the NASDAQ National Market System for which there were
no sales on that day and securities traded on other over-the-counter markets for
which market  quotations are readily available are valued at the mean of the bid
and asked prices;  and  securities  for which market  quotations are not readily
available  are valued at fair  market  value as  determined  in good faith by or
under the  direction of RBB's Board of Directors.  The amortized  cost method of
valuation may also be used with respect to debt  obligations  with sixty days or
less remaining to maturity.

     With the approval of RBB's Board of  Directors,  the Fund may use a pricing
service,  bank or broker-dealer  experienced in such matters to value the Fund's
securities. A more detailed discussion of net asset value and security valuation
is contained in the Statement of Additional Information.

DIVIDENDS AND DISTRIBUTIONS
- --------------------------------------------------------------------------------

     The Fund will distribute substantially all of the net investment income and
net realized capital gains, if any, of the Fund to the Fund's shareholders.  All
distributions  are  reinvested  in the form of  additional  full and  fractional
shares unless a shareholder elects otherwise.

     The  Fund  will  declare  and pay  dividends  from  net  investment  income
annually,  and  pays  them in the  calendar  year in which  they  are  declared,
generally in December.  Net realized  capital gains  (including  net  short-term
capital gains), if any, will be distributed at least annually.

TAXES
- --------------------------------------------------------------------------------

     The  following  discussion is only a brief summary of some of the important
tax considerations  generally affecting the Fund and its shareholders and is not
intended as a substitute for careful tax planning. Accordingly, investors in the
Fund should consult their tax advisers with specific  reference to their own tax
situation.

     The Fund will elect to be taxed as a  regulated  investment  company  under
Subchapter M of the Internal  Revenue Code of 1986,  as amended.  So long as the
Fund qualifies for this tax treatment, it will be relieved of federal income tax
on amounts  distributed to  shareholders,  but  shareholders,  unless  otherwise
exempt, will pay income or capital gains taxes on amounts so distributed (except
distributions  that are  treated as a return of capital)  regardless  of whether
such distributions are paid in cash or reinvested in additional shares.

     Distributions  out of the "net capital  gain" (the excess of net  long-term
capital  gain over net  short-term  capital  loss),  if any, of the Fund will be
taxed to shareholders as long-term capital gain regardless of the length of time
a shareholder has held his shares,  whether such gain was reflected in the price
paid for the shares,  or whether  such gain was  attributable  to bonds  bearing
tax-exempt interest.  All other  distributions,  to the extent they are taxable,
are taxed to shareholders as ordinary income.

                                       13
<PAGE>

     RBB will send written  notices to shareholders  annually  regarding the tax
status of distributions made by the Fund.  Dividends declared in December of any
year payable to  shareholders of record on a specified date in such a month will
be deemed to have been  received by the  shareholders  on December 31,  provided
such dividends are paid during  January of the following  year. The Fund intends
to make  sufficient  actual  or  deemed  distributions  prior to the end of each
calendar year to avoid liability for federal excise tax.

     Investors  should be careful to  consider  the tax  implications  of buying
shares just prior to a distribution.  The price of shares purchased at that time
will  reflect  the  amount  of the  forthcoming  distribution.  Those  investors
purchasing shares immediately prior to a distribution will nevertheless be taxed
on the entire amount of the distribution received, although the distribution is,
in effect, a return of capital.

     Shareholders  who exchange  shares  representing  interests in one Fund for
shares  representing  interests in another Fund will generally recognize gain or
loss for federal income tax purposes.

     Shareholders  who are  nonresident  alien  individuals,  foreign  trusts or
estates,  foreign  corporations  or  foreign  partnerships  may  be  subject  to
different U.S. federal income tax treatment.

MULTI-CLASS STRUCTURE
- --------------------------------------------------------------------------------

     The Fund offers one other class of shares,  Institutional Shares, which are
offered directly to institutional investors,  pursuant to separate prospectuses.
Shares of each class  represent  equal pro rata interests in the Fund and accrue
dividends and calculate net asset value and  performance  quotations in the same
manner.  The Fund will quote performance of the Institutional  Shares separately
from Investor Shares. Because of different expenses paid by the Investor Shares,
the total  return on such shares can be expected,  at any time,  to be different
than the total return on  Institutional  Shares.  Information  concerning  these
other classes may be obtained by calling the Fund at (888) 261-4073.

DESCRIPTION OF SHARES
- --------------------------------------------------------------------------------

     RBB has authorized  capital of thirty billion shares of Common Stock, $.001
par value per share,  of which 18.326  billion  shares are currently  classified
into 97 different  classes of Common Stock.  See  "Description of Shares" in the
Statement of Additional Information.

     THIS  PROSPECTUS AND THE STATEMENT OF ADDITIONAL  INFORMATION  INCORPORATED
HEREIN RELATE PRIMARILY TO THE BOSTON PARTNERS LARGE CAP VALUE FUND AND DESCRIBE
ONLY THE  INVESTMENT  OBJECTIVES AND POLICIES,  OPERATIONS,  CONTRACTS AND OTHER
MATTERS RELATING TO THE BOSTON PARTNERS LARGE CAP VALUE FUND.

     Each  share  that   represents  an  interest  in  the  Fund  has  an  equal
proportionate interest in the assets belonging to the Fund with each other share
that  represents  an  interest  in the Fund,  even where a share has a different
class  designation  than  another  share  representing  an interest in the Fund.
Shares of the Fund do not have preemptive or conversion rights.  When issued for
payment  as  described  in this  Prospectus,  Shares  will  be  fully  paid  and
non-assessable.

     RBB  currently  does not intend to hold  annual  meetings  of  shareholders
except  as  required  by the 1940 Act or other  applicable  law.  The law  under
certain circumstances provides shareholders with the right to call for a meeting
of shareholders to consider the removal of one or more directors.  To the extent
required  by law,  the Fund will  assist in  shareholder  communication  in such
matters.

     Holders of Shares of the Fund will vote in the  aggregate  and not by class
on all matters, except where otherwise required by law. Further, shareholders of
all investment portfolios of RBB will vote in the aggregate and not by portfolio
except as otherwise required by law or when RBB's Board of Directors  determines
that the matter to be voted upon

                                       14
<PAGE>


affects  only the  interests  of the  shareholders  of a  particular  investment
portfolio.  (See the  Statement  of  Additional  Information  under  "Additional
Information  Concerning  Fund Shares" for examples of when the 1940 Act requires
voting  by  investment  portfolio  or by  class.)  Shareholders  of the Fund are
entitled  to one  vote  for  each  full  share  held  (irrespective  of class or
portfolio) and fractional  votes for fractional  shares held.  Voting rights are
not cumulative and,  accordingly,  the holders of more than 50% of the aggregate
shares of Common Stock of the Fund may elect all of the directors.

     As of November 16, 1998 to the Fund's  knowledge,  no person held of record
or beneficially 25% or more of the outstanding shares of all classes of RBB.

OTHER INFORMATION
- --------------------------------------------------------------------------------

REPORTS AND INQUIRIES

     Shareholders  will receive  unaudited  semi-annual  reports  describing the
Fund's  investment   operations  and  annual  financial  statements  audited  by
independent accountants. Shareholder inquiries should be addressed to the Fund's
transfer agent,  PFPC, at Bellevue Park Corporate Center,  400 Bellevue Parkway,
Wilmington, Delaware 19809, toll-free (888) 261-4073.

SHARE CERTIFICATES

     In  the  interest  of  economy  and  convenience,   physical   certificates
representing shares in the Fund are not normally issued.

HISTORICAL PERFORMANCE INFORMATION

     For the period from  commencement of operations  (January 16, 1997) through
August 31, 1998,  the total  return since  inception  (not  annualized)  for the
Investor Class of Shares of the Fund was as follows:

Unannualized investment returns for the period ended August 31, 1998
                                                                        Since
                                                                      Inception
                                                                      ---------
     Boston Partners Large Cap Value Fund
         (Investor Shares) .......................................      9.51%


     The total return  assumes the  reinvestment  of all  dividends  and capital
gains and reflects expense  reimbursements and investment advisory fee and 12b-1
fee waivers in effect.  Without these  expense  reimbursements  or waivers,  the
Fund's  performance  would have been lower.  Of course,  past  performance is no
guarantee  of  future  results.  Investment  return  and  principal  value  will
fluctuate,  so that Shares,  when  redeemed,  may be worth more or less than the
original  cost.  For  more   information  on   performance,   see   "Performance
Information" in the Statement of Additional Information.

     The table below  presents the Composite  performance  history of certain of
the  Adviser's  managed  accounts on an  annualized  basis for the period  ended
August 31, 1998.  The  Composite is  comprised  of the  Adviser's  institutional
accounts  and other  privately  managed  accounts  with  investment  objectives,
policies and strategies substantially similar to those of the Fund, although the
accounts  have  longer  operating  histories  than  the  Fund,  which  commenced
operations on January 16, 1997. The Composite  performance  information includes
the reinvestment of dividends received in the underlying securities and reflects
the payment of investment  advisory fees. The privately  managed accounts in the
Composite are only available to the Adviser's  institutional  advisory  clients.
The past  performance  of the funds and accounts which comprise the Composite is
not indicative of or a substitute for the future  performance of the Fund. These
accounts have lower  investment  advisory fees than the Fund,  and the Composite
performance figures would have

                                       15
<PAGE>

been  lower if subject to the higher  fees and  expenses  incurred  by the Fund.
These private accounts are also not subject to the same investment  limitations,
diversification  requirements  and other  restrictions  which are  imposed  upon
mutual  funds  under  the 1940 Act and the  Internal  Revenue  Code,  which,  if
imposed,  may have adversely affected the performance  results of the Composite.
Listed below the  performance  history for the Composite is a comparative  index
comprised  of  securities  similar to those in which  accounts  contained in the
Composite are invested.

     Annualized investment returns for the period ended August 31, 1998

                                                                     Since
                                                 One Year          Inception
                                                 --------          ---------
     Composite Performance ..................... (10.28)%             5.75%
     S&P 500 Stock Index .......................   8.11%             16.30%

* The Adviser commenced managing these accounts on June 1, 1995.

     The S&P 500  Stock  Index  is an  unmanaged  index of 500  selected  common
stocks, most of which are listed on the NYSE.

FUTURE PERFORMANCE INFORMATION

     From  time to time,  the  Fund may  advertise  its  performance,  including
comparisons  to other  mutual funds with similar  investment  objectives  and to
stock or other relevant indices.  All such  advertisements will show the average
annual total return over one, five and ten year periods or, if such periods have
not yet elapsed,  shorter  periods  corresponding  to the life of the Fund. Such
total  return  quotations  will be computed by finding  the  compounded  average
annual total  return for each time period that would equate the assumed  initial
investment of $1,000 to the ending redeemable value, net of fees, according to a
required standardized  calculation.  The standard calculation is required by the
SEC to provide consistency and comparability in investment company  advertising.
The Fund may also from time to time  include in such  advertising  an  aggregate
total return figure or a total return figure that is not calculated according to
the  standardized  formula  in order  to  compare  more  accurately  the  Fund's
performance with other measures of investment  return.  For example,  the Fund's
total return may be compared with data published by Lipper Analytical  Services,
Inc., CDA  Investment  Technologies,  Inc. or  Weisenberger  Investment  Company
Service, or with the performance of the Standard & Poor's 500 Stock Index or the
Dow  Jones  Industrial  Average.   Performance   information  may  also  include
evaluation of the Fund by nationally recognized ranking services and information
as  reported  in  financial   publications  such  as  Business  Week,   Fortune,
Institutional  Investor,  Money  Magazine,  Forbes,  Barron's,  The Wall  Street
Journal, The New York Times, or other national,  regional or local publications.
All advertisements  containing performance data will include a legend disclosing
that such  performance  data represents past performance and that the investment
return and principal value of an investment will fluctuate so that an investor's
Shares, when redeemed, may be worth more or less than their original cost.

                                       16
<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>


NO PERSON HAS BEEN  AUTHORIZED TO GIVE ANY  INFORMATION  OR PROSPECTUS  MAKE ANY
REPRESENTATIONS  NOT  CONTAINED  IN THIS  PROSPECTUS  OR IN RBB'S  STATEMENT  OF
ADDITIONAL INFORMATION  INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE
OFFERING MADE BY THIS  PROSPECTUS  AND, IF GIVEN OR MADE,  SUCH  REPRESENTATIONS
MUST NOT BE RELIED UPON AS HAVING  BEEN  AUTHORIZED  BY RBB OR ITS  DISTRIBUTOR.
THIS  PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY RBB OR BY THE DISTRIBUTOR IN
ANY JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY BE MADE.



                   ------------------------------------------
                                TABLE OF CONTENTS
                                                                            PAGE
                                                                            ----
INTRODUCTION ................................................................  2
FINANCIAL HIGHLIGHTS ........................................................  2
INVESTMENT OBJECTIVES AND POLICIES ..........................................  4
INVESTMENT LIMITATIONS ......................................................  5
RISK FACTORS ................................................................  5
YEAR 2000 ...................................................................  6
MANAGEMENT ..................................................................  6
DISTRIBUTION OF SHARES ......................................................  8
HOW TO PURCHASE SHARES ......................................................  9
HOW TO REDEEM AND EXCHANGE SHARES ........................................... 10
NET ASSET VALUE ............................................................. 13
DIVIDENDS AND DISTRIBUTIONS ................................................. 13
TAXES ....................................................................... 13
MULTI-CLASS STRUCTURE ....................................................... 14
DESCRIPTION OF SHARES ....................................................... 14
OTHER INFORMATION ........................................................... 15

INVESTMENT ADVISER
Boston Partners Asset Management, L.P.
Boston, Massachusetts

CUSTODIAN
PFPC Trust Company
Wilmington, Delaware

TRANSFER AGENT AND ADMINISTRATOR
PFPC Inc.
Wilmington, Delaware

DISTRIBUTOR
Provident Distributors, Inc.
West Conshohocken, Pennsylvania

COUNSEL
Drinker Biddle & Reath LLP
Philadelphia, Pennsylvania

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers LLP
Philadelphia, Pennsylvania

[LOGO OMITTED]

<PAGE>
PROSPECTUS
DECEMBER 29, 1998
                                 BOSTON PARTNERS
                                     MID CAP
                                   VALUE FUND
                             (INSTITUTIONAL SHARES)

bp
BOSTON PARTNERS ASSET MANAGEMENT, L.P.
[LOGO GRAPHIC OMITTED]

<PAGE>

                       BOSTON PARTNERS MID CAP VALUE FUND
                              (INSTITUTIONAL CLASS)
                                       OF
                               THE RBB FUND, INC.

     Boston Partners Mid Cap Value Fund (the "Fund") is an investment  portfolio
of The RBB Fund, Inc. ("RBB"),  an open-end management  investment company.  The
shares  of  the  Institutional  Class  ("Shares")  offered  by  this  Prospectus
represent  interests  in the Fund.  The Fund is a  diversified  fund that  seeks
long-term  growth of capital,  with  current  income as a  secondary  objective,
primarily through equity investments, such as common stocks. It seeks to achieve
its  objectives  by investing at least 65% of its total assets in a  diversified
portfolio   consisting   of  equity   securities   of  issuers   with  a  market
capitalization of primarily between $200 million and $6 billion,  and identified
by Boston Partners Asset  Management,  L.P. (the "Adviser") as equity securities
that it believes  possess value  characteristics.  The Adviser  examines various
factors in determining the value characteristics of such issuers, including, but
not limited to, price to book value ratios and price to earnings  ratios.  These
value  characteristics are examined in the context of the issuer's operating and
financial fundamentals such as return on equity, earnings growth and cash flow.

     This Prospectus contains  information that a prospective  investor needs to
know before  investing.  Please  keep it for future  reference.  A Statement  of
Additional  Information,  dated  December  29,  1998,  has been  filed  with the
Securities  and Exchange  Commission  and is  incorporated  by reference in this
Prospectus.  It may be obtained  free of charge  from the Fund by calling  (888)
261-4073.  The  Prospectus  and the  Statement  of  Additional  Information  are
available for reference, along with other related materials, on the SEC Internet
Web Site (http://www.sec.gov).

SHARES OF THE FUND ARE NOT DEPOSITS OR  OBLIGATIONS OF OR GUARANTEED OR ENDORSED
BY PNC BANK,  NATIONAL  ASSOCIATION,  PFPC  TRUST COMPANY OR ANY OTHER  BANK AND
SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT  INSURANCE  CORPORATION,
THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY. INVESTMENTS IN SHARES OF THE FUND
INVOLVE INVESTMENT RISKS, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.
- --------------------------------------------------------------------------------
THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THIS
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------

PROSPECTUS                                                     December 29, 1998

<PAGE>

EXPENSE TABLE
- --------------------------------------------------------------------------------
     The following  table  illustrates  annual  operating  expenses  incurred by
Institutional Shares of the Fund (after fee waivers and expense  reimbursements)
for the period  ended  August 31, 1998,  as a  percentage  of average  daily net
assets. An example based on the summary is also shown.

ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)

     Management Fees (after waivers)*. .................................    .58%

     12b-1 Fees ........................................................   0.00%

     Other Expenses (after waivers and expense reimbursements)*. .......    .42%
                                                                           ----
   Total Fund Operating Expenses (after waivers and expense 
      reimbursements)* .................................................   1.00%
                                                                           ====

* In the  absence of fee waivers and  expense  reimbursements,  Management  Fees
  would be 0.80%; Other Expenses would be .77% and Total Fund Operating Expenses
  would be 1.57%.  Management Fees are based on average daily net assets and are
  calculated daily and paid monthly.

EXAMPLE

     An investor would pay the following  expenses on a $1,000 investment in the
Fund, assuming (1) a 5% annual return and (2) redemption at the end of each time
period:

                                              ONE      THREE    FIVE        TEN
                                             YEAR      YEARS    YEARS      YEARS
                                             ----      -----    -----      -----
     Boston Partners Mid Cap Value Fund ....  $10       $32      $55        $122

     The Fee Table is  designed  to  assist an  investor  in  understanding  the
various  costs and expenses  that an investor in the Fund will bear  directly or
indirectly.  (For more complete  descriptions of the various costs and expenses,
see  "Management"  below.) The Fee Table  reflects  expense  reimbursements  and
voluntary  waivers of Management Fees and  administrative  services fees for the
Fund,  which are  expected  to be in effect  during  the  current  fiscal  year.
However,  the Adviser,  the  Administrative  Services Agent and the Fund's other
service  providers  are  under  no  obligation  with  respect  to  such  expense
reimbursements and waivers and there can be no assurance that any future expense
reimbursements  and  waivers of  Management  Fees will not vary from the figures
reflected in the Fee Table.

     The Example in the Fee Table assumes that all  dividends and  distributions
are  reinvested  and  that the  amounts  listed  under  "Annual  Fund  Operating
Expenses"  remain  the  same in the  years  shown.  THE  EXAMPLE  SHOULD  NOT BE
CONSIDERED A  REPRESENTATION  OF PAST OR FUTURE EXPENSES AND ACTUAL EXPENSES MAY
BE GREATER OR LESS THAN THOSE SHOWN.

FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
     The "Financial  Highlights"  presented  below set forth certain  investment
results for shares of the Institutional Class of the Fund for the period June 2,
1997 (date of inception)  through  August 31, 1997 and for the fiscal year ended
August 31, 1998.  The  financial  data  included in this table should be read in
conjunction with the financial  statements and notes thereto and the unqualified
report   of   PricewaterhouseCoopers   LLP   ("PricewaterhouseCoopers"),   RBB's
independent  accountant,  which are incorporated by reference into the Statement
of Additional  Information.  Further  information  about the  performance of the
Institutional   Class  of  the  Fund  is  available  in  the  Annual  Report  to
Shareholders. Both the Statement of Additional Information and the Annual Report
to  Shareholders  may be  obtained  from the Fund free of charge by calling  the
telephone number on page 1 of the prospectus.

                                       2
<PAGE>

                       BOSTON PARTNERS MID CAP VALUE FUND
         (FOR AN INSTITUTIONAL SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

<TABLE>
<CAPTION>
                                                                                                    FOR THE PERIOD
                                                                               FOR THE FISCAL        JUNE 2, 1997*
                                                                                 YEAR ENDED             THROUGH
                                                                               AUGUST 31, 1998      AUGUST 31, 1997
                                                                               ---------------      ---------------
<S>                                                                                  <C>                  <C>   
Per Share Operating Performance**
Net asset value, beginning of period ........................................        $11.01               $10.00
                                                                                     ------               ------
Net investment income (1) ...................................................          0.01                  .01
Net realized and unrealized gain/(loss) on investments(2) ...................         (1.39)                1.00
                                                                                     ------               ------
Net increase/(decrease) in net assets resulting
   from operations ..........................................................         (1.38)                1.01
                                                                                     ------               ------
DIVIDEND TO SHAREHOLDERS FROM:
Net investment income .......................................................         (0.01)                  --
Net realized capital gains. .................................................         (0.14)                  --
                                                                                     ------               ------
Net asset value, end of period. .............................................         $9.48               $11.01
                                                                                     ======               ======
Total investment return(3). .................................................        (12.73)%              10.10%
                                                                                     ======               ======
Ratios/Supplemental Data
   Net assets, end of period (000) ..........................................       $67,568               $3,750
   Ratio of expenses to
     average net assets(1)(4) ...............................................          1.00%                1.00%(5)
   Ration of net investment income to
     average net assets(1) ..................................................          0.13%                1.08%(5)
   Portfolio turnover rate ..................................................        167.86%               21.80%(6)

<FN>
   *   Commencement of operations.
  **   Calculated  based on shares  outstanding on the first and last day of the
       period,  except for dividends and distributions,  if any, which are based
       on actual shares outstanding on the dates of distributions.
  (1)  Reflects waivers and reimbursements.
  (2)  The amount shown for a share outstanding  throughout the period is not in
       accord with the change in the aggregate  gains and losses in  investments
       during the period because of the timing of sales and  repurchases of Fund
       shares in relation to  fluctuating  net asset value during the respective
       periods.
  (3)  Total return is calculated assuming a purchase of shares on the first day
       and a sale of  shares  on the last day of the  period  reported  and will
       include  reinvestments  of dividends  and  distributions,  if any.  Total
       return is not annualized.
  (4)  Until May 29, 1998, the Institutional  Class of the Fund paid .03% of its
       average  daily net assets to the  Fund's  previous  Distributor  in 12b-1
       fees. From May 29, 1998 through August 31, 1998, the Institutional  Class
       of  the  Fund  paid  .03%  of  its  average   daily  net  assets  to  the
       Administrative  Services  Agent pursuant to the  Administrative  Services
       Plan for Institutional  Shares, in lieu of 12b-1 fees. Without the waiver
       of advisory, 12b-1, administrative services,  administration and transfer
       agent fees and without the reimbursement of certain  operating  expenses,
       the ratio of  expenses to average  net assets  annualized  for the period
       ended  August 31, 1997 and the year ended August 31, 1998 would have been
       12.37% and 1.57%, respectively, for the Institutional Class.
  (5)  Annualized.
  (6)  Not annualized.
</FN>
</TABLE>

                                       3
<PAGE>

INTRODUCTION
- --------------------------------------------------------------------------------
     RBB is an open-end  management  investment  company  incorporated under the
laws of the State of  Maryland  currently  operating  or  proposing  to  operate
seventeen separate investment portfolios.  The Shares offered by this Prospectus
represent  interest  in  the  Boston  Partners  Mid  Cap  Value  Fund.  RBB  was
incorporated in Maryland on February 29, 1988.

INVESTMENT OBJECTIVES AND POLICIES
- --------------------------------------------------------------------------------
     The Fund's  investment  objective is to provide long-term growth of capital
with  current  income as a  secondary  objective.  The Fund seeks to achieve its
objective by  investing,  under normal  market  conditions,  at least 65% of its
total  assets  in  a  diversified   portfolio  consisting  primarily  of  equity
securities  such as common  stocks of issuers  with a market  capitalization  of
between  $200  million  and $6 billion and  identified  by the Adviser as equity
securities that it believes possess value characteristics.

     The   Adviser   examines   various   factors  in   determining   the  value
characteristics  of such issuers,  including,  but not limited to, price to book
value  ratios and price to  earnings  ratios.  These value  characteristics  are
examined in the context of the issuer's  operating  and  financial  fundamentals
such as return on equity, earnings growth and cash flow.

     The Adviser selects  securities for the Fund based on a continuous study of
trends  in  industries  and  companies,  earning  power  and  growth  and  other
investment criteria.  In general, the Fund's investments are broadly diversified
over a number of industries and, as a matter of policy, the Fund will not invest
25% or more of its total assets in any one industry.

     The Fund may invest up to 20% of its total assets in  securities of foreign
issuers.  Investing in securities of foreign issuers involves considerations not
typically  associated  with  investing in securities of companies  organized and
operating in the United States. Foreign securities generally are denominated and
pay dividends or interest in foreign currencies.  The Fund may hold from time to
time various foreign  currencies  pending their investment in foreign securities
or their  conversion into U.S.  dollars.  The value of the assets of the Fund as
measured in U.S.  dollars may therefore be affected  favorably or unfavorably by
changes in exchange  rates.  There may be less  publicly  available  information
concerning  foreign  issuers  than is available  with  respect to U.S.  issuers.
Foreign  securities may not be registered with the U.S.  Securities and Exchange
Commission,  and  generally,  foreign  companies  are  not  subject  to  uniform
accounting,  auditing and financial reporting  requirements  comparable to those
applicable to U.S.  issuers.  See  "Investment  Objective and  Policies--Foreign
Securities" in the Statement of Additional Information.

     The Fund may invest the remainder of its total assets in equity  securities
of issuers with lower or higher  capitalizations;  derivative  securities;  debt
securities issued by U.S. banks,  corporations and other business  organizations
that are investment  grade  securities;  and debt securities  issued by the U.S.
government or government agencies.

     In accordance with the above-mentioned  policies,  the Fund may also invest
in indexed securities,  repurchase  agreements,  reverse repurchase  agreements,
dollar rolls, financial futures contracts,  options on futures contracts and may
lend  portfolio  securities.  See  "Investment  Objectives  and Policies" in the
Statement of Additional Information.

     The Fund may invest in registered investment companies and investment funds
in foreign countries subject to the provisions of the Investment  Company Act of
1940, as amended (the "1940 Act"),  and as discussed in  "Investment  Objectives
and Policies" in the Statement of Additional Information. If the Fund invests in
such investment  companies,  the Fund will bear its  proportionate  share of the
costs incurred by such companies, including investment advisory fees.

                                       4
<PAGE>

     While the Adviser intends to fully invest the Fund's assets at all times in
accordance  with the  above-mentioned  policies,  the Fund reserves the right to
hold up to 100% of its assets,  as a temporary  defensive  measure,  in cash and
eligible U.S.  dollar-denominated  money market  instruments.  The Adviser would
determine when market conditions warrant temporary defensive measures.

     The Fund's  investment  objectives and the policies  described above may be
changed by RBB's Board of Directors  without the affirmative vote of the holders
of a majority of the outstanding Shares representing interests in the Fund.

INVESTMENT LIMITATIONS
- --------------------------------------------------------------------------------
     The  Fund may not  change  the  following  investment  limitations  without
shareholder approval. (A complete list of the investment limitations that cannot
be changed without such a vote of the shareholders is contained in the Statement
of Additional Information under "Investment Objectives and Policies.")

     The Fund may not:

         1.  Purchase the  securities of any one issuer,  other than  securities
     issued  or   guaranteed   by  the  U.S.   Government  or  its  agencies  or
     instrumentalities,  if  immediately  after and as a result of such purchase
     more than 5% of the value of the Fund's  total  assets would be invested in
     the securities of such issuer,  or more than 10% of the outstanding  voting
     securities of such issuer would be owned by the Fund, except that up to 25%
     of the value of the Fund's total assets may be invested  without  regard to
     such limitations.

         2. Purchase any securities  which would cause, at the time of purchase,
     25% or more of the value of the total  assets of the Fund to be invested in
     the obligations of issuers in any single  industry,  provided that there is
     no limitation with respect to investments in U.S. Government obligations.

         3. Borrow  money or issue senior  securities,  except that the Fund may
     borrow from banks and enter into reverse  repurchase  agreements and dollar
     rolls for temporary purposes in amounts up to one-third of the value of its
     total  assets  at the  time of  such  borrowing;  or  mortgage,  pledge  or
     hypothecate  any assets,  except in connection  with any such borrowing and
     then in amounts not in excess of one-third of the value of the Fund's total
     assets at the time of such borrowing. The Fund will not purchase securities
     while its aggregate  borrowings  (including reverse repurchase  agreements,
     dollar  rolls and  borrowings  from banks) are in excess of 5% of its total
     assets.  Securities held in escrow or separate  accounts in connection with
     the Fund's  investment  practices  are not  considered  to be borrowings or
     deemed to be pledged for purposes of this limitation.

     If a percentage  restriction under one of the Fund's investment policies or
restrictions  or the use of assets is  adhered to at the time a  transaction  is
effected, later changes in percentage resulting from changing values will not be
considered a violation  (except with respect to any restrictions  that may apply
to borrowings or senior securities issued by the Fund).

RISK FACTORS
- --------------------------------------------------------------------------------
     As with other mutual  funds,  there can be no assurance  that the Fund will
achieve its objective.  The net asset value per share of Shares  representing an
interest in the Fund will  fluctuate as the values of its  portfolio  securities
change in response to changing conditions in the equity market. An investment in
the Fund is not intended to constitute a balanced investment program. Other risk
factors are discussed above under "Investment Objective and Policies" and in the
Statement of Additional Information under "Investment Objective and Policies."

                                       5
<PAGE>

EUROPEAN CURRENCY UNIFICATION

     Many European countries are about to adopt a single European currency,  the
euro.  On January 1, 1999,  the euro will become legal tender for all  countries
participating in the Economic and Monetary Union ("EMU"). A new European Central
Bank will be created to manage the monetary policy of the new unified region. On
the same date,  the exchange  rates will be  irrevocably  fixed  between the EMU
member countries.  National currencies will continue to circulate until they are
replaced by euro coins and bank notes by the middle of 2002.

     This change is likely to significantly  impact the European capital markets
in which the Fund may invest and may result in the Fund facing  additional risks
in pursuing its investment  objective.  These risks, which include,  but are not
limited  to,  uncertainty  as to  the  proper  tax  treatment  of  the  currency
conversion, volatility of currency exchange rates as a result of the conversion,
uncertainty  as to capital  market  reaction,  conversion  costs that may affect
issuer  profitability  and  creditworthiness,  and lack of participation by some
European  countries,  may increase the  volatility of the Fund's net asset value
per share.

YEAR 2000
- --------------------------------------------------------------------------------
     Like  other  mutual  funds,   financial  and  business   organizations  and
individuals  around  the  world,  the Fund could be  adversely  affected  if the
computer systems used by the Adviser and the Fund's other service providers,  or
persons with whom they deal, do not properly process and calculate  date-related
information  and data  from and after  January  1,  2000.  This  possibility  is
commonly known as the "Year 2000 Problem." The Year 2000 Problem could also hurt
companies whose securities the Fund holds or securities markets  generally.  The
Fund has been advised by the Adviser,  the Administrators and the Custodian that
they are actively  taking steps to address the Year 2000 Problem with respect to
the computer  systems  that they use and to obtain  assurances  that  comparable
steps are being taken by the Fund's other major service  providers.  While there
can be no  assurance  that  the  Fund's  service  providers  will be  Year  2000
compliant,  the Fund's service providers expect that their plans to be compliant
will be achieved.

GENERAL

     Investment  methods  described in this Prospectus are among those which the
Fund has the power to utilize.  Some may be employed on a regular basis;  others
may not be used at all.  Accordingly,  reference  to any  particular  method  or
technique  carries no implication that it will be utilized or, if it is, that it
will be successful.

MANAGEMENT
- --------------------------------------------------------------------------------

BOARD OF DIRECTORS

     The  business  and  affairs  of RBB and the  Fund  are  managed  under  the
direction of RBB's Board of Directors.

INVESTMENT ADVISER

     Boston Partners Asset Management,  L.P.,  located at 28 State Street,  21st
Floor, Boston, Massachusetts 02109, serves as the Fund's investment adviser. The
Adviser  provides  investment  management  and investment  advisory  services to
investment  companies and other institutional  accounts that had aggregate total
assets under  management as of October 31, 1998 in excess of $16.0 billion.  The
adviser  is  organized  as a Delaware  limited  partnership  whose sole  general
partner is Boston Partners, Inc., a Delaware corporation.

     Subject to the  supervision and direction of the Fund's Board of Directors,
the  Adviser  manages  the  Fund's  portfolio  in  accordance  with  the  Fund's
investment  objective and  policies,  makes  investment  decisions for the Fund,
places  orders  to  purchase  and  sell  securities,  and  employs  professional
portfolio managers and securities  analysts who provide research services to the
Fund. For its services to the Fund,  the Adviser is paid a monthly  advisory fee
computed at

                                       6
<PAGE>

an annual rate of 0.80% of the Fund's average daily net assets.  The Adviser has
notified RBB, however, that it intends to limit total Fund operating expenses to
1.00% during the current fiscal year.

PORTFOLIO MANAGEMENT

     The day-to-day  portfolio  management of the Fund is the  responsibility of
Wayne J. Archambo who is senior portfolio manager of the Adviser and a member of
the Adviser's Equity Strategy  Committee.  Mr. Archambo  oversees the investment
activities of the  Advisers'  $1.5 billion of  mid-capitalization  activities as
well as $1  billion in small  capitalization  activities.  Prior to joining  the
Adviser in April 1995,  Mr.  Archambo was employed by The Boston  Company  Asset
Management from 1989 through April 1995 where he was a senior portfolio  manager
and a member of the firm's Equity  Policy  Committee.  Mr.  Archambo has over 15
years of investment experience and is a Chartered Financial Analyst.

ADMINISTRATOR

     PFPC  Inc.  ("PFPC")  serves  as  administrator  to the Fund and  generally
assists the Fund in all aspects of its administration and operations,  including
matters relating to the maintenance of financial records and accounting. For its
services,  PFPC  receives  a fee  calculated  at an annual  rate of .125% of the
Fund's average daily net assets,  with a minimum  annual fee of $75,000  payable
monthly on a pro rata basis.

TRANSFER AGENT, DIVIDEND DISBURSING AGENT, AND CUSTODIAN

     PFPC Trust Company, an indirect  wholly-owned subsidiary of PNC Bank Corp.,
will succeed PNC Bank, National Association ("PNC Bank") as the Fund's custodian
pursuant to an assignment. PNC Bank will continue to provide certain services to
PFPC Trust  Company.  PFPC  serves as the  Fund's  transfer  agent and  dividend
disbursing  agent.  The  principal  offices of PFPC,  an indirect,  wholly-owned
subsidiary  of PNC  Bank,  are  located  at 400  Bellevue  Parkway,  Wilmington,
Delaware  19809.  PFPCmay  enter  into  shareholder  servicing  with  registered
broker-dealers  who have entered  into dealer  agreements  with the  Distributor
("Authorized Dealers") for the provision of certain shareholder support services
to customers of such  Authorized  Dealers who are  shareholders of the Fund. The
services  provided  and the fees  payable  by the Fund for  these  services  are
described in the Statement of Additional Information under "Investment Advisory,
Distribution and Servicing Arrangements."

ADMINISTRATIVE SERVICES AGENT

     Provident  Distributors,   Inc.  ("PDI")  provides  certain  administrative
services  to the Fund's  Institutional  Shares not  otherwise  provided by PFPC.
PDI's  principal   business  address  is  Four  Falls  Corporate  Center,   West
Conshohocken,  Pennsylvania  19428. PDI furnishes certain internal  quasi-legal,
executive and administrative services to the Fund, acts as a liaison between the
Fund and its  various  service  providers  and  coordinates  and  assists in the
preparation of reports prepared on behalf of the Fund. For its services,  PDI is
entitled  to a  monthly  fee  calculated  at the  annual  rate  of  .15%  of the
respective  average daily net assets of the Fund's  Institutional  Class. PDI is
currently  waiving fees in excess of .03% of the average daily net assets of the
Fund's Institutional Class.

DISTRIBUTOR

     PDI acts as distributor for the Shares pursuant to a distribution agreement
(the "Distribution Agreement") with RBB on behalf of the Shares.

EXPENSES

     The  expenses  of the  Fund  are  deducted  from its  total  income  before
dividends  are  paid.  Any  general   expenses  of  RBB  that  are  not  readily
identifiable  as belonging to a particular  investment  portfolio of RBB will be
allocated  among all  investment  portfolios  of RBB based upon the relative net
assets of the investment portfolios. The Institutional Class of the Fund pays an
administrative  services  fee,  and may pay a different  share than the Investor
Class of other expenses

                                       7
<PAGE>

(excluding  advisory and custodial fees) if those expenses are actually incurred
in a different  amount by the  Institutional  Class or if it receives  different
services.

     The  Adviser  may  assume  expenses  of the Fund from time to time.  To the
extent any service  providers  assume  expenses of the Fund,  such assumption of
expenses will have the effect of lowering the Fund's  overall  expense ratio and
increasing its yield to investors.

HOW TO PURCHASE SHARES
- --------------------------------------------------------------------------------

GENERAL

     Shares  representing an interest in the Fund are offered  continuously  for
sale by the  Distributor.  Shares may be purchased  initially by completing  the
application  included in this  Prospectus and forwarding the  application to the
Fund's transfer agent,  PFPC.  Purchases of Shares may be effected by wire to an
account to be specified by PFPC or by mailing a check or Federal  Reserve Draft,
payable to the order of "The Boston Partners Mid Cap Value Fund," c/o PFPC Inc.,
P.O. Box 8852,  Wilmington,  Delaware  19899-8852.  The name of the Fund, Boston
Partners  Mid Cap Value Fund,  must also appear on the check or Federal  Reserve
Draft. Shareholders may not purchase shares of the Boston Partners Mid Cap Value
Fund with a check issued by a third party and endorsed over to the Fund. Federal
Reserve  Drafts are  available  at  national  banks or any state bank which is a
member of the Federal Reserve System. Initial investments in the Fund must be at
least $100,000 and subsequent  investments must be at least $5,000. For purposes
of meeting the minimum initial  purchase,  clients which are part of endowments,
foundation  or other  related  groups may be  aggregated.  The Fund reserves the
right to suspend  the  offering  of Shares for a period of time or to reject any
purchase order.

     Shares may be purchased on any  Business  Day. A "Business  Day" is any day
that the New York  Stock  Exchange,  Inc.  (the  "NYSE")  is open for  business.
Currently,  the NYSE is closed on weekends and New Year's Day, Dr. Martin Luther
King, Jr. Day,  Presidents' Day, Good Friday,  Memorial Day,  Independence  Day,
Labor Day,  Thanksgiving  Day and Christmas  Day and on the preceding  Friday or
subsequent Monday when one of these holidays falls on a Saturday or Sunday.

     The price paid for Shares  purchased  is based on the net asset  value next
computed  after a purchase  order is  received  in good order by the Fund or its
agents. Orders received by the Fund or its agents prior to the close of the NYSE
(generally  4:00 p.m.  Eastern Time) are priced at that Business Day's net asset
value. Orders received by the Fund or its agents after its close of the NYSE are
priced at the net asset value next determined on the following  Business Day. In
those cases where an investor  pays for Shares by check,  the  purchase  will be
effected  at the net asset  value next  determined  after the Fund or its agents
receives the order and the completed application.

     Shares  may  be  purchased  and  subsequent  investments  may  be  made  by
principals  and  employees of the Adviser,  and by their  spouses and  children,
either  directly or through their  individual  retirement  accounts,  and by any
pension and  profit-sharing  plan of the Adviser,  without  being subject to the
minimum investment limitations.

     An investor may also purchase  Shares by having his bank or his broker wire
Federal Funds to PFPC. An investor's bank or broker may impose a charge for this
service.  The Fund does not currently impose a service charge for effecting wire
transfers  but  reserves  the right to do so in the  future.  In order to ensure
prompt receipt of an investor's Federal Funds wire for an initial investment, it
is important that an investor follows these steps:

     A. Telephone the Fund's transfer agent, PFPC, toll-free (888) 261-4073, and
provide PFPC with your name, address,  telephone number,  Social Security or Tax
Identification  Number, the Fund selected,  the amount being wired, and by which
bank. PFPC will then provide an investor with a Fund account  number.  Investors
with existing accounts should also notify PFPC prior to wiring funds.

                                       8
<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>

<TABLE>
<CAPTION>
                      BOSTON PARTNERS MID CAP VALUE FUND         bp
                             (INSTITUTIONAL CLASS)               BOSTON PARTNERS ASSET MANAGEMENT, L.P.   
                                                                 --------------------------------------  
                                                                 
ACCOUNT APPLICATION
PLEASE NOTE:  Do not use this form to open a retirement plan account.  For an IRA application or help with this Application,
please call 1-888-261-4073.
<S>                        <C>   

                           (Please check the appropriate box(es) below.)
1. Account Registration:
                           |_|  Individual           |_|  Joint Tenant          |_|  Other

                           ---------------------------------------------------------------------------------------------------------
                           Name                                                  SOCIAL SECURITY NUMBER OR TAX ID # OF PRIMARY OWNER

                           ---------------------------------------------------------------------------------------------------------
                           NAME OF JOINT OWNER                                        JOINT OWNER SOCIAL SECURITY NUMBER OR TAX ID #

                           For joint accounts, the account registrants will be joint tenants with right of survivorship and not 
                           tenants in common unless tenants in common or community property registrations are requested.

GIFT TO MINOR:             |_|   UNIFORM GIFTS/TRANSFER TO MINOR'S ACT

                           ---------------------------------------------------------------------------------------------------------
                           NAME OF ADULT CUSTODIAN (ONLY ONE PERMITTED)

                           ---------------------------------------------------------------------------------------------------------
                           NAME OF MINOR (ONLY ONE PERMITTED)

                           ---------------------------------------------------------------------------------------------------------
                           MINOR'S SOCIAL SECURITY NUMBER AND DATE OF BIRTH

CORPORATION,
PARTNERSHIP, TRUST
OR OTHER ENTITY:
                           ---------------------------------------------------------------------------------------------------------
                           NAME OF CORPORATION, PARTNERSHIP, OR OTHER                                          NAME(S) OF TRUSTEE(S)

                           ---------------------------------------------------------------------------------------------------------
                           TAXPAYER IDENTIFICATION NUMBER

2. Mailing Address:        ---------------------------------------------------------------------------------------------------------
                           STREET OR P.O. BOX AND/OR APARTMENT NUMBER                                                               
                            
                           ---------------------------------------------------------------------------------------------------------
                           CITY                                                 STATE                         ZIP CODE

                           ---------------------------------------------------------------------------------------------------------
                           DAY PHONE NUMBER                                                             EVENING PHONE NUMBER


3. Investment Information: Minimum initial investment of $100,000.                       Amount of investment $____________

                           Make the check payable to Boston Partners Mid Cap Value Fund.

                           Shareholders may not purchase shares of this Fund with a check issued by a third party and endorsed 
                           over to the Fund.

DISTRIBUTION               NOTE:  Dividends and capital gains may be reinvested or paid by check.  If no options are selected
OPTIONS:                   below, both dividends and capital gains will be reinvested in additional Fund shares.

                           DIVIDENDS |_|   Pay by check |_|   Reinvest |_|   CAPITAL GAINS |_|   Pay by check |_|   Reinvest   |_|


<PAGE>
4. Telephone Redemption:
                           To use this option, you must initial the appropriate line below.
                           I authorize the Transfer Agent to accept instructions from any persons
                           to redeem or exchange shares in my account(s) by telephone in
                           accordance with the procedures and conditions set forth in the Fund's current prospectus.

                           ________________________                  ____________________  Redeem shares, and send the proceeds to
                              individual initial                          joint initial    the address of record.


                           ________________________                  ____________________  Exchange shares for shares of The Boston
                              individual initial                          joint initial    Partners Large Cap Value Fund or Boston,
                                                                                           Partners Bond Fund.
                                                                                        
5. Automatic Investment     
   Plan:                   The Automatic Investment Plan which is available to shareholders of the Fund, makes possible regularly 
                           scheduled purchases of Fund shares to allow dollar-cost averaging. The Fund's Transfer Agent can         
                           arrange for an amount of money selected by you to be deducted from your checking account and used to     
                           purchase shares of the Fund.     

                              
                           Please debit $________ from my checking account (named below) on or about the 20th of the month. PLEASE
                           ATTACH AN UNSIGNED, VOIDED CHECK.

                           |_|  Monthly     |_|  Every Alternate Month |_|  Quarterly   |_|  Other


                           ---------------------------------------------------------------------------------------------------------
BANK OF RECORD:            BANK NAME                                                                 STREET ADDRESS OR P.O. BOX
                    
                           ---------------------------------------------------------------------------------------------------------
                           CITY                                        STATE                                    ZIP CODE

                           ---------------------------------------------------------------------------------------------------------
                           BANK ABA NUMBER                                                           BANK ACCOUNT NUMBER

6. Signatures

                           The undersigned warrants that I (we) have full authority and, if a natural person, I (we) am (are)
                           of legal age to purchase shares pursuant to this Account Application, and I (we) have received a
                           current prospectus for the Fund in which I (we) am (are) investing.

                           Under the Interest and Dividend Tax Compliance Act of 1983, the Fund is required to have the following 
                           certification:
                           Under penalties of perjury, I certify that:
                           (1) The number shown on this form is my correct taxpayer identification number (or I am waiting for a
                               number to be issued to me), and 
                           (2) I am not subject to backup withholding because (a) I am exempt from backup withholding, or (b) I have
                               not been notified by the Internal Revenue Service that I am subject to 31% backup withholding as a
                               result of a failure to report all interest or dividends, or (c) the IRS has notified me that I am no
                               longer subject to backup withholding.

                           NOTE: YOU MUST CROSS OUT ITEM (2) ABOVE IF YOU HAVE BEEN NOTIFIED BY THE IRS THAT YOU ARE CURRENTLY
                           SUBJECT TO BACKUP WITHHOLDING BECAUSE YOU HAVE FAILED TO REPORT ALL INTEREST AND DIVIDENDS ON YOUR TAX
                           RETURN. THE INTERNAL REVENUE SERVICE DOES NOT REQUIRE YOUR CONSENT TO ANY PROVISION OF THIS DOCUMENT
                           OTHER THAN THE CERTIFICATION REQUIRED TO AUDIT BACKUP WITHHOLDING.


                           ---------------------------------------------------------------------------------------------------------
                           SIGNATURE OF APPLICANT                                                           DATE


                           ---------------------------------------------------------------------------------------------------------
                           PRINT NAME                                                                 TITLE (IF APPLICABLE)


                           ---------------------------------------------------------------------------------------------------------
                           SIGNATURE OF JOINT OWNER                                                         DATE


                           ---------------------------------------------------------------------------------------------------------
                           PRINT NAME                                                                 TITLE (IF APPLICABLE)



                           (If you are signing for a corporation, you must indicate corporate office or title. If you wish
                           additional signatories on the account, please include a corporate resolution. If signing as a fiduciary,
                           you must indicate capacity.)

                           For information on additional options, such as IRA Applications, rollover requests for qualified
                           retirement plans, or for wire instructions, please call us at 1-888-261-4073.


                           MAIL COMPLETED ACCOUNT APPLICATION AND CHECK TO:     THE BOSTON PARTNERS MID CAP VALUE FUND
                                                                                c/o PFPC INC.
                                                                                P.O. BOX 8852
                                                                                WILMINGTON, DE  19899-8852

</TABLE>
<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>

     B. Instruct your bank or broker to wire the specified amount, together with
your assigned account number, to PFPC's account with PNC Bank:

                  PNC Bank, N.A.
                  Philadelphia, PA 19103
                  ABA NUMBER: 0310-0005-3
                  CREDITING ACCOUNT NUMBER: 86-1108-2507
                  FROM: (name of investor)
                  ACCOUNT NUMBER: (Investor's account number with the Fund)
                  FOR PURCHASE OF: (name of the Fund)
                  AMOUNT: (amount to be invested)

     C. Fully complete and sign the application and mail it to the address shown
thereon. PFPC will not process purchases until it receives a fully completed and
signed application.

     For subsequent investments, an investor should follow steps A and B above.

AUTOMATIC INVESTING

     Additional  investments in Shares may be made  automatically by authorizing
the Fund's  transfer agent to withdraw  funds from your bank account.  Investors
desiring to  participate  in the  automatic  investing  program  should call the
Fund's transfer agent, PFPC, at (888) 261-4073 to obtain the appropriate forms.

HOW TO REDEEM AND EXCHANGE SHARES
- --------------------------------------------------------------------------------

REDEMPTION BY MAIL

     Shareholders may redeem for cash some or all of their Shares of the Fund at
any time.  To do so, a written  request in proper form must be sent  directly to
Boston  Partners Mid Cap Value Fund, c/o PFPC Inc.,  P.O. Box 8852,  Wilmington,
Delaware 19899-8852. There is no charge for a redemption.

     A request for  redemption  must be signed by all persons in whose names the
Shares  are   registered.   Signatures  must  conform  exactly  to  the  account
registration.  If the proceeds of the redemption would exceed $10,000, or if the
proceeds are not to be paid to the record owner at the record address, or if the
shareholder is a corporation, partnership, trust or fiduciary, signature(s) must
be  guaranteed  according  to the  procedures  described  below under  "Exchange
Privilege."

     Generally,  a properly signed written  request with any required  signature
guarantee  is all that is required  for a  redemption.  In some cases,  however,
other  documents may be  necessary.  In the case of  shareholders  holding share
certificates,  the certificates for the shares being redeemed must accompany the
redemption  request.  Additional  documentary  evidence  of  authority  is  also
required by the Fund's transfer agent in the event  redemption is requested by a
corporation, partnership, trust, fiduciary, executor or administrator.

INVOLUNTARY REDEMPTION

     The Fund reserves the right to redeem a  shareholder's  account at any time
the  net  asset  value  of the  account  falls  below  $500 as the  result  of a
redemption or an exchange request. Shareholders will be notified in writing that
the value of their account is less than $500 and will be allowed 30 days to make
additional investments before the redemption is processed.

PAYMENT OF REDEMPTION PROCEEDS

     In all cases,  the  redemption  price is the net asset value per share next
determined  after the request for  redemption  is received in proper form by the
Fund or its agents. Payment for Shares redeemed is made by check mailed within

                                       9
<PAGE>

seven days after  acceptance  by the Fund or its agents of the  request  and any
other necessary  documents in proper order. Such payment may be postponed or the
right of  redemption  suspended as provided by the 1940 Act. If the Shares to be
redeemed have been recently  purchased by check,  the Fund's  transfer agent may
delay  mailing  a  redemption  check,  which  may be a period  of up to 15 days,
pending a determination  that the check has cleared.  The Fund has elected to be
governed by Rule 18f-1 under the 1940 Act so that a portfolio  is  obligated  to
redeem its shares  solely in cash up to the lesser of  $250,000 or 1% of its net
asset value during any 90-day period for any one shareholder of a portfolio.

EXCHANGE PRIVILEGE

     The exchange  privilege is available to shareholders  residing in any state
in which the Shares  being  acquired  may be legally  sold.  A  shareholder  may
exchange  Shares  of the Fund  for  Institutional  Shares  of any  other  Boston
Partners  Fund  of  RBB,  subject  to  restrictions  described  under  "Exchange
Privilege  Limitations"  below.  Such exchange will be effected at the net asset
value of the exchanged  Fund and the net asset value of the Fund being  acquired
next  determined  after  receipt of a request for an exchange by the Fund or its
agents.  An exchange of Shares will be treated as a sale for federal  income tax
purposes.  See "Taxes." A  shareholder  wishing to make an exchange may do so by
sending a written request to PFPC.

     If the exchanging  shareholder does not currently own Institutional  Shares
of the  Fund  into  which he  would  like to  exchange,  a new  account  will be
established with the same registration, dividend and capital gain options as the
account from which shares are exchanged,  unless otherwise  specified in writing
by the shareholder with all signatures guaranteed.  A signature guarantee may be
obtained from a domestic bank or trust company,  broker, dealer, clearing agency
or savings association who are participants in a medallion program recognized by
the Securities Transfer Association. The three recognized medallion programs are
Securities Transfer Agents Medallion Program (STAMP),  Stock Exchanges Medallion
Program (SEMP) and New York Stock Exchange,  Inc.  Medallion  Signature  Program
(MSP).  Signature  guarantees  that are not part of these  programs  will not be
accepted.  The exchange  privilege may be modified or terminated at any time, or
from time to time, by RBB, upon 60 days' written notice to shareholders.

     If an exchange is to a new account in the acquired  Fund,  the dollar value
of Shares  acquired must equal or exceed that Fund's  minimum for a new account;
if to an  existing  account,  the dollar  value must equal or exceed that Fund's
minimum for subsequent investments. If any amount remains in the Fund from which
the exchange is being made,  such amount must not drop below the minimum account
value required by the Fund.

EXCHANGE PRIVILEGE LIMITATIONS

     The Fund's exchange privilege is not intended to afford  shareholders a way
to speculate on  short-term  movements in the market.  Accordingly,  in order to
prevent excessive use of the exchange privilege that may potentially disrupt the
management of the Fund and increase transactions costs, the Fund has established
a policy of limiting excessive exchange activity.

     Shareholders are entitled to six (6) exchange redemptions (at least 30 days
apart)  from the Fund  during any  twelve-month  period.  Notwithstanding  these
limitations,  the  Fund  reserves  the  right to  reject  any  purchase  request
(including  purchases by exchange)  that is deemed to be disruptive to efficient
portfolio management.

TELEPHONE TRANSACTIONS

     In order to request a telephone exchange or redemption,  a shareholder must
have  completed  and  returned  an account  application  containing  a telephone
election.  To add a telephone  option to an existing account that previously did
not provide for this option, a Telephone  Authorization  Form must be filed with
PFPC.  This form is available  from PFPC.  Once this election has been made, the
shareholder  may simply  contact  PFPC by  telephone  to request the exchange or
redemption by calling (888)  261-4073.  Neither RBB, the Fund, the  Distributor,
the  Administrator  nor any  other  Fund  agent  will be  liable  for any  loss,
liability,  cost or expense for following RBB's telephone transaction procedures
described  below or for following  instructions  communicated  by telephone that
they reasonably believe to be genuine.

                                       10
<PAGE>

     RBB's telephone transaction  procedures include the following measures: (1)
requiring the appropriate  telephone  transaction privilege forms; (2) requiring
the  caller to provide  the names of the  account  owners,  the  account  social
security number and name of the Fund, all of which must match RBB's records; (3)
requiring RBB's service representative to complete a telephone transaction form,
listing  all of the above  caller  identification  information;  (4)  permitting
exchanges only if the two account  registrations  are  identical;  (5) requiring
that  redemption  proceeds be sent only by check to the account owners of record
at the  address of  record,  or by wire only to the owners of record at the bank
account  of  record;  (6)  sending a  written  confirmation  for each  telephone
transaction  to the owners of record at the  address of record  within  five (5)
Business Days of the call; and (7) maintaining  tapes of telephone  transactions
for six months, if the fund elects to record shareholder telephone transactions.
For  accounts  held of record by  broker-dealers  (other than the  Distributor),
financial  institutions,   securities  dealers,  financial  planners  and  other
industry  professionals,  additional  documentation or information regarding the
scope of a caller's authority is required.  Finally, for telephone  transactions
in accounts held jointly, additional information regarding other account holders
is required. Telephone transactions will not be permitted in connection with IRA
or other  retirement  plan accounts or by an  attorney-in-fact  under a power of
attorney.

NET ASSET VALUE
- --------------------------------------------------------------------------------
     The net asset  value for each class of a fund is  calculated  by adding the
value of the  proportionate  interest of the class in a fund's cash,  securities
and other  assets,  deducting  actual and accrued  liabilities  of the class and
dividing the result by the number of  outstanding  shares of the class.  The net
asset value of each class is calculated  independently  of each other class. The
net asset values are calculated as of the close of regular  trading on the NYSE,
generally 4:00 p.m. Eastern Time on each Business Day.

     Valuation of securities held by the Fund is as follows:  securities  traded
on a national  securities  exchange or on the NASDAQ  National Market System are
valued at the last reported sale price that day; securities traded on a national
securities exchange or on the NASDAQ National Market System for which there were
no sales on that day and securities traded on other over-the-counter markets for
which market  quotations are readily available are valued at the mean of the bid
and asked prices;  and  securities  for which market  quotations are not readily
available  are valued at fair  market  value as  determined  in good faith by or
under the  direction of RBB's Board of Directors.  The amortized  cost method of
valuation may also be used with respect to debt  obligations  with sixty days or
less remaining to maturity.

     With the approval of RBB's Board of  Directors,  the Fund may use a pricing
service,  bank or broker-dealer  experienced in such matters to value the Fund's
securities. A more detailed discussion of net asset value and security valuation
is contained in the Statement of Additional Information.

DIVIDENDS AND DISTRIBUTIONS
- --------------------------------------------------------------------------------
     The Fund will distribute substantially all of the net investment income and
net realized capital gains, if any, of the Fund to the Fund's shareholders.  All
distributions  are  reinvested  in the form of  additional  full and  fractional
Shares unless a shareholder elects otherwise.

     The Fund will declare and pay dividends from net investment income annually
and pays them in the  calendar  year in which they are  declared,  generally  in
December.  Net realized capital gains (including net short-term  capital gains),
if any, will be distributed at least annually.

                                       11
<PAGE>

TAXES
- --------------------------------------------------------------------------------
     The  following  discussion is only a brief summary of some of the important
tax considerations  generally affecting the Fund and its shareholders and is not
intended as a substitute for careful tax planning. Accordingly, investors in the
Fund should consult their tax advisers with specific  reference to their own tax
situation.

     The Fund will elect to be taxed as a  regulated  investment  company  under
Subchapter M of the Internal  Revenue Code of 1986,  as amended.  So long as the
Fund qualifies for this tax treatment, it will be relieved of federal income tax
on amounts  distributed to  shareholders,  but  shareholders,  unless  otherwise
exempt, will pay income or capital gains taxes on amounts so distributed (except
distributions  that are  treated as a return of capital)  regardless  of whether
such distributions are paid in cash or reinvested in additional shares.

     Distributions  out of the "net capital  gain" (the excess of net  long-term
capital  gain over net  short-term  capital  loss),  if any, of the Fund will be
taxed to  shareholders  as long-term  capital gains  regardless of the length of
time a shareholder  has held his Shares,  whether such gain was reflected in the
price  paid for the  Shares,  or  whether  such gain was  attributable  to bonds
bearing tax-exempt  interest.  All other  distributions,  to the extent they are
taxable, are taxed to shareholders as ordinary income.

     RBB will send written  notices to shareholders  annually  regarding the tax
status of distributions made by the Fund.  Dividends declared in December of any
year payable to  shareholders of record on a specified date in such a month will
be deemed to have been  received by the  shareholders  on December 31,  provided
such dividends are paid during  January of the following  year. The Fund intends
to make  sufficient  actual  or  deemed  distributions  prior to the end of each
calendar year to avoid liability for federal excise tax.

     Investors  should be careful to  consider  the tax  implications  of buying
shares just prior to a distribution.  The price of shares purchased at that time
will  reflect  the  amount  of the  forthcoming  distribution.  Those  investors
purchasing shares just prior to a distribution will nevertheless be taxed on the
entire amount of the  distribution  received,  although the  distribution is, in
effect, a return of capital.

     Shareholders  who exchange  shares  representing  interests in one Fund for
shares  representing  interests in another Fund will generally recognize capital
gain or loss for federal income tax purposes.

     Shareholders  who are  nonresident  alien  individuals,  foreign  trusts or
estates,  foreign  corporations  or  foreign  partnerships  may  be  subject  to
different U.S. Federal income tax treatment.

MULTI-CLASS STRUCTURE
- --------------------------------------------------------------------------------
     The Fund  offers one other  class of  shares,  Investor  Shares,  which are
offered  directly to  individual  investors  pursuant to a separate  prospectus.
Shares of each class  represent  equal pro rata interests in the Fund and accrue
dividends and calculate net asset value and  performance  quotations in the same
manner.  The Fund will quote  performance of the Investor Shares separately from
Institutional  Shares.  Because of different  expenses paid by the Institutional
Shares,  the total  return on such shares can be  expected,  at any time,  to be
different than the total return on Investor Shares. Information concerning these
other classes may be obtained by calling the Fund at (888) 261-4073.

                                       12
<PAGE>

DESCRIPTION OF SHARES
- --------------------------------------------------------------------------------
     RBB has authorized  capital of thirty billion shares of Common Stock, $.001
par value per share,  of which 18.326  billion  shares are currently  classified
into 97 different  classes of Common Stock.  See  "Description of Shares" in the
Statement of Additional Information."

     THIS  PROSPECTUS AND THE STATEMENT OF ADDITIONAL  INFORMATION  INCORPORATED
HEREIN RELATE  PRIMARILY TO BOSTON PARTNERS MID CAP VALUE FUND AND DESCRIBE ONLY
THE INVESTMENT OBJECTIVE AND POLICIES,  OPERATIONS,  CONTRACTS AND OTHER MATTERS
RELATING TO BOSTON PARTNERS MID CAP VALUE FUND.

     Each  share  that   represents  an  interest  in  the  Fund  has  an  equal
proportionate interest in the assets belonging to the Fund with each other share
that  represents  an  interest  in the Fund,  even where a share has a different
class  designation  than  another  share  representing  an interest in the Fund.
Shares of the Fund do not have preemptive or conversion rights.  When issued for
payment  as  described  in this  Prospectus,  Shares  will  be  fully  paid  and
non-assessable.

     RBB  currently  does not intend to hold  annual  meetings  of  shareholders
except  as  required  by the 1940 Act or other  applicable  law.  The law  under
certain circumstances provides shareholders with the right to call for a meeting
of shareholders to consider the removal of one or more directors.  To the extent
required by law, RBB will assist in shareholder communication in such matters.

     Holders of Shares of the Fund will vote in the  aggregate  and not by class
on all matters, except where otherwise required by law. Further, shareholders of
all investment portfolios of RBB will vote in the aggregate and not by portfolio
except as otherwise  required by law or when the Board of  Directors  determines
that the matter to be voted upon affects only the interests of the  shareholders
of  a  particular  investment  portfolio.   (See  the  Statement  of  Additional
Information under "Additional  Information  Concerning Fund Shares" for examples
when the  1940  Act  requires  voting  by  investment  portfolio  or by  class.)
Shareholders  of the Fund are  entitled  to one vote for each  full  share  held
(irrespective of class or portfolio) and fractional votes for fractional  shares
held.  Voting rights are not cumulative  and,  accordingly,  the holders of more
than 50% of the  aggregate  shares of Common  Stock of the Fund may elect all of
the directors.

     As of November 16, 1998, to the Fund's knowledge,  no person held of record
or beneficially 25% or more of the outstanding shares of all classes of RBB.

OTHER INFORMATION
- --------------------------------------------------------------------------------

REPORTS AND INQUIRIES

     Shareholders  will receive  unaudited  semi-annual  reports  describing the
Fund's  investment   operations  and  annual  financial  statements  audited  by
independent accountants. Shareholder inquiries should be addressed to PFPC Inc.,
the Fund's transfer agent, Bellevue Park Corporate Center, 400 Bellevue Parkway,
Wilmington, Delaware 19809, toll-free (888) 261-4073.

SHARE CERTIFICATES

     In  the  interest  of  economy  and  convenience,   physical   certificates
representing Shares in the Fund are not normally issued.


                                       13
<PAGE>

HISTORICAL PERFORMANCE INFORMATION

     For the period  from  commencement  of  operations  (June 2, 1997)  through
August 31, 1998, the total return (not annualized) for the  Institutional  Class
of Shares of the Fund was as follows:

     Unannualized investment returns for the period ended August 31, 1998.

                                                                         Since
                                                                       Inception
                                                                       ---------
     Boston Partners Mid Cap Value Fund
         (Institutional Shares) ....................................     (3.92)%

     The total return  assumes the  reinvestment  of all  dividends  and capital
gains and reflects expense reimbursements and investment advisory fee waivers in
effect.  Without these expense reimbursements or waivers, the Fund's performance
would have been lower.  Of course,  past  performance  is no guarantee of future
results.  Investment return and principal value will fluctuate,  so that Shares,
when  redeemed,  may be worth  more or less  than the  original  cost.  For more
information on performance,  see  "Performance  Information" in the Statement of
Additional Information.

     The table below  presents the Composite  performance  history of certain of
the  Adviser's  managed  accounts on an  annualized  basis for the period  ended
August 31, 1998.  The  Composite is  comprised  of the  Adviser's  institutional
accounts  and other  privately  managed  accounts  with  investment  objectives,
policies and strategies substantially similar to those of the Fund, although the
accounts  have  longer  operating  histories  than  the  Fund,  which  commenced
operations on June 2, 1997. The Composite  performance  information includes the
reinvestment  of dividends  received in the  underlying  securities and includes
payment of  investment  advisory  fees.  The privately  managed  accounts in the
Composite are only available to the Adviser's  institutional  advisory  clients.
The past  performance  of the  accounts  which  comprise  the  Composite  is not
indicative  of the future  performance  of the Fund.  These  accounts have lower
investment  advisory  fees than the Fund and the Composite  performance  figures
would have been lower if subject to the higher fees and expenses incurred by the
Fund. These private accounts are not subject to the same investment limitations,
diversification  requirements  and other  restrictions  which are  imposed  upon
mutual  funds  under  the 1940 Act and the  Internal  Revenue  Code,  which,  if
imposed,  may have adversely affected the performance  results of the Composite.
Listed below the  performance  history for the Composite is a comparative  index
comprised  of  securities  similar to those in which  accounts  contained in the
Composite are invested.

     Annualized investment returns for the period ended August 31, 1998.

                                                One         Three        Since
                                               Year         Years      Inception
                                               ----         -----      ---------
     Composite Performance ...............    (12.73)%       N/A        (3.15)%
     Russell 2500 Index ..................    (16.84)%       N/A        (5.74)%

* The Adviser commenced managing these accounts on June 2, 1997.

     The Russell 2500 Index represents the largest 3,000 companies  domiciled in
the United  States minus the largest 500  companies as  determined by the market
value of such companies.

                                       14
<PAGE>

FUTURE PERFORMANCE INFORMATION

     From  time to time,  the  Fund may  advertise  its  performance,  including
comparisons  to other  mutual funds with similar  investment  objectives  and to
stock or other relevant indices.  All such  advertisements will show the average
annual total return over one, five and ten year periods or, if such periods have
not yet elapsed,  shorter  periods  corresponding  to the life of the Fund. Such
total  return  quotations  will be computed by finding  the  compounded  average
annual total  return for each time period that would equate the assumed  initial
investment of $1,000 to the ending redeemable value, net of fees, according to a
required standardized  calculation.  The standard calculation is required by the
SEC to provide consistency and comparability in investment company  advertising.
The Fund may also from time to time  include in such  advertising  an  aggregate
total return figure or a total return figure that is not calculated according to
the  standardized  formula  in order  to  compare  more  accurately  the  Fund's
performance with other measures of investment  return.  For example,  the Fund's
total return may be compared with data published by Lipper Analytical  Services,
Inc., CDA  Investment  Technologies,  Inc. or  Weisenberger  Investment  Company
Service,  or  with  the  performance  of the  Russell  2500  Index.  Performance
information  may also include  evaluation of the Fund by  nationally  recognized
ranking services and information as reported in financial  publications  such as
Business  Week,  Fortune,   Institutional  Investor,  Money  Magazine,   Forbes,
Barron's,  The Wall  Street  Journal,  The New York  Times,  or other  national,
regional or local publications.  All advertisements  containing performance data
will include a legend  disclosing  that such  performance  data  represents past
performance and that the investment  return and principal value of an investment
will fluctuate so that an investor's Shares, when redeemed, may be worth more or
less than their original cost.

<PAGE>

NO PERSON HAS BEEN  AUTHORIZED TO GIVE ANY  INFORMATION  OR MAKE ANY  PROSPECTUS
REPRESENTATIONS  NOT  CONTAINED  IN THIS  PROSPECTUS  OR IN RBB'S  STATEMENT  OF
ADDITIONAL  INFORMATION  INCORPORATED HEREIN BY DECEMBER 29, 1998 REFERENCE,  IN
CONNECTION WITH THE OFFERING MADE BY THIS PROSPECTUS AND, IF GIVEN OR MADE, SUCH
REPRESENTATIONS  MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY RBB OR ITS
DISTRIBUTOR.  THIS  PROSPECTUS  DOES NOT CONSTITUTE AN OFFERING BY RBB OR BY THE
DISTRIBUTOR IN ANY JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY BE MADE.



                              ---------------------
                                TABLE OF CONTENTS
                                                                            PAGE
                                                                            ----
EXPENSE TABLE ..........................................................       2
FINANCIAL HIGHLIGHTS ...................................................       2
INTRODUCTION ...........................................................       4
INVESTMENT OBJECTIVES AND POLICIES .....................................       4
INVESTMENT LIMITATIONS .................................................       5
RISK FACTORS ...........................................................       5
YEAR 2000 ..............................................................       6
MANAGEMENT .............................................................       6
HOW TO PURCHASE SHARES .................................................       8
HOW TO REDEEM AND EXCHANGE SHARES ......................................       9
NET ASSET VALUE ........................................................      11
DIVIDENDS AND DISTRIBUTIONS ............................................      11
TAXES ..................................................................      12
MULTI-CLASS STRUCTURE ..................................................      12
DESCRIPTION OF SHARES ..................................................      13
OTHER INFORMATION ......................................................      13
                                                                    
INVESTMENT ADVISER
Boston Partners Asset Management, L.P.
Boston, Massachusetts

CUSTODIAN
PFPC Trust Company
Wilmington, Delaware

TRANSFER AGENT AND ADMINISTRATOR
PFPC Inc.
Wilmington, Delaware

DISTRIBUTOR
Provident Distributors, Inc.
West Conshohocken, Pennsylvania

COUNSEL
Drinker Biddle & Reath LLP
Philadelphia, Pennsylvania

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers LLP
Philadelphia, Pennsylvania

[LOGO GRAPHIC OMITTED]

<PAGE>
PROSPECTUS
DECEMBER 29, 1998
                                 BOSTON PARTNERS
                                     MID CAP
                                   VALUE FUND
                                (INVESTOR SHARES)


bp
BOSTON PARTNERS ASSET MANAGEMENT, L.P.
[LOGO GRAPHIC OMITTED]

<PAGE>

                       BOSTON PARTNERS MID CAP VALUE FUND
                                (INVESTOR CLASS)
                                       OF
                               THE RBB FUND, INC.

     Boston Partners Mid Cap Value Fund (the "Fund") is an investment  portfolio
of The RBB Fund, Inc. ("RBB"),  an open-end management  investment company.  The
shares of the Investor Class  ("Shares")  offered by this  Prospectus  represent
interests  in the Fund.  The Fund is a  diversified  fund that  seeks  long-term
growth of  capital,  with  current  income as a secondary  objective,  primarily
through  equity  investments,  such as common  stocks.  It seeks to achieve  its
objectives  by  investing  at least  65% of its total  assets  in a  diversified
portfolio   consisting   of  equity   securities   of  issuers   with  a  market
capitalization of primarily between $200 million and $6 billion,  and identified
by Boston Partners Asset  Management,  L.P. (the "Adviser") as equity securities
that it believes  possess value  characteristics.  The Adviser  examines various
factors in determining the value characteristics of such issuers,  including but
not limited to, price to book value ratios and price to earnings  ratios.  These
value  characteristics are examined in the context of the issuer's operating and
financial fundamentals such as return on equity, earnings growth and cash flow.

     This Prospectus contains  information that a prospective  investor needs to
know before  investing.  Please  keep it for future  reference.  A Statement  of
Additional  Information,  dated  December  29,  1998,  has been  filed  with the
Securities  and Exchange  Commission  and is  incorporated  by reference in this
Prospectus.  It may be obtained  free of charge  from the Fund by calling  (888)
261-4073.  The  Prospectus  and the  Statement  of  Additional  Information  are
available for reference,  along with other related  material on the SEC Internet
Web Site (http://www.sec.gov).

SHARES OF THE FUND ARE NOT DEPOSITS OR  OBLIGATIONS OF OR GUARANTEED OR ENDORSED
BY PNC BANK,  NATIONAL  ASSOCIATION,  PFPC  TRUST  COMPANY OR ANY OTHER BANK AND
SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT  INSURANCE  CORPORATION,
THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY. INVESTMENTS IN SHARES OF THE FUND
INVOLVE INVESTMENT RISKS, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.

- --------------------------------------------------------------------------------
THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THIS
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------

PROSPECTUS                                                    December 29 , 1998

<PAGE>

EXPENSE TABLE
- --------------------------------------------------------------------------------
     The following  table  illustrates  annual  operating  expenses  incurred by
Investor Shares of the Fund (after fee waivers and expense  reimbursements)  for
the fiscal  period ended August 31, 1998,  as a percentage  of average daily net
assets. An example based on the summary is also shown.

ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)
     Management Fees (after waivers)*. .................................    .58%
     12b-1 Fees (after waivers)* .......................................    .25%
     Other Expenses (after waivers and expense reimbursements) .........    .42%
                                                                           ----
   Total Fund Operating Expenses (after waivers and                       
     expense reimbursements)*. .........................................   1.25%
                                                                           ====

*  In the absence of fee waivers and  expense  reimbursements,  Management  Fees
   would be 0.80%;  12b-1 Fees would be 0.25%; Other Expenses would be .77%; and
   Total Fund Operating Expenses would be 1.82%.  Management Fees and 12b-1 Fees
   are each based on average daily net assets and are calculated  daily and paid
   monthly.

EXAMPLE

     An investor would pay the following  expenses on a $1,000 investment in the
Fund, assuming (1) a 5% annual return and (2) redemption at the end of each time
period:
                                                 ONE    THREE    FIVE       TEN
                                                YEAR    YEARS    YEARS     YEARS
                                                ----    -----    -----     -----
     Boston Partners Mid Cap Value Fund ......  $12     $37       $63      $140

     The Fee Table is  designed  to  assist an  investor  in  understanding  the
various  costs and expenses  that an investor in the Fund will bear  directly or
indirectly.  (For more complete  descriptions of the various costs and expenses,
see  "Management"  and  "Distribution  of Shares" below.) The Fee Table reflects
expense  reimbursements  and a voluntary waiver of Management Fees for the Fund,
which are expected to be in effect during the current fiscal year. However,  the
Adviser and the Fund's service providers are under no obligation with respect to
such fee waivers and expense  reimbursements  and there can be no assurance that
any future expense  reimbursements  and waivers of Management Fees will not vary
from the figures reflected in the Fee Table.

FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
     The "Financial  Highlights"  presented  below set forth certain  investment
results for shares of the Investor Class of the Fund for the period June 2, 1997
(date of inception) through August 31, 1997 and for the fiscal year ended August
31,  1998.  The  financial  data  included  in  this  table  should  be  read in
conjunction with the financial  statements and notes thereto and the unqualified
report   of   PricewaterhouseCoopers   LLP   ("PricewaterhouseCoopers"),   RBB's
independent accountants,  which are incorporated by reference into the Statement
of Additional  Information.  Further  information  about the  performance of the
Investor  Class of the Fund is available in the Annual  Report to  Shareholders.
Both  the  Statement  of  Additional   Information  and  the  Annual  Report  to
Shareholders  may be  obtained  from the Fund  free of  charge  by  calling  the
telephone number on page 1 of the prospectus.

                                       2
<PAGE>

                       BOSTON PARTNERS MID CAP VALUE FUND
           (FOR AN INVESTOR SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

<TABLE>
<CAPTION>
                                                                                                    FOR THE PERIOD
                                                                               FOR THE FISCAL        JUNE 2, 1997*
                                                                                 YEAR ENDED             THROUGH
                                                                               AUGUST 31, 1998      AUGUST 31, 1997
                                                                               ---------------      ---------------
<S>                                                                                 <C>                  <C>   
Per Share Operating Performance**
Net asset value, beginning of period ....................................           $11.01               $10.00
                                                                                    ------               ------
Net investment income (1) ...............................................             0.01                  .01
Net realized and unrealized gain/(loss) on investments(2). ..............            (1.38)                1.00
                                                                                    ------               ------
Net increase/(decrease) in net assets resulting
   from operations ......................................................            (1.37)                1.01
                                                                                    ------               ------
DIVIDENDS TO SHAREHOLDERS FROM:
Net investment income ...................................................            (0.01)                  --
Net realized capital gains. .............................................            (0.21)                  --
                                                                                    ------               ------
Net asset value, end of period. .........................................           $ 9.42               $11.01
                                                                                    ======               ======
Total investment return(3). .............................................           (12.77)%              10.10%
                                                                                    ======               ======
Ratios/Supplemental Data
   Net assets, end of period (000) ......................................           $1,828               $  598
   Ratio of expenses to average net assets(1)(4) ........................             1.15%                1.10%(5)
   Ratio of net investment income to average net assets(1). .............            (0.02)%                .61%(5)
   Portfolio turnover rate ..............................................           167.86%               21.80%(6)

<FN>
   *   Commencement of operations.
  **   Calculated  based on shares  outstanding on the first and last day of the
       period,  except for dividends and distributions,  if any, which are based
       on actual shares outstanding on the dates of distributions.
  (1)  Reflects waivers and reimbursements.
  (2)  The amount shown for a share outstanding  throughout the period is not in
       accord with the change in the aggregate  gains and losses in  investments
       during the period because of the timing of sales and  repurchases of Fund
       shares in relation to  fluctuating  net asset value during the respective
       periods.
  (3)  Total return is calculated assuming a purchase of shares on the first day
       and a sale of  shares  on the last day of the  period  reported  and will
       include  reinvestments  of dividends  and  distributions,  if any.  Total
       return is not annualized.
  (4)  Without the waiver of advisory 12b-1,  administration  and transfer agent
       fees and without the  reimbursement of certain  operating  expenses,  the
       ratio of expenses to average net assets  annualized  for the period ended
       August 31, 1997 and the year ended August 31, 1998 would have been 12.62%
       and 1.82%, respectively, for the Investor Class.
  (5)  Annualized. 
  (6)  Not annualzied.
</FN>
</TABLE>

INTRODUCTION
- --------------------------------------------------------------------------------

     RBB is an open-end  management  investment  company  incorporated under the
laws of the State of  Maryland  currently  operating  or  proposing  to  operate
seventeen separate investment portfolios.  The Shares offered by this Prospectus
represent  interests  in the  Boston  Partners  Mid  Cap  Value  Fund.  RBB  was
incorporated in Maryland on February 29, 1988.

                                       3
<PAGE>

INVESTMENT OBJECTIVES AND POLICIES
- --------------------------------------------------------------------------------
     The Fund's investment objectives are to provide long-term growth of capital
with  current  income as a  secondary  objective.  The Fund seeks to achieve its
objectives by investing,  under normal  market  conditions,  at least 65% of its
total  assets  in  a  diversified   portfolio  consisting  primarily  of  equity
securities  such as common  stocks of issuers  with a market  capitalization  of
between $200  million and $6 billion,  and  identified  by the Adviser as equity
securities that it believes possess value characteristics.

     The   Adviser   examines   various   factors  in   determining   the  value
characteristics  of such  issuers,  including  but not  limited to price to book
value  ratios and price to  earnings  ratios.  These value  characteristics  are
examined in the context of the issuer's  operating  and  financial  fundamentals
such as return on equity, earnings growth and cash flow.

     The Adviser selects  securities for the Fund based on a continuous study of
trends  in  industries  and  companies,  earnings  power  and  growth  and other
investment criteria.  In general, the Fund's investments are broadly diversified
over a number of industries and, as a matter of policy, the Fund will not invest
25% or more of its total assets in any one industry.

     The Fund may invest up to 20% of its total assets in  securities of foreign
issuers.  Investing in securities of foreign issuers involves considerations not
typically  associated  with  investing in securities of companies  organized and
operating in the United States. Foreign securities generally are denominated and
pay dividends or interest in foreign currencies.  The Fund may hold from time to
time various foreign  currencies  pending their investment in foreign securities
or their  conversion into U.S.  dollars.  The value of the assets of the Fund as
measured in U.S.  dollars may therefore be affected  favorably or unfavorably by
changes in exchange  rates.  There may be less  publicly  available  information
concerning  foreign  issuers  than is available  with  respect to U.S.  issuers.
Foreign  securities may not be registered with the U.S.  Securities and Exchange
Commission,  and  generally,  foreign  companies  are  not  subject  to  uniform
accounting,  auditing and financial reporting  requirements  comparable to those
applicable to U.S.  issuers.  See "Investment  Objectives and  Policies--Foreign
Securities" in the Statement of Additional Information.

     The Fund may invest the remainder of its total assets in equity  securities
of issuers with lower or higher  capitalizations;  derivative  securities;  debt
securities issued by U.S. banks,  corporations and other business  organizations
that are investment  grade  securities;  and debt securities  issued by the U.S.
Government or government agencies.

     In accordance with the above-mentioned  policies,  the Fund may also invest
in indexed securities,  repurchase  agreements,  reverse repurchase  agreements,
dollar rolls, financial futures contracts,  options on futures contracts and may
lend  portfolio  securities.  See  "Investment  Objectives  and Policies" in the
Statement of Additional Information.

     The Fund may invest in registered investment companies and investment funds
in foreign countries subject to the provisions of the Investment  Company Act of
1940, as amended (the "1940 Act") and as discussed in "Investment Objectives and
Policies" in the  Statement of  Additional  Information.  If the Fund invests in
such investment  companies,  the Fund will bear its  proportionate  share of the
costs incurred by such companies, including investment advisory fees.

     While the Adviser intends to fully invest the Fund's assets at all times in
accordance  with the  above-mentioned  policies,  the Fund reserves the right to
hold up to 100% of its assets,  as a temporary  defensive  measure,  in cash and
eligible U.S.  dollar-denominated  money market  instruments.  The Adviser would
determine when market conditions warrant temporary defensive measures.

     The Fund's  investment  objectives and the policies  described above may be
changed by RBB's Board of Directors  without the affirmative vote of the holders
of a majority of the outstanding Shares representing interests in the Fund.

INVESTMENT LIMITATIONS
- --------------------------------------------------------------------------------
     The  Fund may not  change  the  following  investment  limitations  without
shareholder approval. (A complete list of the investment limitations that cannot
be changed without such a vote of the shareholders is contained in the Statement
of Additional Information under "Investment Objectives and Policies.")

                                       4
<PAGE>

     The Fund may not:

         1.  Purchase the  securities of any one issuer,  other than  securities
     issued  or   guaranteed   by  the  U.S.   Government  or  its  agencies  or
     instrumentalities,  if  immediately  after and as a result of such purchase
     more than 5% of the value of the Fund's  total  assets would be invested in
     the securities of such issuer,  or more than 10% of the outstanding  voting
     securities of such issuer would be owned by the Fund, except that up to 25%
     of the value of the Fund's total assets may be invested  without  regard to
     such limitations.

         2. Purchase any securities  which would cause, at the time of purchase,
     25% or more of the value of the total  assets of the Fund to be invested in
     the obligations of issuers in any single  industry,  provided that there is
     no limitation with respect to investments in U.S. Government obligations.

         3. Borrow  money or issue senior  securities,  except that the Fund may
     borrow from banks and enter into reverse  repurchase  agreements and dollar
     rolls for temporary purposes in amounts up to one-third of the value of its
     total  assets  at the  time of  such  borrowing;  or  mortgage,  pledge  or
     hypothecate  any assets,  except in connection  with any such borrowing and
     then in amounts not in excess of one-third of the value of the Fund's total
     assets at the time of such borrowing. The Fund will not purchase securities
     while its aggregate  borrowings  (including reverse repurchase  agreements,
     dollar  rolls and  borrowings  from banks) are in excess of 5% of its total
     assets.  Securities held in escrow or separate  accounts in connection with
     the Fund's  investment  practices  are not  considered  to be borrowings or
     deemed to be pledged for purposes of this limitation.

     If a percentage  restriction under one of the Fund's investment policies or
restrictions  or the use of assets is  adhered to at the time a  transaction  is
effected, later changes in percentage resulting from changing values will not be
considered a violation  (except with respect to any restrictions  that may apply
to borrowings or senior securities issued by the Fund).

RISK FACTORS
- --------------------------------------------------------------------------------
     As with other mutual  funds,  there can be no assurance  that the Fund will
achieve  its  objective.  The net asset  value per share of Shares  representing
interests in the Fund will  fluctuate as the values of its portfolio  securities
change in response to changing conditions in the equity market. An investment in
the Fund is not intended to constitute a balanced investment program. Other risk
factors are discussed  above under  "Investment  Objectives and Policies" and in
the  Statement  of  Additional  Information  under  "Investment  Objectives  and
Polices."

EUROPEAN CURRENCY UNIFICATION

     Many European countries are about to adopt a single European currency,  the
euro.  On January 1, 1999,  the euro will become legal tender for all  countries
participating in the Economic and Monetary Union ("EMU"). A new European Central
Bank will be created to manage the monetary policy of the new unified region. On
the same date,  the exchange  rates will be  irrevocably  fixed  between the EMU
member countries.  National currencies will continue to circulate until they are
replaced by euro coins and bank notes by the middle of 2002.

     This change is likely to significantly  impact the European capital markets
in which the Fund may invest and may result in the Fund facing  additional risks
in pursuing its investment  objective.  These risks, which include,  but are not
limited  to,  uncertainty  as to  the  proper  tax  treatment  of  the  currency
conversion, volatility of currency exchange rates as a result of the conversion,
uncertainty  as to capital  market  reaction,  conversion  costs that may affect
issuer  profitability  and  creditworthiness,  and lack of participation by some
European  countries,  may increase the  volatility of the Fund's net asset value
per share.

YEAR 2000
- --------------------------------------------------------------------------------
     Like  other  mutual  funds,   financial  and  business   organizations  and
individuals  around  the  world,  the Fund could be  adversely  affected  if the
computer systems used by the Adviser and the Fund's other service providers,  or
persons with

                                       5
<PAGE>

whom they deal, do not properly process and calculate  date-related  information
and data from and after January 1, 2000.  This  possibility is commonly known as
the "Year 2000 Problem." The Year 2000 Problem could also hurt  companies  whose
securities  the Fund holds on securities  markets  generally.  The Fund has been
advised by the  Adviser,  the  Administrators  and the  Custodian  that they are
actively  taking  steps to address  the Year 2000  Problem  with  respect to the
computer  systems that they use and to obtain  assurances that comparable  steps
are being taken by the Fund's other major service providers.  While there can be
no assurance that the Fund's service providers will be Year 2000 compliant,  the
Fund's  service  providers  expect  that  their  plans to be  compliant  will be
achieved.

GENERAL

     Investment  methods  described in this Prospectus are among those which the
Fund has the power to utilize.  Some may be employed on a regular basis;  others
may not be used at all.  Accordingly,  reference  to any  particular  method  or
technique  carries no implication that it will be utilized or, if it is, that it
will be successful.

MANAGEMENT
- --------------------------------------------------------------------------------

BOARD OF DIRECTORS

     The  business  and  affairs  of RBB and the  Fund  are  managed  under  the
direction of RBB's Board of Directors.

INVESTMENT ADVISER

     Boston Partners Asset Management,  L.P.,  located at 28 State Street,  21st
Floor, Boston, Massachusetts 02109, serves as the Fund's investment adviser. The
Adviser  provides  investment  management  and investment  advisory  services to
investment  companies and other institutional  accounts that had aggregate total
assets under management as of October 31, 1998, in excess of $16.0 billion.  The
adviser  is  organized  as a Delaware  limited  partnership  whose sole  general
partner is Boston Partners, Inc., a Delaware corporation.

     Subject to the supervision  and direction of RBB's Board of Directors,  the
Adviser manages the Fund's  portfolio in accordance  with the Fund's  investment
objectives and policies,  makes investment decisions for the Fund, places orders
to purchase and sell securities, and employs professional portfolio managers and
securities  analysts who provide research services to the Fund. For its services
to the Fund,  the Adviser is paid a monthly  advisory  fee computed at an annual
rate of 0.80% of the Fund's  average daily net assets.  The Adviser has notified
RBB, however, that it intends to limit total Fund operating expenses to 1.00% of
the Fund's average daily net assets during the current fiscal year.

PORTFOLIO MANAGEMENT

     The day-to-day  portfolio  management of the Fund is the  responsibility of
Wayne J. Archambo who is a senior portfolio  manager of the Adviser and a member
of the Adviser's Equity Strategy Committee. Mr. Archambo oversees the investment
activities of the Adviser's $1.5 billion  mid-capitalization  activities as well
as $1.0 billion in small capitalization activities. Prior to joining the Adviser
in April 1995, Mr. Archambro was employed by The Boston Company Asset Management
from 1989  through  April 1995  where he was a senior  portfolio  manager  and a
member of the Firm's Equity Policy Committee. Mr. Archambro has over 16 years of
investment experience and is a Chartered Financial Analyst.

ADMINISTRATOR

     PFPC  Inc.  ("PFPC")  serves  as  administrator  to the Fund and  generally
assists the Fund in all aspects of its administration and operations,  including
matters relating to the maintenance of financial records and accounting. For its
services,  PFPC  receives  a fee  calculated  at an annual  rate of .125% of the
Fund's  average  daily net assets with a minimum  annual fee of $75,000  payable
monthly on a pro rata basis.

                                       6
<PAGE>

TRANSFER AGENT, DIVIDEND DISBURSING AGENT, AND CUSTODIAN

     PFPC Trust Company,  an indirect wholly-owned  subsidiary of PNC Bank Corp.
will succeed PNC Bank, National Association ("PNC Bank") as the Fund's custodian
pursuant to an assignment. PNC Bank will continue to provide certain services to
PFPCTrust  Company.  PFPC  serves as the  Fund's  transfer  agent  and  dividend
disbursing  agent.  The  principal  offices of PFPC are located at 400  Bellevue
Parkway,  Wilmington,  Delaware 19809. PFPC may enter into shareholder servicing
agreements  with  registered   broker-dealers   who  have  entered  into  dealer
agreements  with the  Distributor  ("Authorized  Dealers")  for the provision of
certain shareholder support services to customers of such Authorized Dealers who
are shareholders of the Fund. The services  provided and the fees payable by the
Fund for these services are described in the Statement of Additional Information
under "Investment Advisory, Distribution and Servicing Arrangements."

DISTRIBUTOR

     Provident Distributors, Inc. (the "Distributor"), with a principal business
address at Four Falls Corporate Center,  West Conshohocken,  Pennsylvania 19428,
acts as distributor  for the Shares  pursuant to a  distribution  agreement (the
"Distribution Agreement") with RBB on behalf of the Shares.

EXPENSES

     The  expenses  of the  Fund  are  deducted  from its  total  income  before
dividends  are  paid.  Any  general   expenses  of  RBB  that  are  not  readily
identifiable  as belonging to a particular  investment  portfolio of RBB will be
allocated  among all  investment  portfolios  of RBB based upon the relative net
assets of the investment portfolios. The Investor Class of the Fund pays its own
distribution fees, and may pay a different share than the Institutional Class of
other  expenses  (excluding  advisory and custodial  fees) if those expenses are
actually  incurred in a different amount by the Investor Class or if it receives
different services.

     The  Adviser  may  assume  expenses  of the Fund from time to time.  To the
extent any service  providers  assume  expense of the Fund,  such  assumption of
expenses will have the effect of lowering the Fund's  overall  expense ratio and
increasing its yield to investors.

DISTRIBUTION OF SHARES
- --------------------------------------------------------------------------------
     The Board of  Directors  of RBB has  approved  and  adopted a  Distribution
Agreement and Plan of Distribution  for the Shares (the "Plan") pursuant to Rule
12b-1 under the 1940 Act. Under the Plan, the Distributor is entitled to receive
from the Fund a  distribution  fee with respect to the shares,  which is accrued
daily and paid  monthly,  of up to 0.25% on an  annualized  basis of the average
daily net assets of the Shares. The actual amount of such compensation under the
Plan is agreed upon by RBB's Board of Directors  and by the  Distributor  in the
Distribution  Agreement.  The Distributor  may, in its discretion,  from time to
time waive voluntarily all or any portion of its distribution fee.

     Amounts  paid  to  the  Distributor  under  the  Plan  may be  used  by the
Distributor  to cover  expenses  that are related to (i) the sale of the Shares,
(ii) ongoing servicing and/or  maintenance of the accounts of Shareholders,  and
(iii)  sub-transfer  agency services,  subaccounting  services or administrative
services  related to the sale of the Shares,  all as set forth in the Plan.  The
Distributor may delegate some or all of these  functions to Service Agents.  See
"How to Purchase Shares -- Purchases Through Intermediaries."

     The Plan obligates the Fund,  during the period it is in effect,  to accrue
and pay to the  Distributor  on behalf of the Shares the fee agreed to under the
Distribution  Agreement.  Payments  under the Plan are not tied  exclusively  to
expenses  actually  incurred  by the  Distributor  and the  payments  may exceed
distribution expenses actually incurred.

PURCHASES THROUGH INTERMEDIARIES

     Shares  of the Fund  may be  available  through  certain  brokerage  firms,
financial institutions and other industry professionals (collectively,  "Service
Organizations").  Certain  features  of the  Shares,  such  as the  initial  and
subsequent investment

                                       7
<PAGE>

minimums and certain trading restrictions,  may be modified or waived by Service
Organizations.  Service  Organizations may impose  transaction or administrative
charges or other  direct  fees,  which  charges and fees would not be imposed if
Shares are  purchased  directly from the Fund.  Therefore,  a client or customer
should contact the Service Organization acting on his behalf concerning the fees
(if any)  charged in  connection  with a purchase  or  redemption  of Shares and
should read this  Prospectus  in light of the terms  governing his accounts with
the Service Organization. Service Organizations will be responsible for promptly
transmitting  client or customer  purchase and redemption  orders to the Fund in
accordance  with their  agreements  with the Fund and with clients or customers.
Service Organizations or, if applicable,  their designees that have entered into
agreements  with the Fund or its agent may enter  confirmed  purchase  orders on
behalf of clients and customers, with payment to follow no later than the Fund's
pricing on the following  Business Day. If payment is not received by such time,
the Service  Organization could be held liable for resulting fees or losses. The
Fund will be deemed to have  received  a  purchase  or  redemption  order when a
Service  Organization,  or, if applicable,  its authorized  designee,  accepts a
purchase or redemption order in good order.  Orders received by the Fund in good
order will be priced at the Fund's net asset value next computed  after they are
accepted by the Service Organization or its authorized designee.

     For administration,  subaccounting,  transfer agency and/or other services,
Boston   Partners,   the  Distributor  or  their   affiliates  may  pay  Service
Organizations and certain  recordkeeping  organizations a fee of up to .35% (the
"Service Fee") of the average annual value of accounts with the Fund  maintained
by such Service  Organizations or recordkeepers.  The Service Fee payable to any
one Service Organization is determined based upon a number of factors, including
the  nature  and  quality  of  services  provided,   the  operations  processing
requirements  of the  relationship  and the  standardized  fee  schedule  of the
Service Organization or recordkeeper.

     The Adviser,  the  Distributor or either of their  affiliates may, at their
own expense, provide promotional incentives for qualified recipients who support
the sale of Shares,  consisting  of  securities  dealers who have sold Shares or
others,  including  banks  and  other  financial  institutions,   under  special
arrangements.  Incentives may include opportunities to attend business meetings,
conferences, sales or training programs for recipients, employees or clients and
other  programs or events and may also include  opportunities  to participate in
advertising  or  sales  campaigns  and/or  shareholder   services  and  programs
regarding one or more Boston Partners Funds.  Travel, meals and lodging may also
be paid in connection  with these  promotional  activities.  In some  instances,
these   incentives   may  be  offered   only  to  certain   institutions   whose
representatives provide services in connection with the sale or expected sale of
significant amounts of Shares.

HOW TO PURCHASE SHARES
- --------------------------------------------------------------------------------

GENERAL

     Shares representing interests in the Fund are offered continuously for sale
by the  Distributor and may be purchased  without  imposition of a sales charge.
Shares may be purchased initially by completing the application included in this
Prospectus and forwarding the application to the Fund's  transfer  agent,  PFPC.
Purchases  of Shares may be  effected by wire to an account to be  specified  by
PFPC or by mailing a check or  Federal  Reserve  Draft,  payable to the order of
"The  Boston  Partners  Mid Cap  Value  Fund,"  c/o PFPC  Inc.,  P.O.  Box 8852,
Wilmington,  Delaware 19899-8852.  The name of the Fund, Boston Partners Mid Cap
Value Fund, must also appear on the check or Federal Reserve Draft. Shareholders
may not purchase  shares of the Boston  Partners Mid Cap Value Fund with a check
issued by a third party and endorsed over to the fund.  Federal  Reserve  Drafts
are  available  at  national  banks or any state  bank  which is a member of the
Federal Reserve System.  Initial investments in the Fund must be at least $2,500
and subsequent investments must be at least $100. The Fund reserves the right to
suspend the  offering  of Shares for a period of time or to reject any  purchase
order.

     Shares may be purchased on any  Business  Day. A "Business  Day" is any day
that the New York  Stock  Exchange,  Inc.  (the  "NYSE")  is open for  business.
Currently,  the NYSE is closed on weekends and New Year's Day, Dr. Martin Luther
King, Jr. Day,  Presidents' Day, Good Friday,  Memorial Day,  Independence  Day,
Labor Day,  Thanksgiving  Day and Christmas  Day and on the preceding  Friday or
subsequent Monday when one of these holidays falls on a Saturday or Sunday.

                                       8
<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>
                             
                       
   BOSTON PARTNERS MID CAP VALUE FUND     bp 
             (INVESTOR CLASS)             BOSTON PARTNERS ASSET MANAGEMENT, L.P.
                      
ACCOUNT APPLICATION   
Please Note: Do not use this form to open a retirement plan account. For an IRA
application or help with this Application, please call 1-888-261-4073.
                      
                (Please check the appropriate box(es) below.)
1.              / / Individual       / / Joint Tenant     / / Other  
Account         ________________________________________________________________
Registration:   Name          SOCIAL SECURITY NUMBER OR TAX ID# OF PRIMARY OWNER
                       
                ________________________________________________________________
                NAME OF JOINT OWNER        JOINT OWNER SOCIAL SECURITY NUMBER OR
                                           TAX ID#  

                For joint accounts, the account registrants will be joint
                tenants with right of survivorship and not tenants in common
                unless tenants in common or community property registrations are
                requested.


GIFT TO MINOR:  / / UNIFORM GIFTS/TRANSFER TO MINOR'S ACT

                ________________________________________________________________
                NAME OF ADULT CUSTODIAN (ONLY ONE PERMITTED)

                ________________________________________________________________
                NAME OF MINOR (ONLY ONE PERMITTED)

                ________________________________________________________________
                MINOR'S SOCIAL SECURITY NUMBER AND DATE OF BIRTH


CORPORATION,
PARTNERSHIP, 
TRUST OR 
OTHER ENTITY:
                ________________________________________________________________
                NAME OF CORPORATION, PARTNERSHIP,          NAME(S) OF TRUSTEE(S)
                OR OTHER

                ________________________________________________________________
                TAXPAYER IDENTIFICATION NUMBER

2.              ________________________________________________________________
Mailing         STREET OR P.O. BOX AND/OR APARTMENT NUMBER
Address:
                ________________________________________________________________
                CITY                      STATE                         ZIP CODE

                ________________________________________________________________
                DAY PHONE NUMBER                            EVENING PHONE NUMBER



3.              Minimum initial investment     Amount of investment $___________
Investment      of $100,000.
Information:
                Make the check payable to Boston Partners Mid Cap Value Fund.

                Shareholders may not purchase shares of this Fund with a check
                issued by a third party and endorsed over to the Fund.



DISTRIBUTION    NOTE:  Dividends and capital gains may be reinvested or paid by 
OPTIONS:        check. If no options are selected below, both dividends and 
                capital gains will be reinvested in additional Fund shares.

                DIVIDENDS / /   Pay by check / /   Reinvest / / 
                CAPITAL GAINS / /   Pay by check / /   Reinvest / /
SYSTEMATIC      To select this portion please fill out the information below:
WITHDRAWAL      Amount_________________________Startup Month____________________
PLAN:
                Frequency Options:  Annually / /   Monthly / /   Quarterly / /
<PAGE>
                --A minimum account value of $10,000 in a single account is
                  required to establish a Systematic Withdrawal Plan
                --Payments wil be made on or near the 25th of the month
                Please check one of the following options:
                  ____Please mail checks to Address of Record 
                      (Named in Section 2)
                  ____Please electronically credit my Bank of Record 
                      (Named in Section 5)

4.              To use this option, you must initial the appropriate line below.
Telephone       I authorize the Transfer Agent to accept instructions from any  
Redemption:     persons to redeem or exchange shares in my account(s) by        
                telephone in accordance with the procedures and conditions set  
                forth in the Prospectus.                                        
                
                ______________________  _________________ Redeem shares, and 
                  individual initial      joint initial   send the proceeds to
                                                          the address of record.

                ______________________  _________________ Exchange shares for
                 individual initial       joint initial   shares of The Boston 
                                                          Partners Large Cap 
                                                          Value Fund or Market
                                                          Neutral Fund.


5.
Automatic      The Automatic Investment Plan, which is available to shareholders
Investment     of the Fund, makes possible regularly scheduled purchases of Fund
Plan:          shares to allow dollar-cost averaging. The Fund's Transfer Agent 
               can arrange for an amount of money selected by you to be deducted
               from your checking account and used to purchase shares of the    
               Fund.                                                            
               
               Please debit $________ from my checking account (named below) on
               or about the 20th of the month. PLEASE ATTACH AN UNSIGNED, VOIDED
               CHECK. 

               / / Monthly / / Every Alternate Month / / Quarterly / / Other

BANK OF        _________________________________________________________________
RECORD:        BANK NAME                         STREET ADDRESS OR P.O. BOX

               _________________________________________________________________
               CITY                   STATE                        ZIP CODE

               _________________________________________________________________
               BANK ABA NUMBER                          BANK ACCOUNT NUMBER

6.
Signatures     The undersigned warrants that I (we) have full authority and, if
               a natural person, I (we) am (are) of legal age to purchase shares
               pursuant to this Account Application, and I (we) have received a
               current prospectus for the Fund in which I (we) am (are)
               investing. 
               Under the Interest and Dividend Tax Compliance Act of 1983, the
               Fund is required to have the following certification:
               Under penalties of perjury, I certify that:
               (1) The number shown on this form is my correct taxpayer
                   identification number (or I am waiting for a number to be
                   issued to me), and
               (2) I am not subject to backup withholding because (a) I am
                   exempt from backup withholding, or (b) I have not been
                   notified by the Internal Revenue Service that I am subject to
                   31% backup withholding as a result of a failure to report all
                   interest or dividends, or (c) the IRS has notified me that I
                   am no longer subject to backup withholding.
               NOTE: YOU MUST CROSS OUT ITEM (2) ABOVE IF YOU HAVE BEEN NOTIFIED
               BY THE IRS THAT YOU ARE CURRENTLY SUBJECT TO BACKUP WITHHOLDING
               BECAUSE YOU HAVE FAILED TO REPORT ALL INTEREST AND DIVIDENDS ON
               YOUR TAX RETURN. THE INTERNAL REVENUE SERVICE DOES NOT REQUIRE
               YOUR CONSENT TO ANY PROVISION OF THIS DOCUMENT OTHER THAN THE
               CERTIFICATION REQUIRED TO AUDIT BACKUP WITHHOLDING.

               _________________________________________________________________
               SIGNATURE OF APPLICANT                              DATE

               _________________________________________________________________
               PRINT NAME                                 TITLE (IF APPLICABLE)

               _________________________________________________________________
               SIGNATURE OF JOINT OWNER                            DATE

               _________________________________________________________________
               PRINT NAME                                 TITLE (IF APPLICABLE)


               (If you are signing for a corporation, you must indicate
               corporate office or title. If you wish additional signatories on
               the account, please include a corporate resolution. If signing as
               a fiduciary, you must indicate capacity.)

               For information on additional options, such as IRA Applications,
               rollover requests for qualified retirement plans, or for wire
               instructions, please call us at 1-888-261-4073.

               MAIL COMPLETED ACCOUNT APPLICATION AND CHECK TO:        
                            THE BOSTON PARTNERS MID CAP VALUE FUND             
                            C/O PFPC INC.                                      
                            P.O. BOX 8852                          
                            WILMINGTON, DE  19899-8852             

                            
<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>

     The price paid for Shares  purchased  is based on the net asset  value next
computed  after a purchase  order is  received  in good order by the Fund or its
agents. Orders received by the Fund or its agents prior to the close of the NYSE
(generally  4:00 p.m.  Eastern Time) are priced at that Business Day's net asset
value. Orders received by the Fund or its agents after the close of the NYSE are
priced at the net asset value next determined on the following  Business Day. In
those cases where an investor  pays for Shares by check,  the  purchase  will be
effected  at the net asset  value next  determined  after the Fund or its agents
receives the order and the completed application.

     Provided  that the  investment  is at least  $2,500,  an investor  may also
purchase Shares by having his bank or his broker wire Federal Funds to PFPC. The
Fund does not currently  impose a service charge for effecting  wire  transfers,
but reserves the right to do so in the future.  An investor's bank or broker may
impose a charge  for this  service.  In order to  ensure  prompt  receipt  of an
investor's Federal Funds wire for an initial investment, it is important that an
investor follows these steps:

     A. Telephone the Fund's transfer agent, PFPC, toll-free (888) 261-4073, and
provide PFPC with your name, address,  telephone number,  Social Security or Tax
Identification  Number, the Fund selected,  the amount being wired, and by which
bank. PFPC will then provide an investor with a Fund account  number.  Investors
with existing accounts should also notify PFPC prior to wiring funds.

     B. Instruct your bank or broker to wire the specified amount, together with
your assigned account number, to PFPC's account with PNC Bank:

                  PNC Bank, N.A.
                  Philadelphia, PA 19103
                  ABA NUMBER: 0310-0005-3
                  CREDITING ACCOUNT NUMBER: 86-1108-2507
                  FROM: (name of investor)
                  ACCOUNT NUMBER: (Investor's account number with the Fund)
                  FOR PURCHASE OF: Boston Partners Mid Cap Value Fund
                  AMOUNT: (amount to be invested)

     C. Fully complete and sign the application and mail it to the address shown
thereon. PFPC will not process purchases until it receives a fully completed and
signed application.

     For subsequent investments, an investor should follow steps A and B above.

AUTOMATIC INVESTING

     Additional  investments in Shares may be made  automatically by authorizing
the Fund's  transfer agent to withdraw  funds from your bank account.  Investors
desiring to participate in the Automatic  Investment Plan should call the Fund's
transfer agent, PFPC, at (888)261-4073 to obtain the appropriate forms.

RETIREMENT PLANS

     Shares may be purchased in conjunction with individual  retirement accounts
("IRAs") and  rollover  IRAs where PFPC Trust  Company  acts as  custodian.  For
further  information  as to  applications  and annual  fees,  contact the Fund's
transfer agent, PFPC, at (888) 261-4073. To determine whether the benefits of an
IRA are available and/or  appropriate,  a shareholder  should consult with a tax
adviser.

                                       9
<PAGE>

HOW TO REDEEM AND EXCHANGE SHARES
- --------------------------------------------------------------------------------

REDEMPTION BY MAIL

     Shareholders may redeem for cash some or all of their Shares of the Fund at
any time.  To do so, a written  request in proper form must be sent  directly to
Boston  Partners Mid Cap Value Fund, c/o PFPC Inc.,  P.O. Box 8852,  Wilmington,
Delaware 19899-8852. There is no charge for a redemption.

     A request for  redemption  must be signed by all persons in whose names the
Shares  are   registered.   Signatures  must  conform  exactly  to  the  account
registration.  If the proceeds of the redemption would exceed $10,000, or if the
proceeds are not to be paid to the record owner at the record address, or if the
shareholder is a corporation, partnership, trust or fiduciary, signature(s) must
be  guaranteed  according  to the  procedures  described  below under  "Exchange
Privilege."

     Generally,  a properly signed written  request with any required  signature
guarantee  is all that is required  for a  redemption.  In some cases,  however,
other  documents may be  necessary.  In the case of  shareholders  holding share
certificates,  the certificates for the shares being redeemed must accompany the
redemption  request.  Additional  documentary  evidence  of  authority  is  also
required by the Fund's transfer agent in the event  redemption is requested by a
corporation, partnership, trust, fiduciary, executor or administrator.

SYSTEMATIC WITHDRAWAL PLAN

     If your  account  has a value  of at least  $10,000,  you may  establish  a
Systematic  Withdrawal Plan and receive regular periodic payments.  A request to
establish a Systematic  Withdrawal  Plan must be submitted in writing to PFPC at
P.O. Box 8852, Wilmington,  Delaware 19899-8852. Each withdrawal redemption will
be  processed  on or about the 25th of the month and mailed as soon as  possible
thereafter.  There are no service  charges for  maintenance;  the minimum amount
that you may withdraw  each period is $100.  (This is merely the minimum  amount
allowed and should not be mistaken  for a  recommended  amount.) The holder of a
Systematic  Withdrawal Plan will have any income dividends and any capital gains
distributions  reinvested in full and fractional  shares at net asset value.  To
provide  funds  for  payment,  Shares  will be  redeemed  in such  amount  as is
necessary  at the  redemption  price,  which is net asset value next  determined
after the  Fund's  receipt of a  redemption  request.  Redemption  of Shares may
reduce or possibly exhaust the Shares in your account, particularly in the event
of a  market  decline.  As  with  other  redemptions,  a  redemption  to  make a
withdrawal  payment is a sale for federal  income tax  purposes.  Payments  made
pursuant to a Systematic Withdrawal Plan cannot be considered as actual yield or
income since part of such payments may be a return of capital.

     You will ordinarily not be allowed to make  additional  investments of less
than the aggregate  annual  withdrawals  under the  Systematic  Withdrawal  Plan
during the time you have the plan in effect and,  while a Systematic  Withdrawal
Plan is in effect,  you may not make  periodic  investments  under the Automatic
Investment Plan. You will receive a confirmation of each transaction showing the
sources of the payment and the Share and cash  balance  remaining  in your plan.
The plan may be terminated on written  notice by the  shareholder or by the Fund
and will terminate  automatically if all Shares are liquidated or withdrawn from
the account or upon the death or incapacity of the  shareholder.  You may change
the amount and  schedule  of  withdrawal  payments or suspend  such  payments by
giving written notice to the Fund's  transfer agent at least seven Business Days
prior to the end of the month preceding a scheduled payment.

INVOLUNTARY REDEMPTION

     The Fund reserves the right to redeem a  shareholder's  account at any time
the  net  asset  value  of the  account  falls  below  $500 as the  result  of a
redemption or an exchange request. Shareholders will be notified in writing that
the value of their account is less than $500 and will be allowed 30 days to make
additional investments before the redemption is processed.

PAYMENT OF REDEMPTION PROCEEDS

     In all cases,  the  redemption  price is the net asset value per share next
determined  after the request for  redemption  is received in proper form by the
Fund or its agents.  Payment for Shares  redeemed is made by check mailed within
seven

                                       10
<PAGE>

days after  acceptance  by the Fund or its agents of the  request  and any other
necessary  documents in proper order. Such payment may be postponed or the right
of  redemption  suspended  as  permitted  by the 1940 Act.  If the  Shares to be
redeemed have been recently  purchased by check,  the Fund's  transfer agent may
delay  mailing  a  redemption  check,  which  may be a period  of up to 15 days,
pending a determination  that the check has cleared.  The Fund has elected to be
governed by Rule 18f-1 under the 1940 Act so that it is  obligated to redeem its
shares  solely in cash up to the lesser of $250,000 or 1% of its net asset value
during any 90-day period for any one shareholder of a portfolio.

EXCHANGE PRIVILEGE

     The exchange  privilege is available to shareholders  residing in any state
in which the Shares  being  acquired  may be legally  sold.  A  shareholder  may
exchange  Shares of the Fund for Investor  Shares of any other  Boston  Partners
Fund  RBB  subject  to the  restrictions  described  under  "Exchange  Privilege
Limitations."  Such  exchange  will be  effected  at the net asset  value of the
exchanged  Fund  and the  net  asset  value  of the  Fund  being  acquired  next
determined after receipt of a request for an exchange by the Fund or its agents.
An exchange of Shares will be treated as a sale for federal income tax purposes.
See  "Taxes." A  shareholder  wishing to make an exchange may do so by sending a
written request to PFPC.

     If the exchanging shareholder does not currently own Investor Shares of the
Fund into which he would like to  exchange,  a new account  will be  established
with the same  registration,  dividend  and capital  gain options as the account
from which shares are exchanged,  unless  otherwise  specified in writing by the
shareholder  with  all  signatures  guaranteed.  A  signature  guarantee  may be
obtained from a domestic bank or trust company,  broker, dealer, clearing agency
or savings association who are participants in a medallion program recognized by
the Securities Transfer Association. The three recognized medallion programs are
Securities Transfer Agents Medallion Program (STAMP),  Stock Exchanges Medallion
Program (SEMP) and New York Stock Exchange,  Inc.  Medallion  Signature  Program
(MSP).  Signature  guarantees  that are not part of these  programs  will not be
accepted.  The exchange  privilege may be modified or terminated at any time, or
from time to time, by RBB, upon 60 days' written notice to shareholders.

     If an exchange is to a new account in the acquired  Fund,  the dollar value
of Investor  Shares  acquired must equal or exceed the Fund's  minimum for a new
account;  if to an existing account,  the dollar value must equal or exceed that
Fund's  minimum for  subsequent  investments.  If any amount remains in the Fund
from which the  exchange  is being  made,  such  amount  must not drop below the
minimum account value required by the Fund.

EXCHANGE PRIVILEGE LIMITATIONS

     The Fund's exchange privilege is not intended to afford  shareholders a way
to speculate on  short-term  movements in the market.  Accordingly,  in order to
prevent excessive use of the exchange privilege that may potentially disrupt the
management  of  the  Funds  and  increase   transactions  costs,  the  Fund  has
established a policy of limiting excessive exchange activity.

     Shareholders are entitled to six (6) exchange redemptions (at least 30 days
apart)  from the Fund  during any  twelve-month  period.  Notwithstanding  these
limitations,  the  Fund  reserves  the  right to  reject  any  purchase  request
(including  purchases by exchange)  that is deemed to be disruptive to efficient
portfolio management.

TELEPHONE TRANSACTIONS

     In order to request an exchange or redemption  by telephone,  a shareholder
must  have  completed  and  returned  an  account  application   containing  the
appropriate telephone election. To add a telephone option to an existing account
that previously did not provide for this option, a Telephone  Authorization Form
must be filed with PFPC.  This form is available  from PFPC.  Once this election
has been made, the  shareholder  may simply contact PFPC by telephone to request
an exchange or redemption by calling (888) 261-4073.  Neither RBB, the Fund, the
Distributor,  the  Administrator nor any other Fund agent will be liable for any
loss,  liability,  cost or expense for  following  RBB's  telephone  transaction
procedures  described  below  or  for  following  instructions  communicated  by
telephone that they reasonably believe to be genuine.

     RBB's telephone transaction  procedures include the following measures: (1)
requiring the appropriate  telephone  transaction privilege forms; (2) requiring
the caller to provide  the names of the account  owners,  the  account's  social
security

                                       11
<PAGE>

number  and name of the  Fund,  all of  which  must  match  RBB's  records;  (3)
requiring RBB's service representative to complete a telephone transaction form,
listing  all of the above  caller  identification  information;  (4)  permitting
exchanges only if the two account  registrations  are  identical;  (5) requiring
that  redemption  proceeds be sent only by check to the account owners of record
at the  address of  record,  or by wire only to the owners of record at the bank
account  of  record;  (6)  sending a  written  confirmation  for each  telephone
transaction  to the owners of record at the  address of record  within  five (5)
Business Days of the call; and (7) maintaining  tapes of telephone  transactions
for six months, if the Fund elects to record shareholder telephone transactions.
For  accounts  held of record by  broker-dealers  (other than the  Distributor),
financial  institutions,   securities  dealers,  financial  planners  and  other
industry  professionals,  additional  documentation or information regarding the
scope of a caller's authority is required.  Finally, for telephone  transactions
in accounts held jointly, additional information regarding other account holders
is required. Telephone transactions will not be permitted in connection with IRA
or other  retirement  plan accounts or by an  attorney-in-fact  under a power of
attorney.

NET ASSET VALUE
- --------------------------------------------------------------------------------
     The net asset  value for each class of a fund is  calculated  by adding the
value of the  proportionate  interest of the class in a fund's cash,  securities
and other  assets,  deducting  actual and accrued  liabilities  of the class and
dividing the result by the number of  outstanding  shares of the class.  The net
asset value of each class is calculated  independently  of each other class. The
net asset values are calculated as of the close of regular  trading on the NYSE,
generally 4:00 p.m. Eastern time on each Business Day.

     Valuation of securities held by the Fund is as follows:  securities  traded
on a national  securities  exchange or on the NASDAQ  National Market System are
valued at the last reported sale price that day; securities traded on a national
securities exchange or on the NASDAQ National Market System for which there were
no sales on that day and securities traded on other over-the-counter markets for
which market  quotations are readily available are valued at the mean of the bid
and asked prices;  and  securities  for which market  quotations are not readily
available  are valued at fair  market  value as  determined  in good faith by or
under the  direction of RBB's Board of Directors.  The amortized  cost method of
valuation may also be used with respect to debt  obligations  with sixty days or
less remaining to maturity.

     With the approval of RBB's Board of  Directors,  the Fund may use a pricing
service,  bank or broker-dealer  experienced in such matters to value the Fund's
securities. A more detailed discussion of net asset value and security valuation
is contained in the Statement of Additional Information.

DIVIDENDS AND DISTRIBUTIONS
- --------------------------------------------------------------------------------
     The Fund will distribute substantially all of the net investment income and
net realized capital gains, if any, of the Fund to the Fund's shareholders.  All
distributions  are  reinvested  in the form of  additional  full and  fractional
Shares unless a shareholder elects otherwise.

     The  Fund  will  declare  and pay  dividends  from  net  investment  income
annually,  and  pays  them in the  calendar  year in which  they  are  declared,
generally in December.  Net realized  capital gains  (including  net  short-term
capital gains), if any, will be distributed at least annually.

TAXES
- --------------------------------------------------------------------------------
     The  following  discussion is only a brief summary of some of the important
tax considerations  generally affecting the Fund and its shareholders and is not
intended as a substitute for careful tax planning. Accordingly, investors in the
Fund should consult their tax advisers with specific  reference to their own tax
situation.

                                       12
<PAGE>

     The Fund will elect to be taxed as a  regulated  investment  company  under
Subchapter M of the Internal  Revenue Code of 1986,  as amended.  So long as the
Fund qualifies for this tax treatment, it will be relieved of federal income tax
on amounts  distributed to  shareholders,  but  shareholders,  unless  otherwise
exempt, will pay income or capital gains taxes on amounts so distributed (except
distributions  that are  treated as a return of capital)  regardless  of whether
such distributions are paid in cash or reinvested in additional shares.

     Distributions  out of the "net capital  gain" (the excess of net  long-term
capital  gain over net  short-term  capital  loss),  if any, of the Fund will be
taxed to shareholders as long-term capital gain regardless of the length of time
a shareholder has held his Shares,  whether such gain was reflected in the price
paid for the Shares,  or whether  such gain was  attributable  to bonds  bearing
tax-exempt interest.  All other  distributions,  to the extent they are taxable,
are taxed to shareholders as ordinary income.

     RBB will send written  notices to shareholders  annually  regarding the tax
status of distributions made by the Fund.  Dividends declared in December of any
year payable to  shareholders of record on a specified date in such a month will
be deemed to have been  received by the  shareholders  on December 31,  provided
such dividends are paid during  January of the following  year. The Fund intends
to make  sufficient  actual  or  deemed  distributions  prior to the end of each
calendar year to avoid liability for federal excise tax.

     Investors  should be careful to  consider  the tax  implications  of buying
shares just prior to a distribution.  The price of shares purchased at that time
will  reflect  the  amount  of the  forthcoming  distribution.  Those  investors
purchasing shares just prior to a distribution will nevertheless be taxed on the
entire amount of the  distribution  received,  although the  distribution is, in
effect, a return of capital.

     Shareholders  who exchange  shares  representing  interests in one Fund for
shares  representing  interests in another Fund will generally recognize capital
gain or loss for federal income tax purposes.

     Shareholders  who are  nonresident  alien  individuals,  foreign  trusts or
estates,  foreign  corporations  or  foreign  partnerships  may  be  subject  to
different U.S. federal income tax treatment.

MULTI-CLASS STRUCTURE
- --------------------------------------------------------------------------------
     The Fund offers one other class of shares,  Institutional  Shares, which is
offered directly to institutional  investors pursuant to a separate  prospectus.
Shares of each class  represent  equal pro rata interests in the Fund and accrue
dividends and calculate net asset value and  performance  quotations in the same
manner. The Fund will quote performance of Institutional  Shares separately from
Investor Shares.  Because of different expenses paid by the Investor Shares, the
total return on such shares can be expected,  at any time, to be different  than
the total return on Institutional Shares.  Information concerning  Institutional
Shares may be obtained by calling the Fund at (888) 261-4073.

DESCRIPTION OF SHARES
- --------------------------------------------------------------------------------
     RBB has authorized  capital of thirty billion shares of Common Stock, $.001
par value per share,  of which 18.326  billion  shares are currently  classified
into 97 different  classes of Common Stock.  See  "Description of Shares" in the
Statement of Additional Information.

     THIS  PROSPECTUS AND THE STATEMENT OF ADDITIONAL  INFORMATION  INCORPORATED
HEREIN RELATE  PRIMARILY TO THE BOSTON  PARTNERS MID CAP VALUE FUND AND DESCRIBE
ONLY THE  INVESTMENT  OBJECTIVES AND POLICIES,  OPERATIONS,  CONTRACTS AND OTHER
MATTERS RELATING TO THE BOSTON PARTNERS MID CAP VALUE FUND.

     Each  share  that   represents  an  interest  in  the  Fund  has  an  equal
proportionate interest in the assets belonging to the Fund with each other share
that  represents  an  interest  in the Fund,  even where a share has a different
class designation

                                       13
<PAGE>


than another share  representing  an interest in that  portfolio.  Shares of the
Fund do not have  preemptive  or conversion  rights.  When issued for payment as
described in this Prospectus, Shares will be fully paid and non-assessable.

     RBB  currently  does not intend to hold  annual  meetings  of  shareholders
except  as  required  by the 1940 Act or other  applicable  law.  The law  under
certain circumstances provides shareholders with the right to call for a meeting
of shareholders to consider the removal of one or more directors.  To the extent
required by law, RBB will assist in shareholder communication in such matters.

     Holders of Shares of the Fund will vote in the  aggregate  and not by class
on all matters, except where otherwise required by law. Further, shareholders of
all investment portfolios of RBB will vote in the aggregate and not by portfolio
except as otherwise required by law or when RBB's Board of Directors  determines
that the matter to be voted upon affects only the interests of the  shareholders
of  a  particular  investment  portfolio.   (See  the  Statement  of  Additional
Information under "Additional  Information  Concerning Fund Shares" for examples
when the  1940  Act  requires  voting  by  investment  portfolio  or by  class.)
Shareholders  of the Fund are  entitled  to one vote for each  full  share  held
(irrespective of class or portfolio) and fractional votes for fractional  shares
held.  Voting rights are not cumulative  and,  accordingly,  the holders of more
than 50% of the  aggregate  shares of Common  Stock of the Fund may elect all of
the directors.

     As of November 16, 1998, to the Fund's knowledge,  no person held of record
or beneficially 25% or more of the outstanding shares of all classes of RBB.

OTHER INFORMATION
- --------------------------------------------------------------------------------
REPORTS AND INQUIRIES

     Shareholders  will receive  unaudited  semi-annual  reports  describing the
Fund's  investment   operations  and  annual  financial  statements  audited  by
independent accountants. Shareholder inquiries should be addressed to PFPC Inc.,
the Fund's transfer agent, Bellevue Park Corporate Center, 400 Bellevue Parkway,
Wilmington, Delaware 19809, toll-free (888) 261-4073.

SHARE CERTIFICATES

     In  the  interest  of  economy  and  convenience,   physical   certificates
representing shares in the Fund are not normally issued.

HISTORICAL PERFORMANCE INFORMATION

     For the period  from  commencement  of  operations  (June 2, 1997)  through
August 31, 1998,  the total return (not  annualized)  for the Investor  Class of
Shares of the Fund was as follows:

     Unannualized investment returns for the period ended August 31, 1998

                                                                         Since
                                                                       Inception
                                                                       ---------
         Boston Partners Mid Cap Value Fund
           (Investor Shares) .....................................       (3.96)%

     The total return  assumes the  reinvestment  of all  dividends  and capital
gains and reflects investment advisory fee waivers and expense reimbursements in
effect. Without these waivers and expense reimbursements, the Fund's performance
would have been lower.  Of course,  past  performance  is no guarantee of future
results.  Investment return and principal value will fluctuate,  so that Shares,
when  redeemed,  may be worth  more or less  than the  original  cost.  For more
information on performance,  see  "Performance  Information" in the Statement of
Additional Information.

     The table below  presents the Composite  performance  history of certain of
the  Adviser's  managed  accounts on an  annualized  basis for the period  ended
August 31, 1998.  The  Composite is  comprised  of the  Adviser's  institutional
accounts  and other  privately  managed  accounts  with  investment  objectives,
policies and strategies substantially similar to those of

                                       14
<PAGE>

the Fund,  although the accounts have longer  operating  histories than the Fund
which  commenced   operations  on  June  2,  1997.  The  Composite   performance
information  includes the  reinvestment of dividends  received in the underlying
securities and reflects investment advisory fees. The privately managed accounts
in the Composite  are only  available to the  Adviser's  institutional  advisory
clients.  The past  performance  of the funds and  accounts  that  comprise  the
Composite is not indicative of or a substitute for the future performance of the
Fund. These accounts have lower  investment  advisory fees than the Fund and the
Composite  performance  figures  would  have been lower if subject to the higher
fees and expenses  incurred by the Fund.  These private accounts are not subject
to the same  investment  limitations,  diversification  requirements  and  other
restrictions  which are  imposed  upon  mutual  funds under the 1940 Act and the
Internal  Revenue  Code,  which,  if imposed,  may have  adversely  affected the
performance  results of the Composite.  Listed below the performance history for
the Composite is the  performance  history for a comparative  index comprised of
securities  similar to those in which  accounts  contained in the  Composite are
invested.

     Annualized investment returns for the period ended August 31, 1998

                                                       Since             Since
                                                     One Year          Inception
                                                     --------          ---------
     Composite Performance .......................   (12.77)%          (3.19)%*
     Russell 2500 Index. .........................   (16.84)%          (5.74)%
                                              
* The Adviser commenced managing these accounts on June 2, 1997.

     The Russell 2500 Index  represents the largest 3000 companies  domiciled in
the United  States minus the largest 500  companies as  determined by the market
value of such companies.

FUTURE PERFORMANCE INFORMATION

     From  time to time,  the  Fund may  advertise  its  performance,  including
comparisons  to other  mutual funds with similar  investment  objectives  and to
stock or other relevant indices.  All such  advertisements will show the average
annual total return over one, five and ten year periods or, if such periods have
not yet elapsed,  shorter  periods  corresponding  to the life of the Fund. Such
total  return  quotations  will be computed by finding  the  compounded  average
annual total  return for each time period that would equate the assumed  initial
investment of $1,000 to the ending redeemable value, net of fees, according to a
required standardized  calculation.  The standard calculation is required by the
SEC to provide consistency and comparability in investment company  advertising.
The Fund may also from time to time  include in such  advertising  an  aggregate
total return figure or a total return figure that is not calculated according to
the  standardized  formula  in order  to  compare  more  accurately  the  Fund's
performance with other measures of investment  return.  For example,  the Fund's
total return may be compared with data published by Lipper Analytical  Services,
Inc., CDA  Investment  Technologies,  Inc. or  Weisenberger  Investment  Company
Service,  or  with  the  performance  of the  Russell  2500  Index.  Performance
information  may also include  evaluation of the Fund by  nationally  recognized
ranking services and information as reported in financial  publications  such as
Business  Week,  Fortune,   Institutional  Investor,  Money  Magazine,   Forbes,
Barron's,  The Wall  Street  Journal,  The New York  Times,  or other  national,
regional or local publications.  All advertisements  containing performance data
will include a legend  disclosing  that such  performance  data  represents past
performance and that the investment  return and principal value of an investment
will fluctuate so that an investor's Shares, when redeemed, may be worth more or
less than their original cost.

                                       15
<PAGE>

NO  PERSON  HAS  BEEN   AUTHORIZED   TO  GIVE  ANY   INFORMATION   OR  MAKE  ANY
REPRESENTATIONS  NOT  CONTAINED  IN THIS  PROSPECTUS  OR IN RBB'S  STATEMENT  OF
ADDITIONAL INFORMATION  INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE
OFFERING MADE BY THIS  PROSPECTUS  AND, IF GIVEN OR MADE,  SUCH  REPRESENTATIONS
MUST NOT BE RELIED UPON AS HAVING  BEEN  AUTHORIZED  BY RBB OR ITS  DISTRIBUTOR.
THIS  PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY RBB OR BY THE DISTRIBUTOR IN
ANY JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY BE MADE.

                               -------------------
                                TABLE OF CONTENTS
                                                                            PAGE
                                                                            ----
EXPENSETABLE ..........................................................        2
FINANCIAL HIGHLIGHTS ..................................................        2
INTRODUCTION ..........................................................        3
INVESTMENT OBJECTIVES AND POLICIES ....................................        4
INVESTMENT LIMITATIONS ................................................        4
RISK FACTORS ..........................................................        5
YEAR 2000 .............................................................        5
MANAGEMENT ............................................................        6
DISTRIBUTION OF SHARES ................................................        7
HOW TO PURCHASE SHARES ................................................        8
HOW TO REDEEM AND EXCHANGE SHARES .....................................       10
NET ASSET VALUE .......................................................       12
DIVIDENDS AND DISTRIBUTIONS ...........................................       12
TAXES .................................................................       12
MULTI-CLASS STRUCTURE .................................................       13
DESCRIPTION OF SHARES .................................................       13
OTHER INFORMATION .....................................................       14

INVESTMENT ADVISER
Boston Partners Asset Management, L.P.
Boston, Massachusetts

CUSTODIAN
PFPC Trust Company
Wilmington, Delaware

TRANSFER AGENT AND ADMINISTRATOR
PFPC Inc.
Wilmington, Delaware

DISTRIBUTOR
Provident Distributors, Inc.
West Conshohocken, Pennsylvania

COUNSEL
Drinker Biddle & Reath LLP
Philadelphia, Pennsylvania

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers L.L.P.
Philadelphia, Pennsylvania

[LOGO GRAPHIC OMITTED]

<PAGE>
PROSPECTUS
DECEMBER 29, 1998
                                 BOSTON PARTNERS
                                    BOND FUND
                             (INSTITUTIONAL SHARES)

bp
BOSTON PARTNERS ASSET MANAGEMENT, L.P.
[LOGO GRAPHIC OMITTED]


<PAGE>

                            BOSTON PARTNERS BOND FUND
                              (INSTITUTIONAL CLASS)
                                       OF
                               THE RBB FUND, INC.

     Boston  Partners Bond Fund (the "Fund") is an  investment  portfolio of The
RBB Fund, Inc. ("RBB"), an open-end management investment company. The shares of
the  Institutional  Class  ("Shares")  offered  by  this  Prospectus   represent
interests in the Fund.  The  investment  objectives  of the Fund are to maximize
total  return  by  investing   principally  in  investment  grade  fixed  income
securities, and secondarily to seek current income.

     This Prospectus contains  information that a prospective  investor needs to
know before  investing.  Please  keep it for future  reference.  A Statement  of
Additional  Information,  dated  December  29,  1998,  has been  filed  with the
Securities  and Exchange  Commission  and is  incorporated  by reference in this
Prospectus.  It may be obtained  free of charge  from the Fund by calling  (888)
261-4073.  The  Prospectus  and the  Statement  of  Additional  Information  are
available for reference,  along with other related material, on the SEC Internet
Web Site (http://www.sec.gov).

SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY PNC BANK,  NATIONAL  ASSOCIATION,  PFPC  TRUST  COMPANY OR ANY OTHER BANK AND
SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT  INSURANCE  CORPORATION,
THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY. INVESTMENTS IN SHARES OF THE FUND
INVOLVE INVESTMENT RISKS, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.

- --------------------------------------------------------------------------------
THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THIS
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------

PROSPECTUS                                                     December 29, 1998

<PAGE>

EXPENSE TABLE
- --------------------------------------------------------------------------------
     The following  table  illustrates  annual  operating  expenses  incurred by
Institutional shares of the Fund (after fee waivers and expense  reimbursements)
for the fiscal period ended August 31, 1998 as a percentage of average daily net
assets. An example based on the summary is also shown.

ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)
     Management Fees (after waivers)* .................................   0.00%

     12b-1 Fees .......................................................   0.00%

     Other Expenses (after waivers) ...................................   0.60%
                                                                          ----
   Total Fund Operating Expenses (after waivers)* .....................   0.60%
                                                                          ====

* In the absence of fee waivers,  Management Fees would be .40%,  Other Expenses
would be 2.07% and Total Fund Operating Expenses would be 2.47%.

EXAMPLE

     An investor would pay the following  expenses on a $1,000 investment in the
Fund, assuming (1) a 5% annual return and (2) redemption at the end of each time
period:
                                         ONE       THREE      FIVE         TEN
                                        YEAR       YEARS      YEARS       YEARS
                                        ----       -----      -----       -----
     Boston Partners Bond Fund ........   $6        $19        $33         $75

         The Fee Table is designed to assist an  investor in  understanding  the
various  costs and expenses  that an investor in the Fund will bear  directly or
indirectly.  (For more complete  descriptions of the various costs and expenses,
see  "Management"   below.)  The  Fee  Table  reflects  a  voluntary  waiver  of
"Management  Fees" and  administrative  services  fees for the  Fund,  which are
expected to be in effect during the current fiscal period.  However, the Adviser
and  Administrative  Services Agent are under no obligation with respect to such
waivers and there can be no assurance that any future waivers of Management fees
or administrative  services fees will not vary from the figures reflected in the
Fee Table.

     The Example in the Fee Table assumes that all  dividends and  distributions
are  reinvested  and  that the  amounts  listed  under  "Annual  Fund  Operating
Expenses"  remain  the  same in the  years  shown.  THE  EXAMPLE  SHOULD  NOT BE
CONSIDERED  A  REPRESENTATION  OF FUTURE  EXPENSES  AND ACTUAL  EXPENSES  MAY BE
GREATER OR LESS THAN THOSE SHOWN.

FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
     The "Financial  Highlights"  presented  below set forth certain  investment
results  for  shares  of the  Institutional  Class of the  Fund  for the  period
indicated.  Shares of the Institutional  Class were first issued on December 30,
1997.  The financial  data included in this table should be read in  conjunction
with the financial  statements and notes thereto and the  unqualified  report of
PricewaterhouseCoopers   LLP   ("PricewaterhouseCoopers"),   RBB's   independent
accountant, which are incorporated by reference into the Statement of Additional
Information.  Further  information  about the  performance of the  Institutional
Class of the Fund is available in the Annual  Report to  Shareholders.  Both the
Statement of Additional Information and the Annual Report to Shareholders may be
obtained from the Fund free of charge by calling the telephone  number on page 1
of the prospectus.

                                       2
<PAGE>

                            BOSTON PARTNERS BOND FUND
         (FOR AN INSTITUTIONAL SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

                                                                FOR THE PERIOD
                                                              DECEMBER 30, 1997*
                                                              THROUGH AUGUST 31,
                                                                     1998
                                                              ------------------
Per Share Operating Performance**
Net asset value, beginning of period ..........................     $ 10.00
                                                                    -------
Net investment income (1) .....................................        0.78
Net realized and unrealized gain/(loss) on investments(2) .....       (0.31)
                                                                    -------
Net increase in net assets resulting from operations ..........        0.47
                                                                    -------
DIVIDENDS TO SHAREHOLDERS FROM:
Net investment income .........................................       (0.39)
Net realized capital gains ....................................          --
                                                                    -------
Net asset value, end of period ................................     $ 10.08
                                                                    =======
Total investment return(3) ....................................        4.79%
                                                                    =======
Ratios/Supplemental Data
   Net assets, end of period (000) ............................     $15,509
   Ratio of expenses to average net assets***(1)(4) ...........        0.60%
   Ratio of net investment income to average net assets***(1) .        6.06%
   Portfolio turnover rate****. ...............................       45.27%

     * Commencement of operations.
    ** Calculated  based on shares  outstanding on the first and last day of the
       period,  except for dividends and distributions,  if any, which are based
       on actual shares outstanding on the dates of distributions.
   *** Annualized.
  **** Not annualized.
   (1) Reflects waivers and reimbursements.
   (2) The amount shown for a share outstanding  throughout the period is not in
       accord with the change in the aggregate  gains and losses in  investments
       during the period because of the timing of sales and  repurchases of Fund
       shares in relation to fluctuating net asset value during the period.  
   (3) Total return is calculated assuming a purchase of shares on the first day
       and a sale of  shares  on the last day of the  period  reported  and will
       include  reinvestments  of dividends  and  distributions,  if any.  Total
       return is not annualized.
   (4) Until May 29, 1998, the Institutional  Class of the Fund paid .03% of its
       average  daily net assets to the  Fund's  previous  Distributor  in 12b-1
       fees. From May 29, 1998 through August 31, 1998, the Institutional  Class
       of  the  Fund  paid  .03%  of  its  average   daily  net  assets  to  the
       Administrative  Services  Agent pursuant to the  Administrative  Services
       Plan for Institutional  shares, in lieu of 12b-1 fees. Without the waiver
       of advisory,  administrative services, 12b-1, administration and transfer
       agent fees and without the reimbursement of certain  operating  expenses,
       the ratio of  expenses to average  net assets  annualized  for the period
       ended August 31, 1998 would have been 2.47% for the Institutional Class.

                                       3
<PAGE>

INTRODUCTION
- --------------------------------------------------------------------------------
     RBB is an open-end  management  investment  company  incorporated under the
laws of the State of  Maryland  currently  operating  or  proposing  to  operate
seventeen separate investment portfolios.  The Shares offered by this Prospectus
represent  interests in the Boston  Partners Bond Fund. RBB was  incorporated in
Maryland on February 29, 1988.

INVESTMENT OBJECTIVES AND POLICIES
- --------------------------------------------------------------------------------
     The  investment  objectives  of the Fund are to  maximize  total  return by
investing   principally  in  investment  grade  fixed  income  securities,   and
secondarily to seek current income.

     The Fund will invest during  normal  market  conditions at least 75% of its
total assets in bonds,  including corporate debt obligations and mortgage-backed
and   asset-backed   securities   (collectively,    "Debt   Securities")   rated
investment-grade  or better at the time of purchase by Standard & Poor's ("S&P")
or Moody's Investors Service,  Inc.  ("Moody's") or which are similarly rated by
another  nationally   recognized   statistical  rating   organization   ("Rating
Organization")  (including Fitch IBCA, Duff & Phelps, and Thomson BankWatch), or
are unrated but deemed by Boston Partners Asset  Management L.P. (the "Adviser")
to be comparable in quality to instruments  so rated.  The Fund may invest up to
25% of its total assets in Debt Securities rated "BB" and "B" by Moody's or "Ba"
and "B" by S&P or which are similarly  rated by another Rating  Organization  or
are  unrated  but are  deemed by the  Adviser  to be  comparable  in  quality to
instruments that are so rated.

     Investment-grade  Debt  Securities  are those rated at the time of purchase
"AAA," "AA," "A" or "BBB" by S&P,  "Aaa," "Aa," "A" or "Baa" by Moody's or which
are similarly rated by another Rating  Organization or are unrated but deemed by
the Adviser to be comparable in quality to instruments  that are so rated.  Debt
Securities  rated  "BBB" by S&P,  "Baa" by Moody's or the  equivalent  rating of
another Rating Organization, while still deemed investment-grade, are considered
to have  speculative  characteristics  and are more sensitive to economic change
than higher rated bonds. Debt Securities rated below the four highest ratings of
S&P or Moody's are often  referred to as "junk bonds." Such Debt  Securities are
rated below investment-grade and carry a higher degree of risk and are regarded,
on  balance,  as  predominantly  speculative  with  respect to  capacity  to pay
interest and repay principal in accordance with the terms of the obligation. See
"Risk Factors -- Lower Rated Securities."

     The Adviser will select certain mortgage-backed and asset-backed securities
which it believes have superior risk/return  characteristics  versus other fixed
income instruments. Mortgage-backed securities represent pools of mortgage loans
assembled for sale to investors by various  governmental  agencies as well as by
private issuers.  Asset-backed  securities represent pools of other assets (such
as automobile  installment  purchase  obligations  and credit card  receivables)
similarly  assembled  for  sale  by  private  issuers.   See  "Risk  Factors  --
Mortgage-Backed and Asset-Backed  Securities" in this prospectus and "Investment
Objective and Policies" in the Statement of Additional Information.

     The Fund may  also  invest  up to 15% of its  total  assets  in each of the
following:   collateralized   mortgage   obligations   ("CMOs"),   Yankee  Bonds
(dollar-denominated debt securities of foreign issuers),  non-dollar denominated
bonds of foreign or domestic issuers,  securities that can be purchased and sold
privately to institutional investors pursuant to Rule 144A, and convertible Debt
Securities of U.S. and foreign issuers  (including  convertible  preferred stock
and notes). See "Risk Factors" in this Prospectus and "Investment  Objective and
Policies" in the Statement of Additional Information.

     The Fund may invest in debt  securities  issued by the U.S.  Government  or
government agencies,  repurchase  agreements and reverse repurchase  agreements,
foreign currency exchange transactions,  dollar rolls, futures, option contracts
(including  options  on  futures)  and  stripped  securities.  The Fund may make
when-issued  purchases  and  forward  commitments.  See "Risk  Factors"  in this
Prospectus  and  "Investment   Objective  and  Policies"  in  the  Statement  of
Additional Information.

                                       4
<PAGE>

     The Fund may invest in registered investment companies and investment funds
in foreign countries subject to the provisions of the Investment  Company Act of
1940, as amended (the "1940 Act"), and as discussed in "Investment Objective and
Policies" in the  Statement of  Additional  Information.  If the Fund invests in
such investment  companies,  the Fund will bear its  proportionate  share of the
costs incurred by such companies, including investment advisory fees.

     Although the Fund has no restriction as to the maximum or minimum  duration
of any  individual  security held by it, during  normal  market  conditions  the
Fund's average effective duration will generally be within 5% of the duration of
the  Lehman  Brothers  Aggregate  Bond  Index.  "Duration"  is a  term  used  by
investment  managers  to express the  average  time to receipt of expected  cash
flows  (discounted  to  their  present  value)  on  a  particular  fixed  income
instrument  or a  portfolio  of  instruments.  Duration  takes into  account the
pattern of a security's cash flow over time, including how cash flow is affected
by prepayments  and changes in interest  rates.  For example,  the duration of a
five-year zero coupon bond that pays no interest or principal until the maturity
of the bond is five years.  This is because a zero coupon bond  produces no cash
flow  until the  maturity  date.  On the  other  hand,  a coupon  bond that pays
interest  semi-annually  and  matures in five years will have a duration of less
than five years, which reflects the semi-annual cash flows resulting from coupon
payments. Duration also generally defines the effect of interest rate changes on
bond prices.  Generally, if interest rates increase by one percent, the value of
a security having an effective duration of five years would decrease in value by
five percent.

     The  Fund's  investment  objectives  and  policies  described  above may be
changed  by  RBB's  Board  of  Directors  without  the  approval  of the  Fund's
shareholders.

INVESTMENT LIMITATIONS
- --------------------------------------------------------------------------------
     The  Fund may not  change  the  following  investment  limitations  without
shareholder approval. (A complete list of the investment limitations that cannot
be changed without such a vote of the shareholders is contained in the Statement
of Additional Information under "Investment Objective and Policies.")

     The Fund may not:

         1.  Purchase the  securities of any one issuer,  other than  securities
     issued  or   guaranteed   by  the  U.S.   Government  or  its  agencies  or
     instrumentalities,  if immediately  after and as a result of such purchase,
     more than 5% of the value of the Fund's  total  assets would be invested in
     the securities of such issuer,  or more than 10% of the outstanding  voting
     securities of such issuer would be owned by the Fund, except that up to 25%
     of the value of the Fund's total assets may be invested  without  regard to
     such limitations.

         2. Purchase any securities  which would cause, at the time of purchase,
     25% or more of the value of the total  assets of the Fund to be invested in
     the obligations of issuers in any single  industry,  provided that there is
     no limitation with respect to investments in U.S. Government obligations.

         3. Borrow  money or issue senior  securities,  except that the Fund may
     borrow from banks and enter into reverse  repurchase  agreements and dollar
     rolls for temporary purposes in amounts up to one-third of the value of its
     total  assets  at the  time of  such  borrowing;  or  mortgage,  pledge  or
     hypothecate  any assets,  except in connection  with any such borrowing and
     then in amounts not in excess of one-third of the value of the Fund's total
     assets at the time of such borrowing. The Fund will not purchase securities
     while its aggregate  borrowings  (including reverse repurchase  agreements,
     dollar  rolls and  borrowings  from banks) are in excess of 5% of its total
     assets.  Securities held in escrow or separate  accounts in connection with
     the Fund's  investment  practices  are not  considered  to be borrowings or
     deemed to be pledged for purposes of this limitation.

     If a percentage  restriction under one of the Funds' investment policies or
restrictions  or the use of assets is  adhered to at the time a  transaction  is
effected, later changes in percentage resulting from changing values will not be
considered a violation  (except with respect to any restrictions  that may apply
to borrowings or senior securities issued by the Fund).

                                       5
<PAGE>

PORTFOLIO TURNOVER

     The Fund retains the right to sell securities irrespective of how long they
have been held. The Adviser  estimates that the annual turnover in the Fund will
be  approximately  100%.  High portfolio  turnover (100% or more) will generally
result  in  higher  transaction  costs  to a  portfolio  and may  result  in the
realization  of  short-term  capital gains that are taxable to  shareholders  as
ordinary income.

RISK FACTORS
- --------------------------------------------------------------------------------

INTEREST RATE RISK

     Generally,  the  market  value of fixed  income  securities  is  subject to
interest rate  fluctuation  and can be expected to vary  inversely to changes in
the prevailing interest rates. Thus, the value of portfolio  investments held by
the Fund is likely to decline if prevailing interest rates rise, and vice versa.

LOWER RATED SECURITIES

     Investors should carefully  consider the relative risks of investing in the
higher  yielding  (and,  therefore,  higher  risk) debt  securities  rated below
investment-grade  by S&P or  Moody's,  or which are  similarly  rated by another
Rating Organization or are unrated but deemed by the Adviser to be comparable to
instruments so rated.

     The Fund's  investments in obligations rated below the four highest ratings
of S&P and Moody's have different risks than  investments in securities that are
rated  "investment-grade."  Risk  of  loss  upon  default  by  the  borrower  is
significantly greater because lower-rated securities are generally unsecured and
are often subordinated to other creditors of the issuer, and because the issuers
frequently  have high levels of  indebtedness  and are more sensitive to adverse
economic conditions,  such as recessions,  individual corporate developments and
increasing  interest rates than are  investment-grade  issuers. As a result, the
market price of such  securities,  and the net asset value of the Fund's Shares,
may be particularly volatile.

     Additional risks associated with  lower-rated  fixed income  securities are
(a) the relatively  low trading market  liquidity for the securities and (b) the
creditworthiness of the issuers of such securities.  During an economic downturn
or substantial  period of rising  interest rates,  highly-leveraged  issuers may
experience financial stress that would adversely affect their ability to service
their principal and interest  payment  obligations,  to meet projected  business
goals and to obtain  additional  financing.  An  economic  downturn  could  also
disrupt the market for  lower-rated  bonds  generally and  adversely  affect the
value of outstanding bonds and the ability of the issuers to repay principal and
interest.  If the issuer of a lower-rated  security held by the Fund  defaulted,
the Fund could incur additional expenses to seek recovery. Adverse publicity and
investor  perceptions,  whether or not based on fundamental  analysis,  may also
decrease the values and liquidity of  lower-rated  securities  held by the Fund,
especially  in a thinly  traded  market.  Finally,  the Fund's  trading in fixed
income  securities  entails  risks that  capital  losses  rather than gains will
result. As a result,  investment in the Fund should not be considered a complete
investment program.

     The  Adviser  will  continually  evaluate  lower-rated  securities  and the
ability of their issuers to pay interest and  principal.  The Fund's  ability to
achieve its investment  objectives may be more dependent on the Adviser's credit
analysis  than  might be the case  for a fund  that  invested  in  higher  rated
securities.  See the "Appendix" in the Statement of Additional Information for a
general description of securities ratings.

MORTGAGE-BACKED AND ASSET-BACKED SECURITIES

     Mortgage-backed  securities,  like other fixed income  instruments,  may be
subject to risks including price fluctuations due to interest rate changes.  The
returns on mortgage-backed securities may also be negatively affected by changes
in principal pre-payment rates due to interest rate volatility.

                                       6
<PAGE>

     Mortgage-related securities acquired by the Fund may include collateralized
mortgage  obligations  ("CMOs"),  a type of  derivative,  issued by the  Federal
National  Mortgage  Association,  the Federal  Home Loan  Mortgage  Corporation,
Government  National Mortgage  Association or other U.S.  Government agencies or
instrumentalities,  as well as by private issuers.  CMOs may involve  additional
risks other than those found in other types of  mortgage-related  obligations in
that they may exhibit more price  volatility  and  interest  rate risk than such
obligations.  During  periods  of rising  interest  rates,  CMOs may lose  their
liquidity as CMO market makers may choose not to repurchase, or may offer prices
based on current market  conditions,  which are  unacceptable to a fund based on
the  fund's  analysis  of the  market  value of the  security.  See  "Investment
Objectives and Policies" in the Statement of Additional Information.

     Asset-backed securities are also subject to declines in market value during
periods of rising  interest  rates.  Due to the possibility of prepayment of the
underlying obligations,  asset-backed securities have less potential for capital
appreciation than other debt securities of comparable  maturities during periods
of declining  interest rates. As a result,  asset-backed  securities may be less
effective than other fixed income securities as a means of locking in attractive
interest rates for the long term.

REVERSE REPURCHASE AGREEMENTS AND DOLLAR ROLLS

     The Fund may enter  into  reverse  repurchase  agreements  with  respect to
portfolio  securities  for  temporary  purposes  (such as to obtain cash to meet
redemption  requests)  when the  liquidation  of portfolio  securities is deemed
disadvantageous or inconvenient by the Adviser.  Reverse  repurchase  agreements
involve the sale of securities held by the Fund pursuant to the Fund's agreement
to repurchase the securities at an agreed-upon price, date and rate of interest.
Such agreements are considered to be borrowings under the Investment Company Act
of 1940  (the  "1940  Act"),  and may be  entered  into  only for  temporary  or
emergency purposes.  While reverse repurchase transactions are outstanding,  the
Fund will  maintain  in a  segregated  account  with the Fund's  custodian  or a
qualified  sub-custodian,  cash or liquid securities of an amount at least equal
to the market value of the  securities,  plus accrued  interest,  subject to the
agreement and will monitor the account to ensure that such value is  maintained.
Reverse  repurchase  agreements  involve  the risk that the market  value of the
securities  sold by the Fund may decline below the price of the  securities  the
Fund is obligated to repurchase. The Fund may also enter into "dollar rolls," in
which it sells fixed income  securities  for  delivery in the current  month and
simultaneously  contracts to repurchase substantially similar (same type, coupon
and maturity) securities on a specified future date. During the roll period, the
Fund would forgo principal and interest paid on such securities.  The Fund would
be compensated by the difference between the current sales price and the forward
price for the future  purchase,  as well as by the  interest  earned on the cash
proceeds of the initial sale.

FOREIGN SECURITIES RISK

     The Fund may invest in foreign securities, as described above. Investing in
securities of foreign issuers involves  considerations not typically  associated
with investing in securities of companies  organized and operating in the United
States.  Foreign  securities  generally  are  denominated  and pay  dividends or
interest  in  foreign  currencies.  The Fund may hold from time to time  various
foreign  currencies  pending  their  investment  in foreign  securities or their
conversion into U.S. dollars. The value of the assets of the Fund as measured in
U.S.  dollars may therefore be affected  favorably or  unfavorably by changes in
exchange  rates.  There may be less publicly  available  information  concerning
foreign  issuers  than  is  available  with  respect  to U.S.  issuers.  Foreign
securities  may  not  be  registered  with  the  U.S.  Securities  and  Exchange
Commission,  and  generally,  foreign  companies  are  not  subject  to  uniform
accounting,  auditing and financial reporting  requirements  comparable to those
applicable to U.S. issuers.  See "Investment  Objectives and Policies -- Foreign
Securities" in the Statement of Additional Information.

FOREIGN CURRENCY EXCHANGE TRANSACTIONS

     Because  the Fund may buy and sell  securities  denominated  in  currencies
other than the U.S.  dollar,  and may  receive  interest  and sale  proceeds  in
currencies other than the U.S. dollar, the Fund from time to time may enter into
foreign  currency  exchange  transactions  to convert the U.S. dollar to foreign
currencies, to convert foreign currencies to the U.S. dol-

                                       7
<PAGE>

lar and to convert  foreign  currencies  to other  foreign  currencies.  Forward
foreign currency exchange  contracts are agreements to exchange one currency for
another -- for  example,  to  exchange a certain  amount of U.S.  dollars  for a
certain  amount of Japanese  yen -- at a future  date and at a specified  price.
Typically,  the other party to a currency exchange contract will be a commercial
bank  or  other  financial   institution.   A  fund  either  enters  into  these
transactions  on a spot (i.e.,  cash) basis at the spot rate  prevailing  in the
foreign currency  exchange market, or uses forward contracts to purchase or sell
foreign currencies.

     Forward foreign  currency  exchange  contracts also allow the Fund to hedge
the currency risk of portfolio  securities  denominated  in a foreign  currency.
This  technique  permits  the  assessment  of the  merits  of a  security  to be
considered  separately  from the currency  risk. By separating the asset and the
currency decision, it is possible to focus on the opportunities presented by the
security  apart  from the  currency  risk.  Although  forward  foreign  currency
exchange  contracts  are of short  duration,  generally  between  one and twelve
months,  the forward foreign  currency  exchange  contracts are rolled over in a
manner consistent with a more long-term  currency  decision.  There is a risk of
loss to the Fund if the other party does not complete the transaction.

EUROPEAN CURRENCY UNIFICATION

     Many European countries are about to adopt a single European currency,  the
euro.  On January 1, 1999,  the euro will become legal tender for all  countries
participating in the Economic and Monetary Union ("EMU"). A new European Central
Bank will be created to manage the monetary policy of the new unified region. On
the same date,  the exchange  rates will be  irrevocably  fixed  between the EMU
member countries.  National currencies will continue to circulate until they are
replaced by euro coins and bank notes by the middle of 2002.

     This change is likely to significantly  impact the European capital markets
in which the Fund may invest and may result in the Fund facing  additional risks
in pursuing its investment  objective.  These risks, which include,  but are not
limited  to,  uncertainty  as to  the  proper  tax  treatment  of  the  currency
conversion, volatility of currency exchange rates as a result of the conversion,
uncertainty  as to capital  market  reaction,  conversion  costs that may affect
issuer  profitability  and  creditworthiness,  and lack of participation by some
European  countries,  may increase the  volatility of the Fund's net asset value
per share.

WHEN-ISSUED PURCHASES AND FORWARD COMMITMENTS

     The Fund may  purchase  securities  on a  when-issued  basis or enter  into
forward commitment transactions.  When the Fund agrees to purchase securities on
a when-issued basis or enters into a forward commitment to purchase  securities,
the Custodian will set aside cash,  U.S.  Government  securities or other liquid
assets  equal to the  amount of the  purchase  or the  commitment  in a separate
account.  As a result,  the Fund's liquidity and ability to manage its portfolio
might be affected in the event its when-issued  purchases or forward commitments
ever  exceeded  25% of the  value  of its  assets.  In  the  case  of a  forward
commitment to sell portfolio  securities,  the Custodian will hold the portfolio
securities in a segregated account while the commitment is outstanding. When the
Fund engages in when-issued and forward  commitment  transactions,  it relies on
the other  party to  consummate  the  trade.  Failure of such party to do so may
result in the Fund  incurring a loss or missing an opportunity to obtain a price
considered to be advantageous.

YEAR 2000
- --------------------------------------------------------------------------------
     Like  other  mutual  funds,   financial  and  business   organizations  and
individuals  around  the  world,  the Fund could be  adversely  affected  if the
computer systems used by the Adviser and the Fund's other service providers,  or
persons with whom they deal, do not properly process and calculate  date-related
information  and data  from and after  January  1,  2000.  This  possibility  is
commonly known as the "Year 2000 Problem." The Year 2000 Problem could also hurt
companies whose securities the Fund holds or securities markets  generally.  The
Fund has been advised by the Adviser,  the Administrators and the Custodian that
they are actively  taking steps to address the Year 2000 Problem with respect to
the computer

                                       8
<PAGE>

systems that they use and to obtain  assurances that comparable  steps are being
taken by the  Fund's  other  major  service  providers.  While  there  can be no
assurance that the Fund's service  providers  will be Year 2000  compliant,  the
Fund's  service  providers  expect  that  their  plans to be  compliant  will be
achieved.

ASSET ALLOCATION

     From time to time, the Fund may experience  relatively  large  purchases or
redemptions  due to asset  allocation  decisions made by the Advisor for clients
receiving Asset Allocation account management services involving  investments in
the Fund.  These  transactions  may have a  material  effect on the Fund,  since
redemptions  caused by  reallocations  may result in the Fund selling  portfolio
securities,  and  purchases  caused  by  reallocations  may  result  in the Fund
receiving additional cash that it will have to invest. While it is impossible to
predict  the  overall  impact of these  transactions  over time,  there could be
adverse  effects on  portfolio  management  to the  extent  that the Fund may be
required  to sell  securities  at times  when it would not  otherwise  do so, or
receive  cash  that  cannot  be  invested  in  an  expeditious   manner.   These
transactions  could also have tax consequences if the sale of securities results
in gains and could also increase  transaction costs. The Advisor is committed to
minimizing  the  impact  of such  transactions  on the Fund to the  extent it is
consistent  with  pursuing the  investment  objectives  of clients for which the
Advisor  provides  Asset  Allocation  account   management   services  involving
investments in the Fund and monitors the impact of asset allocation decisions on
the Fund.

GENERAL

     Investment  methods  described in this Prospectus are among those which the
Fund has the power to utilize.  Some may be employed on a regular basis;  others
may not be used at all.  Accordingly,  reference  to any  particular  method  or
technique  carries no implication that it will be utilized or, if it is, that it
will be successful.

MANAGEMENT
- --------------------------------------------------------------------------------

BOARD OF DIRECTORS

     The  business  and  affairs  of RBB and the  Fund  are  managed  under  the
direction of RBB's Board of Directors.

INVESTMENT ADVISER

     Boston Partners Asset Management,  L.P.,  located at 28 State Street,  21st
Floor, Boston, Massachusetts 02109, serves as the Fund's investment adviser. The
Adviser  provides  investment  management  and investment  advisory  services to
investment  companies and other institutional  accounts that had aggregate total
assets under  management as of October 31, 1998 in excess of $16.0 billion.  The
adviser  is  organized  as a Delaware  limited  partnership  whose sole  general
partner is Boston Partners, Inc., a Delaware corporation.

     Subject to the supervision  and direction of RBB's Board of Directors,  the
Adviser manages the Fund's  portfolio in accordance  with the Fund's  investment
objectives and policies,  makes investment decisions for the Fund, places orders
to purchase and sell securities and employs professional  portfolio managers and
securities  analysts who provide research services to the Fund. For its services
to the Fund,  the Adviser is paid an advisory  fee computed at an annual rate of
0.40% of the Fund's average daily net assets, which is calculated daily and paid
monthly.  The Adviser has notified RBB, however,  that it intends to limit total
fund operating expenses to .60% during the Fund's current fiscal year.

PORTFOLIO MANAGEMENT

     The day-to-day  portfolio  management of the Fund is the  responsibility of
William R. Leach who is a senior  portfolio  manager of the Adviser and Chairman
of the Fixed Income  Strategy  Committee.  Prior to joining the Adviser in April
1995, Mr. Leach was employed by The Boston Company Asset Management,  Inc. ("The
Boston  Company")  from 1988 through April 1995 where he was a senior  portfolio
manager and Director of the Fixed Income Strategy Committee.  Mr. Leach has over
16 years of investment  experience and is a Chartered Financial Analyst ("CFA").
Mr. Leach will be assisted by Glenn

                                       9
<PAGE>


S. Davis,  Joseph F. Feeney,  Jr. and Michael A. Mullaney.  Mr. Davis is a Fixed
Income  Portfolio  Manager with the Adviser and is also a CFA.  Prior to joining
the Adviser in April 1995, he was Vice  President  and Portfolio  Manager at The
Boston Company,  specializing in short and  intermediate  term corporate  bonds.
Prior to that position, he was responsible for the Short-term Fixed Income Group
at State  Street  Global  Advisors.  He has a total  of 17  years of  investment
experience.  Mr. Feeney is a Fixed Income Portfolio Manager with the Adviser and
also a CFA.  Prior to joining the Adviser in April 1995, he was  Assistant  Vice
President  and   Mortgage-backed   Securities   Portfolio   Manager  for  Putnam
Investments.  Mr.  Mullaney is a Fixed Income  Portfolio  Manager who joined the
Adviser in June 1997. From 1984 to 1997, he was employed at Putnam  Investments,
most   recently  as  Managing   Director  and  Senior   Investment   Strategist,
specializing in portfolio strategy and management. His prior experience included
a   position   as  a  senior   Consultant   from   1981  to  1983   with   Chase
Econometrics/Interactive  Data  Corporation,  where he focused  on  quantitative
methodologies  in fixed  income and equity  management.  He has over 16 years of
investment experience.

ADMINISTRATOR

     PFPC  Inc.  ("PFPC")  serves  as  administrator  to the Fund and  generally
assists the Fund in all aspects of its administration and operations,  including
matters relating to the maintenance of financial records and accounting.  PFPC's
principal  offices are located at 400  Bellevue  Parkway,  Wilmington,  Delaware
19809.  For its services,  PFPC  receives a fee  calculated at an annual rate of
 .125% of the  Fund's  average  daily net  assets,  with a minimum  annual fee of
$75,000 payable monthly on a pro rata basis.

TRANSFER AGENT, DIVIDEND DISBURSING AGENT AND CUSTODIAN

     PFPC Trust Company, an indirect  wholly-owned subsidiary of PNC Bank Corp.,
will succeed PNC Bank, National Association ("PNC Bank") as the Fund's custodian
pursuant to an assignment. PNC Bank will continue to provide certain services to
PFPC Trust Company.  PFPC  serves as the  Fund's  transfer  agent  and  dividend
disbursing  agent.  The  principal  offices of PFPC are located at 400  Bellevue
Parkway,  Wilmington,  Delaware 19809. PFPC may enter into shareholder servicing
agreements  with  registered   broker-dealers   who  have  entered  into  dealer
agreements  with the  Distributor  ("Authorized  Dealers")  for the provision of
certain shareholder support services to customers of such Authorized Dealers who
are shareholders of the Fund. The services  provided and the fees payable by the
Fund for these services are described in the Statement of Additional Information
under "Investment Advisory, Distribution and Servicing Arrangements."

ADMINISTRATIVE SERVICES AGENT

     Provident  Distributors,   Inc.  ("PDI")  provides  certain  administrative
services  to the Fund's  Institutional  Shares not  otherwise  provided by PFPC.
PDI's  principal   business  address  is  Four  Falls  Corporate  Center,   West
Conshohocken,  Pennsylvania  19428. PDI furnishes certain internal  quasi-legal,
executive and administrative services to the Fund, acts as a liaison between the
Fund and its  various  service  providers  and  coordinates  and  assists in the
preparation of reports prepared on behalf of the Fund. For its services,  PDI is
entitled  to a  monthly  fee  calculated  at the  annual  rate  of  .15%  of the
respective  average daily net assets of the Fund's  Institutional  Class. PDI is
currently  waiving fees in excess of .03% of the average daily net assets of the
Fund's Institutional Class.

DISTRIBUTOR

     PDI acts as distributor for the Shares pursuant to a distribution agreement
(the "Distribution Agreement") with RBB on behalf of the Shares.

                                       10
<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>

   BOSTON PARTNERS BOND FUND                        bp
    (INSTITUTIONAL CLASS)                 BOSTON PARTNERS ASSET MANAGEMENT, L.P.

ACCOUNT APPLICATION
PLEASE NOTE: Do not use this form to open a retirement plan account. For an IRA
application or help with this Application, please call 1-888-261-4073


1              (Please check the appropriate box(es) below.)
Account
Registration:  /  / Individual        /  / Joint Tenant      /  / Other
               _________________________________________________________________
               NAME          SOCIAL SECURITY NUMBER OR TAX ID # OF PRIMARY OWNER

               _________________________________________________________________
               NAME OF            JOINT OWNER SOCIAL SECURITY NUMBER OR TAX ID #
               JOINT OWNER

               For joint accounts, the account registrants will be joint tenants
               with right of survivorship and not tenants in common unless
               tenants in common or community property registrations are 
               requested.

               /  / UNIFORM GIFTS/TRANSFER TO MINOR'S ACT
GIFT TO 
MINOR:         _________________________________________________________________
               NAME OF ADULT CUSTODIAN (ONLY ONE PERMITTED)

               _________________________________________________________________
               NAME OF MINOR (ONLY ONE PERMITTED)

               _________________________________________________________________
               MINOR'S SOCIAL SECURITY NUMBER AND DATE OF BIRTH

CORPORATION,
PARTNERSHIP,
TRUST OR
OTHER ENTITY:  _________________________________________________________________
               NAME OF CORPORATION, PARTNERSHIP,           NAME(S) OF TRUSTEE(S)
               OR OTHER

               _________________________________________________________________
               TAXPAYER IDENTIFICATION NUMBER

2              _________________________________________________________________
Mailing        STREET OR P.O. BOX AND/OR APARTMENT NUMBER
Address:
               _________________________________________________________________
               CITY                     STATE                    ZIP CODE

               _________________________________________________________________
               DAY PHONE NUMBER                        EVENING PHONE NUMBER

<PAGE>

3              Minimum initial investment       Amount of investment $__________
Investment     of $100,000. 
Information:
               Make the check payable to Boston Partners Bond Fund.

               Shareholders may not purchase shares of this Fund with a check
               issued by a third party and endorsed over to the Fund.

               NOTE: Dividends and capital gains may be reinvested or paid by
               check. If no options are selected below, both dividends and
               capital gains will be reinvested in additional Fund shares.

DISTRIBUTION   INTEREST:          Pay by check / /       Reinvest / /
OPTIONS:       CAPITAL GAINS:     Pay by check / /       Reinvest / /


4
Telephone      To use this option, you must initial the appropriate line below.
Redemption
or Exchange:   I authorize the Transfer Agent to accept instructions from any 
               persons to redeem or exchange shares in my account(s) by
               telephone in accordance with the procedures and conditions set
               forth in the Fund's current prospectus.

               
                ______________________  _________________ Redeem shares, and 
                  individual initial      joint initial   send the proceeds to
                                                          the address of record.


                ______________________  _________________ Exchange shares for
                  individual initial      joint initial   shares of the Boston 
                                                          Partners Large Cap 
                                                          Value Fund, Mid Cap 
                                                          Value Fund, Micro Cap
                                                          Value Fund or Market
                                                          Neutral Fund.

5
Automatic      The Automatic Investment Plan which is available to shareholders 
Investment     of the Fund, makes possible regularly scheduled purchases of Fund
Plan:          shares to allow dollar-cost averaging. The Fund's Transfer Agent 
               can arrange for an amount of money selected by you to be deducted
               from your checking account and used to purchase shares of the    
               Fund.                                                            
               
               Please debit $________ from my checking account (named below) on
               or about the 20th of the month. PLEASE ATTACH AN UNSIGNED, VOIDED
               CHECK. 

               / / Monthly  / / Every Alternate Month  / / Quarterly  / / Other

BANK OF        _________________________________________________________________
RECORD:        BANK NAME                         STREET ADDRESS OR P.O. BOX

               _________________________________________________________________
               CITY                   STATE                        ZIP CODE

               _________________________________________________________________
               BANK ABA NUMBER                          BANK ACCOUNT NUMBER
<PAGE>


6
Signatures:    The undersigned warrants that I (we) have full authority and, if
               a natural person, I (we) am (are) of legal age to purchase shares
               pursuant to this Account Application, and I (we) have received a
               current prospectus for the Fund in which I (we) am (are)
               investing. 

               Under the Interest and Dividend Tax Compliance Act of 1983, the
               Fund is required to have the following certification:

               Under penalties of perjury, I certify that:

               (1)       The number shown on this form is my correct taxpayer
                         identification number (or I am waiting for a number to
                         be issued to me), and

               (2)       I am not subject to backup withholding because (a) I am
                         exempt from backup withholding, or (b) I have not been
                         notified by the Internal Revenue Service that I am
                         subject to 31% backup withholding as a result of a
                         failure to report all interest or dividends, or (c) the
                         IRS has notified me that I am no longer subject to
                         backup withholding.

               NOTE: YOU MUST CROSS OUT ITEM (2) ABOVE IF YOU HAVE BEEN NOTIFIED
               BY THE IRS THAT YOU ARE CURRENTLY SUBJECT TO BACKUP WITHHOLDING
               BECAUSE YOU HAVE FAILED TO REPORT ALL INTEREST AND DIVIDENDS ON
               YOUR TAX RETURN. THE INTERNAL REVENUE SERVICE DOES NOT REQUIRE
               YOUR CONSENT TO ANY PROVISION OF THIS DOCUMENT OTHER THAN THE
               CERTIFICATION REQUIRED TO AUDIT BACKUP WITHHOLDING.

               _________________________________________________________________
               SIGNATURE OF APPLICANT                              DATE

               _________________________________________________________________
               PRINT NAME                                  TITLE (IF APPLICABLE)

               _________________________________________________________________
               SIGNATURE OF JOINT OWNER                             DATE

               _________________________________________________________________
               PRINT NAME                                  TITLE (IF APPLICABLE)


               (If you are signing for a corporation, you must indicate
               corporate office or title. If you wish additional signatories on
               the account, please include a corporate resolution. If signing as
               a fiduciary, you must indicate capacity.)

               For information on additional options, such as IRA Applications,
               rollover requests for qualified retirement plans, or for wire
               instructions, please call us at 1-888-261-4073.

               MAIL COMPLETED ACCOUNT APPLICATION AND CHECK TO:        
                                                                       
                            THE BOSTON PARTNERS BOND FUND 
                            C/O PFPC INC.                 
                            P.O. BOX 8852                 
                            WILMINGTON, DE  19899-8852    
<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>

EXPENSES

     The  expenses  of the  Fund  are  deducted  from its  total  income  before
dividends are paid. These expenses include, but are not limited to: fees paid to
the  Adviser  and PFPC;  administrative  services  fees;  fees and  expenses  of
officers  and  directors  who are not  affiliated  with any of RBB's  investment
advisers,   sub-advisers  or  the  Distributor;  taxes;  interest;  legal  fees;
custodian fees;  auditing fees;  brokerage fees and commissions;  certain of the
fees and  expenses of  registering  and  qualifying  the Fund and the Shares for
distribution  under  federal and state  securities  laws;  expenses of preparing
prospectuses  and  statements  of  additional  information  and of printing  and
distributing them annually to existing shareholders that are not attributable to
a  particular  class of shares of RBB;  the expense of reports to  shareholders,
shareholders'  meetings and proxy  solicitations  that are not attributable to a
particular  class of shares of RBB;  fidelity  bond and  directors and officers'
liability insurance premiums; the expense of using independent pricing services;
and other  expenses  that are not  expressly  assumed by the  Adviser  under its
investment  advisory agreement with respect to the Fund. Any general expenses of
RBB that are not readily  identifiable  as belonging to a particular  investment
portfolio of RBB will be allocated among all investment  portfolios of RBB based
upon  the  relative  net  assets  of  the  investment  portfolios.  Distribution
expenses,  transfer  agency  expenses,  expenses of  preparation,  printing  and
distributing   prospectuses,   statements  of  additional   information,   proxy
statements and reports to  shareholders  and  registration  fees,  identified as
belonging to a particular class, are allocated to such class.

     The  Adviser  may  assume  expenses  of the Fund from time to time.  To the
extent any service  providers  assume  expenses of the Fund,  such assumption of
expenses will have the effect of lowering the Fund's  overall  expense ratio and
increasing its yield to investors.

HOW TO PURCHASE SHARES
- --------------------------------------------------------------------------------

GENERAL

     Shares representing interests in the Fund are offered continuously for sale
by the  Distributor and may be purchased  without  imposition of a sales charge.
Shares may be purchased initially by completing the application included in this
Prospectus and forwarding the application to the Fund's  transfer  agent,  PFPC.
Purchases  of Shares may be  effected by wire to an account to be  specified  by
PFPC or by mailing a check or  Federal  Reserve  Draft,  payable to the order of
"The  Boston  Partners  Bond Fund" c/o PFPC  Inc.,  P.O.  Box 8852,  Wilmington,
Delaware 19899-8852.  The name of the Fund, Boston Partners Bond Fund, must also
appear on the check or Federal  Reserve  Draft.  Shareholders  may not  purchase
shares of the Boston Partners Bond Fund with a check issued by a third party and
endorsed  over to the Fund.  Federal  Reserve  Drafts are  available at national
banks or any state bank which is a member of the Federal Reserve System. Initial
investments  in the Fund must be at least  $100,000 and  subsequent  investments
must be at least $5,000.  For purposes of meeting the minimum initial  purchase,
clients which are part of endowments, foundations or other related groups may be
aggregated.  The Fund reserves the right to suspend the offering of Shares for a
period of time or to reject any purchase order.

     Shares may be purchased by  principals  and employees of the Adviser and by
their  spouses and  children  either  directly or through any trust that has the
principal,  employee,  spouse  or  child  as the  primary  beneficiaries,  their
individual  retirement  accounts,  or any pension and profit-sharing plan of the
Adviser without being subject to the minimum investment limitations.

     Shares may be purchased on any  Business  Day. A "Business  Day" is any day
that the New York Stock  Exchange (the "NYSE") is open for business.  Currently,
the NYSE is closed on weekends and New Year's Day, Dr. Martin  Luther King,  Jr.
Day,  Presidents' Day, Good Friday,  Memorial Day,  Independence Day, Labor Day,
Thanksgiving  Day and Christmas  Day and on the  preceding  Friday or subsequent
Monday when one of these holidays falls on a Saturday or Sunday.

     The price paid for Shares  purchased  initially  or  acquired  through  the
exercise of an exchange  privilege is based on the net asset value next computed
after a purchase  order is  received  in good  order by the Fund or its  agents.
Orders  received by the Fund or its agents after the close of regular trading on
the New York Stock Exchange, Inc. (currently 4 p.m., Eastern time) are priced at
the net asset value next  determined  on the  following  business  day. In those
cases where an investor

                                       11
<PAGE>

pays for Shares by check,  the purchase  will be effected at the net asset value
next  determined  after  the  Fund or its  agents  receives  the  order  and the
completed application.

     An investor may also purchase  Shares by having his bank or his broker wire
Federal Funds to PFPC. An investor's bank or broker may impose a charge for this
service.  The Fund does not currently impose a service charge for effecting wire
transfers  but  reserves  the right to do so in the  future.  In order to ensure
prompt receipt of an investor's Federal Funds wire, for an initial investment it
is important that an investor follows these steps:

     A. Telephone the Fund's transfer agent, PFPC, toll-free (888) 261-4073, and
provide PFPC with your name, address,  telephone number,  Social Security or Tax
Identification  Number, the Fund selected,  the amount being wired, and by which
bank. PFPC will then provide an investor with a Fund account  number.  Investors
with existing accounts should also notify PFPC prior to wiring funds.

     B. Instruct your bank or broker to wire the specified amount, together with
your assigned account number, to PFPC's account with PNC Bank:

                  PNC Bank, N.A.
                  Philadelphia, PA 19103
                  ABA NUMBER: 0310-0005-3
                  CREDITING ACCOUNT NUMBER: 86-1108-2507
                  FROM: (name of investor)
                  ACCOUNT NUMBER: (Investor's account number with the Fund)
                  FOR PURCHASE OF: Boston Partners Bond Fund
                  AMOUNT: (amount to be invested)

     C. Fully complete and sign the application and mail it to the address shown
thereon. PFPC will not process purchases until it receives a fully completed and
signed application.

     For subsequent investments, an investor should follow steps A and B above.

     Additional  investments in Shares may be made  automatically by authorizing
the Fund's  transfer agent to withdraw funds from your bank account on a regular
basis.  Investors  desiring to  participate in the automatic  investing  program
should call the Fund's  transfer  agent,  PFPC, at (888)  261-4073 to obtain the
appropriate forms.

HOW TO REDEEM AND EXCHANGE SHARES
- --------------------------------------------------------------------------------

REDEMPTION BY MAIL

     Shareholders may redeem for cash some or all of their Shares of the Fund at
any time.  To do so, a written  request in proper form must be sent  directly to
Boston  Partners Bond Fund c/o PFPC Inc.,  P.O. Box 8852,  Wilmington,  Delaware
19899-8852. There is no charge for a redemption.

     A request for  redemption  must be signed by all persons in whose names the
Shares  are   registered.   Signatures  must  conform  exactly  to  the  account
registration.  If the proceeds of the redemption would exceed $10,000, or if the
proceeds are not to be paid to the record owner at the record address, or if the
shareholder is a corporation, partnership, trust or fiduciary, signature(s) must
be  guaranteed  according  to the  procedures  described  below under  "Exchange
Privilege."

     Generally,  a properly signed written  request with any required  signature
guarantee  is all that is required  for a  redemption.  In some cases,  however,
other  documents may be  necessary.  In the case of  shareholders  holding share
certificates,  the certificates for the shares being redeemed must accompany the
redemption  request.  Additional  documentary  evidence  of  authority  is  also
required by the Fund's transfer agent in the event  redemption is requested by a
corporation, partnership, trust, fiduciary, executor or administrator.

                                       12
<PAGE>

INVOLUNTARY REDEMPTION

     RBB  reserves the right to redeem a  shareholder's  account at any time the
net asset value of the account falls below $500 as the result of a redemption or
an exchange request.  Shareholders will be notified in writing that the value of
their  account is less than $500 and will be allowed 30 days to make  additional
investments before the redemption is processed.

PAYMENT OF REDEMPTION PROCEEDS

     In all cases,  the  redemption  price is the net asset value per share next
determined  after the request for  redemption  is received in proper form by the
Fund or its agents.  Payment for Shares  redeemed is made by check mailed within
seven days after  acceptance  by the Fund or its agents of the  request  and any
other necessary  documents in proper order. Such payment may be postponed or the
right of  redemption  suspended as provided by law. If the Shares to be redeemed
have been recently purchased by check, PFPC may delay mailing a redemption check
for up to 15 days, pending a determination that the check has cleared.  The Fund
has  elected  to be  governed  by Rule  18f-1  under  the 1940 Act so that it is
obligated to redeem its Shares solely in cash up to the lesser of $250,000 or 1%
of its net asset value  during any 90-day  period for any one  shareholder  of a
portfolio.

EXCHANGE PRIVILEGE

     The exchange  privilege is available to shareholders  residing in any state
in which the Shares  being  acquired  may be legally  sold.  A  shareholder  may
exchange  Shares  of the Fund  for  Institutional  Shares  of any  other  Boston
Partners Fund of RBB subject to restrictions described under "Exchange Privilege
Limitations" below. Such exchange will be effected at the net asset value of the
exchanged  Fund  and the  net  asset  value  of the  Fund  being  acquired  next
determined after receipt of a request for an exchange by the Fund or its agents.
An exchange of Shares will be treated as a sale for federal income tax purposes.
See  "Taxes." A  shareholder  wishing to make an exchange may do so by sending a
written request to PFPC.

     If the exchanging  shareholder does not currently own Institutional  Shares
of the Boston  Partners  Fund into which he/she  would like to  exchange,  a new
account will be  established  with the same  registration,  dividend and capital
gain options as the account from which shares are  exchanged,  unless  otherwise
specified  in writing  by the  shareholder  with all  signatures  guaranteed.  A
signature  guarantee  may be  obtained  from a domestic  bank or trust  company,
broker, dealer, clearing agency or savings association who are participants in a
medallion program recognized by the Securities Transfer  Association.  The three
recognized  medallion programs are Securities  Transfer Agents Medallion Program
(STAMP),  Stock Exchanges  Medallion Program (SEMP) and New York Stock Exchange,
Inc. Medallion Signature Program (MSP).  Signature  guarantees that are not part
of these programs will not be accepted.  The exchange  privilege may be modified
or  terminated  at any time, or from time to time, by RBB, upon 60 days' written
notice to shareholders.

     If an exchange is to a new account in the Fund,  the dollar value of Shares
acquired  must equal or exceed that Fund's  minimum for a new account;  if to an
existing account,  the dollar value must equal or exceed that Fund's minimum for
subsequent  investments.  If any  amount  remains  in the Fund  from  which  the
exchange  is being made,  such  amount  must not drop below the minimum  account
value required by the Fund.

EXCHANGE PRIVILEGE LIMITATIONS

     The Fund's exchange privilege is not intended to afford  shareholders a way
to speculate on  short-term  movements in the market.  Accordingly,  in order to
prevent excessive use of the exchange privilege that may potentially disrupt the
management  of  the  Funds  and  increase   transactions  costs,  the  Fund  has
established a policy of limiting excessive exchange activity.

     Shareholders are entitled to six (6) exchange redemptions (at least 30 days
apart)  from the Fund  during any  twelve-month  period.  Notwithstanding  these
limitations,  the  Fund  reserves  the  right to  reject  any  purchase  request
(including  purchases by exchange)  that is deemed to be disruptive to efficient
portfolio management.

                                       13
<PAGE>

TELEPHONE TRANSACTIONS

     In order to request an exchange or redemption  by telephone,  a shareholder
must  have  completed  and  returned  an  account  application   containing  the
appropriate telephone election. To add a telephone option to an existing account
that  previously  did  not  provide  for  this  option,  a  Telephone   Exchange
Authorization Form must be filed with PFPC. These forms are available from PFPC.
Once this election has been made,  the  shareholder  may simply  contact PFPC by
telephone  to request the  exchange or  redemption  by calling  (888)  261-4073.
Neither RBB, the Fund, the  Distributor,  the  Administrator  nor any Fund agent
will be liable for any loss,  liability,  cost or expense  for  following  RBB's
telephone transaction  procedures described below or for following  instructions
communicated by telephone that they reasonably believe to be genuine.

     RBB's telephone transaction  procedures include the following measures: (1)
requiring the appropriate  telephone  transaction privilege forms; (2) requiring
the  caller to provide  the names of the  account  owners,  the  account  social
security number and name of the Fund, all of which must match RBB's records; (3)
requiring RBB's service representative to complete a telephone transaction form,
listing  all of the above  caller  identification  information;  (4)  permitting
exchanges only if the two account  registrations  are  identical;  (5) requiring
that  redemption  proceeds be sent only by check to the account owners of record
at the  address of  record,  or by wire only to the owners of record at the bank
account  of  record;  (6)  sending a  written  confirmation  for each  telephone
transaction  to the owners of record at the  address of record  within  five (5)
business days of the call; and (7) maintaining  tapes of telephone  transactions
for six months, if the Fund elects to record shareholder telephone transactions.
For  accounts  held of record by  broker-dealers  (other than the  Distributor),
financial  institutions,   securities  dealers,  financial  planners  and  other
industry  professionals,  additional  documentation or information regarding the
scope of a caller's authority is required.  Finally, for telephone  transactions
in accounts held jointly, additional information regarding other account holders
is required. Telephone transactions will not be permitted in connection with IRA
or other  retirement  plan accounts or by an  attorney-in-fact  under a power of
attorney.

NET ASSET VALUE
- --------------------------------------------------------------------------------
     The net asset value for each class of the Fund is  calculated by adding the
value of the proportionate interest of each class in the Fund's securities, cash
and other assets, deducting the actual and accrued liabilities of each class and
dividing by the total number of outstanding  shares of the class.  The net asset
value is  calculated  as of the  close of  regular  trading  on the NYSE on each
Business Day.

     Valuation of securities held by the Fund is as follows:  securities  traded
on a national  securities  exchange or on the NASDAQ  National Market System are
valued at the last reported sale price that day; securities traded on a national
securities exchange or on the NASDAQ National Market System for which there were
no sales on that day and securities traded on other over-the-counter markets for
which market  quotations are readily available are valued at the mean of the bid
and asked prices;  and  securities  for which market  quotations are not readily
available  are valued at fair  market  value as  determined  in good faith by or
under the  direction of RBB's Board of Directors.  The amortized  cost method of
valuation may also be used with respect to debt  obligations  with sixty days or
less remaining to maturity.

     With the  approval  of the Board of  Directors,  the Fund may use a pricing
service,  bank or broker-dealer  experienced in such matters to value the Fund's
securities. A more detailed discussion of net asset value and security valuation
is contained in the Statement of Additional Information.

                                       14
<PAGE>

DIVIDENDS AND DISTRIBUTIONS
- --------------------------------------------------------------------------------
     The Fund will distribute substantially all of the net investment income and
net realized capital gains, if any, of the Fund to the Fund's shareholders.  All
distributions  are  reinvested  in the form of  additional  full and  fractional
Shares unless a shareholder elects otherwise.

     The Fund will declare and pay dividends from net investment income monthly.
Net realized  capital gains  (including net short-term  capital gains),  if any,
will be distributed at least annually.

TAXES
- --------------------------------------------------------------------------------
     The  following  discussion is only a brief summary of some of the important
tax considerations  generally affecting the Fund and its shareholders and is not
intended as a substitute for careful tax planning. Accordingly, investors in the
Fund should consult their tax advisers with specific  reference to their own tax
situation.

     The Fund will elect to be taxed as a  regulated  investment  company  under
Subchapter M of the Internal  Revenue Code of 1986,  as amended.  So long as the
Fund qualifies for this tax treatment, it will be relieved of federal income tax
on amounts  distributed to  shareholders,  but  shareholders,  unless  otherwise
exempt, will pay income or capital gains taxes on amounts so distributed (except
distributions  that are  treated as a return of capital)  regardless  of whether
such distributions are paid in cash or reinvested in additional shares.

     Distributions  out of the "net capital  gain" (the excess of net  long-term
capital  gain over net  short-term  capital  loss),  if any, of the Fund will be
taxed to shareholders as long-term capital gain regardless of the length of time
a shareholder has held his shares,  whether such gain was reflected in the price
paid for the shares,  or whether  such gain was  attributable  to bonds  bearing
tax-exempt interest.  All other  distributions,  to the extent they are taxable,
are taxed to shareholders as ordinary income.

     RBB will send written  notices to shareholders  annually  regarding the tax
status of distributions made by the Fund.  Dividends declared in December of any
year payable to  shareholders of record on a specified date in such a month will
be deemed to have been  received by the  shareholders  on December 31,  provided
such dividends are paid during  January of the following  year. The Fund intends
to make  sufficient  actual  or  deemed  distributions  prior to the end of each
calendar year to avoid liability for federal excise tax.

     Investors  should be careful to  consider  the tax  implications  of buying
shares just prior to a distribution.  The price of shares purchased at that time
will  reflect  the  amount  of the  forthcoming  distribution.  Those  investors
purchasing shares just prior to a distribution will nevertheless be taxed on the
entire amount of the  distribution  received,  although the  distribution is, in
effect, a return of capital.

     Shareholders  who exchange  shares  representing  interests in one Fund for
shares  representing  interests in another Fund will generally recognize capital
gain or loss for federal income tax purposes.

     Shareholders  who are  nonresident  alien  individuals,  foreign  trusts or
estates,  foreign  corporations  or  foreign  partnerships  may  be  subject  to
different U.S. federal income tax treatment.


                                       15
<PAGE>

MULTI-CLASS STRUCTURE
- --------------------------------------------------------------------------------

     The Fund  offers one other  class of  shares,  Investor  Shares,  which are
offered  directly to  individual  investors  pursuant to a separate  prospectus.
Shares of each class  represent  equal pro rata interests in the Fund and accrue
dividends and calculate net asset value and  performance  quotations in the same
manner.  The Fund will quote  performance of the Investor Shares separately from
Institutional  Shares.  Because  of  different  fees  paid by the  Institutional
Shares,  the total  return on such shares can be  expected,  at any time,  to be
different than the total return on Investor Shares.  Information  concerning the
other class may be obtained by calling the Fund at (888) 261-4073.

DESCRIPTION OF SHARES
- --------------------------------------------------------------------------------
     RBB has authorized  capital of thirty billion shares of Common Stock, $.001
par value per share,  of which 18.326  billion  shares are currently  classified
into 97 different  classes of Common Stock.  See  "Description of Shares" in the
"Statement of Additional Information."

     THIS  PROSPECTUS AND THE STATEMENT OF ADDITIONAL  INFORMATION  INCORPORATED
HEREIN RELATE  PRIMARILY TO THE BOSTON  PARTNERS BOND FUND AND DESCRIBE ONLY THE
INVESTMENT  OBJECTIVES  AND  POLICIES,  OPERATIONS,  CONTRACTS AND OTHER MATTERS
RELATING TO BOSTON PARTNERS BOND FUND.

     Each  share  that   represents  an  interest  in  the  Fund  has  an  equal
proportionate interest in the assets belonging to the Fund with each other share
that  represents  an  interest  in the Fund,  even where a share has a different
class  designation  than  another  share  representing  an interest in the Fund.
Shares of the Fund do not have preemptive or conversion rights.  When issued for
payment  as  described  in this  Prospectus,  Shares  will  be  fully  paid  and
non-assessable.

     RBB  currently  does not intend to hold  annual  meetings  of  shareholders
except  as  required  by the 1940 Act or other  applicable  law.  The law  under
certain circumstances provides shareholders with the right to call for a meeting
of shareholders to consider the removal of one or more directors.  To the extent
required by law, RBB will assist in shareholder communications in such matters.

     Holders of Shares of the Fund will vote in the  aggregate  and not by class
on all matters, except where otherwise required by law. Further, shareholders of
all investment portfolios of RBB will vote in the aggregate and not by portfolio
except as otherwise  required by law or when the Board of  Directors  determines
that the matter to be voted upon affects only the interests of the  shareholders
of  a  particular  investment  portfolio.   (See  the  Statement  of  Additional
Information under "Additional  Information  Concerning Fund Shares" for examples
of when the 1940 Act  requires  voting by  investment  portfolio  or by  class.)
Shareholders  of the Fund are  entitled  to one vote for each  full  share  held
(irrespective of class or portfolio) and fractional votes for fractional  shares
held.  Voting rights are not cumulative  and,  accordingly,  the holders of more
than 50% of the  aggregate  shares of Common  Stock of the Fund may elect all of
the directors.

     As of November 16, 1998, to the Fund's knowledge,  no person held of record
or beneficially 25% or more of the outstanding shares of all classes of RBB.

                                       16
<PAGE>

OTHER INFORMATION
- --------------------------------------------------------------------------------

REPORTS AND INQUIRIES

     Shareholders  will receive  unaudited  semi-annual  reports  describing the
Fund's  investment   operations  and  annual  financial  statements  audited  by
independent accountants. Shareholder inquiries should be addressed to the Fund's
transfer  agent,  PFPC Inc., at Bellevue  Park  Corporate  Center,  400 Bellevue
Parkway, Wilmington, Delaware 19809, toll-free (888) 261-4073.

SHARE CERTIFICATES

     In  the  interest  of  economy  and  convenience,   physical   certificates
representing Shares in the Fund are not normally issued.

HISTORICAL PERFORMANCE INFORMATION

     For the period from commencement of operations  (December 30, 1997) through
August 31, 1998,  the total  return since  inception  (not  annualized)  for the
Institutional Class of Shares of the Fund was as follows:

     Unannualized investment returns for the period ended August 31, 1998

                                                                        SINCE
                                                                      INCEPTION
                                                                      ---------
     Boston Partners Bond Fund
       (Institutional Shares) ......................................     4.79%

     The total return  assumes  reinvestment  of all dividends and capital gains
and  reflects  expense  reimbursements  and  investment  advisory fee waivers in
effect.  Without these expense  reimbursements  waivers,  the Fund's performance
would have been lower.  Of course,  past  performance  is no guarantee of future
results.  Investment return and principal value will fluctuate,  so that Shares,
when  redeemed,  may be worth  more or less  than the  original  cost.  For more
information on performance,  see  "Performance  Information" in the Statement of
Additional Information.

     The table below  presents the Composite  performance  history of certain of
the Adviser's  managed  accounts on an annualized  basis since inception for the
period ended August 31, 1998. The Composite is comprised of all of the Adviser's
institutional  accounts and other  privately  managed  accounts with  investment
objectives,  policies and strategies substantially similar to those of the Fund,
although  the  accounts  have  operating  histories,  whereas  the  Fund had not
commenced  operations  until  December  30,  1997.  The  Composite   performance
information  includes the  reinvestment  of interest  received by the underlying
securities,  realized and unrealized gains and losses,  and reflects the payment
of investment advisory fees. The Composite  performance does not reflect custody
fees or administrative  fees that may be charged by banks,  fiduciaries or other
third  parties in connection  with these  institutional  and  privately  managed
accounts.  The privately managed accounts in the Composite are only available to
the  Adviser's  institutional  advisory  clients.  The past  performance  of the
accounts   which  comprise  the  Composite  is  not  indicative  of  the  future
performance of the Fund. These accounts have lower investment advisory fees than
the Fund and the Composite  performance figures would have been lower if subject
to the higher  fees and  expenses  to be  incurred  by the Fund.  These  private
accounts   are  also  not   subject   to  the   same   investment   limitations,
diversification  requirements  and other  restrictions  which are  imposed  upon
mutual  funds  under  the 1940 Act and the  Internal  Revenue  Code,  which,  if
imposed,  may have adversely affected the performance  results of the Composite.
Listed below the  performance  history for the Composite is a comparative  index
comprised  of  securities  similar to those in which  accounts  contained in the
Composite are invested.

                                       17
<PAGE>

     Average  annualized  investment  returns for the period ended September 30,
1998

                                                          ONE            SINCE
                                                         YEAR          INCEPTION
                                                         --------      ---------
         Composite Performance. .......................    8.70%          9.20%
         Lehman Brothers Aggregate Bond Index .........   11.50%          8.60%

     The Lehman Brothers Aggregate Bond Index is a broad market-weighted  index,
which  encompasses  three  major  classes  of   investment-grade,   fixed-income
securities  with  maturities  greater  than one year,  including  U.S.  Treasury
securities, corporate bonds and mortgage-backed securities.

* The Adviser commenced managing these accounts on June 1, 1995

FUTURE PERFORMANCE INFORMATION

     From  time to time,  the  Fund may  advertise  its  performance,  including
comparisons  to other  mutual funds with similar  investment  objectives  and to
stock or other relevant indices.  All such  advertisements will show the average
annual total return over one, five and ten year periods or, if such periods have
not yet elapsed,  shorter  periods  corresponding  to the life of the Fund. Such
total  return  quotations  will be computed by finding  the  compounded  average
annual total  return for each time period that would equate the assumed  initial
investment of $1,000 to the ending redeemable value, net of fees, according to a
required standardized  calculation.  The standard calculation is required by the
SEC to provide consistency and comparability in investment company  advertising.
The Fund may also from time to time  include in such  advertising  an  aggregate
total return figure or a total return figure that is not calculated according to
the  standardized  formula  in order  to  compare  more  accurately  the  Fund's
performance with other measures of investment  return.  For example,  the Fund's
total return may be compared with data published by Lipper Analytical  Services,
Inc., CDA  Investment  Technologies,  Inc. or  Weisenberger  Investment  Company
Service,  or with the performance of the Lehman  Brothers  Aggregate Bond Index.
Performance  information  may also include  evaluation of the Fund by nationally
recognized   ranking   services  and   information   as  reported  in  financial
publications  such as Business  Week,  Fortune,  Institutional  Investor,  Money
Magazine,  Forbes,  Barron's,  The Wall Street  Journal,  The New York Times, or
other national,  regional or local publications.  All advertisements  containing
performance  data will include a legend  disclosing that such  performance  data
represents past  performance and that the investment  return and principal value
of an investment will fluctuate so that an investor's Shares, when redeemed, may
be worth more or less than their original cost.

                                       18
<PAGE>

NO  PERSON  HAS  BEEN   AUTHORIZED   TO  GIVE  ANY   INFORMATION   OR  MAKE  ANY
REPRESENTATIONS  NOT  CONTAINED  IN THIS  PROSPECTUS  OR IN RBB'S  STATEMENT  OF
ADDITIONAL INFORMATION  INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE
OFFERING MADE BY THIS  PROSPECTUS  AND, IF GIVEN OR MADE,  SUCH  REPRESENTATIONS
MUST NOT BE RELIED UPON AS HAVING  BEEN  AUTHORIZED  BY RBB OR ITS  DISTRIBUTOR.
THIS  PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY RBB OR BY THE DISTRIBUTOR IN
ANY JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY BE MADE.

                               -------------------
                                TABLE OF CONTENTS
                                                                            PAGE
                                                                            ----
EXPENSE TABLE ..........................................................      2
FINANCIAL HIGHLIGHTS ...................................................      2
INTRODUCTION ...........................................................      4
INVESTMENT OBJECTIVES AND POLICIES .....................................      4
INVESTMENT LIMITATIONS .................................................      5
RISK FACTORS ...........................................................      6
YEAR 2000 ..............................................................      8
MANAGEMENT .............................................................      9
HOW TO PURCHASE SHARES .................................................     11
HOW TO REDEEM AND EXCHANGE SHARES ......................................     12
NET ASSET VALUE ........................................................     14
DIVIDENDS AND DISTRIBUTIONS ............................................     15
TAXES ..................................................................     15
MULTI-CLASS STRUCTURE ..................................................     16
DESCRIPTION OF SHARES ..................................................     16
OTHER INFORMATION ......................................................     17
                                                                   
INVESTMENT ADVISER
Boston Partners Asset Management, L.P.
Boston, Massachusetts

CUSTODIAN
PFPC Trust Company
Wilmington, Delaware

TRANSFER AGENT
PFPC Inc.
Wilmington, Delaware

DISTRIBUTOR
Provident Distributors, Inc.
West Conshohocken, Pennsylvania

COUNSEL
Drinker Biddle & Reath LLP
Philadelphia, Pennsylvania

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers LLP
Philadelphia, Pennsylvania

[LOGO GRAPHIC OMITTED]

<PAGE>
PROSPECTUS
DECEMBER 29, 1998
                                 BOSTON PARTNERS
                                    BOND FUND
                                (INVESTOR SHARES)

bp
BOSTON PARTNERS ASSET MANAGEMENT, L.P.
[LOGO GRAPHIC OMITTED]

<PAGE>

                            BOSTON PARTNERS BOND FUND
                                (INVESTOR CLASS)
                                       OF
                               THE RBB FUND, INC.

     Boston  Partners Bond Fund (the "Fund") is an  investment  portfolio of The
RBB Fund, Inc. ("RBB"), an open-end management investment company. The shares of
the Investor Class ("Shares") offered by this Prospectus  represent interests in
the Fund. The investment  objectives of the Fund are to maximize total return by
investing   principally  in  investment  grade  fixed  income  securities,   and
secondarily to seek current income.

     This Prospectus contains  information that a prospective  investor needs to
know before  investing.  Please  keep it for future  reference.  A Statement  of
Additional  Information,  dated  December  29,  1998,  has been  filed  with the
Securities  and Exchange  Commission  and is  incorporated  by reference in this
Prospectus.  It may be obtained  free of charge  from the Fund by calling  (888)
261-4073.  The  Prospectus  and the  Statement  of  Additional  Information  are
available for reference,  along with other related  material on the SEC Internet
Web Site (http://www.sec.gov).

SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY PNC BANK,  NATIONAL  ASSOCIATION, PFPC  TRUST COMPANY  OR ANY OTHER  BANK AND
SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT  INSURANCE  CORPORATION,
THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY. INVESTMENTS IN SHARES OF THE FUND
INVOLVE INVESTMENT RISKS, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.

- --------------------------------------------------------------------------------
THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THIS
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------

PROSPECTUS                                                     December 29, 1998
<PAGE>


EXPENSE TABLE
- --------------------------------------------------------------------------------
     The following table illustrates  annual operating  expenses incurred by the
Investor shares of the Fund (after fee waivers and expense  reimbursements)  for
the fiscal  period ended August 31, 1998 as a  percentage  of average  daily net
assets. An example based on the summary is also shown.

ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)

     Management Fees (after waivers)* .................................    0.00%

     12b-1 Fees .......................................................    0.25%

     Other Expenses (after waivers)* ..................................    0.60%
                                                                           ----
   Total Fund Operating Expenses (after waivers)* .....................    0.85%
                                                                           ====

*In the absence of fee waivers,  Management Fees would be 0.40%,  Other Expenses
would be 2.07% and Total Fund Operating Expenses would be 2.72%.

EXAMPLE

     An investor would pay the following  expenses on a $1,000 investment in the
Fund, assuming (1) a 5% annual return and (2) redemption at the end of each time
period:
                                        ONE        THREE       FIVE         TEN
                                       YEAR        YEARS       YEARS       YEARS
                                       ----        -----       -----       -----
     Boston Partners Bond Fund ......   $9         $27          $97        $105

     The Fee Table is  designed  to  assist an  investor  in  understanding  the
various  costs and expenses  that an investor in the Fund will bear  directly or
indirectly.  (For more complete  descriptions of the various costs and expenses,
see "Management"  and  "Distribution of Shares" below.) The Fee Table reflects a
voluntary  waiver of  "Management  fees" for the Fund which is expected to be in
effect  during  the  current  fiscal  year.  However,  the  Adviser  is under no
obligation  with respect to such waiver and there can be no  assurance  that any
future waivers of Management fees will not vary from the figure reflected in the
Fee Table.

     The Example in the Fee Table assumes that all  dividends and  distributions
are  reinvested  and  that the  amounts  listed  under  "Annual  Fund  Operating
Expenses"  remain  the  same in the  years  shown.  THE  EXAMPLE  SHOULD  NOT BE
CONSIDERED  A  REPRESENTATION  OF FUTURE  EXPENSES  AND ACTUAL  EXPENSES  MAY BE
GREATER OR LESS THAN THOSE SHOWN.

FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
     The "Financial  Highlights"  presented  below set forth certain  investment
results for shares of the Investor  Class of the Fund for the period  indicated.
Shares of the  Investor  Class were  first  issued on  December  30,  1998.  The
financial  data  included in this table should be read in  conjunction  with the
financial   statements  and  notes  thereto  and  the   unqualified   report  of
PricewaterhouseCoopers   LLP   ("PricewaterhouseCoopers"),   RBB's   independent
accountant, which are incorporated by reference into the Statement of Additional
Information.  Further information about the performance of the Investor Class of
the Fund is available in the Annual Report to  Shareholders.  Both the Statement
of Additional  Information and the Annual Report to Shareholders may be obtained
from the Fund free of charge by calling  the  telephone  number on page 1 of the
prospectus.

                                       2
<PAGE>

                            BOSTON PARTNERS BOND FUND
           (FOR AN INVESTOR SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

                                                                FOR THE PERIOD
                                                              DECEMBER 30, 1997*
                                                              THROUGH AUGUST 31,
                                                                     1998
                                                              ------------------
Per Share Operating Performance**
Net asset value, beginning of period ..........................     $ 10.00
                                                                    -------
Net investment income (1). ....................................        0.62
Net realized and unrealized gain/(loss) on investments(2) .....       (0.16)
                                                                    -------
Net increase in net assets resulting from operations. .........        0.46
                                                                    -------
DIVIDENDS TO SHAREHOLDERS FROM:
Net investment income. ........................................       (0.36)
Net realized capital gains ....................................          --
                                                                    -------
Net asset value, end of period ................................     $ 10.10
                                                                    =======
Total investment return(3) ....................................        4.63%
                                                                    =======
Ratios/Supplemental Data
   Net assets, end of period (000). ...........................     $198.00
   Ratio of expenses to average net assets***(1)(4). ..........        0.85%
   Ratio of net investment income to average net assets***(1) .        5.83%
   Portfolio turnover rate****. ...............................       45.27%

     *  Commencement of operations.
    **  Calculated based on shares  outstanding on the first and last day of the
        period, except for dividends and distributions,  if any, which are based
        on actual shares outstanding on the dates of distributions.
   ***  Annualized.
  ****  Not annualized.
  (1)   Reflects waivers and reimbursements.
  (2)   The amount shown for a share outstanding throughout the period is not in
        accord with the change in the aggregate  gains and losses in investments
        during the period because of the timing of sales and repurchases of Fund
        shares in relation to fluctuating net asset value during the period.
  (3)   Total  return is  calculated  assuming a purchase of shares on the first
        day and a sale of shares on the last day of the period reported and will
        include  reinvestments  of dividends and  distributions,  if any.  Total
        return is not annualized.
  (4)   Without the waiver of advisory, 12b-1, administration and transfer agent
        fees and without the  reimbursement of certain operating  expenses,  the
        ratio of expenses to average net assets  annualized for the period ended
        August 31, 1998 would have been 2.72% for the Investor Class.

INTRODUCTION
- --------------------------------------------------------------------------------
     RBB is an open-end  management  investment  company  incorporated under the
laws of the State of  Maryland  currently  operating  or  proposing  to  operate
seventeen separate investment portfolios.  The Shares offered by this Prospectus
represent  interests in the Boston  Partners Bond Fund. RBB was  incorporated in
Maryland on February 29, 1988.

                                       3
<PAGE>

INVESTMENT OBJECTIVES AND POLICIES
- --------------------------------------------------------------------------------
     The  investment  objectives  of the Fund are to  maximize  total  return by
investing   principally  in  investment  grade  fixed  income  securities,   and
secondarily to seek current income.

     The Fund will invest during  normal  market  conditions at least 75% of its
total assets in bonds,  including corporate debt obligations and mortgage-backed
and   asset-backed   securities   (collectively,    "Debt   Securities")   rated
investment-grade  or better at the time of purchase by Standard & Poor's ("S&P")
or Moody's Investors Service,  Inc.  ("Moody's") or which are similarly rated by
another  nationally   recognized   statistical  rating   organization   ("Rating
Organization")  (including Fitch IBCA, Duff & Phelps and Thomson BankWatch),  or
are unrated but deemed by Boston Partners Asset  Management L.P. (the "Adviser")
to be comparable in quality to instruments  so rated.  The Fund may invest up to
25% of its total assets in Debt Securities rated "BB" and "B" by Moody's or "Ba"
and "B" by S&P or which are similarly  rated by another Rating  Organization  or
are  unrated  but are  deemed by the  Adviser  to be  comparable  in  quality to
instruments that are so rated.

     Investment-grade  Debt  Securities  are those rated at the time of purchase
"AAA," "AA," "A" or "BBB" by S&P,  "Aaa," "Aa," "A" or "Baa" by Moody's or which
are similarly rated by another Rating  Organization or are unrated but deemed by
the Adviser to be comparable in quality to instruments  that are so rated.  Debt
Securities  rated  "BBB" by S&P,  "Baa" by Moody's or the  equivalent  rating of
another Rating Organization, while still deemed investment-grade, are considered
to have  speculative  characteristics  and are more sensitive to economic change
than higher rated bonds. Debt Securities rated below the four highest ratings of
S&P or Moody's are often  referred to as "junk bonds." Such Debt  Securities are
rated below investment-grade and carry a higher degree of risk and are regarded,
on  balance,  as  predominantly  speculative  with  respect to  capacity  to pay
interest and repay principal in accordance with the terms of the obligation. See
"Risk Factors -- Lower Rated Securities."

     The Adviser will select certain mortgage-backed and asset-backed securities
which it believes have superior risk/return  characteristics  versus other fixed
income instruments. Mortgage-backed securities represent pools of mortgage loans
assembled for sale to investors by various  governmental  agencies as well as by
private issuers.  Asset-backed  securities represent pools of other assets (such
as automobile  installment  purchase  obligations  and credit card  receivables)
similarly  assembled  for  sale  by  private  issuers.   See  "Risk  Factors  --
Mortgage-Backed and Asset-Backed  Securities" in this prospectus and "Investment
Objectives and Policies" in the Statement of Additional Information.

     The Fund may  also  invest  up to 15% of its  total  assets  in each of the
following:   collateralized   mortgage   obligations   ("CMOs"),   Yankee  Bonds
(dollar-denominated debt securities of foreign issuers),  non-dollar denominated
bonds of foreign or domestic issuers,  securities that can be purchased and sold
privately to institutional investors pursuant to Rule 144A, and convertible Debt
Securities of U.S. and foreign issuers  (including  convertible  preferred stock
and notes). See "Risk Factors" in this Prospectus and "Investment Objectives and
Policies" in the Statement of Additional Information.

     The Fund may invest in debt  securities  issued by the U.S.  Government  or
government agencies,  repurchase  agreements and reverse repurchase  agreements,
foreign currency exchange transactions,  dollar rolls, futures, option contracts
(including  options  on  futures)  and  stripped  securities.  The Fund may make
when-issued  purchases  and  forward  commitments.  See "Risk  Factors"  in this
Prospectus  and  "Investment  Objectives  and  Policies"  in  the  Statement  of
Additional Information.

     The Fund may invest in registered investment companies and investment funds
in foreign countries subject to the provisions of the Investment  Company Act of
1940, as amended (the "1940 Act"),  and as discussed in  "Investment  Objectives
and Policies" in the Statement of Additional Information. If the Fund invests in
such investment  companies,  the Fund will bear its  proportionate  share of the
costs incurred by such companies, including investment advisory fees.

     Although the Fund has no restriction as to the maximum or minimum  duration
of any  individual  security held by it, during  normal  market  conditions  the
Fund's average effective duration will generally be within 5% of the duration of
the  Lehman  Brothers  Aggregate  Bond  Index.  "Duration"  is a  term  used  by
investment managers to express the average time

                                       4
<PAGE>

to receipt of  expected  cash flows  (discounted  to their  present  value) on a
particular fixed income instrument or a portfolio of instruments. Duration takes
into account the pattern of a security's cash flow over time, including how cash
flow is affected by prepayments and changes in interest rates. For example,  the
duration  of a five-year  zero  coupon  bond that pays no interest or  principal
until the maturity of the bond is five years. This is because a zero coupon bond
produces no cash flow until the maturity  date. On the other hand, a coupon bond
that pays interest  semi-annually and matures in five years will have a duration
of less than five years,  which reflects the  semi-annual  cash flows  resulting
from coupon  payments.  Duration also  generally  defines the effect of interest
rate  changes on bond  prices.  Generally,  if  interest  rates  increase by one
percent,  the value of a security  having an  effective  duration  of five years
would decrease in value by five percent.

     The  Fund's  investment  objectives  and  policies  described  above may be
changed  by  RBB's  Board  of  Directors  without  the  approval  of the  Fund's
shareholders.

INVESTMENT LIMITATIONS
- --------------------------------------------------------------------------------
     The  Fund may not  change  the  following  investment  limitations  without
shareholder approval. (A complete list of the investment limitations that cannot
be changed without such a vote of the shareholders is contained in the Statement
of Additional Information under "Investment Objectives and Policies.")

     The Fund may not:

         1.  Purchase the  securities of any one issuer,  other than  securities
     issued  or   guaranteed   by  the  U.S.   Government  or  its  agencies  or
     instrumentalities,  if immediately  after and as a result of such purchase,
     more than 5% of the value of the Fund's  total  assets would be invested in
     the securities of such issuer,  or more than 10% of the outstanding  voting
     securities of such issuer would be owned by the Fund, except that up to 25%
     of the value of the Fund's total assets may be invested  without  regard to
     such limitations.

         2. Purchase any securities  which would cause, at the time of purchase,
     25% or more of the value of the total  assets of the Fund to be invested in
     the obligations of issuers in any single  industry,  provided that there is
     no limitation with respect to investments in U.S. Government obligations.

         3. Borrow  money or issue senior  securities,  except that the Fund may
     borrow from banks and enter into reverse  repurchase  agreements and dollar
     rolls for temporary purposes in amounts up to one-third of the value of its
     total  assets  at the  time of  such  borrowing;  or  mortgage,  pledge  or
     hypothecate  any assets,  except in connection  with any such borrowing and
     then in amounts not in excess of one-third of the value of the Fund's total
     assets at the time of such borrowing. The Fund will not purchase securities
     while its aggregate  borrowings  (including reverse repurchase  agreements,
     dollar  rolls and  borrowings  from banks) are in excess of 5% of its total
     assets.  Securities held in escrow or separate  accounts in connection with
     the Fund's  investment  practices  are not  considered  to be borrowings or
     deemed to be pledged for purposes of this limitation.

     If a percentage  restriction under one of the Fund's investment policies or
restrictions  or the use of assets is  adhered to at the time a  transaction  is
effected, later changes in percentage resulting from changing values will not be
considered a violation  (except with respect to any restrictions  that may apply
to borrowings or senior securities issued by the Fund).

PORTFOLIO TURNOVER

     The Fund retains the right to sell securities irrespective of how long they
have been held. The Adviser  estimates that the annual turnover in the Fund will
be  approximately  100%.  High portfolio  turnover (100% or more) will generally
result  in  higher  transaction  costs  to a  portfolio  and may  result  in the
realization  of  short-term  capital gains that are taxable to  shareholders  as
ordinary income.

                                       5
<PAGE>


RISK FACTORS
- --------------------------------------------------------------------------------

INTEREST RATE RISK

     Generally,  the  market  value of fixed  income  securities  is  subject to
interest rate  fluctuation  and can be expected to vary  inversely to changes in
the prevailing interest rates. Thus, the value of portfolio  investments held by
the Fund is likely to decline if prevailing interest rates rise, and vice versa.

LOWER RATED SECURITIES

     Investors should carefully  consider the relative risks of investing in the
higher  yielding  (and,  therefore,  higher  risk) debt  securities  rated below
investment-grade  by S&P or  Moody's,  or which are  similarly  rated by another
Rating Organization or are unrated but deemed by the Adviser to be comparable to
instruments so rated.

     The Fund's  investments in obligations rated below the four highest ratings
of S&P and Moody's have different risks than  investments in securities that are
rated  "investment-grade."  Risk  of  loss  upon  default  by  the  borrower  is
significantly greater because lower-rated securities are generally unsecured and
are often subordinated to other creditors of the issuer, and because the issuers
frequently  have high levels of  indebtedness  and are more sensitive to adverse
economic conditions,  such as recessions,  individual corporate developments and
increasing  interest rates than are  investment-grade  issuers. As a result, the
market price of such  securities,  and the net asset value of the Fund's Shares,
may be particularly volatile.

     Additional risks associated with  lower-rated  fixed income  securities are
(a) the relatively  low trading market  liquidity for the securities and (b) the
creditworthiness of the issuers of such securities.  During an economic downturn
or substantial  period of rising  interest rates,  highly-leveraged  issuers may
experience financial stress that would adversely affect their ability to service
their principal and interest  payment  obligations,  to meet projected  business
goals and to obtain  additional  financing.  An  economic  downturn  could  also
disrupt the market for  lower-rated  bonds  generally and  adversely  affect the
value of outstanding bonds and the ability of the issuers to repay principal and
interest.  If the issuer of a lower-rated  security held by the Fund  defaulted,
the Fund could incur additional expenses to seek recovery. Adverse publicity and
investor  perceptions,  whether or not based on fundamental  analysis,  may also
decrease the values and liquidity of  lower-rated  securities  held by the Fund,
especially  in a thinly  traded  market.  Finally,  the Fund's  trading in fixed
income  securities  entails  risks that  capital  losses  rather than gains will
result. As a result,  investment in the Fund should not be considered a complete
investment program.

     The  Adviser  will  continually  evaluate  lower-rated  securities  and the
ability of their issuers to pay interest and  principal.  The Fund's  ability to
achieve its investment  objectives may be more dependent on the Adviser's credit
analysis  than  might be the case  for a fund  that  invested  in  higher  rated
securities.  See the "Appendix" in the Statement of Additional Information for a
general description of securities ratings.

MORTGAGE-BACKED AND ASSET-BACKED SECURITIES

     Mortgage-backed  securities,  like other fixed income  instruments,  may be
subject to risks, including price fluctuations due to interest rate changes. The
returns on mortgage-backed securities may also be negatively affected by changes
in principal pre-payment rates due to interest rate volatility.

     Mortgage-related securities acquired by the Fund may include collateralized
mortgage  obligations  ("CMOs"),  a type of  derivative,  issued by the  Federal
National  Mortgage  Association,  the Federal  Home Loan  Mortgage  Corporation,
Government  National Mortgage  Association or other U.S.  Government agencies or
instrumentalities,  as well as by private issuers.  CMOs may involve  additional
risks other than those found in other types of  mortgage-related  obligations in
that they may exhibit more price  volatility  and  interest  rate risk than such
obligations.  During  periods  of rising  interest  rates,  CMOs may lose  their
liquidity as CMO market makers may choose not to repurchase, or may offer prices
based on current

                                       6
<PAGE>

market conditions, which are unacceptable to a fund based on the fund's analysis
of the market value of the security. See "Investment Objectives and Policies" in
the Statement of Additional Information.

     Asset-backed securities are also subject to declines in market value during
periods of rising  interest  rates.  Due to the possibility of prepayment of the
underlying obligations,  asset-backed securities have less potential for capital
appreciation than other debt securities of comparable  maturities during periods
of declining  interest rates. As a result,  asset-backed  securities may be less
effective than other fixed income securities as a means of locking in attractive
interest rates for the long term.

REVERSE REPURCHASE AGREEMENTS AND DOLLAR ROLLS

     The Fund may enter  into  reverse  repurchase  agreements  with  respect to
portfolio  securities  for  temporary  purposes  (such as to obtain cash to meet
redemption  requests)  when the  liquidation  of portfolio  securities is deemed
disadvantageous or inconvenient by the Adviser.  Reverse  repurchase  agreements
involve the sale of securities held by the Fund pursuant to the Fund's agreement
to repurchase the securities at an agreed-upon price, date and rate of interest.
Such agreements are considered to be borrowings under the Investment Company Act
of 1940  (the  "1940  Act"),  and may be  entered  into  only for  temporary  or
emergency purposes.  While reverse repurchase transactions are outstanding,  the
Fund will  maintain  in a  segregated  account  with the Fund's  Custodian  or a
qualified  sub-custodian,  cash or liquid securities of an amount at least equal
to the market value of the  securities,  plus accrued  interest,  subject to the
agreement and will monitor the account to ensure that such value is  maintained.
Reverse  repurchase  agreements  involve  the risk that the market  value of the
securities  sold by the Fund may decline below the price of the  securities  the
Fund is obligated to repurchase. The Fund may also enter into "dollar rolls," in
which it sells fixed income  securities  for  delivery in the current  month and
simultaneously  contracts to repurchase substantially similar (same type, coupon
and maturity) securities on a specified future date. During the roll period, the
Fund would forgo principal and interest paid on such securities.  The Fund would
be compensated by the difference between the current sales price and the forward
price for the future  purchase,  as well as by the  interest  earned on the cash
proceeds of the initial sale.

FOREIGN SECURITIES RISK

     The Fund may invest in foreign securities, as described above. Investing in
securities of foreign issuers involves  considerations not typically  associated
with investing in securities of companies  organized and operating in the United
States.  Foreign  securities  generally  are  denominated  and pay  dividends or
interest  in  foreign  currencies.  The Fund may hold from time to time  various
foreign  currencies  pending  their  investment  in foreign  securities or their
conversion into U.S. dollars. The value of the assets of the Fund as measured in
U.S.  dollars may therefore be affected  favorably or  unfavorably by changes in
exchange  rates.  There may be less publicly  available  information  concerning
foreign  issuers  than  is  available  with  respect  to U.S.  issuers.  Foreign
securities  may  not  be  registered  with  the  U.S.  Securities  and  Exchange
Commission,  and  generally,  foreign  companies  are  not  subject  to  uniform
accounting,  auditing and financial reporting  requirements  comparable to those
applicable to U.S. issuers.  See "Investment  Objectives and Policies -- Foreign
Securities" in the Statement of Additional Information.

FOREIGN CURRENCY EXCHANGE TRANSACTIONS

     Because  the Fund may buy and sell  securities  denominated  in  currencies
other than the U.S.  dollar,  and may  receive  interest  and sale  proceeds  in
currencies other than the U.S. dollar, the Fund from time to time may enter into
foreign  currency  exchange  transactions  to convert the U.S. dollar to foreign
currencies,  to convert  foreign  currencies  to the U.S.  dollar and to convert
foreign  currencies  to  other  foreign  currencies.  Forward  foreign  currency
exchange  contracts  are  agreements to exchange one currency for another -- for
example,  to exchange a certain  amount of U.S.  dollars for a certain amount of
Japanese yen -- at a future date and at a specified price.

                                       7
<PAGE>

     Typically,  the  other  party to a  currency  exchange  contract  will be a
commercial bank or other financial institution.  A fund either enters into these
transactions  on a spot (i.e.,  cash) basis at the spot rate  prevailing  in the
foreign currency  exchange market, or uses forward contracts to purchase or sell
foreign currencies.

     Forward foreign  currency  exchange  contracts also allow the Fund to hedge
the currency risk of portfolio  securities  denominated  in a foreign  currency.
This  technique  permits  the  assessment  of the  merits  of a  security  to be
considered  separately  from the currency  risk. By separating the asset and the
currency decision, it is possible to focus on the opportunities presented by the
security  apart  from the  currency  risk.  Although  forward  foreign  currency
exchange  contracts  are of short  duration,  generally  between  one and twelve
months,  the forward foreign  currency  exchange  contracts are rolled over in a
manner consistent with a more long-term  currency  decision.  There is a risk of
loss to the Fund if the other party does not complete the transaction.

EUROPEAN CURRENCY UNIFICATION

     Many European countries are about to adopt a single European currency,  the
euro.  On January 1, 1999,  the euro will become legal tender for all  countries
participating in the Economic and Monetary Union ("EMU"). A new European Central
Bank will be created to manage the monetary policy of the new unified region. On
the same date,  the exchange  rates will be  irrevocably  fixed  between the EMU
member countries.  National currencies will continue to circulate until they are
replaced by euro coins and bank notes by the middle of 2002.

     This change is likely to significantly  impact the European capital markets
in which the Fund may invest and may result in the Fund facing  additional risks
in pursuing its investment  objective.  These risks, which include,  but are not
limited  to,  uncertainty  as to  the  proper  tax  treatment  of  the  currency
conversion, volatility of currency exchange rates as a result of the conversion,
uncertainty  as to capital  market  reaction,  conversion  costs that may affect
issuer  profitability  and  creditworthiness,  and lack of participation by some
European  countries,  may increase the  volatility of the Fund's net asset value
per share.

WHEN-ISSUED PURCHASES AND FORWARD COMMITMENTS

     The Fund may  purchase  securities  on a  when-issued  basis or enter  into
forward commitment transactions.  When the Fund agrees to purchase securities on
a when-issued basis or enters into a forward commitment to purchase  securities,
the Custodian will set aside cash,  U.S.  Government  securities or other liquid
assets  equal to the  amount of the  purchase  or the  commitment  in a separate
account.  As a result,  the Fund's liquidity and ability to manage its portfolio
might be affected in the event its when-issued  purchases or forward commitments
ever  exceeded  25% of the  value  of its  assets.  In  the  case  of a  forward
commitment to sell portfolio  securities,  the Custodian will hold the portfolio
securities in a segregated account while the commitment is outstanding. When the
Fund engages in when-issued and forward  commitment  transactions,  it relies on
the other  party to  consummate  the  trade.  Failure of such party to do so may
result in the Fund  incurring a loss or missing an opportunity to obtain a price
considered to be advantageous.

YEAR 2000
- --------------------------------------------------------------------------------
     Like  other  mutual  funds,   financial  and  business   organizations  and
individuals  around  the  world,  the Fund could be  adversely  affected  if the
computer systems used by the Adviser and the Fund's other service providers,  or
persons with whom they deal, do not properly process and calculate  date-related
information  and data  from and after  January  1,  2000.  This  possibility  is
commonly known as the "Year 2000 Problem." The Year 2000 Problem could also hurt
companies whose securities the Fund holds or securities markets  generally.  The
Fund has been advised by the Adviser,  the Administrators and the Custodian that
they are actively  taking steps to address the Year 2000 Problem with respect to
the computer  systems  that they use and to obtain  assurances  that  comparable
steps are being taken by the Fund's other major service  providers.  While there
can be no  assurance  that  the  Fund's  service  providers  will be  Year  2000
compliant,  the Fund's service providers expect that their plans to be compliant
will be achieved.

                                       8
<PAGE>

ASSET ALLOCATION

     From time to time, the Fund may experience  relatively  large  purchases or
redemptions  due to asset  allocation  decisions made by the Adviser for clients
receiving Asset Allocation account management services involving  investments in
the Fund.  These  transactions  may have a  material  effect on the Fund,  since
redemptions  caused by  reallocations  may result in the Fund selling  portfolio
securities,  and  purchases  caused  by  reallocations  may  result  in the Fund
receiving additional cash that it will have to invest. While it is impossible to
predict  the  overall  impact of these  transactions  over time,  there could be
adverse  effects on  portfolio  management  to the  extent  that the Fund may be
required  to sell  securities  at times  when it would not  otherwise  do so, or
receive  cash  that  cannot  be  invested  in  an  expeditious   manner.   These
transactions  could also have tax consequences if the sale of securities results
in gains and could also increase  transaction costs. The Advisor is committed to
minimizing  the  impact  or such  transactions  on the Fund to the  extent it is
consistent  with  pursuing the  investment  objectives  of clients for which the
Advisor  provides  Asset  Allocation  account   management   services  involving
investments in the Fund and monitors the impact of asset allocation decisions on
the Fund.

GENERAL

     The Fund's use of certain  investment  techniques,  including  derivatives,
options and futures  transactions,  will  subject the Fund to greater  risk than
Funds that do not employ such techniques.

     Investment  methods  described in this Prospectus are among those which the
Fund has the power to utilize.  Some may be employed on a regular basis;  others
may not be used at all.  Accordingly,  reference  to any  particular  method  or
technique  carries no implication that it will be utilized or, if it is, that it
will be successful.

MANAGEMENT
- --------------------------------------------------------------------------------

BOARD OF DIRECTORS

     The  business  and  affairs  of RBB and the  Fund  are  managed  under  the
direction of RBB's Board of Directors.

INVESTMENT ADVISER

     Boston Partners Asset Management,  L.P.,  located at 28 State Street,  21st
Floor, Boston, Massachusetts 02109, serves as the Fund's investment adviser. The
Adviser  provides  investment  management  and investment  advisory  services to
investment  companies and other institutional  accounts that had aggregate total
assets under  management as of October 31, 1998 in excess of $16.0 billion.  The
adviser  is  organized  as a Delaware  limited  partnership  whose sole  general
partner is Boston Partners, Inc., a Delaware corporation.

     Subject to the supervision  and direction of RBB's Board of Directors,  the
Adviser manages the Fund's  portfolio in accordance  with the Fund's  investment
objectives and policies,  makes investment decisions for the Fund, places orders
to purchase and sell securities, and employs professional portfolio managers and
securities  analysts who provide research services to the Fund. For its services
to the Fund,  the Adviser is paid an advisory  fee computed at an annual rate of
0.40% of the Fund's average daily net assets, which is calculated daily and paid
monthly.  The Adviser has notified RBB, however,  that it intends to limit total
Fund operating expenses to 0.85% during the Fund's current fiscal year.

PORTFOLIO MANAGEMENT

     The day-to-day  portfolio  management of the Fund is the  responsibility of
William R. Leach who is a senior  portfolio  manager of the Adviser and Chairman
of the Fixed Income  Strategy  Committee.  Prior to joining the Adviser in April
1995, Mr. Leach was employed by The Boston Company Asset Management,  Inc. ("The
Boston  Company")  from 1988 through April 1995 where he was a senior  portfolio
manager and Director of the Fixed Income Strategy Committee.  Mr. Leach has over
16 years of investment  experience and is a Chartered Financial Analyst ("CFA").
Mr. Leach will be assisted by Glenn S. Davis,  Joseph F. Feeney, Jr. and Michael
A. Mullaney. Mr. Davis is a Fixed Income Portfolio Manager with the Adviser

                                       9
<PAGE>

and is also a CFA.  Prior to  joining  the  Adviser in April  1995,  he was Vice
President and Portfolio Manager at The Boston Company, specializing in short and
intermediate  term corporate bonds.  Prior to that position,  he was responsible
for the Short-term Fixed Income Group at State Street Global Advisors.  He has a
total  of 17  years of  investment  experience.  Mr.  Feeney  is a Fixed  Income
Portfolio  Manager with the Adviser and also a CFA. Prior to joining the Adviser
in April 1995, he was Assistant  Vice President and  Mortgage-backed  Securities
Portfolio  Manager  for  Putnam  Investments.  Mr.  Mullaney  is a Fixed  Income
Portfolio Manager who joined the Adviser in June 1997. From 1984 to 1997, he was
employed at Putnam  Investments,  most recently as Managing  Director and Senior
Investment  Strategist,  specializing in portfolio strategy and management.  His
prior  experience  included a position as a senior  Consultant from 1981 to 1983
with  Chase  Econometrics/Interactive  Data  Corporation,  where he  focused  on
quantitative methodologies in fixed income and equity management. He has over 16
years of investment experience.

ADMINISTRATOR

     PFPC  Inc.  ("PFPC")  serves  as  administrator  to the Fund and  generally
assists the Fund in all aspects of its administration and operations,  including
matters relating to the maintenance of financial records and accounting.  PFPC's
principal  offices are located at 400  Bellevue  Parkway,  Wilmington,  Delaware
19809.  For its services,  PFPC  receives a fee  calculated at an annual rate of
 .125% of the  Fund's  average  daily net  assets  with a minimum  annual  fee of
$75,000 payable monthly on a pro rata basis.

TRANSFER AGENT, DIVIDEND DISBURSING AGENT, AND CUSTODIAN

     PFPC Trust Company, an indirect wholly-owned  subsidiary of PNC Bank Corp.,
will succeed PNC Bank, National Association ("PNC Bank") as the Fund's custodian
pursuant to an assignment. PNC Bank will continue to provide certain services to
PFPC Trust  Company.  PFPC  serves as the  Fund's  transfer  agent and  dividend
disbursing  agent.  The  principal  offices of PFPC are located at 400  Bellevue
Parkway,  Wilmington,  Delaware 19809. PFPC may enter into shareholder servicing
agreements  with  registered   broker-dealers   who  have  entered  into  dealer
agreements  with the  Distributor  ("Authorized  Dealers")  for the provision of
certain shareholder support services to customers of such Authorized Dealers who
are shareholders of the Fund. The services  provided and the fees payable by the
Fund for these services are described in the Statement of Additional Information
under "Investment Advisory, Distribution and Servicing Arrangements."

DISTRIBUTOR

     Provident  Distributors,  Inc. ("PDI"), whose principal business address is
Four Falls Corporate  Center,  West  Conshohocken,  Pennsylvania  19428, acts as
distributor   for  the  Shares   pursuant  to  a  distribution   agreement  (the
"Distribution Agreement") with RBB on behalf of the Shares.

EXPENSES

     The  expenses  of the  Fund  are  deducted  from its  total  income  before
dividends are paid. These expenses include, but are not limited to: fees paid to
the Adviser  and PFPC;  distribution  fees;  fees and  expenses of officers  and
directors  who  are  not  affiliated  with  any of  RBB's  investment  advisers,
sub-advisers or the Distributor;  taxes;  interest;  legal fees; custodian fees;
auditing fees; brokerage fees and commissions;  certain of the fees and expenses
of registering  and qualifying  the Fund and the Shares for  distribution  under
federal and state  securities  laws;  expenses  of  preparing  prospectuses  and
statements  of  additional  information  and of printing and  distributing  them
annually to existing  shareholders  that are not  attributable  to a  particular
class of shares of RBB;  the expense of reports to  shareholders,  shareholders'
meetings and proxy solicitations that are not attributable to a particular class
of shares of RBB; fidelity bond and directors and officers  liability  insurance
premiums;  the expense of using independent pricing services; and other expenses
that are not  expressly  assumed by the Adviser  under its  investment  advisory
agreement  with  respect to the Fund.  Any general  expenses of RBB that are not
readily  identifiable as belonging to a particular  investment  portfolio of RBB
will be allocated among all investment portfolios of RBB based upon the relative
net assets of the investment portfolios.  Distribution expenses, transfer agency
expenses,  expenses of  preparation,  printing  and  distributing  prospectuses,
statements of additional information,

                                       10
<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>

     BOSTON PARTNERS BOND FUND            bp
        (INVESTOR CLASS)                  BOSTON PARTNERS ASSET MANAGEMENT, L.P.

ACCOUNT APPLICATION
PLEASE NOTE:  Do not use this form to open a retirement plan account.  For an
IRA application or help with this Application, please call 1-888-261-4073

1              (Please check the appropriate box(es) below.)
Account
Registration:  / /  Individual           / /  Joint Tenant           / /  Other

               _________________________________________________________________
               NAME          SOCIAL SECURITY NUMBER OR TAX ID# OF PRIMARY OWNER
                                                                
               _________________________________________________________________
               NAME OF JOINT OWNER        JOINT OWNER SOCIAL SECURITY NUMBER OR
                                          TAX ID#                    

               For joint accounts, the account registrants will be joint tenants
               with right of survivorship and not tenants in common unless
               tenants in common or community property registrations are
               requested.

GIFT TO MINOR: / /  Uniform Gifts/Transfer to Minor's Act

               _________________________________________________________________
               NAME OF ADULT CUSTODIAN (ONLY ONE PERMITTED)

               _________________________________________________________________
               NAME OF MINOR (ONLY ONE PERMITTED)

               _________________________________________________________________
               MINOR'S SOCIAL SECURITY NUMBER AND DATE OF BIRTH

CORPORATION,
PARTNERSHIP,
TRUST OR
OTHER ENTITY:  _________________________________________________________________
               NAME OF CORPORATION, PARTNERSHIP,           NAME(S) OF TRUSTEE(S)
               OR OTHER

               _________________________________________________________________
               TAXPAYER IDENTIFICATION NUMBER

               _________________________________________________________________
2              STREET OR P.O. BOX AND/OR APARTMENT NUMBER
Mailing
Address:       _________________________________________________________________
               CITY                          STATE                     ZIP CODE

               _________________________________________________________________
               DAY PHONE NUMBER              EVENING PHONE NUMBER

3              Minimum initial investment     Amount of investment $____________
Investment     of $2,500.
Information:

               Make the check payable to Boston Partners Bond Fund.

               Shareholders may not purchase shares of this Fund with a check
               issued by a third party and endorsed over to the Fund.

               NOTE: Dividends and capital gains may be reinvested or paid by
               check. If no options are selected below, both dividends and
               capital gains will be reinvested in additional Fund shares.

DISTRIBUTION
OPTIONS:

               DIVIDENDS:   Pay by check / /    Reinvest / /     
               CAPITAL GAINS:  Pay by check / /     Reinvest / / 


               To select this portion please fill out the information below:

               Amount_______________         Startup Month__________________

SYSTEMATIC
WITHDRAWAL     Frequency Options:  Annually / /     Monthly / /    Quarterly / /
PLAN:
<PAGE>

               -    A minimum account value of $10,000 in a single account is 
                    required to establish a Systematic Withdrawal Plan.

               -    Payments will be made on or near the 25th of the month.

               Please check one of the following options:

                    _____   Please mail checks to Address of Record (Named in
                            Section 2)
                    _____   Please electronically credit my Bank of Record
                            (Named in Section 5)

4               To use this option, you must initial the appropriate line below.
Telephone
Redemption     I authorize the Transfer Agent to accept instructions from any
or Exchange:   persons to redeem or exchange shares in my account(s) by
               telephone in accordance with the procedures and conditions set
               forth in the Fund's current prospectus.

                ______________________  _________________ Redeem shares, and 
                  individual initial      joint initial   send the proceeds to
                                                          the address of record.


                ______________________  _________________ Exchange shares for
                 individual initial       joint initial   shares of The Boston 
                                                          Partners Large Cap 
                                                          Value Fund, Mid Cap 
                                                          Value Fund, Micro Cap
                                                          Value Fund or Market
                                                          Neutral Fund.


5              The Automatic Investment Plan which is available to shareholders 
Automatic      of the Fund, makes possible regularly scheduled purchases of Fund
Investment     shares to allow dollar-cost averaging. The Fund's Transfer Agent 
Plan:          can arrange for an amount of money selected by you to be deducted
               from your checking account and used to purchase shares of the 
               Fund.

               Please debit $________ from my checking account (named below) on
               or about the 20th of the month. PLEASE ATTACH AN UNSIGNED, VOIDED
               CHECK.

               / /  Monthly     / /  Every Alternate Month     / /  Quarterly
               / /  Other

BANK OF        _________________________________________________________________
RECORD:        BANK NAME                         STREET ADDRESS OR P.O. BOX

               _________________________________________________________________
               CITY                   STATE                        ZIP CODE

               _________________________________________________________________
               BANK ABA NUMBER                          BANK ACCOUNT NUMBER


6              The undersigned warrants that I (we) have full authority and, if 
Signatures:    a natural person, I (we) am (are) of legal age to purchase shares
               pursuant to this Account Application, and I (we) have received a 
               current prospectus for the Fund in which I (we) am (are)         
               investing.                                                       
                                                                                
               Under the Interest and Dividend Tax Compliance Act of 1983, the
               Fund is required to have the following certification:

               Under penalties of perjury, I certify that:

               (1)      The number shown on this form is my correct
                        identification number (or I am waiting for a number 
                        to be issued to me), and

               (2)      I am not subject to backup withholding
                        because (a) I am exempt from backup
                        withholding, or (b) I have not been notified
                        by the Internal Revenue Service that I am
                        subject to 31% backup withholding as a
                        result of a failure to report all Interest
                        or dividends, or (c) the IRS has notified me
                        that I am no longer subject to backup
                        withholding.

               NOTE: YOU MUST CROSS OUT ITEM (2) ABOVE IF YOU HAVE BEEN NOTIFIED
               BY THE IRS THAT YOU ARE CURRENTLY SUBJECT TO BACKUP WITHHOLDING
               BECAUSE YOU HAVE FAILED TO REPORT ALL INTEREST AND DIVIDENDS ON
               YOUR TAX RETURN. THE INTERNAL REVENUE SERVICE DOES NOT REQUIRE
               YOUR CONSENT TO ANY PROVISION OF THIS DOCUMENT OTHER THAN THE
               CERTIFICATION REQUIRED TO AUDIT BACKUP WITHHOLDING.

              _________________________________________________________________
               SIGNATURE OF APPLICANT                              DATE

               _________________________________________________________________
               PRINT NAME                                 TITLE (IF APPLICABLE)

               _________________________________________________________________
               SIGNATURE OF JOINT OWNER                            DATE

               _________________________________________________________________
               PRINT NAME                                 TITLE (IF APPLICABLE)


               (If you are signing for a corporation, you must indicate
               corporate office or title. If you wish additional signatories on
               the account, please include a corporate resolution. If signing as
               a fiduciary, you must indicate capacity.)

               For information on additional options, such as IRA Applications,
               rollover requests for qualified retirement plans, or for wire
               instructions, please call us at 1-888-261-4073.

               MAIL COMPLETED ACCOUNT APPLICATION AND CHECK TO:        
                                                                       
                            THE BOSTON PARTNERS BOND FUND             
                            C/O PFPC INC.                                      
                            P.O. BOX 8852                          
                            WILMINGTON, DE  19899-8852             

<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>

proxy statements and reports to shareholders,  and registration fees, identified
as belonging to a particular class, are allocated to such class.

     The  Adviser  may  assume  expenses  of the Fund from time to time.  To the
extent any service  providers  assume  expenses of the Fund,  such assumption of
expenses will have the effect of lowering the Fund's  overall  expense ratio and
increasing its yield to investors.

DISTRIBUTION OF SHARES
- --------------------------------------------------------------------------------
     The Board of Directors of RBB approved and adopted a Distribution Agreement
and Plan of  Distribution  for the Shares  (the  "Plan")  pursuant to Rule 12b-1
under the 1940 Act. Under the Plan, the  Distributor is entitled to receive from
the Fund a distribution  fee, which is accrued daily and paid monthly,  of up to
0.25% on an annualized  basis of the average  daily net assets of the Fund.  The
actual amount of such compensation  under the Plan is agreed upon by RBB's Board
of  Directors  and  by  the  Distributor  in  the  Distribution  Agreement.  The
Distributor may, in its discretion,  from time to time waive  voluntarily all or
any portion of its distribution fee.

     Amounts  paid  to  the  Distributor  under  the  Plan  may be  used  by the
Distributor  to cover  expenses  that are  related  to (i) the sale of  Investor
Shares of the Fund, (ii) ongoing servicing and/or maintenance of the accounts of
shareholders of the Fund, and (iii) sub-transfer agency services,  subaccounting
services or  administrative  services related to the sale of the Investor Shares
of the Fund, all as set forth in the Plan. The  Distributor may delegate some or
all of these  functions  to  Service  Agents.  See "How to  Purchase  Shares  --
Purchases Through Intermediaries."

     The Plan obligates the Fund,  during the period it is in effect,  to accrue
and pay to the  Distributor  on behalf  of the Fund the fee  agreed to under the
Distribution Plan.  Payments under the Plan are not tied exclusively to expenses
actually incurred by the Distributor,  and the payments may exceed  distribution
expenses actually incurred.

PURCHASES THROUGH INTERMEDIARIES

     Shares  of the Fund  may be  available  through  various  brokerage  firms,
financial  institutions and programs  sponsored by other industry  professionals
(collectively, "Service Organizations"). Certain features of the Shares, such as
the initial and subsequent investment minimums and certain trading restrictions,
may be modified or waived by Service  Organizations.  Service  Organizations may
impose transaction or administrative charges or other direct fees, which charges
or fees would not be imposed if Fund  Shares  are  purchased  directly  from the
Fund.  Therefore,  a client or customer should contact the Service  Organization
acting on his behalf  concerning the fees (if any) charged in connection  with a
purchase or redemption  of Fund Shares and should read this  Prospectus in light
of the terms  governing  his  accounts  with the Service  Organization.  Service
Organizations will be responsible for promptly  transmitting  client or customer
purchase and redemption  orders to the Fund in accordance with their  agreements
with  clients  or  customers.  Service  Organizations  that  have  entered  into
agreements  with the Fund or its agent may enter  confirmed  purchase  orders on
behalf of clients and customers, with payment to follow no later than the Fund's
pricing on the following  Business Day. If payment is not received by such time,
the Service Organization could be held liable for resulting fees or losses.

     For administration,  subaccounting,  transfer agency and/or other services,
the Adviser or the Distributor or their affiliates may pay Service Organizations
and  certain  recordkeeping  organizations  with  whom they  have  entered  into
agreements a fee of up to .35% (the "Service  Fee") of the average  annual value
of  accounts  with  the  Fund  maintained  by  such  Service   Organizations  or
recordkeepers.  The  Service  Fee  payable to any one  Service  Organization  or
recordkeeper is determined based upon a number of factors,  including the nature
and quality of the services provided, the operations processing  requirements of
the relationship  and the standardized fee schedule of the Service  Organization
or recordkeeper. The Adviser, the Distributor or either of their affiliates may,
at their own expense,  provide promotional  incentives for qualified  recipients
who support the sale of Shares  consisting of  securities  dealers who have sold
Fund Shares or others,  including banks and other financial institutions,  under
special arrangements. Incentives may include opportunities to attend business

                                       11
<PAGE>

meetings,  conferences, sales or training programs for recipients,  employees or
clients  and other  programs  or events and may also  include  opportunities  to
participate in advertising or sales campaigns  and/or  shareholder  services and
programs regarding one or more Boston Partners Funds.  Travel, meals and lodging
may  also be paid in  connection  with  these  promotional  activities.  In some
instances,  these incentives may be offered only to certain  institutions  whose
representatives provide services in connection with the sale or expected sale of
significant amounts of Fund Shares.

HOW TO PURCHASE SHARES
- --------------------------------------------------------------------------------

GENERAL

     Shares representing interests in the Fund are offered continuously for sale
by the  Distributor and may be purchased  without  imposition of a sales charge.
Shares may be purchased initially by completing the application included in this
Prospectus and forwarding the application to the Fund's  transfer  agent,  PFPC.
Purchases  of Shares may be  effected by wire to an account to be  specified  by
PFPC or by mailing a check or  Federal  Reserve  Draft,  payable to the order of
"The  Boston  Partners  Bond Fund" c/o PFPC  Inc.,  P.O.  Box 8852,  Wilmington,
Delaware 19899-8852.  The name of the Fund, Boston Partners Bond Fund, must also
appear on the check or Federal  Reserve  Draft.  Shareholders  may not  purchase
shares of the Boston Partners Bond Fund with a check issued by a third party and
endorsed  over to the fund.  Federal  Reserve  Drafts are  available at national
banks or any state bank which is a member of the Federal Reserve System. Initial
investments in the Fund must be at least $2,500 and subsequent  investments must
be at least $100.  The Fund reserves the right to suspend the offering of Shares
for a period of time or to reject any purchase order.

     Shares may be purchased on any  Business  Day. A "Business  Day" is any day
that the New York Stock  Exchange (the "NYSE") is open for business.  Currently,
the NYSE is closed on weekends and New Year's Day, Dr. Martin  Luther King,  Jr.
Day,  Presidents' Day, Good Friday,  Memorial Day,  Independence Day, Labor Day,
Thanksgiving  Day and Christmas  Day and on the  preceding  Friday or subsequent
Monday when one of these holidays falls on a Saturday or Sunday.

     The price paid for Shares  purchased  initially  or  acquired  through  the
exercise of an exchange  privilege is based on the net asset value next computed
after a purchase  order is  received  in good  order by the Fund or its  agents.
Orders  received by the Fund or its agents after the close of regular trading on
the New York Stock Exchange, Inc. (currently 4:00 p.m., Eastern time) are priced
at the net asset value next  determined on the following  business day. In those
cases where an investor pays for Shares by check,  the purchase will be effected
at the net asset value next determined after the Fund or its agents receives the
order and the completed application.

     Provided  that the  investment  is at least  $2,500,  an investor  may also
purchase  Shares by having his bank or his broker wire Federal Funds to PFPC. An
investor's  bank or broker may impose a charge for this  service.  The Fund does
not currently  impose a service charge for effecting wire transfers but reserves
the  right to do so in the  future.  In order to  ensure  prompt  receipt  of an
investor's Federal Funds wire, for an initial  investment,  it is important that
an investor follows these steps:

     A. Telephone the Fund's transfer agent, PFPC, toll-free (888) 261-4073, and
     provide PFPC with your name, address,  telephone number, Social Security or
     Tax Identification  Number, the Fund selected,  the amount being wired, and
     by which  bank.  PFPC will then  provide an  investor  with a Fund  account
     number.  Investors with existing  accounts should also notify PFPC prior to
     wiring funds.

                                       12
<PAGE>

     B. Instruct your bank or broker to wire the specified amount, together with
     your assigned account number, to PFPC's account with PNC Bank:

                  PNC Bank, N.A.
                  Philadelphia, PA 19103
                  ABA NUMBER: 0310-0005-3
                  CREDITING ACCOUNT NUMBER: 86-1108-2507
                  FROM: (name of investor)
                  ACCOUNT NUMBER: (Investor's account number with the Fund)
                  FOR PURCHASE OF: Boston Partners Bond Fund
                  AMOUNT: (amount to be invested)

     C. Fully complete and sign the application and mail it to the address shown
     thereon.  PFPC  will  not  process  purchases  until  it  receives  a fully
     completed and signed application.

     For subsequent investments, an investor should follow steps A and B above.

AUTOMATIC INVESTING

     Additional  investments in Shares may be made  automatically by authorizing
the Fund's  transfer agent to withdraw  funds from your bank account.  Investors
desiring to participate in the Automatic  Investment Plan should call the Fund's
transfer agent, PFPC, at (888) 261-4073 to obtain the appropriate forms.

RETIREMENT PLANS

     Shares may be purchased in conjunction with individual  retirement accounts
("IRAs")  and rollover  IRAs where PFPC Trust  Company  acts as  Custodian.  For
further  information as to applications  and annual fees,  contact PFPC at (888)
261-4073.  To  determine  whether the  benefits of an IRA are  available  and/or
appropriate, a shareholder should consult with a tax adviser.

HOW TO REDEEM AND EXCHANGE SHARES
- --------------------------------------------------------------------------------

REDEMPTION BY MAIL

     Shareholders may redeem for cash some or all of their Shares of the Fund at
any time.  To do so, a written  request in proper form must be sent  directly to
Boston  Partners Bond Fund c/o PFPC Inc.,  P.O. Box 8852,  Wilmington,  Delaware
19899-8852. There is no charge for a redemption.

     A request for  redemption  must be signed by all persons in whose names the
Shares  are   registered.   Signatures  must  conform  exactly  to  the  account
registration.  If the proceeds of the redemption would exceed $10,000, or if the
proceeds are not to be paid to the record owner at the record address, or if the
shareholder is a corporation, partnership, trust or fiduciary, signature(s) must
be  guaranteed  according  to the  procedures  described  below under  "Exchange
Privilege."

     Generally,  a properly signed written  request with any required  signature
guarantee  is all that is required  for a  redemption.  In some cases,  however,
other  documents may be  necessary.  In the case of  shareholders  holding share
certificates,  the certificates for the shares being redeemed must accompany the
redemption  request.  Additional  documentary  evidence  of  authority  is  also
required by the Fund's transfer agent in the event  redemption is requested by a
corporation, partnership, trust, fiduciary, executor or administrator.

SYSTEMATIC WITHDRAWAL PLAN

     If your  account  has a value  of at least  $10,000,  you may  establish  a
Systematic  Withdrawal Plan and receive regular periodic payments.  A request to
establish a Systematic  Withdrawal  Plan must be submitted in writing to PFPC at
P.O. Box

                                       13
<PAGE>

8852,  Wilmington,  Delaware  19899-8852.  Each  withdrawal  redemption  will be
processed  on or about  the 25th of the month  and  mailed  as soon as  possible
thereafter.  There are no service  charges for  maintenance;  the minimum amount
that you may withdraw  each period is $100.  (This is merely the minimum  amount
allowed and should not be mistaken  for a  recommended  amount.) The holder of a
Systematic  Withdrawal Plan will have any income dividends and any capital gains
distributions  reinvested in full and fractional  shares at net asset value.  To
provide  funds  for  payment,  Shares  will be  redeemed  in such  amount  as is
necessary  at the  redemption  price,  which is net asset value next  determined
after the  Fund's  receipt of a  redemption  request.  Redemption  of Shares may
reduce or possibly exhaust the Shares in your account, particularly in the event
of a  market  decline.  As  with  other  redemptions,  a  redemption  to  make a
withdrawal  payment is a sale for federal  income tax  purposes.  Payments  made
pursuant to a Systematic Withdrawal Plan cannot be considered as actual yield or
income since part of such payments may be a return of capital.

     You will ordinarily not be allowed to make  additional  investments of less
than the aggregate  annual  withdrawals  under the  Systematic  Withdrawal  Plan
during the time you have the plan in effect and,  while a Systematic  Withdrawal
Plan is in effect,  you may not make  periodic  investments  under the Automatic
Investment Plan. You will receive a confirmation of each transaction showing the
sources of the payment and the Share and cash  balance  remaining  in your plan.
The plan may be terminated on written  notice by the  shareholder or by the Fund
and will terminate  automatically if all Shares are liquidated or withdrawn from
the account or upon the death or incapacity of the  shareholder.  You may change
the amount and  schedule  of  withdrawal  payments or suspend  such  payments by
giving written notice to the Fund's  transfer agent at least seven Business Days
prior to the end of the month preceding a scheduled payment.

INVOLUNTARY REDEMPTION

     RBB  reserves the right to redeem a  shareholder's  account at any time the
net asset value of the account falls below $500 as the result of a redemption or
an exchange request.  Shareholders will be notified in writing that the value of
their  account is less than $500 and will be allowed 30 days to make  additional
investments before the redemption is processed.

PAYMENT OF REDEMPTION PROCEEDS

     In all cases,  the  redemption  price is the net asset value per share next
determined  after the request for  redemption  is received in proper form by the
Fund or its agents.  Payment for Shares  redeemed is made by check mailed within
seven days after  acceptance  by the Fund or its agents of the  request  and any
other necessary  documents in proper order. Such payment may be postponed or the
right of  redemption  suspended as provided by law. If the Shares to be redeemed
have been  recently  purchased  by check,  PFPC may delay  mailing a  redemption
check,  for up to 15 days,  pending a determination  that the check has cleared.
The Fund has  elected to be governed by Rule 18f-1 under the 1940 Act so that it
is obligated to redeem its shares solely in cash up to the lesser of $250,000 or
1% of its net asset value during any 90-day period for any one  shareholder of a
portfolio.

EXCHANGE PRIVILEGE

     The exchange  privilege is available to shareholders  residing in any state
in which the Shares  being  acquired  may be legally  sold.  A  shareholder  may
exchange  Shares of the Fund for Investor  Shares of any other  Boston  Partners
Fund of RBB,  subject to the  restrictions  described under "Exchange  Privilege
Limitations" below. Such exchange will be effected at the net asset value of the
exchanged  Fund  and the  net  asset  value  of the  Fund  being  acquired  next
determined after receipt of a request for an exchange by the Fund or its agents.
An exchange of Shares will be treated as a sale for federal income tax purposes.
See  "Taxes." A  shareholder  wishing to make an exchange may do so by sending a
written request to PFPC.

     If the exchanging shareholder does not currently own Investor Shares of the
Boston Partners Fund into which he would like to exchange, a new account will be
established with the same registration, dividend and capital gain options as the
account from which shares are exchanged,  unless otherwise  specified in writing
by the shareholder with all signatures guaranteed.  A signature guarantee may be
obtained from a domestic bank or trust company,  broker, dealer, clearing agency
or savings association who are participants in a medallion program recognized by
the Securities Transfer Association. The

                                       14
<PAGE>


three  recognized  medallion  programs are Securities  Transfer Agents Medallion
Program  (STAMP),  Stock Exchanges  Medallion  Program (SEMP) and New York Stock
Exchange,  Inc. Medallion Signature Program (MSP). Signature guarantees that are
not part of these programs will not be accepted.  The exchange  privilege may be
modified or  terminated at any time, or from time to time, by RBB, upon 60 days'
written notice to shareholders.

     If an exchange is to a new account in the acquired  Fund,  the dollar value
of Investor  Shares  acquired must equal or exceed that Fund's minimum for a new
account;  if to an existing account,  the dollar value must equal or exceed that
Fund's  minimum for  subsequent  investments.  If any amount remains in the Fund
from which the  exchange  is being  made,  such  amount  must not drop below the
minimum account value required by the Fund.

EXCHANGE PRIVILEGE LIMITATIONS

     The Fund's exchange privilege is not intended to afford  shareholders a way
to speculate on  short-term  movements in the market.  Accordingly,  in order to
prevent excessive use of the exchange privilege that may potentially disrupt the
management  of  the  Funds  and  increase   transactions  costs,  the  Fund  has
established a policy of limiting excessive exchange activity.

     Shareholders are entitled to six (6) exchange redemptions (at least 30 days
apart)  from the Fund  during any  twelve-month  period.  Notwithstanding  these
limitations,  the  Fund  reserves  the  right to  reject  any  purchase  request
(including  purchases by exchange)  that is deemed to be disruptive to efficient
portfolio management.

TELEPHONE TRANSACTIONS

     In order to request an exchange or redemption  by telephone,  a shareholder
must  have  completed  and  returned  an  account  application   containing  the
appropriate telephone election. To add a telephone option to an existing account
that  previously  did  not  provide  for  this  option,  a  Telephone   Exchange
Authorization Form must be filed with PFPC. These forms are available from PFPC.
Once this election has been made,  the  shareholder  may simply  contact PFPC by
telephone  to request the  exchange or  redemption  by calling  (888)  261-4073.
Neither RBB, the Fund, the  Distributor,  the  Administrator  nor any other Fund
agent will be liable for any loss,  liability,  cost or  expense  for  following
RBB's  telephone  transaction   procedures  described  below  or  for  following
instructions  communicated  by  telephone  that they  reasonably  believe  to be
genuine.

     RBB's telephone transaction  procedures include the following measures: (1)
requiring the appropriate  telephone  transaction privilege forms; (2) requiring
the  caller to provide  the names of the  account  owners,  the  account  social
security number and name of the Fund, all of which must match RBB's records; (3)
requiring RBB's service representative to complete a telephone transaction form,
listing  all of the above  caller  identification  information;  (4)  permitting
exchanges only if the two account  registrations  are  identical;  (5) requiring
that  redemption  proceeds be sent only by check to the account owners of record
at the  address of  record,  or by wire only to the owners of record at the bank
account  of  record;  (6)  sending a  written  confirmation  for each  telephone
transaction  to the owners of record at the  address of record  within  five (5)
business days of the call; and (7) maintaining  tapes of telephone  transactions
for six months, if the Fund elects to record shareholder telephone transactions.
For  accounts  held of record by  broker-dealers  (other than the  Distributor),
financial  institutions,   securities  dealers,  financial  planners  and  other
industry  professionals,  additional  documentation or information regarding the
scope of a caller's authority is required.  Finally, for telephone  transactions
in accounts held jointly, additional information regarding other account holders
is required. Telephone transactions will not be permitted in connection with IRA
or other  retirement  plan accounts or by an  attorney-in-fact  under a power of
attorney.

NET ASSET VALUE
- --------------------------------------------------------------------------------
     The net asset value for each class of the Fund is  calculated by adding the
value of the proportionate interest of each class in the Fund's securities, cash
and other assets,  deducting the actual and accrued liabilities of the class and
dividing

                                       15
<PAGE>


by the total number of outstanding  shares of the class.  The net asset value is
calculated as of the close of regular trading on the NYSE on each Business Day.

     Valuation of securities held by the Fund is as follows:  securities  traded
on a national  securities  exchange or on the NASDAQ  National Market System are
valued at the last reported sale price that day; securities traded on a national
securities exchange or on the NASDAQ National Market System for which there were
no sales on that day and securities traded on other over-the-counter markets for
which market  quotations are readily available are valued at the mean of the bid
and asked prices;  and  securities  for which market  quotations are not readily
available  are valued at fair  market  value as  determined  in good faith by or
under the  direction of RBB's Board of Directors.  The amortized  cost method of
valuation may also be used with respect to debt  obligations  with sixty days or
less remaining to maturity.

     With the  approval  of the Board of  Directors,  the Fund may use a pricing
service,  bank or broker-dealer  experienced in such matters to value the Fund's
securities. A more detailed discussion of net asset value and security valuation
is contained in the Statement of Additional Information.

DIVIDENDS AND DISTRIBUTIONS
- --------------------------------------------------------------------------------
     The Fund will distribute substantially all of the net investment income and
net realized capital gains, if any, of the Fund to the Fund's shareholders.  All
distributions  are  reinvested  in the form of  additional  full and  fractional
Shares unless a shareholder elects otherwise.

     The Fund will declare and pay dividends from net investment income monthly.
Net realized  capital gains  (including net short-term  capital gains),  if any,
will be distributed at least annually.

TAXES
- --------------------------------------------------------------------------------
     The  following  discussion is only a brief summary of some of the important
tax considerations  generally affecting the Fund and its shareholders and is not
intended as a substitute for careful tax planning. Accordingly, investors in the
Fund should consult their tax advisers with specific  reference to their own tax
situation.

     The Fund will elect to be taxed as a  regulated  investment  company  under
Subchapter M of the Internal  Revenue Code of 1986,  as amended.  So long as the
Fund qualifies for this tax treatment, it will be relieved of federal income tax
on amounts  distributed to  shareholders,  but  shareholders,  unless  otherwise
exempt, will pay income or capital gains taxes on amounts so distributed (except
distributions  that are  treated as a return of capital)  regardless  of whether
such distributions are paid in cash or reinvested in additional shares.

     Distributions  out of the "net capital  gain" (the excess of net  long-term
capital  gain over net  short-term  capital  loss),  if any, of the Fund will be
taxed to shareholders as long-term capital gain regardless of the length of time
a shareholder has held his Shares,  whether such gain was reflected in the price
paid for the Shares,  or whether  such gain was  attributable  to bonds  bearing
tax-exempt interest.  All other  distributions,  to the extent they are taxable,
are taxed to shareholders as ordinary income.

     RBB will send written  notices to shareholders  annually  regarding the tax
status of distributions made by the Fund.  Dividends declared in December of any
year payable to  shareholders of record on a specified date in such a month will
be deemed to have been  received by the  shareholders  on December 31,  provided
such dividends are paid during  January of the following  year. The Fund intends
to make  sufficient  actual  or  deemed  distributions  prior to the end of each
calendar year to avoid liability for federal excise tax.

     Investors  should be careful to  consider  the tax  implications  of buying
shares just prior to a distribution.  The price of shares purchased at that time
will  reflect  the  amount  of the  forthcoming  distribution.  Those  investors
purchasing shares

                                       16
<PAGE>

immediately  prior to a distribution  will  nevertheless  be taxed on the entire
amount of the distribution received,  although the distribution is, in effect, a
return of capital.

     Shareholders  who exchange  shares  representing  interests in one Fund for
shares  representing  interests in another Fund will generally recognize capital
gain or loss for federal income tax purposes.

     Shareholders  who are  nonresident  alien  individuals,  foreign  trusts or
estates,  foreign  corporations  or  foreign  partnerships  may  be  subject  to
different U.S. federal income tax treatment.

MULTI-CLASS STRUCTURE
- --------------------------------------------------------------------------------
     The Fund offers one other class of shares,  Institutional  Shares, which is
offered directly to institutional  investors pursuant to a separate  prospectus.
Shares of each class  represent  equal pro rata interests in the Fund and accrue
dividends and calculate net asset value and  performance  quotations in the same
manner. The Fund will quote performance of Institutional  Shares separately from
Investor  Shares.  Because of different  fees paid by the Investor  Shares,  the
total return on such shares can be expected,  at any time, to be different  than
the total return on Institutional Shares. Information concerning the other class
may be obtained by calling the Fund at (888) 261-4073.

DESCRIPTION OF SHARES
- --------------------------------------------------------------------------------
     RBB has authorized  capital of thirty billion shares of Common Stock, $.001
par value per share,  of which 18.326  billion  shares are currently  classified
into 97 different  classes of Common Stock.  See  "Description of Shares" in the
Statement of Additional Information.

     THIS  PROSPECTUS AND THE STATEMENT OF ADDITIONAL  INFORMATION  INCORPORATED
HEREIN RELATE  PRIMARILY TO THE BOSTON  PARTNERS BOND FUND AND DESCRIBE ONLY THE
INVESTMENT  OBJECTIVES  AND  POLICIES,  OPERATIONS,  CONTRACTS AND OTHER MATTERS
RELATING TO THE BOSTON PARTNERS BOND FUND.

     Each  share  that   represents  an  interest  in  the  Fund  has  an  equal
proportionate interest in the assets belonging to the Fund with each other share
that  represents  an  interest  in the Fund,  even where a share has a different
class  designation  than  another  share  representing  an interest in the Fund.
Shares of the Fund do not have preemptive or conversion rights.  When issued for
payment  as  described  in this  Prospectus,  Shares  will  be  fully  paid  and
non-assessable.

     RBB  currently  does not intend to hold  annual  meetings  of  shareholders
except  as  required  by the 1940 Act or other  applicable  law.  The law  under
certain circumstances provides shareholders with the right to call for a meeting
of shareholders to consider the removal of one or more directors.  To the extent
required by law, RBB will assist in shareholder communication in such matters.

     Holders of Shares of the Fund will vote in the  aggregate  and not by class
on all matters, except where otherwise required by law. Further, shareholders of
all investment portfolios of RBB will vote in the aggregate and not by portfolio
except as otherwise  required by law or when the Board of  Directors  determines
that the matter to be voted upon affects only the interests of the  shareholders
of  a  particular  investment  portfolio.   (See  the  Statement  of  Additional
Information under "Additional  Information  Concerning Fund Shares" for examples
of when the 1940 Act  requires  voting by  investment  portfolio  or by  class.)
Shareholders  of the Fund are  entitled  to one vote for each  full  share  held
(irrespective of class or portfolio) and fractional votes for fractional  shares
held.  Voting rights are not cumulative  and,  accordingly,  the holders of more
than 50% of the  aggregate  shares of Common  Stock of the Fund may elect all of
the directors.

     As of November 16, 1998, to the Fund's knowledge,  no person held of record
or beneficially 25% or more of the outstanding shares of all classes of RBB.

                                       17
<PAGE>

OTHER INFORMATION
- --------------------------------------------------------------------------------

REPORTS AND INQUIRIES

     Shareholders  will receive  unaudited  semi-annual  reports  describing the
Fund's  investment   operations  and  annual  financial  statements  audited  by
independent accountants. Shareholder inquiries should be addressed to the Fund's
transfer  agent,  PFPC Inc., at Bellevue  Park  Corporate  Center,  400 Bellevue
Parkway, Wilmington, Delaware 19809, toll-free (888) 261-4073.

SHARE CERTIFICATES

     In  the  interest  of  economy  and  convenience,   physical   certificates
representing shares in the Fund are not normally issued.

HISTORICAL PERFORMANCE INFORMATION
     For the period from commencement of operations  (December 30, 1998) through
August 31, 1998,  the total  return since  inception  (not  annualized)  for the
Investor Class of Shares of the Fund was as follows:

     Unannualized investment returns for the period ended August 31, 1998

                                                                      Since
                                                                    Inception
                                                                    ---------
     Boston Partners Bond Fund
       (Investor Shares) ......................................       4.63%

     The total return  assumes  reinvestment  of all dividends and capital gains
and  reflects  expense  reimbursements  and  investment  advisory fee waivers in
effect.  Without these expense  reimbursements  waivers,  the Fund's performance
would have been lower.  Of course,  past  performance  is no guarantee of future
results.  Investment return and principal value will fluctuate,  so that Shares,
when  redeemed,  may be worth  more or less  than the  original  cost.  For more
information on performance,  see  "Performance  Information" in the Statement of
Additional Information.

     The table below  presents the Composite  performance  history of certain of
the Adviser's  managed  accounts on an annualized  basis since inception and for
the year ended  September  30,  1998.  The  Composite is comprised of all of the
Adviser's  institutional  accounts and other  privately  managed  accounts  with
investment objectives, policies and strategies substantially similar to those of
the Fund, although the accounts have operating  histories,  whereas the Fund had
not commenced  operations  until  December 30, 1997.  The Composite  performance
information  includes the  reinvestment  of interest  received by the underlying
securities,  realized and unrealized gains and losses,  and reflects the payment
of investment advisory fees and transaction expenses.  The Composite performance
does not  include  custody  fees or  administrative  fees that may be charged by
banks,   fiduciaries,   or  other  third  parties  in   connection   with  these
institutional and privately managed accounts.  The privately managed accounts in
the  Composite  are  only  available  to the  Adviser's  institutional  advisory
clients.  The past  performance  of the accounts which comprise the Composite is
not indicative of the future  performance of the Fund. These accounts have lower
investment  advisory  fees than the Fund and the Composite  performance  figures
would have been lower if subject to the higher fees and  expenses to be incurred
by the Fund.  These private accounts are also not subject to the same investment
limitations,  diversification  requirements  and  other  restrictions  which are
imposed  upon mutual  funds under the 1940 Act and the  Internal  Revenue  Code,
which, if imposed,  may have adversely  affected the performance  results of the
Composite.  Listed  below  the  performance  history  for  the  Composite  is  a
comparative  index  comprised of securities  similar to those in which  accounts
contained in the Composite are invested.

                                       18
<PAGE>

     Average  annualized  investment  returns for the period ended September 30,
1998

                                                           ONE          SINCE
                                                           YEAR        INCEPTION
                                                          ------       ---------
         Composite Performance. ........................   8.70%         9.20%
         Lehman Brothers Aggregate Bond Index ..........  11.50%         8.60%

     The Lehman Brothers Aggregate Bond Index is a broad market-weighted  index,
which  encompasses  three  major  classes  of   investment-grade,   fixed-income
securities  with  maturities  greater  than one year,  including  U.S.  Treasury
securities, corporate bonds and mortgage-backed securities.

* The Adviser commenced managing these accounts on June 1, 1995

FUTURE PERFORMANCE INFORMATION

     From  time to time,  the  Fund may  advertise  its  performance,  including
comparisons  to other  mutual funds with similar  investment  objectives  and to
stock or other relevant indices.  All such  advertisements will show the average
annual total return over one, five and ten year periods or, if such periods have
not yet elapsed,  shorter  periods  corresponding  to the life of the Fund. Such
total  return  quotations  will be computed by finding  the  compounded  average
annual total  return for each time period that would equate the assumed  initial
investment of $1,000 to the ending redeemable value, net of fees, according to a
required standardized  calculation.  The standard calculation is required by the
SEC to provide consistency and comparability in investment company  advertising.
The Fund may also from time to time  include in such  advertising  an  aggregate
total return figure or a total return figure that is not calculated according to
the  standardized  formula  in order  to  compare  more  accurately  the  Fund's
performance with other measures of investment  return.  For example,  the Fund's
total return may be compared with data published by Lipper Analytical  Services,
Inc., CDA  Investment  Technologies,  Inc. or  Weisenberger  Investment  Company
Service,  or with the performance of the Lehman  Brothers  Aggregate Bond Index.
Performance  information  may also include  evaluation of the Fund by nationally
recognized   ranking   services  and   information   as  reported  in  financial
publications  such as Business  Week,  Fortune,  Institutional  Investor,  Money
Magazine,  Forbes,  Barron's,  The Wall Street  Journal,  The New York Times, or
other national,  regional or local publications.  All advertisements  containing
performance  data will include a legend  disclosing that such  performance  data
represents past  performance and that the investment  return and principal value
of an investment will fluctuate so that an investor's Shares, when redeemed, may
be worth more or less than their original cost.

                                       19
<PAGE>


NO  PERSON  HAS  BEEN   AUTHORIZED   TO  GIVE  ANY   INFORMATION   OR  MAKE  ANY
REPRESENTATIONS  NOT  CONTAINED  IN THIS  PROSPECTUS  OR IN RBB'S  STATEMENT  OF
ADDITIONAL INFORMATION  INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE
OFFERING MADE BY THIS  PROSPECTUS  AND, IF GIVEN OR MADE,  SUCH  REPRESENTATIONS
MUST NOT BE RELIED UPON AS HAVING  BEEN  AUTHORIZED  BY RBB OR ITS  DISTRIBUTOR.
THIS  PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY RBB OR BY THE DISTRIBUTOR IN
ANY JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY BE MADE.


                               -------------------
                                TABLE OF CONTENTS
                                                                            PAGE
                                                                            ----
EXPENSE TABLE ...........................................................     2
FINANCIAL HIGHLIGHTS ....................................................     2
INTRODUCTION ............................................................     3
INVESTMENT OBJECTIVES AND POLICIES ......................................     4
INVESTMENT LIMITATIONS ..................................................     5
RISK FACTORS ............................................................     6
YEAR 2000 ...............................................................     8
MANAGEMENT ..............................................................     9
DISTRIBUTION OF SHARES ..................................................    11
HOW TO PURCHASE SHARES ..................................................    12
HOW TO REDEEM AND EXCHANGE SHARES .......................................    13
NET ASSET VALUE .........................................................    15
DIVIDENDS AND DISTRIBUTIONS .............................................    16
TAXES ...................................................................    16
MULTI-CLASS STRUCTURE ...................................................    17
DESCRIPTION OF SHARES ...................................................    17
OTHER INFORMATION .......................................................    18
                                                                   
INVESTMENT ADVISER
Boston Partners Asset Management, L.P.
Boston, Massachusetts

CUSTODIAN
PFPC Trust Company
Wilmington, Delaware

TRANSFER AGENT
PFPC Inc.
Wilmington, Delaware

DISTRIBUTOR
Provident Distributors, Inc.
West Conshohocken, Pennsylvania

COUNSEL
Drinker Biddle & Reath LLP
Philadelphia, Pennsylvania

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers LLP
Philadelphia, Pennsylvania

[LOGO GRAPHIC OMITTED]

<PAGE>
        PROSPECTUS
     DECEMBER 29, 1998

                                 BOSTON PARTNERS
                                    MICRO CAP
                                   VALUE FUND

                             (INSTITUTIONAL SHARES)


bp
BOSTON PARTNERS ASSET MANAGEMENT, L.P.
[LOGO OMITTED]

<PAGE>

                      BOSTON PARTNERS MICRO CAP VALUE FUND
                              (INSTITUTIONAL CLASS)
                                       OF
                               THE RBB FUND, INC.

     Boston  Partners  Micro  Cap  Value  Fund  (the  "Fund")  is an  investment
portfolio  of The RBB Fund,  Inc.  ("RBB"),  an open-end  management  investment
company.  The  shares of the  Institutional  Class  ("Shares")  offered  by this
Prospectus  represent interests in the Fund. The Fund is a diversified fund that
seeks long-term growth of capital, with current income as a secondary objective,
primarily through equity investments, such as common stocks. It seeks to achieve
its  objectives  by investing at least 65% of its total assets in a  diversified
portfolio consisting of equity securities of issuers with market capitalizations
that do not exceed $500 million when  purchased by the Fund,  and  identified by
Boston Partners Asset Management, L.P. (the "Adviser") as equity securities that
it believes possess value characteristics.  The Adviser examines various factors
in determining the value  characteristics  of such issuers,  including,  but not
limited to, price to book value ratios and price to earnings ratios. These value
characteristics  are  examined  in the  context of the  issuer's  operating  and
financial fundamentals such as return on equity, earnings growth and cash flow.

     This Prospectus contains  information that a prospective  investor needs to
know before  investing.  Please  keep it for future  reference.  A Statement  of
Additional  Information,  dated  December  29,  1998,  has been  filed  with the
Securities  and Exchange  Commission  and is  incorporated  by reference in this
Prospectus.  It may be obtained  free of charge  from the Fund by calling  (888)
261-4073.  The  Prospectus  and the  Statement  of  Additional  Information  are
available for reference, along with other related materials, on the SEC Internet
Web Site (http://www.sec.gov).

SHARES OF THE FUND ARE NOT DEPOSITS OR  OBLIGATIONS OF OR GUARANTEED OR ENDORSED
BY PNC BANK,  NATIONAL  ASSOCIATION,  PFPC  TRUST COMPANY OR ANY OTHER  BANK AND
SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT  INSURANCE  CORPORATION,
THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY. INVESTMENTS IN SHARES OF THE FUND
INVOLVE INVESTMENT RISKS, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.



- --------------------------------------------------------------------------------
THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THIS
PROSPECTUS.   ANY   REPRESENTATION  TO  THE  CONTRARY  IS  A  CRIMINAL  OFFENSE.
- --------------------------------------------------------------------------------


PROSPECTUS                                                     December 29, 1998

<PAGE>

EXPENSE TABLE
- --------------------------------------------------------------------------------

     The following  table  illustrates  the  shareholder  transaction and annual
operating  expenses  incurred  by  Institutional  Shares of the Fund  (after fee
waivers and expense reimbursements) for the fiscal period ended August 31, 1998,
as a percentage of average daily net assets.  An example based on the summary is
also shown.

SHAREHOLDER TRANSACTION EXPENSES

     Maximum Sales Charge Imposed on Purchases ........................... None
                                                                         
     Maximum Sales Charge Imposed on Reinvested Dividends ................ None
                                                                         
     Maximum Deferred Sales Charge ....................................... None
                                                                         
     Redemption Fee(1) ...................................................1.00%
                                                                         
     Exchange Fee ........................................................ None
                                                                         
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)   
                                                                         
     Management Fees (after waivers)(2) ..................................0.00%
                                                                         
     12b-1 Fees ..........................................................0.00%
                                                                         
     Other Expenses (after expense reimbursements)(2) ....................1.55%
                                                                          -----
                                                                         
   Total Fund Operating Expenses (after waivers and expense              
            reimbursements)(2) ...........................................1.55%
                                                                          =====
                                                                        
(1) To prevent the Fund from being adversely  affected by the transaction  costs
    associated with short-term  shareholder  transactions,  the Fund will redeem
    shares  at a price  equal  to the net  asset  value of the  shares,  less an
    additional transaction fee equal to 1.00% of the net asset value of all such
    shares  redeemed  that have been held for less than one year.  Such fees are
    not sales charges or contingent deferred sales charges,  but are retained by
    the Fund for the benefit of all shareholders.

(2) In the absence of fee waivers and expense  reimbursements,  Management  Fees
    would be 1.25%,  Other  Expenses  would be 16.44%,  and Total Fund Operating
    Expenses  would be 17.69%.  Management  Fees are based on average  daily net
    assets and are calculated daily and paid monthly.

EXAMPLE

     An investor would pay the following  expenses on a $1,000 investment in the
Fund, assuming (1) a 5% annual return and (2) redemption at the end of each time
period (including the 1.00% transaction fee on redemptions made within a year of
purchase):
                                              1 YEAR  3 YEARS  5 YEARS  10 YEARS
                                              ------  -------  -------  --------
     Boston Partners Micro Cap Value Fund .... $16      $49      $84      $185

     The Fee Table is  designed  to  assist an  investor  in  understanding  the
various  costs and expenses  that an investor in the Fund will bear  directly or
indirectly.  (For more complete  descriptions of the various costs and expenses,
see  "Management"  below.) The Fee Table  reflects  expense  reimbursements  and
voluntary  waivers of Management Fees for the Fund,  which are expected to be in
effect  during the current  fiscal year.  However,  the Adviser,  and the Fund's
other service  providers  are under no  obligation  with respect to such expense
reimbursements and waivers and there can be no assurance that any future expense
reimbursements  and  waivers of  Management  Fees will not vary from the figures
reflected in the Fee Table.

                                       2
<PAGE>

     The Example in the Fee Table assumes that all  dividends and  distributions
are  reinvested  and  that the  amounts  listed  under  "Annual  Fund  Operating
Expenses"  remain  the  same in the  years  shown.  THE  EXAMPLE  SHOULD  NOT BE
CONSIDERED A  REPRESENTATION  OF PAST OR FUTURE EXPENSES AND ACTUAL EXPENSES MAY
BE GREATER OR LESS THAN THOSE SHOWN.

FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------

     The "Financial  Highlights"  presented  below set forth certain  investment
results for shares of the Institutional Class of the Fund for the period July 1,
1998 (date of inception) through August 31, 1998. The financial data included in
this table should be read in conjunction with the financial statements and notes
thereto   and   the   unqualified   report   of    PricewaterhouseCoopers    LLP
("PricewaterhouseCoopers"), RBB's independent accountant, which are incorporated
by reference into the Statement of Additional  Information.  Further information
about the performance of the Institutional Class of the Fund is available in the
Annual Report to Shareholders.  Both the Statement of Additional Information and
the Annual Report to  Shareholders  may be obtained from the Fund free of charge
by calling the telephone number on page 1 of the prospectus.

                                       3
<PAGE>

                      BOSTON PARTNERS MICRO CAP VALUE FUND

         (FOR AN INSTITUTIONAL SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

<TABLE>
<CAPTION>
                                                                                                  FOR THE PERIOD
                                                                                                   JULY 1, 1998*
                                                                                                THROUGH AUGUST 31,
                                                                                                       1998
                                                                                                ------------------
<S>                                                                                                   <C>   
Per Share Operating Performance**
Net asset value, beginning of period ..........................................................       $10.00
                                                                                                      ------
Net investment income/(loss) (1) ..............................................................        (0.01)
Net realized and unrealized gain on investments(2) ............................................        (2.37)
                                                                                                      ------
Net increase/(decrease) in net assets resulting from operations ...............................        (2.38)
DIVIDENDS TO SHAREHOLDERS FROM:
Net investment income .........................................................................           --
Net realized capital gains ....................................................................           --
                                                                                                      ------
Net asset value, end of period ................................................................       $ 7.62
Total investment return(3)(5) .................................................................       (23.80)%
                                                                                                      ======
Ratios/Supplemental Data
Net assets, end of period (000) ...............................................................       $1,120
Ratio of expenses to average net assets***(1)(4) ..............................................         1.55%
Ratio of net investment income/(loss) to average net assets***(1) .............................       (0.34)%
Portfolio turnover rate**** ...................................................................        11.97%
<FN>
    *  Commencement of operations.
   **  Calculated  based on shares  outstanding on the first and last day of the
       period,  except for dividends and distributions,  if any, which are based
       on actual shares outstanding on the dates of distributions.
  ***  Annualized.
 ****  Not annualized.
   (1) Reflects waivers and reimbursements.
   (2) The amount shown for a share outstanding  throughout the period is not in
       accord with the change in the aggregate  gains and losses in  investments
       during the period because of the timing of sales and  repurchases of Fund
       shares in relation to fluctuating net asset value during the period.
   (3) Total return is calculated assuming a purchase of shares on the first day
       and a sale of  shares  on the last day of the  period  reported  and will
       include  reinvestments  of dividends  and  distributions,  if any.  Total
       return is not annualized.
   (4) Without the waiver of advisory,  administrative services,  administration
       and  transfer  agent  fees  and  without  the  reimbursement  of  certain
       operating  expenses,   the  ratio  of  expenses  to  average  net  assets
       annualized  for the period  ended  August 31, 1998 would have been 17.69%
       for the Institutional Class.
   (5) Redemption fee of 1.00% is not reflected in total return calculation.

</FN>
</TABLE>

                                       4
<PAGE>

INTRODUCTION
- --------------------------------------------------------------------------------

     RBB is an open-end  management  investment  company  incorporated under the
laws of the State of  Maryland  currently  operating  or  proposing  to  operate
seventeen separate investment portfolios.  The Shares offered by this Prospectus
represent  interests  in the  Boston  Partners  Micro  Cap Value  Fund.  RBB was
incorporated in Maryland on February 29, 1988.

INVESTMENT OBJECTIVES AND POLICIES
- --------------------------------------------------------------------------------

     The Fund's investment  objective is to provide long-term growth of capital,
with  current  income  as  a  secondary  objective,   primarily  through  equity
investments,  such as common stocks.  The Fund seeks to achieve its objective by
investing, under normal market conditions, at least 65% of its total assets in a
diversified  portfolio consisting primarily of equity securities of issuers with
market  capitalizations  that do not exceed $500 million  when  purchased by the
Fund,  and  identified  by the  Adviser as equity  securities  that it  believes
possess value characteristics.

     The Fund generally invests in the equity securities of small companies. The
Adviser  will seek to invest in companies it considers to be well managed and to
have attractive  fundamental  financial  characteristics.  The Adviser  believes
greater potential for price appreciation exists among small companies since they
tend to be less widely  followed by other  securities  analysts  and thus may be
more likely to be  undervalued  by the market.  The Fund may invest from time to
time a portion of its assets, not to exceed 35% (under normal conditions) at the
time of purchase, in companies with considerably larger market capitalizations.

     The Fund presents greater risks than funds that invest in equity securities
of larger  companies  for the  following  reasons:  Companies  in which the Fund
primarily  invests will include those that have limited product lines,  markets,
or financial  resources,  or are dependent  upon a small  management  group.  In
addition,  because these stocks are not well known to the investing  public,  do
not have significant institutional ownership, and are followed by relatively few
securities analysts,  there will normally be less publicly available information
concerning these securities  compared to what is available for the securities of
larger  companies.  Adverse publicity and investor  perceptions,  whether or not
based  on  fundamental  analysis,  can  decrease  the  value  and  liquidity  of
securities held by the Fund. Historically, small capitalization stocks have been
more volatile in price than larger capitalization  stocks. Among the reasons for
the greater price  volatility of these small company stocks are the less certain
growth  prospects of smaller firms, the lower degree of liquidity in the markets
for such stocks, the greater sensitivity of small companies to changing economic
conditions, the fewer market makers and the wider spreads between quoted bid and
asked prices which exist in the over-the-counter market for such stocks. Besides
exhibiting greater volatility,  small company stocks may, to a degree, fluctuate
independently  of larger  company  stocks.  Small company  stocks may decline in
price as large company  stocks rise,  or rise in price as large  company  stocks
decline.  Investors  should therefore expect that the Fund will be more volatile
than, and may fluctuate independently of, broad stock market indices such as the
Standard & Poor's 500 Composite Stock Price Index.

     The  securities  in which the Fund invests will often be traded only in the
over-the-counter market or on a regional securities exchange, may be listed only
in the quotation  service  commonly  known as the "pink  sheets," and may not be
traded  every day or in the volume  typical of trading on a national  securities
exchange.  They may be subject to wide fluctuations in market value. The trading
market for any given security may be  sufficiently  thin as to make it difficult
for the  Fund  to  dispose  of a  substantial  block  of  such  securities.  The
disposition by the Fund of portfolio securities to meet redemptions or otherwise
may require the Fund to sell these  securities  at a discount from market prices
or during  periods when,  in the Adviser's  judgment,  such  disposition  is not
desirable or to make many small sales over a lengthy period of time.

                                       5
<PAGE>

     The   Adviser   examines   various   factors  in   determining   the  value
characteristics  of such issuers,  including,  but not limited to, price to book
value  ratios and price to  earnings  ratios.  These value  characteristics  are
examined in the context of the issuer's  operating  and  financial  fundamentals
such as return on equity, earnings growth and cash flow.

     The Adviser selects securities for the Fund based on a fundamental analysis
of  industries  and  companies,  earning  power and growth and other  investment
criteria.  In general,  the Fund's  investments are broadly  diversified  over a
number of industries and, as a matter of policy, the Fund will not invest 25% or
more of its total assets in any one industry.

     The Fund may invest up to 25% of its total assets in  securities of foreign
issuers, including American Depository Receipts ("ADRs") and European Depository
Receipts   ("EDRs").   Investing  in  securities  of  foreign  issuers  involves
considerations  not  typically   associated  with  investing  in  securities  of
companies  organized  and  operating in the United  States.  Foreign  securities
generally are denominated  and pay dividends or interest in foreign  currencies.
The Fund may hold from time to time various  foreign  currencies  pending  their
investment in foreign  securities or their  conversion  into U.S.  dollars.  The
value of the assets of the Fund as measured in U.S.  dollars  may  therefore  be
affected  favorably or  unfavorably by changes in exchange  rates.  There may be
less publicly available information concerning foreign issuers than is available
with respect to U.S. issuers.  Foreign securities may not be registered with the
U.S. Securities and Exchange  Commission,  and generally,  foreign companies are
not subject to uniform accounting, auditing and financial reporting requirements
comparable  to those  applicable  to U.S.  issuers.  ADRs and EDRs are  receipts
issued  by a U.S.  bank or trust  company  evidencing  ownership  of  underlying
securities issued by a foreign issuer. ADRs and EDRs may be listed on a national
securities  exchange or may trade in the  over-the-counter  market.  ADR and EDR
prices are denominated in U.S. dollars,  even though the underlying security may
be denominated in a foreign currency.  The underlying security may be subject to
foreign  government  taxes  which  would  reduce  the yield on such  securities.
Investments  in such  instruments  involve  risks  similar to those of investing
directly in foreign securities. See "Investment Objectives and Policies--Foreign
Securities" in the Statement of Additional Information.

     The Fund may  invest  the  remainder  of its  total  assets  in  derivative
securities;  debt  securities  issued  by U.S.  banks,  corporations  and  other
business organizations that are investment grade securities; and debt securities
issued by the U.S. Government or government agencies.

     In accordance with the above-mentioned  policies,  the Fund may also invest
in indexed securities,  repurchase  agreements,  reverse repurchase  agreements,
dollar rolls, financial futures contracts,  options on futures contracts and may
lend  portfolio  securities.  See  "Investment  Objectives  and Policies" in the
Statement of Additional Information.

     The Fund may invest in registered investment companies and investment funds
in foreign countries subject to the provisions of the Investment  Company Act of
1940, as amended (the "1940 Act"),  and as discussed in  "Investment  Objectives
and Policies" in the Statement of Additional Information. If the Fund invests in
such investment  companies,  the Fund will bear its  proportionate  share of the
costs incurred by such companies, including investment advisory fees.

     While the Adviser intends to fully invest the Fund's assets at all times in
accordance  with the  above-mentioned  policies,  the Fund reserves the right to
hold up to 100% of its assets,  as a temporary  defensive  measure,  in cash and
eligible U.S.  dollar-denominated  money market  instruments.  The Adviser would
determine when market conditions warrant temporary defensive measures.

     The Fund's  investment  objective and the policies  described  above may be
changed by RBB's Board of Directors  without the affirmative vote of the holders
of a majority of the outstanding Shares representing interests in the Fund.

                                       6
<PAGE>

INVESTMENT LIMITATIONS
- --------------------------------------------------------------------------------

     The  Fund may not  change  the  following  investment  limitations  without
shareholder approval. (A complete list of the investment limitations that cannot
be changed without such a vote of the shareholders is contained in the Statement
of Additional Information under "Investment Objectives and Policies.")

     The Fund may not:

         1.  Purchase the  securities of any one issuer,  other than  securities
     issued  or   guaranteed   by  the  U.S.   Government  or  its  agencies  or
     instrumentalities,  if  immediately  after and as a result of such purchase
     more than 5% of the value of the Fund's  total  assets would be invested in
     the securities of such issuer,  or more than 10% of the outstanding  voting
     securities of such issuer would be owned by the Fund, except that up to 25%
     of the value of the Fund's total assets may be invested  without  regard to
     such limitations.

         2. Purchase any securities  which would cause, at the time of purchase,
     25% or more of the value of the total  assets of the Fund to be invested in
     the obligations of issuers in any single  industry,  provided that there is
     no limitation with respect to investments in U.S. Government obligations.

         3. Borrow  money or issue senior  securities,  except that the Fund may
     borrow from banks and enter into reverse  repurchase  agreements and dollar
     rolls for temporary purposes in amounts up to one-third of the value of its
     total  assets  at the  time of  such  borrowing;  or  mortgage,  pledge  or
     hypothecate  any assets,  except in connection  with any such borrowing and
     then in amounts not in excess of one-third of the value of the Fund's total
     assets at the time of such borrowing. The Fund will not purchase securities
     while its aggregate  borrowings  (including reverse repurchase  agreements,
     dollar  rolls and  borrowings  from banks) are in excess of 5% of its total
     assets.  Securities held in escrow or separate  accounts in connection with
     the Fund's  investment  practices  are not  considered  to be borrowings or
     deemed to be pledged for purposes of this limitation.

     If a percentage  restriction under one of the Fund's investment policies or
restrictions  or the use of assets is  adhered to at the time a  transaction  is
effected, later changes in percentage resulting from changing values will not be
considered a violation  (except with respect to any restrictions  that may apply
to borrowings or senior securities issued by the Fund).

     The Fund  presently has no intention to  participate  as a purchaser in any
initial  public  offering  of  securities  that may  trade at a  premium  in the
secondary market when such a secondary  market exists,  although it reserves the
ability to participate in such offerings in the future.

PORTFOLIO TURNOVER

     The Fund retains the right to sell securities irrespective of how long they
have been held. The Adviser  estimates that the annual turnover in the Fund will
not exceed 150% during the current fiscal year. Such a relatively high portfolio
turnover will be accompanied by relatively high transactional (i.e.,  brokerage)
costs.  It may also result in increased  capital gains  realized by the Fund and
distributed to shareholders.

RISK FACTORS
- --------------------------------------------------------------------------------

     As with other mutual  funds,  there can be no assurance  that the Fund will
achieve its objective.  The net asset value per share of Shares  representing an
interest in the Fund will  fluctuate as the values of its  portfolio  securities
change in response to changing conditions in the equity market. An investment in
the Fund is not intended to constitute a balanced  investment program. As of the
date of this  Prospectus,  U.S. stock markets were trading at or close to record
high levels and there can be no guarantee that such levels will continue.  Other
risk factors are discussed above under "Investment  Objectives and Policies" and
in the Statement of Additional  Information  under  "Investment  Objectives  and
Policies."

                                       7
<PAGE>

     European Currency Unification. Many European countries are about to adopt a
single  European  currency,  the euro. On January 1, 1999,  the euro will become
legal tender for all countries  participating in the Economic and Monetary Union
("EMU").  A new  European  Central  Bank will be created to manage the  monetary
policy of the new unified  region.  On the same date, the exchange rates will be
irrevocably  fixed between the EMU member  countries.  National  currencies will
continue to  circulate  until they are  replaced by euro coins and bank notes by
the middle of 2002.

     This change is likely to significantly  impact the European capital markets
in which the Fund may invest and may result in the Fund facing  additional risks
in pursuing its investment  objective.  These risks, which include,  but are not
limited  to,  uncertainty  as to  the  proper  tax  treatment  of  the  currency
conversion, volatility of currency exchange rates as a result of the conversion,
uncertainty  as to capital  market  reaction,  conversion  costs that may affect
issuer  profitability  and  creditworthiness,  and lack of participation by some
European  countries,  may increase the  volatility of the Fund's net asset value
per share.

YEAR 2000
- --------------------------------------------------------------------------------

     Like  other  mutual  funds,   financial  and  business   organizations  and
individuals  around  the  world,  the Fund could be  adversely  affected  if the
computer systems used by the Adviser and the Fund's other service providers,  or
persons with whom they deal, do not properly process and calculate  date-related
information  and data  from and after  January  1,  2000.  This  possibility  is
commonly known as the "Year 2000 Problem." The Year 2000 Problem could also hurt
companies whose securities the Fund holds or securities markets  generally.  The
Fund has been advised by the Adviser,  the Administrators and the Custodian that
they are actively  taking steps to address the Year 2000 Problem with respect to
the computer  systems  that they use and to obtain  assurances  that  comparable
steps are being taken by the Fund's other major service  providers.  While there
can be no  assurance  that  the  Fund's  service  providers  will be  Year  2000
compliant,  the Fund's service providers expect that their plans to be compliant
will be achieved.

GENERAL

     Investment  methods  described in this Prospectus are among those which the
Fund has the power to utilize.  Some may be employed on a regular basis;  others
may not be used at all.  Accordingly,  reference  to any  particular  method  or
technique  carries no implication that it will be utilized or, if it is, that it
will be successful.

MANAGEMENT
- --------------------------------------------------------------------------------

BOARD OF DIRECTORS

     The  business  and  affairs  of RBB and the  Fund  are  managed  under  the
direction of RBB's Board of Directors.

INVESTMENT ADVISER

     Boston Partners Asset Management,  L.P.,  located at 28 State Street,  21st
Floor, Boston, Massachusetts 02109, serves as the Fund's investment adviser. The
Adviser  provides  investment  management  and investment  advisory  services to
investment  companies and other institutional  accounts that had aggregate total
assets under management as of October 31, 1998, in excess of $16.0 billion.  The
adviser  is  organized  as a Delaware  limited  partnership  whose sole  general
partner is Boston Partners, Inc., a Delaware corporation.

     Subject to the supervision  and direction of RBB's Board of Directors,  the
Adviser manages the Fund's  portfolio in accordance  with the Fund's  investment
objective and policies,  makes investment  decisions for the Fund, places orders
to purchase and sell securities, and employs professional portfolio managers and
securities  analysts who provide research services to the Fund. For its services
to the Fund, the Adviser is paid a monthly advisory fee computed at an

                                       8
<PAGE>


annual rate of 1.25% of the Fund's  average  daily net  assets.  The Adviser has
notified RBB,  however,  that it intends to limit total Fund operating  expenses
during the current fiscal year.

PORTFOLIO MANAGEMENT

     The day-to-day  portfolio  management of the Fund is the  responsibility of
David M. Dabora and Wayne J. Archambo who are portfolio managers of the Adviser.
Prior to taking on day to day responsibilities for the Micro Cap Value Fund, Mr.
Dabora was an assistant portfolio  manager/analyst of the premium equity product
of the Adviser,  an all-cap  value  institutional  product.  Before  joining the
Adviser in April 1995,  Mr. Dabora had been employed by The Boston Company Asset
Management,  Inc. since 1991 as a senior equity analyst.  Mr. Dabora has over 11
years  of  investment  experience  and is a  Chartered  Financial  Analyst.  Mr.
Archambo  oversees  the  investment  activities  of the  Adviser's  $1.5 billion
mid-capitalization  value  equity  product as well as the $120  million  Mid Cap
Value Fund and small-cap assets worth $1.0 billion. Prior to joining the Adviser
in April  1995,  Mr.  Archambo  had been  employed by The Boston  Company  Asset
Management,  Inc. since 1989 as a senior portfolio  manager and a member of that
firm's Equity  Policy  Committee.  Mr.  Archambo has over 16 years of investment
experience and is a Chartered Financial Analyst.

ADMINISTRATOR

     PFPC  Inc.  ("PFPC")  serves  as  administrator  to the Fund and  generally
assists the Fund in all aspects of its administration and operations,  including
matters relating to the maintenance of financial records and accounting. For its
services,  PFPC  receives  a fee  calculated  at an annual  rate of .125% of the
Fund's average daily net assets,  with a minimum  annual fee of $75,000  payable
monthly on a pro rata basis.

ADMINISTRATIVE SERVICES AGENT

     Provident  Distributors,   Inc.  ("PDI")  provides  certain  administrative
services  to the Fund's  Institutional  Shares not  otherwise  provided by PFPC.
PDI's  principal   business  address  is  Four  Falls  Corporate  Center,   West
Conshohocken,  Pennsylvania  19428. PDI furnishes certain internal  quasi-legal,
executive and administrative services to the Fund, acts as a liaison between the
Fund and its  various  service  providers  and  coordinates  and  assists in the
preparation of reports prepared on behalf of the Fund. For its services,  PDI is
entitled  to a  monthly  fee  calculated  at the  annual  rate  of  .15%  of the
respective  average daily net assets of the Fund's  Institutional  Class. PDI is
currently  waiving fees in excess of .03% of the average daily net assets of the
Fund's Institutional Class.

DISTRIBUTOR

     PDI acts as distributor for the Shares pursuant to a distribution agreement
(the "Distribution Agreement") with RBB on behalf of the Shares.

TRANSFER AGENT, DIVIDEND DISBURSING AGENT, AND CUSTODIAN

     PFPC Trust Company, an indirect  wholly-owned subsidiary of PNC Bank Corp.,
will succeed PNC Bank, National Association ("PNC Bank") as the Fund's custodian
pursuant to an assignment. PNC Bank will continue to provide certain services to
PFPC Trust  Company.  PFPC  serves as the  Fund's  transfer  agent and  dividend
disbursing  agent.  The  principal  offices of PFPC are located at 400  Bellevue
Parkway,  Wilmington, Delaware 19809. PFPC may enter into shareholders servicing
agreements  with  registered   broker-dealers   who  have  entered  into  dealer
agreements  with the  Distributor  ("Authorized  Dealers")  for the provision of
certain shareholder support services to customers of such Authorized Dealers who
are shareholders of the Fund. The services  provided and the fees payable by the
Fund for these services are described in the Statement of Additional Information
under "Investment Advisory, Distribution and Servicing Arrangements."

                                       9
<PAGE>

EXPENSES

     The  expenses  of the  Fund  are  deducted  from its  total  income  before
dividends  are  paid.  Any  general   expenses  of  RBB  that  are  not  readily
identifiable  as belonging to a particular  investment  portfolio of RBB will be
allocated  among all  investment  portfolios  of RBB based upon the relative net
assets of the investment  portfolios.  The Institutional  Class of the Fund pays
its own  distribution  fees,  if any,  and may pay a  different  share  of other
expenses than other  classes  (excluding  advisory and custodial  fees) if those
expenses are actually incurred in a different amount by the Institutional  Class
or if it receives different services.

     The  Adviser  may  assume  expenses  of the Fund from time to time.  To the
extent any service  providers  assume  expenses of the Fund,  such assumption of
expenses will have the effect of lowering the Fund's  overall  expense ratio and
increasing its yield to investors.

HOW TO PURCHASE SHARES
- --------------------------------------------------------------------------------

GENERAL

     Shares representing interests in the Fund are offered continuously for sale
by the  Distributor.  Shares  may  be  purchased  initially  by  completing  the
application  included in this  Prospectus and forwarding the  application to the
Fund's transfer agent,  PFPC.  Purchases of Shares may be effected by wire to an
account to be specified by PFPC or by mailing a check or Federal  Reserve Draft,
payable to the order of "The  Boston  Partners  Micro Cap Value  Fund," c/o PFPC
Inc.,  P.O. Box 8852,  Wilmington,  Delaware  19899-8852.  The name of the Fund,
Boston  Partners Micro Cap Value Fund,  must also appear on the check or Federal
Reserve Draft. Shareholders may not purchase shares of the Boston Partners Micro
Cap Value Fund with a check  issued by a third  party and  endorsed  over to the
Fund.  Federal  Reserve Drafts are available at national banks or any state bank
which is a member of the Federal Reserve System. Initial investments in the Fund
must be at least  $100,000 and subsequent  investments  must be at least $5,000.
For purposes of meeting the minimum initial purchase,  clients which are part of
endowments,  foundation  or other  related  groups may be  aggregated.  The Fund
reserves  the right to suspend the offering of Shares for a period of time or to
reject any purchase order. As of the date of this  Prospectus,  the Fund intends
to suspend  the  offering of Shares upon the Fund's  attaining  $300  million in
total assets.

     Shares may be purchased on any  Business  Day. A "Business  Day" is any day
that the New York  Stock  Exchange,  Inc.  (the  "NYSE")  is open for  business.
Currently,  the NYSE is closed on weekends and New Year's Day, Dr. Martin Luther
King, Jr. Day,  Presidents' Day, Good Friday,  Memorial Day,  Independence  Day,
Labor Day,  Thanksgiving  Day and Christmas  Day and on the preceding  Friday or
subsequent Monday when one of these holidays falls on a Saturday or Sunday.

     The price paid for Shares  purchased  initially  or  acquired  through  the
exercise of any exchange privilege is based on the net asset value next computed
after a purchase  order is received by the Fund or its agents prior to the close
of the NYSE on such day (generally 4:00 p.m.  Eastern Time).  Orders received by
the Fund or its  agents  after the close of the NYSE are priced at the net asset
value next  determined  on the  following  Business Day. In those cases where an
investor  pays for Shares by check,  the  purchase  will be  effected at the net
asset value next determined  after the Fund or its agents receives the order and
the completed application.

     Shares  may  be  purchased  and  subsequent  investments  may  be  made  by
principals  and  employees of the Adviser,  and by their  spouses and  children,
either  directly or through their  individual  retirement  accounts,  and by any
pension and  profit-sharing  plan of the Adviser,  without  being subject to the
minimum investment limitations.

                                       10
<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK]
<PAGE>
<TABLE>
<CAPTION>
 BOSTON PARTNERS MICRO CAP VALUE FUND          bp
          (INSTITUTIONAL CLASS)                BOSTON PARTNERS ASSET MANAGEMENT, L.P.

<S>                        <C>
ACCOUNT APPLICATION
PLEASE NOTE: Do not use this form to open a retirement plan account. For an IRA
application or help with this Application, please call 1-888-261-4073.

+--------------+           (Please check the appropriate box(es) below.)
| 1            |           |_|  Individual     |_|  Joint Tenant     |_|  Other
| Account      |
| Registration:|           ______________________________________________________________________________________________
+--------------+           Name                                       SOCIAL SECURITY NUMBER OR TAX ID # OF PRIMARY OWNER

                           ______________________________________________________________________________________________
                           NAME OF JOINT OWNER                        JOINT OWNER SOCIAL SECURITY NUMBER OR TAX ID #

                           For joint accounts, the account registrants will be joint tenants with right of
                           survivorship and not tenants in common unless tenants in common or community property
                           registrations are requested.


GIFT TO MINOR:             |_|  UNIFORM GIFTS/TRANSFER TO MINOR'S ACT

                           ______________________________________________________________________________________________
                           NAME OF ADULT CUSTODIAN (ONLY ONE PERMITTED)

                           ______________________________________________________________________________________________
                           NAME OF MINOR (ONLY ONE PERMITTED)

                           ______________________________________________________________________________________________
                           MINOR'S SOCIAL SECURITY NUMBER AND DATE OF BIRTH


CORPORATION,
PARTNERSHIP, TRUST
OR OTHER ENTITY:
                           ______________________________________________________________________________________________
                           NAME OF CORPORATION, PARTNERSHIP, OR OTHER                 NAME(S) OF TRUSTEE(S)

                           ______________________________________________________________________________________________
                           TAXPAYER IDENTIFICATION NUMBER

+--------------+           ______________________________________________________________________________________________
| 2            |           STREET OR P.O. BOX AND/OR APARTMENT NUMBER
| Mailing      |
| Address:     |           ______________________________________________________________________________________________
+--------------+           CITY                                    STATE                       ZIP CODE

                           ______________________________________________________________________________________________
                           DAY PHONE NUMBER                                               EVENING PHONE NUMBER


+--------------+           Minimum initial investment of $100,000.     Amount of investment $____________
| 3            |           
| Investment   |           Make the check payable to Boston Partners Micro Cap Value Fund.
| Information: |           
+--------------+           Shareholders may not purchase shares of this Fund with a check issued by a third party and 
                           endorsed over to the Fund.
                           

DISTRIBUTION               NOTE: Dividends and capital gains may be reinvested or paid by check. If no options are selected
OPTIONS:                   below, both dividends and capital gains will be reinvested in additional Fund shares.

                           DIVIDENDS:  Pay by check |_|   Reinvest |_|   CAPITAL GAINS:  Pay by check |_|   Reinvest |_|

<PAGE>

+--------------+           To use this option, you must initial the appropriate line below.
| 4            |           I authorize the Transfer Agent to accept instructions from any persons to redeem or exchange 
| Telephone    |           shares in my account(s) by telephone in accordance with the procedures and conditions set 
| Redemption:  |           forth in the Fund's current prospectus.
+--------------+


                           _____________________      _______________    Redeem shares, and send the proceeds
                           individual initial         joint initial      to the address of record.


                           _____________________      _______________    Exchange shares for shares of The Boston
                           individual initial         joint initial      Partners Large Cap Value Fund, Mid Cap
                                                                         Value Fund, Bond Fund or Market Neutral Fund.

+--------------+           The Automatic Investment Plan which is available to shareholders of the Fund,
| 5            |           makes possible regularly scheduled purchases of Fund shares to allow
| Automatic    |           dollar-cost averaging. The Fund's Transfer Agent can arrange for an amount
| Investment   |           of money selected by you to be deducted from your checking account and used
| Plan:        |           to purchase shares of the Fund.
+--------------+
                           Please debit $________ from my checking account (named below) on or about the
                           20th of the month. PLEASE ATTACH AN UNSIGNED, VOIDED CHECK.

                           |_| Monthly   |_| Every Alternate Month   |_| Quarterly   |_| Other

                           ______________________________________________________________________________________________
BANK OF RECORD:            BANK NAME                                            STREET ADDRESS OR P.O. BOX

                           ______________________________________________________________________________________________
                           CITY                       STATE                                       ZIP CODE

                           ______________________________________________________________________________________________
                           BANK ABA NUMBER                                             BANK ACCOUNT NUMBER


+--------------+           The undersigned warrants that I (we) have full authority and, if a natural person, I (we) am 
| 6            |           (are) of legal age to purchase shares pursuant to this Account Application, and I (we) have 
|              |           received a current prospectus for the Fund in which I (we) am (are) investing.
| Signatures:  |
+--------------+           Under the Interest and Dividend Tax Compliance Act of 1983, the Fund is required
                           to have the following  certification:

                           Under penalties of perjury, I certify that:

                           (1) The number shown on this form is my correct taxpayer identification number (or I am
                           waiting for a number to be issued to), and

                           (2) I am not subject to backup withholding because (a) I am exempt from backup withholding,
                           or (b) I have not been notified by the Internal Revenue Service that I am subject to 31%
                           backup withholding as a result of a failure to report all interest or dividends, or (c) the
                           IRS has notified me that I am no longer subject to backup withholding.

                           NOTE: YOU MUST CROSS OUT ITEM (2) ABOVE IF YOU HAVE BEEN NOTIFIED BY THE IRS THAT YOU ARE
                           CURRENTLY SUBJECT TO BACKUP WITHHOLDING BECAUSE YOU HAVE FAILED TO REPORT ALL INTEREST AND
                           DIVIDENDS ON YOUR TAX RETURN. THE INTERNAL REVENUE SERVICE DOES NOT REQUIRE YOUR CONSENT TO
                           ANY PROVISION OF THIS DOCUMENT OTHER THAN THE CERTIFICATION REQUIRED TO AUDIT BACKUP
                           WITHHOLDING.

                           ______________________________________________________________________________________________
                           SIGNATURE OF APPLICANT                                       DATE

                           ______________________________________________________________________________________________
                           PRINT NAME                                           TITLE (IF APPLICABLE)

                           ______________________________________________________________________________________________
                           SIGNATURE OF JOINT OWNER                                     DATE

                           ______________________________________________________________________________________________
                           PRINT NAME                                           TITLE (IF APPLICABLE)


                           (If you are signing for a corporation, you must indicate corporate office or title. If you
                           wish additional signatories on the account, please include a corporate resolution. If signing
                           as a fiduciary, you must indicate capacity.)

                           For information on additional options, such as IRA Applications, rollover requests for
                           qualified retirement plans, or for wire instructions, please call us at 1-888-261-4073.

                           MAIL COMPLETED ACCOUNT APPLICATION AND CHECK TO:   THE BOSTON PARTNERS MICRO CAP VALUE FUND
                                                                              C/O PFPC INC.
                                                                              P.O. BOX 8852
                                                                              WILMINGTON, DE 19899-8852
</TABLE>
<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>

     An investor may also purchase  Shares by having his bank or his broker wire
Federal Funds to PFPC. An investor's bank or broker may impose a charge for this
service.  The Fund does not currently impose a service charge for effecting wire
transfers  but  reserves  the right to do so in the  future.  In order to ensure
prompt receipt of an investor's Federal Funds wire for an initial investment, it
is important that an investor follows these steps:

         A. Telephone the Fund's transfer agent, PFPC, toll-free (888) 261-4073,
     and provide PFPC with your name, address, telephone number, Social Security
     or Tax Identification  Number,  the Fund selected,  the amount being wired,
     and by which bank.  PFPC will then provide an investor  with a Fund account
     number.  Investors with existing  accounts should also notify PFPC prior to
     wiring funds.

         B. Instruct your bank or broker to wire the specified amount,  together
     with your assigned account number, to PFPC's account with PNC Bank:

                  PNC Bank, N.A. Philadelphia, PA 19103
                  ABA NUMBER: 0310-0005-3
                  CREDITING ACCOUNT NUMBER: 86-1108-2507
                  FROM: (name of investor)
                  ACCOUNT NUMBER: (Investor's account number with the Fund)
                  FOR PURCHASE OF: (name of the Fund)
                  AMOUNT: (amount to be invested)

         C. Fully complete and sign the  application  and mail it to the address
     shown thereon.  PFPC will not process  purchases  until it receives a fully
     completed and signed application.

     For subsequent investments, an investor should follow steps A and B above.

AUTOMATIC INVESTING

     Additional  investments in Shares may be made  automatically by authorizing
the Fund's  transfer agent to withdraw  funds from your bank account.  Investors
desiring to  participate  in the  automatic  investing  program  should call the
Fund's transfer agent, PFPC, at (888) 261-4073 to obtain the appropriate forms.

HOW TO REDEEM AND EXCHANGE SHARES
- --------------------------------------------------------------------------------

REDEMPTION BY MAIL

     Shareholders may redeem for cash some or all of their Shares of the Fund at
any time.  To do so, a written  request in proper form must be sent  directly to
Boston Partners Micro Cap Value Fund, c/o PFPC Inc., P.O. Box 8852,  Wilmington,
Delaware 19899-8852. There is no charge for a redemption, unless the Shareholder
has held his or her Shares for less than one year,  upon which a fee equal to 1%
of the net asset value of the Shares  redeemed at the time of redemption will be
imposed.

     A request for  redemption  must be signed by all persons in whose names the
Shares  are   registered.   Signatures  must  conform  exactly  to  the  account
registration.  If the proceeds of the redemption would exceed $10,000, or if the
proceeds are not to be paid to the record owner at the record address, or if the
shareholder is a corporation, partnership, trust or fiduciary, signature(s) must
be  guaranteed  according  to the  procedures  described  below under  "Exchange
Privilege."

     Generally,  a properly signed written  request with any required  signature
guarantee  is all that is required  for a  redemption.  In some cases,  however,
other  documents may be  necessary.  In the case of  shareholders  holding share
certificates,  the certificates for the shares being redeemed must accompany the
redemption  request.  Additional  documentary  evidence  of  authority  is  also
required by the Fund's transfer agent in the event  redemption is requested by a
corporation, partnership, trust, fiduciary, executor or administrator.

                                       11
<PAGE>

TRANSACTION FEE IMPOSED ON CERTAIN REDEMPTIONS

     The Fund requires the payment of a transaction fee on redemptions of Shares
of the Fund held for less than one year equal to 1.00% of the net asset value of
such Shares redeemed at the time of redemption.  This additional transaction fee
is paid to the Fund, not to the adviser,  distributor or transfer  agent.  It is
not a sales charge or a contingent  deferred  sales  charge.  The purpose of the
additional   transaction  fee  is  to  indirectly  allocate   transaction  costs
associated with redemptions to those investors making  redemptions after holding
their shares for a short period,  thus protecting existing  shareholders.  These
costs  include:  (1)  brokerage  costs;  (2) market  impact  costs -- i.e.,  the
decrease  in  market  prices  which  may  result  when  the Fund  sells  certain
securities  in order  to raise  cash to meet  the  redemption  request;  (3) the
realization of capital gains by the other  shareholders in the Fund; and (4) the
effect of the "bid-ask" spread in the over-the-counter  market. The 1.00% amount
represents  the Fund's  estimate of the  brokerage and other  transaction  costs
which may be incurred by the Fund in  disposing  of stocks in which the Fund may
invest.  Without the  additional  transaction  fee, the Fund would  generally be
selling  its shares at a price less than the cost to the Fund of  acquiring  the
portfolio  securities  necessary  to maintain  its  investment  characteristics,
resulting in reduced  investment  performance for all  shareholders in the Fund.
With the additional transaction fee, the transaction costs of selling additional
stocks are not borne by all existing  shareholders,  but the source of funds for
these costs is the transaction fee paid by those investors making redemptions.

INVOLUNTARY REDEMPTION

     The Fund reserves the right to redeem a  shareholder's  account at any time
the  net  asset  value  of the  account  falls  below  $500 as the  result  of a
redemption or an exchange request. Shareholders will be notified in writing that
the value of their account is less than $500 and will be allowed 30 days to make
additional investments before the redemption is processed.

PAYMENT OF REDEMPTION PROCEEDS

     With the  exception  of  redemptions  to which  the 1.00%  transaction  fee
applies,  the redemption  price is the net asset value per share next determined
after the request for  redemption  is received in proper form by the Fund or its
agents.  For redemptions to which the additional  transaction  fee applies,  the
redemption  price is the net asset  value per share  next  determined  after the
request  for  redemption  is  received in proper form by the Fund or its agents,
less an amount  equal to 1.00% of the net asset  value of such  Shares  redeemed
that the  shareholder  has held for less  than  one  year.  Payment  for  Shares
redeemed is made by check mailed within seven days after  acceptance by the Fund
or its agents of the request and any other necessary  documents in proper order.
Such payment may be postponed or the right of  redemption  suspended as provided
by the 1940 Act. If the Shares to be redeemed  have been  recently  purchased by
check, the Fund's transfer agent may delay mailing a redemption check, which may
be a period of up to 15 days from the  purchase  date,  pending a  determination
that the check has  cleared.  The Fund has  elected to be governed by Rule 18f-1
under the 1940 Act so that a portfolio is obligated to redeem its shares  solely
in cash up to the lesser of  $250,000  or 1% of its net asset  value  during any
90-day period for any one shareholder of a portfolio.

EXCHANGE PRIVILEGE

     The exchange  privilege is available to shareholders  residing in any state
in which the Shares  being  acquired  may be legally  sold.  A  shareholder  may
exchange  Shares  of the Fund  for  Institutional  Shares  of any  other  Boston
Partners Fund of RBB,  subject to the  restrictions  described  under  "Exchange
Privilege Limitations." Such exchange will be effected at the net asset value of
the  exchanged  Fund and the net asset  value of the Fund  being  acquired  next
determined after receipt of a request for an exchange by the Fund or its agents.
An exchange of Shares will be treated as a sale for federal income tax purposes.
See  "Taxes." A  shareholder  wishing to make an exchange may do so by sending a
written request to PFPC.

                                       12
<PAGE>

     If the exchanging  shareholder does not currently own Institutional  Shares
of the Boston Partners Fund into which he would like to exchange,  a new account
will be  established  with the same  registration,  dividend  and  capital  gain
options  as the  account  from  which  shares are  exchanged,  unless  otherwise
specified  in writing  by the  shareholder  with all  signatures  guaranteed.  A
signature  guarantee  may be  obtained  from a domestic  bank or trust  company,
broker, dealer, clearing agency or savings association who are participants in a
medallion program recognized by the Securities Transfer  Association.  The three
recognized  medallion programs are Securities  Transfer Agents Medallion Program
(STAMP),  Stock Exchanges  Medallion Program (SEMP) and New York Stock Exchange,
Inc. Medallion Signature Program (MSP).  Signature  guarantees that are not part
of these programs will not be accepted.  The exchange  privilege may be modified
or  terminated  at any time, or from time to time, by RBB, upon 60 days' written
notice to shareholders.

     If an exchange is to a new account in the acquired  Fund,  the dollar value
of Institutional  Shares acquired must equal or exceed that Fund's minimum for a
new account;  if to an existing  account,  the dollar value must equal or exceed
that Fund's  minimum for  subsequent  investments.  If any amount remains in the
Fund from which the exchange is being made,  such amount must not drop below the
minimum account value required by the Fund.

EXCHANGE PRIVILEGE LIMITATIONS

     The Fund's exchange privilege is not intended to afford  shareholders a way
to speculate on  short-term  movements in the market.  Accordingly,  in order to
prevent excessive use of the exchange privilege that may potentially disrupt the
management of the Fund and increase  transaction costs, the Fund has established
a policy of limiting excessive exchange activity.

     Shareholders are entitled to six (6) exchange redemptions (at least 30 days
apart)  from the Fund  during any  twelve-month  period.  Notwithstanding  these
limitations,  the  Fund  reserves  the  right to  reject  any  purchase  request
(including  purchases by exchange)  that is deemed to be disruptive to efficient
portfolio management.

TELEPHONE TRANSACTIONS

     In order to request a telephone exchange or redemption,  a shareholder must
have  completed  and  returned  an account  application  containing  a telephone
election.  To add a telephone  option to an existing account that previously did
not provide for this option, a Telephone  Authorization  Form must be filed with
PFPC.  This form is available  from PFPC.  Once this election has been made, the
shareholder  may simply  contact  PFPC by  telephone  to request the exchange or
redemption by calling (888)  261-4073.  Neither RBB, the Fund, the  Distributor,
the  Administrator  nor any  other  Fund  agent  will be  liable  for any  loss,
liability,  cost or expense for following RBB's telephone transaction procedures
described  below or for following  instructions  communicated  by telephone that
they reasonably believe to be genuine.

     RBB's telephone transaction  procedures include the following measures: (1)
requiring the appropriate  telephone  transaction privilege forms; (2) requiring
the  caller to provide  the names of the  account  owners,  the  account  social
security number and name of the Fund, all of which must match RBB's records; (3)
requiring RBB's service representative to complete a telephone transaction form,
listing  all of the above  caller  identification  information;  (4)  permitting
exchanges only if the two account  registrations  are  identical;  (5) requiring
that  redemption  proceeds be sent only by check to the account owners of record
at the  address of  record,  or by wire only to the owners of record at the bank
account  of  record;  (6)  sending a  written  confirmation  for each  telephone
transaction  to the owners of record at the  address of record  within  five (5)
Business Days of the call; and (7) maintaining  tapes of telephone  transactions
for six months, if the Fund elects to record shareholder telephone transactions.
For  accounts  held of record by  broker-dealers  (other than the  Distributor),
financial  institutions,   securities  dealers,  financial  planners  and  other
industry  professionals,  additional  documentation or information regarding the
scope of a caller's authority is required.  Finally, for telephone  transactions
in accounts held jointly, additional information regarding other account holders
is required. Telephone transactions will not be permitted in connection with IRA
or other  retirement  plan accounts or by an  attorney-in-fact  under a power of
attorney.

                                       13
<PAGE>

NET ASSET VALUE
- --------------------------------------------------------------------------------

     The net asset values for each class of a fund are  calculated by adding the
value of the  proportionate  interest of the class in a fund's cash,  securities
and other  assets,  deducting  actual and accrued  liabilities  of the class and
dividing the result by the number of  outstanding  shares of the class.  The net
asset value of each class are calculated  independently of each other class. The
net asset values are calculated as of the close of regular  trading on the NYSE,
generally 4:00 p.m. Eastern Time on each Business Day.

     Valuation of securities held by the Fund is as follows:  securities  traded
on a national  securities  exchange or on the NASDAQ  National Market System are
valued at the last reported sale price that day; securities traded on a national
securities exchange or on the NASDAQ National Market System for which there were
no sales on that day and securities traded on other over-the-counter markets for
which market  quotations are readily available are valued at the mean of the bid
and asked prices;  and  securities  for which market  quotations are not readily
available  are valued at fair  market  value as  determined  in good faith by or
under the  direction of RBB's Board of Directors.  The amortized  cost method of
valuation may also be used with respect to debt  obligations  with sixty days or
less remaining to maturity.

     With the approval of RBB's Board of  Directors,  the Fund may use a pricing
service,  bank or broker-dealer  experienced in such matters to value the Fund's
securities. A more detailed discussion of net asset value and security valuation
is contained in the Statement of Additional Information.

DIVIDENDS AND DISTRIBUTIONS
- --------------------------------------------------------------------------------

     The Fund will distribute substantially all of the net investment income and
net realized capital gains, if any, of the Fund to the Fund's shareholders.  All
distributions  are  reinvested  in the form of  additional  full and  fractional
Shares unless a shareholder elects otherwise.

     The Fund will declare and pay dividends from net investment income annually
and will pay them in the calendar year in which they are declared,  generally in
December.  Net realized capital gains (including net short-term  capital gains),
if any, will be distributed at least annually.

TAXES
- --------------------------------------------------------------------------------

     The  following  discussion is only a brief summary of some of the important
tax considerations  generally affecting the Fund and its shareholders and is not
intended as a substitute for careful tax planning. Accordingly, investors in the
Fund should consult their tax advisers with specific  reference to their own tax
situation.

     The Fund will elect to be taxed as a  regulated  investment  company  under
Subchapter M of the Internal  Revenue Code of 1986,  as amended.  So long as the
Fund qualifies for this tax treatment, it will be relieved of federal income tax
on amounts  distributed to  shareholders,  but  shareholders,  unless  otherwise
exempt, will pay income or capital gains taxes on amounts so distributed (except
distributions  that are  treated as a return of capital)  regardless  of whether
such distributions are paid in cash or reinvested in additional shares.

     Distributions  out of the "net capital  gain" (the excess of net  long-term
capital  gain over net  short-term  capital  loss),  if any, of the Fund will be
taxed to shareholders as long-term capital gain regardless of the length of time
a shareholder has held his Shares,  whether such gain was reflected in the price
paid for the Shares,  or whether  such gain was  attributable  to bonds  bearing
tax-exempt interest.  All other  distributions,  to the extent they are taxable,
are taxed to shareholders as ordinary income.

     RBB will send written  notices to shareholders  annually  regarding the tax
status of distributions made by the Fund.  Dividends declared in December of any
year payable to shareholders of record on a specified date in such a month will

                                       14
<PAGE>

be deemed to have been  received by the  shareholders  on December 31,  provided
such dividends are paid during  January of the following  year. The Fund intends
to make  sufficient  actual  or  deemed  distributions  prior to the end of each
calendar year to avoid liability for federal excise tax.

     Investors  should be careful to  consider  the tax  implications  of buying
shares just prior to a distribution.  The price of shares purchased at that time
will  reflect  the  amount  of the  forthcoming  distribution.  Those  investors
purchasing shares just prior to a distribution will nevertheless be taxed on the
entire amount of the  distribution  received,  although the  distribution is, in
effect, a return of capital.

     Shareholders  who exchange  shares  representing  interests in one Fund for
shares  representing  interests in another Fund will generally recognize capital
gain or loss for federal income tax purposes.

     Shareholders  who are  nonresident  alien  individuals,  foreign  trusts or
estates,  foreign  corporations  or  foreign  partnerships  may  be  subject  to
different  U.S.  Federal  income  tax  treatment  and should  consult  their tax
advisers.

MULTI-CLASS STRUCTURE
- --------------------------------------------------------------------------------

     The Fund  offers  one other  class of  shares,  Investor  Shares,  which is
offered  directly to  individual  investors  pursuant to a separate  prospectus.
Shares of each class  represent  equal pro rata interests in the Fund and accrue
dividends and calculate net asset value and  performance  quotations in the same
manner.  The Fund will quote  performance of the Investor Shares separately from
Institutional  Shares.  Because of different  expenses paid by the Institutional
Shares,  the total  return on such shares can be  expected,  at any time,  to be
different than the total return on Investor Shares. Information concerning other
classes may be obtained by calling the Fund at (800) 261-4073.

DESCRIPTION OF SHARES
- --------------------------------------------------------------------------------

     RBB has authorized  capital of thirty billion shares of Common Stock, $.001
par value per share,  of which 18.326  billion  shares are currently  classified
into 97 different  classes of Common Stock.  See  "Description of Shares" in the
Statement of Additional Information."

     THIS  PROSPECTUS AND THE STATEMENT OF ADDITIONAL  INFORMATION  INCORPORATED
HEREIN  RELATE  PRIMARILY TO BOSTON  PARTNERS  MICRO CAP VALUE FUND AND DESCRIBE
ONLY THE  INVESTMENT  OBJECTIVE  AND POLICIES,  OPERATIONS,  CONTRACTS AND OTHER
MATTERS RELATING TO BOSTON PARTNERS MICRO CAP VALUE FUND.

     Each  share  that   represents  an  interest  in  the  Fund  has  an  equal
proportionate interest in the assets belonging to the Fund with each other share
that  represents  an  interest  in the Fund,  even where a share has a different
class  designation  than  another  share  representing  an interest in the Fund.
Shares of the Fund do not have preemptive or conversion rights.  When issued for
payment  as  described  in this  Prospectus,  Shares  will  be  fully  paid  and
non-assessable.

     RBB  currently  does not intend to hold  annual  meetings  of  shareholders
except  as  required  by the 1940 Act or other  applicable  law.  The law  under
certain circumstances provides shareholders with the right to call for a meeting
of shareholders to consider the removal of one or more directors.  To the extent
required by law, RBB will assist in shareholder communication in such matters.

     Holders of Shares of the Fund will vote in the  aggregate  and not by class
on all matters, except where otherwise required by law. Further, shareholders of
all investment portfolios of RBB will vote in the aggregate and not by portfolio
except as otherwise  required by law or when the Board of  Directors  determines
that the matter to be voted upon affects only the interests of the  shareholders
of  a  particular  investment  portfolio.   (See  the  Statement  of  Additional
Information under "Additional  Information  Concerning Fund Shares" for examples
when the 1940 Act requires voting

                                       15
<PAGE>

by investment  portfolio or by class.)  Shareholders of the Fund are entitled to
one vote for each full  share  held  (irrespective  of class or  portfolio)  and
fractional  votes for fractional  shares held.  Voting rights are not cumulative
and, accordingly, the holders of more than 50% of the aggregate shares of Common
Stock of the Fund may elect all of the directors.

     As of November 16, 1998, to the Fund's knowledge,  no person held of record
or beneficially 25% or more of the outstanding shares of all classes of RBB.

OTHER INFORMATION
- --------------------------------------------------------------------------------

REPORTS AND INQUIRIES

     Shareholders  will receive  unaudited  semi-annual  reports  describing the
Fund's  investment   operations  and  annual  financial  statements  audited  by
independent accountants. Shareholder inquiries should be addressed to PFPC Inc.,
the Fund's transfer agent, Bellevue Park Corporate Center, 400 Bellevue Parkway,
Wilmington, Delaware 19809, toll-free (888) 261-4073.

SHARE CERTIFICATES

     In  the  interest  of  economy  and  convenience,   physical   certificates
representing Shares in the Fund are not normally issued.

FUTURE PERFORMANCE INFORMATION

     From  time to time,  the  Fund may  advertise  its  performance,  including
comparisons  to other  mutual funds with similar  investment  objectives  and to
stock or other relevant indices.  All such  advertisements will show the average
annual total return over one, five and ten year periods or, if such periods have
not yet elapsed,  shorter  periods  corresponding  to the life of the Fund. Such
total  return  quotations  will be computed by finding  the  compounded  average
annual total  return for each time period that would equate the assumed  initial
investment of $1,000 to the ending redeemable value, net of fees, according to a
required standardized  calculation.  The standard calculation is required by the
SEC to provide consistency and comparability in investment company  advertising.
The Fund may also from time to time  include in such  advertising  an  aggregate
total return figure or a total return figure that is not calculated according to
the  standardized  formula  in order  to  compare  more  accurately  the  Fund's
performance with other measures of investment  return.  For example,  the Fund's
total return may be compared with data published by Lipper Analytical  Services,
Inc., CDA  Investment  Technologies,  Inc. or  Weisenberger  Investment  Company
Service,  or  with  the  performance  of the  Russell  2000  Index.  Performance
information  may also include  evaluation of the Fund by  nationally  recognized
ranking services and information as reported in financial  publications  such as
Business  Week,  Fortune,   Institutional  Investor,  Money  Magazine,   Forbes,
Barron's,  The Wall  Street  Journal,  The New York  Times,  or other  national,
regional or local publications.  All advertisements  containing performance data
will include a legend  disclosing  that such  performance  data  represents past
performance and that the investment  return and principal value of an investment
will fluctuate so that an investor's Shares, when redeemed, may be worth more or
less than their original cost.

                                       16
<PAGE>



                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>


                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>


NO  PERSON  HAS  BEEN   AUTHORIZED   TO  GIVE  ANY   INFORMATION   OR  MAKE  ANY
REPRESENTATIONS  NOT  CONTAINED  IN THIS  PROSPECTUS  OR IN RBB'S  STATEMENT  OF
ADDITIONAL INFORMATION  INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE
OFFERING MADE BY THIS  PROSPECTUS  AND, IF GIVEN OR MADE,  SUCH  REPRESENTATIONS
MUST NOT BE RELIED UPON AS HAVING  BEEN  AUTHORIZED  BY RBB OR ITS  DISTRIBUTOR.
THIS  PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY RBB OR BY THE DISTRIBUTOR IN
ANY JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY BE MADE.


                        ---------------------------------
                                TABLE OF CONTENTS
                                                                          PAGE
                                                                          ----
EXPENSE TABLE ..........................................................     2
FINANCIAL HIGHLIGHTS ...................................................     3
INTRODUCTION ...........................................................     5
INVESTMENT OBJECTIVES AND POLICIES .....................................     5
INVESTMENT LIMITATIONS .................................................     7
RISK FACTORS ...........................................................     7
YEAR 2000 ..............................................................     8
MANAGEMENT .............................................................     8
HOW TO PURCHASE SHARES .................................................    10
HOW TO REDEEM AND EXCHANGE SHARES. .....................................    11
NET ASSET VALUE. .......................................................    14
DIVIDENDS AND DISTRIBUTIONS. ...........................................    14
TAXES. .................................................................    14
MULTI-CLASS STRUCTURE. .................................................    15
DESCRIPTION OF SHARES. .................................................    15
OTHER INFORMATION. .....................................................    16

INVESTMENT ADVISER                                
Boston Partners Asset Management, L.P.
Boston, Massachusetts

CUSTODIAN
PFPC Trust Company
Wilmington, Delaware

TRANSFER AGENT AND ADMINISTRATOR
PFPC Inc.
Wilmington, Delaware

DISTRIBUTOR
Provident Distributors, Inc.
West Conshohocken, Pennsylvania

COUNSEL
Drinker Biddle & Reath LLP
Philadelphia, Pennsylvania

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers LLP
Philadelphia, Pennsylvania


[LOGO OMITTED]

<PAGE>
PROSPECTUS
DECEMBER 29, 1998
                                 BOSTON PARTNERS
                                    MICRO CAP
                                   VALUE FUND
                                (INVESTOR SHARES)


bp
BOSTON PARTNERS ASSET MANAGEMENT, L.P.
[LOGO GRAPHIC OMITTED]

<PAGE>

                      BOSTON PARTNERS MICRO CAP VALUE FUND
                                (INVESTOR SHARES)
                                       OF
                               THE RBB FUND, INC.

     Boston  Partners  Micro  Cap  Value  Fund  (the  "Fund")  is an  investment
portfolio  of The RBB Fund,  Inc.  ("RBB"),  an open-end  management  investment
company.  The shares of the Investor Class ("Shares") offered by this Prospectus
represent  interests  in the Fund.  The Fund is a  diversified  fund that  seeks
long-term  growth of capital,  with  current  income as a  secondary  objective,
primarily through equity investments, such as common stocks. It seeks to achieve
its  objectives  by investing at least 65% of its total assets in a  diversified
portfolio consisting of equity securities of issuers with market capitalizations
that do not exceed $500 million when  purchased by the Fund,  and  identified by
Boston Partners Asset Management, L.P. (the "Adviser") as equity securities that
it believes possess value characteristics.  The Adviser examines various factors
in determining the value  characteristics  of such issuers,  including,  but not
limited to, price to book value ratios and price to earnings ratios. These value
characteristics  are  examined  in the  context of the  issuer's  operating  and
financial fundamentals such as return on equity, earnings growth and cash flow.

     This Prospectus contains  information that a prospective  investor needs to
know before  investing.  Please  keep it for future  reference.  A Statement  of
Additional  Information,  dated  December  29,  1998,  has been  filed  with the
Securities  and Exchange  Commission  and is  incorporated  by reference in this
Prospectus.  It may be obtained  free of charge  from the Fund by calling  (888)
261-4073.  The  Prospectus  and the  Statement  of  Additional  Information  are
available for reference, along with other related materials, on the SEC Internet
Web Site (http://www.sec.gov).

SHARES OF THE FUND ARE NOT DEPOSITS OR  OBLIGATIONS OF OR GUARANTEED OR ENDORSED
BY PNC BANK,  NATIONAL  ASSOCIATION,  PFPC  TRUST  COMPANY OR ANY OTHER BANK AND
SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT  INSURANCE  CORPORATION,
THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY. INVESTMENTS IN SHARES OF THE FUND
INVOLVE INVESTMENT RISKS, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.

- --------------------------------------------------------------------------------
THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THIS
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------

PROSPECTUS                                                     December 29, 1998

<PAGE>

EXPENSE TABLE
- --------------------------------------------------------------------------------
     The following  table  illustrates  the  shareholder  transaction and annual
operating  expenses  incurred by Investor  Shares of the Fund (after fee waivers
and expense  reimbursements)  for the fiscal  period ended August 31, 1998, as a
percentage of average daily net assets.  An example based on the summary is also
shown.

SHAREHOLDER TRANSACTION EXPENSES

     Maximum Sales Charge Imposed on Purchases ........................    None
                                                                         
     Maximum Sales Charge Imposed on Reinvested Dividends .............    None
                                                                         
     Maximum Deferred Sales Charge ....................................    None
                                                                         
     Redemption Fee(1) ................................................    1.00%
                                                                         
     Exchange Fee .....................................................    None
                                                                         
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)   
                                                                         
     Management Fees (after waivers)2. ................................    0.00%
                                                                         
     12b-1 Fees (after waivers)2 ......................................     .25%
                                                                         
     Other Expenses (after expense reimbursements)(2). ................    1.55%
                                                                           ----
   Total Fund Operating Expenses (after waivers and expense              
     reimbursements)(2) ...............................................    1.80%
                                                                           ====
                                                                        
(1) To prevent the Fund from being adversely  affected by the transaction  costs
    associated with short-term  shareholder  transactions,  the Fund will redeem
    shares  at a price  equal  to the net  asset  value of the  shares,  less an
    additional transaction fee equal to 1.00% of the net asset value of all such
    shares  redeemed  that have been held for less than one year.  Such fees are
    not sales charges or contingent deferred sales charges,  but are retained by
    the Fund for the benefit of all shareholders.

(2) In the absence of fee waivers and expense  reimbursements,  Management  Fees
    would be 1.25%,  Other Expenses  would be 16.44%,  12b-1 Fees would be 0.25%
    and Total Fund Operating Expenses would be 17.94%. Management Fees and 12b-1
    Fees are each based on average daily net assets and are calculated daily and
    paid monthly.

EXAMPLE

     An investor would pay the following  expenses on a $1,000 investment in the
Fund, assuming (1) a 5% annual return and (2) redemption at the end of each time
period (including the 1.00% transaction fee on redemptions made within a year of
purchase):
                                                  ONE   THREE  FIVE       TEN
                                                 YEAR   YEARS  YEARS     YEARS
                                                 ----   -----  -----     -----
     Boston Partners Micro Cap Value Fund .....  $18     $57    $97      $212

     The Fee Table is  designed  to  assist an  investor  in  understanding  the
various  costs and expenses  that an investor in the Fund will bear  directly or
indirectly.  (For more complete  descriptions of the various costs and expenses,
see  "Management"  and  "Distribution  of Shares" below.) The Fee Table reflects
expense  reimbursements  and voluntary waivers of Management Fees and 12b-1 fees
for the Fund, which are expected to be in effect during the current fiscal year.
However, the Adviser, the Distributor and the Fund's other service providers are
under no obligation with respect

                                       2
<PAGE>


to such expense  reimbursements  and waivers and there can be no assurance  that
any future expense  reimbursements  and waivers of Management Fees or 12b-1 Fees
will not vary from the figures reflected in the Fee Table.

     The Example in the Fee Table assumes that all  dividends and  distributions
are  reinvested  and  that the  amounts  listed  under  "Annual  Fund  Operating
Expenses"  remain  the  same in the  years  shown.  THE  EXAMPLE  SHOULD  NOT BE
CONSIDERED A  REPRESENTATION  OF PAST OR FUTURE EXPENSES AND ACTUAL EXPENSES MAY
BE GREATER OR LESS THAN THOSE SHOWN.

FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
     The "Financial  Highlights"  presented  below set forth certain  investment
results for shares of the Investor Class of the Fund for the period July 1, 1998
(date of inception) through August 31, 1998. The financial data included in this
table should be read in  conjunction  with the  financial  statements  and notes
thereto   and   the   unqualified   report   of    PricewaterhouseCoopers    LLP
("PricewaterhouseCoopers"), RBB's independent accountant, which are incorporated
by reference into the Statement of Additional  Information.  Further information
about the  performance  of the  Investor  Class of the Fund is  available in the
Annual Report to Shareholders.  Both the Statement of Additional Information and
the Annual Report to  Shareholders  may be obtained from the Fund free of charge
by calling the telephone number on page 1 of the prospectus.

                                       3
<PAGE>

                       BOSTON PARTNERS MICROCAP VALUE FUND
           (FOR AN INVESTOR SHARE OUTSTANDING THROUGHOUT EACH PERIOD)

                                                                FOR THE PERIOD
                                                                 JULY 1, 1998*
                                                              THROUGH AUGUST 31,
                                                                     1998
                                                              ------------------
                                                                INVESTOR CLASS
                                                              ------------------
Per Share Operating Performance**
Net asset value, beginning of period ........................        $ 10.00
                                                                     -------
Net investment income/(loss) (1) ............................          (0.01)
Net realized and unrealized gain/(loss) on investments(2) ...          (2.36)
                                                                     -------
Net increase/(decrease) in net assets resulting
   from operations ..........................................          (2.37)
                                                                     -------
DIVIDENDS TO SHAREHOLDERS FROM:
Net investment income .......................................             --
Net realized capital gains ..................................             --
                                                                     -------
Net asset value, end of period ..............................          $7.63
                                                                     =======
Total investment return(3)(5) ...............................         (23.70)%
                                                                     =======
Ratios/Supplemental Data
   Net assets, end of period (000) ..........................        $129.00
   Ratio of expenses to average net
     assets***(1)(4) ........................................           1.80%
   Ratio of net investment income/(loss) to
     average net assets***(1) ...............................          (0.66)%
   Portfolio turnover rate**** ..............................          11.97%

    *   Commencement of operations.
   **   Calculated based on shares  outstanding on the first and last day of the
        period, except for dividends and distributions,  if any, which are based
        on actual shares outstanding on the dates of distributions.
  ***   Annualized.
 ****   Not annualized.
  (1)   Reflects waivers and reimbursements.
  (2)   The amount shown for a share outstanding throughout the period is not in
        accord with the change in the aggregate  gains and losses in investments
        during the period because of the timing of sales and repurchases of Fund
        shares in relation to fluctuating net asset value during the period.
  (3)   Total  return is  calculated  assuming a purchase of shares on the first
        day and a sale of shares on the last day of the period reported and will
        include  reinvestments  of dividends and  distributions,  if any.  Total
        return is not annualized.
  (4)   Without the waiver of advisory, 12b-1, administration and transfer agent
        fees and without the  reimbursement of certain operating  expenses,  the
        ratio of expenses to average net assets  annualized for the period ended
        August 31, 1998 would have been 18.19% for the Investor Class.
  (5)   Redemption fee of 1.00% is not reflected in total return calculation.

                                       4
<PAGE>

INTRODUCTION
- --------------------------------------------------------------------------------
     RBB is an open-end  management  investment  company  incorporated under the
laws of the State of  Maryland  currently  operating  or  proposing  to  operate
seventeen separate investment portfolios.  The Shares offered by this Prospectus
represent  interests  in the  Boston  Partners  Micro  Cap Value  Fund.  RBB was
incorporated in Maryland on February 29, 1988.

INVESTMENT OBJECTIVES AND POLICIES
- --------------------------------------------------------------------------------
     The Fund's investment  objective is to provide long-term growth of capital,
with  current  income  as  a  secondary  objective,   primarily  through  equity
investments,  such as common stocks.  The Fund seeks to achieve its objective by
investing, under normal market conditions, at least 65% of its total assets in a
diversified  portfolio consisting primarily of equity securities of issuers with
market  capitalizations  that do not exceed $500 million  when  purchased by the
Fund,  and  identified  by the  Adviser as equity  securities  that it  believes
possess value characteristics.

     The Fund generally invests in the equity securities of small companies. The
Adviser  will seek to invest in companies it considers to be well managed and to
have attractive  fundamental  financial  characteristics.  The Adviser  believes
greater potential for price appreciation exists among small companies since they
tend to be less widely  followed by other  securities  analysts  and thus may be
more likely to be  undervalued  by the market.  The Fund may invest from time to
time a portion of its assets, not to exceed 35% (under normal conditions) at the
time of purchase, in companies with considerably larger market capitalizations.

     The Fund presents greater risks than funds that invest in equity securities
of larger  companies  for the  following  reasons:  Companies  in which the Fund
primarily  invests will include those that have limited product lines,  markets,
or financial  resources,  or are dependent  upon a small  management  group.  In
addition,  because these stocks are not well known to the investing  public,  do
not have significant institutional ownership, and are followed by relatively few
securities analysts,  there will normally be less publicly available information
concerning these securities  compared to what is available for the securities of
larger  companies.  Adverse publicity and investor  perceptions,  whether or not
based  on  fundamental  analysis,  can  decrease  the  value  and  liquidity  of
securities held by the Fund. Historically, small capitalization stocks have been
more volatile in price than larger capitalization  stocks. Among the reasons for
the greater price  volatility of these small company stocks are the less certain
growth  prospects of smaller firms, the lower degree of liquidity in the markets
for such stocks, the greater sensitivity of small companies to changing economic
conditions, the fewer market makers and the wider spreads between quoted bid and
asked prices which exist in the over-the-counter market for such stocks. Besides
exhibiting greater volatility,  small company stocks may, to a degree, fluctuate
independently  of larger  company  stocks.  Small company  stocks may decline in
price as large company  stocks rise,  or rise in price as large  company  stocks
decline.  Investors  should therefore expect that the Fund will be more volatile
than, and may fluctuate independently of, broad stock market indices such as the
Standard & Poor's 500 Composite Stock Price Index.

     The  securities  in which the Fund invests will often be traded only in the
over-the-counter market or on a regional securities exchange, may be listed only
in the quotation  service  commonly  known as the "pink  sheets," and may not be
traded  every day or in the volume  typical of trading on a national  securities
exchange.  They may be subject to wide fluctuations in market value. The trading
market for any given security may be  sufficiently  thin as to make it difficult
for the  Fund  to  dispose  of a  substantial  block  of  such  securities.  The
disposition by the Fund of portfolio securities to meet redemptions or otherwise
may require the Fund to sell these  securities  at a discount from market prices
or during  periods when,  in the Adviser's  judgment,  such  disposition  is not
desirable or to make many small sales over a lengthy period of time.

     The   Adviser   examines   various   factors  in   determining   the  value
characteristics  of such issuers,  including,  but not limited to, price to book
value  ratios and price to  earnings  ratios.  These value  characteristics  are
examined in the context of the issuer's  operating  and  financial  fundamentals
such as return on equity, earnings growth and cash flow.

                                       5
<PAGE>

     The Adviser selects securities for the Fund based on a fundamental analysis
of  industries  and  companies,  earning  power and growth and other  investment
criteria.  In general,  the Fund's  investments are broadly  diversified  over a
number of industries and, as a matter of policy, the Fund will not invest 25% or
more of its total assets in any one industry.

     The Fund may invest up to 25% of its total assets in  securities of foreign
issuers, including American Depository Receipts ("ADRs") and European Depository
Receipts   ("EDRs").   Investing  in  securities  of  foreign  issuers  involves
considerations  not  typically   associated  with  investing  in  securities  of
companies  organized  and  operating in the United  States.  Foreign  securities
generally are denominated  and pay dividends or interest in foreign  currencies.
The Fund may hold from time to time various  foreign  currencies  pending  their
investment in foreign  securities or their  conversion  into U.S.  dollars.  The
value of the assets of the Fund as measured in U.S.  dollars  may  therefore  be
affected  favorably or  unfavorably by changes in exchange  rates.  There may be
less publicly available information concerning foreign issuers than is available
with respect to U.S. issuers.  Foreign securities may not be registered with the
U.S. Securities and Exchange  Commission,  and generally,  foreign companies are
not subject to uniform accounting, auditing and financial reporting requirements
comparable  to those  applicable  to U.S.  issuers.  ADRs and EDRs are  receipts
issued  by a U.S.  bank or trust  company  evidencing  ownership  of  underlying
securities issued by a foreign issuer. ADRs and EDRs may be listed on a national
securities  exchange or may trade in the  over-the-counter  market.  ADR and EDR
prices are denominated in U.S. dollars,  even though the underlying security may
be denominated in a foreign currency.  The underlying security may be subject to
foreign  government  taxes  which  would  reduce  the yield on such  securities.
Investments  in such  instruments  involve  risks  similar to those of investing
directly in foreign securities. See "Investment Objectives and Policies--Foreign
Securities" in the Statement of Additional Information.

     The Fund may  invest  the  remainder  of its  total  assets  in  derivative
securities;  debt  securities  issued  by U.S.  banks,  corporations  and  other
business organizations that are investment grade securities; and debt securities
issued by the U.S. Government or government agencies.

     In accordance with the above-mentioned  policies,  the Fund may also invest
in indexed securities,  repurchase  agreements,  reverse repurchase  agreements,
dollar rolls, financial futures contracts,  options on futures contracts and may
lend  portfolio  securities.  See  "Investment  Objectives  and Policies" in the
Statement of Additional Information.

     The Fund may invest in registered investment companies and investment funds
in foreign countries subject to the provisions of the Investment  Company Act of
1940, as amended (the "1940 Act"),  and as discussed in  "Investment  Objectives
and Policies" in the Statement of Additional Information. If the Fund invests in
such investment  companies,  the Fund will bear its  proportionate  share of the
costs incurred by such companies, including investment advisory fees.

     While the Adviser intends to fully invest the Fund's assets at all times in
accordance  with the  above-mentioned  policies,  the Fund reserves the right to
hold up to 100% of its assets,  as a temporary  defensive  measure,  in cash and
eligible U.S.  dollar-denominated  money market  instruments.  The Adviser would
determine when market conditions warrant temporary defensive measures.

     The Fund's  investment  objective and the policies  described  above may be
changed by RBB's Board of Directors  without the affirmative vote of the holders
of a majority of the outstanding Shares representing interests in the Fund.

INVESTMENT LIMITATIONS
- --------------------------------------------------------------------------------
     The  Fund may not  change  the  following  investment  limitations  without
shareholder approval. (A complete list of the investment limitations that cannot
be changed without such a vote of the shareholders is contained in the Statement
of Additional Information under "Investment Objectives and Policies.")

                                       6
<PAGE>

     The Fund may not:

         1.  Purchase the  securities of any one issuer,  other than  securities
     issued  or   guaranteed   by  the  U.S.   Government  or  its  agencies  or
     instrumentalities,  if  immediately  after and as a result of such purchase
     more than 5% of the value of the Fund's  total  assets would be invested in
     the securities of such issuer,  or more than 10% of the outstanding  voting
     securities of such issuer would be owned by the Fund, except that up to 25%
     of the value of the Fund's total assets may be invested  without  regard to
     such limitations.

         2. Purchase any securities  which would cause, at the time of purchase,
     25% or more of the value of the total  assets of the Fund to be invested in
     the obligations of issuers in any single  industry,  provided that there is
     no limitation with respect to investments in U.S. Government obligations.

         3. Borrow  money or issue senior  securities,  except that the Fund may
     borrow from banks and enter into reverse  repurchase  agreements and dollar
     rolls for temporary purposes in amounts up to one-third of the value of its
     total  assets  at the  time of  such  borrowing;  or  mortgage,  pledge  or
     hypothecate  any assets,  except in connection  with any such borrowing and
     then in amounts not in excess of one-third of the value of the Fund's total
     assets at the time of such borrowing. The Fund will not purchase securities
     while its aggregate  borrowings  (including reverse repurchase  agreements,
     dollar  rolls and  borrowings  from banks) are in excess of 5% of its total
     assets.  Securities held in escrow or separate  accounts in connection with
     the Fund's  investment  practices  are not  considered  to be borrowings or
     deemed to be pledged for purposes of this limitation.

     If a percentage  restriction under one of the Fund's investment policies or
restrictions  or the use of assets is  adhered to at the time a  transaction  is
effected, later changes in percentage resulting from changing values will not be
considered a violation  (except with respect to any restrictions  that may apply
to borrowings or senior securities issued by the Fund).

     The Fund  presently has no intention to  participate  as a purchaser in any
initial  public  offering  of  securities  that may  trade at a  premium  in the
secondary market when such a secondary  market exists,  although it reserves the
ability to participate in such offerings in the future.

PORTFOLIO TURNOVER

     The Fund retains the right to sell securities irrespective of how long they
have been held. The Adviser  estimates that the annual turnover in the Fund will
not exceed 150% during the current fiscal year. Such a relatively high portfolio
turnover will be accompanied by relatively high transactional (i.e.,  brokerage)
costs.  It may also result in increased  capital gains  realized by the Fund and
distributed to shareholders.

RISK FACTORS
- --------------------------------------------------------------------------------
     As with other mutual  funds,  there can be no assurance  that the Fund will
achieve its objective.  The net asset value per share of Shares  representing an
interest in the Fund will  fluctuate as the values of its  portfolio  securities
change in response to changing conditions in the equity market. An investment in
the Fund is not intended to constitute a balanced  investment program. As of the
date of this  Prospectus,  U.S. stock markets were trading at or close to record
high levels and there can be no guarantee that such levels will continue.  Other
risk factors are discussed above under "Investment  Objectives and Policies" and
in the Statement of Additional  Information  under  "Investment  Objectives  and
Policies."

     EUROPEAN CURRENCY UNIFICATION. Many European countries are about to adopt a
single  European  currency,  the euro. On January 1, 1999,  the euro will become
legal tender for all countries  participating in the Economic and Monetary Union
("EMU").  A new  European  Central  Bank will be created to manage the  monetary
policy of the new unified  region.  On the same date, the exchange rates will be
irrevocably  fixed between the EMU member  countries.  National  currencies will
continue to  circulate  until they are  replaced by euro coins and bank notes by
the middle of 2002.

                                       7
<PAGE>

     This change is likely to significantly  impact the European capital markets
in which the Fund may invest and may result in the Fund facing  additional risks
in pursuing its investment  objective.  These risks, which include,  but are not
limited  to,  uncertainty  as to  the  proper  tax  treatment  of  the  currency
conversion, volatility of currency exchange rates as a result of the conversion,
uncertainty  as to capital  market  reaction,  conversion  costs that may affect
issuer  profitability  and  creditworthiness,  and lack of participation by some
European  countries,  may increase the  volatility of the Fund's net asset value
per share.

YEAR 2000
- --------------------------------------------------------------------------------
     Like  other  mutual  funds,   financial  and  business   organizations  and
individuals  around  the  world,  the Fund could be  adversely  affected  if the
computer systems used by the Adviser and the Fund's other service providers,  or
persons with whom they deal, do not properly process and calculate  date-related
information  and data  from and after  January  1,  2000.  This  possibility  is
commonly known as the "Year 2000 Problem." The Year 2000 Problem could also hurt
companies whose securities the Fund holds or securities markets  generally.  The
Fund has been advised by the Adviser,  the Administrators and the Custodian that
they are actively  taking steps to address the Year 2000 Problem with respect to
the computer  systems  that they use and to obtain  assurances  that  comparable
steps are being taken by the Fund's other major service  providers.  While there
can be no  assurance  that  the  Fund's  service  providers  will be  Year  2000
compliant,  the Fund's service providers expect that their plans to be compliant
will be achieved.

GENERAL

     Investment  methods  described in this Prospectus are among those which the
Fund has the power to utilize.  Some may be employed on a regular basis;  others
may not be used at all.  Accordingly,  reference  to any  particular  method  or
technique  carries no implication that it will be utilized or, if it is, that it
will be successful.

MANAGEMENT
- --------------------------------------------------------------------------------

BOARD OF DIRECTORS

     The  business  and  affairs  of RBB and the  Fund  are  managed  under  the
direction of RBB's Board of Directors.

INVESTMENT ADVISER

     Boston Partners Asset Management,  L.P.,  located at 28 State Street,  21st
Floor, Boston, Massachusetts 02109, serves as the Fund's investment adviser. The
Adviser  provides  investment  management  and investment  advisory  services to
investment  companies and other institutional  accounts that had aggregate total
assets under management as of October 31, 1998, in excess of $16.0 billion.  The
adviser  is  organized  as a Delaware  limited  partnership  whose sole  general
partner is Boston Partners, Inc., a Delaware corporation.

     Subject to the supervision  and direction of RBB's Board of Directors,  the
Adviser manages the Fund's  portfolio in accordance  with the Fund's  investment
objective and policies,  makes investment  decisions for the Fund, places orders
to purchase and sell securities, and employs professional portfolio managers and
securities  analysts who provide research services to the Fund. For its services
to the Fund,  the Adviser is paid a monthly  advisory  fee computed at an annual
rate of 1.25% of the Fund's  average daily net assets.  The Adviser has notified
RBB, however,  that it intends to limit total Fund operating expenses during the
current fiscal year.

PORTFOLIO MANAGEMENT

     The day-to-day  portfolio  management of the Fund is the  responsibility of
David M. Dabora and Wayne J. Archambo who are portfolio managers of the Adviser.
Prior to taking on day to day responsibilities for the Micro Cap Value Fund, Mr.
Dabora was an assistant portfolio  manager/analyst of the premium equity product
of the Adviser, an all-cap value

                                       8
<PAGE>


institutional product.  Before joining the Adviser in April 1995, Mr. Dabora had
been  employed by The Boston  Company  Asset  Management,  Inc.  since 1991 as a
senior equity analyst. Mr. Dabora has over 11 years of investment experience and
is  a  Chartered  Financial  Analyst.   Mr.  Archambo  oversees  the  investment
activities  of the  Adviser's  $1.5 million of  mid-capitalization  value equity
product,  including  the $120  million  Mid Cap Value  Fund and small cap assets
worth $1.0 billion. Prior to joining the Adviser in April 1995, Mr. Archambo had
been  employed by The Boston  Company  Asset  Management,  Inc.  since 1989 as a
senior  portfolio  manager and a member of that firm's Equity Policy  Committee.
Mr.  Archambo  has over 16 years of  investment  experience  and is a  Chartered
Financial Analyst.

ADMINISTRATOR

     PFPC  Inc.  ("PFPC")  serves  as  administrator  to the Fund and  generally
assists the Fund in all aspects of its administration and operations,  including
matters relating to the maintenance of financial records and accounting. For its
services,  PFPC  receives  a fee  calculated  at an annual  rate of .125% of the
Fund's average daily net assets,  with a minimum  annual fee of $75,000  payable
monthly on a pro rata basis.

TRANSFER AGENT, DIVIDEND DISBURSING AGENT, AND CUSTODIAN

     PFPC Trust Company, an indirect wholly-owned  subsidiary of PNC Bank Corp.,
will succeed PNC Bank, National Association ("PNC Bank") as the Fund's custodian
pursuant to an assignment. PNC Bank will continue to provide certain services to
PFPC Trust  Company.  PFPC  serves as the  Fund's  transfer  agent and  dividend
disbursing  agent.  The  principal  offices of PFPC are located at 400  Bellevue
Parkway,  Wilmington,  Delaware 19809. PFPC may enter into shareholder servicing
agreements  with  registered   broker-dealers   who  have  entered  into  dealer
agreements  with the  Distributor  ("Authorized  Dealers")  for the provision of
certain shareholder support services to customers of such Authorized Dealers who
are shareholders of the Fund. The services  provided and the fees payable by the
Fund for these services are described in the Statement of Additional Information
under "Investment Advisory, Distribution and Servicing Arrangements."

DISTRIBUTOR

     Provident Distributors,  Inc. ("PDI"), with a principal business address at
Four Falls Corporate  Center,  West  Conshohocken,  Pennsylvania  19428, acts as
distributor   for  the  Shares   pursuant  to  a  distribution   agreement  (the
"Distribution Agreement") with RBB on behalf of the Shares.

EXPENSES

     The  expenses  of the  Fund  are  deducted  from its  total  income  before
dividends  are  paid.  Any  general   expenses  of  RBB  that  are  not  readily
identifiable  as belonging to a particular  investment  portfolio of RBB will be
allocated  among all  investment  portfolios  of RBB based upon the relative net
assets of the investment portfolios. The Investor Class of the Fund pays its own
distribution fees, and may pay a different share than the Institutional Class of
other  expenses  (excluding  advisory and custodial  fees) if those expenses are
actually  incurred in a different amount by the Investor Class or if it receives
different services.

     The  Adviser  may  assume  expenses  of the Fund from time to time.  To the
extent any service  providers  assume  expenses of the Fund,  such assumption of
expenses will have the effect of lowering the Fund's  overall  expense ratio and
increasing its yield to investors.

DISTRIBUTION OF SHARES
- --------------------------------------------------------------------------------
     The Board of  Directors  of RBB has  approved  and  adopted a  Distribution
Agreement and Plan of Distribution  for the Shares (the "Plan") pursuant to Rule
12b-1 under the 1940 Act. Under the Plan, the Distributor is entitled to receive
from the Fund a  distribution  fee with respect to the Shares,  which is accrued
daily and paid  monthly,  of up to 0.25% on an  annualized  basis of the average
daily net assets of the Shares. The actual amount of such compensation under the

                                       9
<PAGE>

Plan is agreed  upon by RBB's Board of  Directors  and by the  Distributor.  The
Distributor may, in its discretion,  from time to time waive  voluntarily all or
any portion of its distribution  fee. The Distributor  intends to waive all fees
under the Plan during the current fiscal year.

     Amounts  paid  to  the  Distributor  under  the  Plan  may be  used  by the
Distributor  to cover  expenses  that are related to (i) the sale of the Shares,
(ii) ongoing servicing and/or  maintenance of the accounts of Shareholders,  and
(iii)  sub-transfer  agency services,  subaccounting  services or administrative
services related to the sale of the Shares, all as set forth in the Fund's 12b-1
Plan.  The  Distributor  may delegate some or all of these  functions to Service
Agents. See "How to Purchase Shares - Purchases Through Intermediaries."

     The Plan obligates the Fund,  during the period it is in effect,  to accrue
and pay to the  Distributor  on behalf of the Shares the fee agreed to under the
Distribution  Agreement.  Payments  under the Plan are not tied  exclusively  to
expenses  actually  incurred by the  Distributor,  and the  payments  may exceed
distribution expenses actually incurred.

PURCHASES THROUGH INTERMEDIARIES

     Shares  of the Fund  may be  available  through  certain  brokerage  firms,
financial institutions and other industry professionals (collectively,  "Service
Organizations").  Certain  features  of the  Shares,  such  as the  initial  and
subsequent investment minimums and certain trading restrictions, may be modified
or waived by Service Organizations. Service Organizations may impose transaction
or administrative charges or other direct fees, which charges and fees would not
be imposed if Shares are purchased directly from the Fund.  Therefore,  a client
or  customer  should  contact  the  Service  Organization  acting on his  behalf
concerning the fees (if any) charged in connection with a purchase or redemption
of Shares and should read this  Prospectus  in light of the terms  governing his
accounts  with  the  Service   Organization.   Service   Organizations  will  be
responsible for promptly transmitting client or customer purchase and redemption
orders to the Fund in accordance  with their  agreements  with the Fund and with
clients or customers.  Service Organizations or, if applicable,  their designees
that have entered into agreements with the Fund or its agent may enter confirmed
purchase  orders on behalf of clients and  customers,  with payment to follow no
later than the Fund's  pricing on the following  Business Day. If payment is not
received  by such  time,  the  Service  Organization  could be held  liable  for
resulting fees or losses. The Fund will be deemed to have received a purchase or
redemption order when a Service Organization,  or, if applicable, its authorized
designee,  accepts a purchase or redemption order in good order. Orders received
by the Fund in good  order  will be priced at the  Fund's  net asset  value next
computed after they are accepted by the Service  Organization  or its authorized
designee.

     For administration,  subaccounting,  transfer agency and/or other services,
Boston   Partners,   the  Distributor  or  their   affiliates  may  pay  Service
Organizations and certain  recordkeeping  organizations a fee of up to .35% (the
"Service Fee") of the average annual value of accounts with the Fund  maintained
by such Service  Organizations or recordkeepers.  The Service Fee payable to any
one Service Organization is determined based upon a number of factors, including
the  nature  and  quality  of  services  provided,   the  operations  processing
requirements  of the  relationship  and the  standardized  fee  schedule  of the
Service Organization or recordkeeper.

     The Adviser,  the  Distributor or either of their  affiliates may, at their
own expense, provide promotional incentives for qualified recipients who support
the sale of Shares,  consisting  of  securities  dealers who have sold Shares or
others,  including  banks  and  other  financial  institutions,   under  special
arrangements.  Incentives may include opportunities to attend business meetings,
conferences, sales or training programs for recipients, employees or clients and
other  programs or events and may also include  opportunities  to participate in
advertising  or  sales  campaigns  and/or  shareholder   services  and  programs
regarding one or more Boston Partners Funds.  Travel, meals and lodging may also
be paid in connection  with these  promotional  activities.  In some  instances,
these   incentives   may  be  offered   only  to  certain   institutions   whose
representatives provide services in connection with the sale or expected sale of
significant amounts of Shares.

                                       10
<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>

<TABLE>
<CAPTION>
         BOSTON PARTNERS MICRO CAP VALUE FUND                 bp
                  (INVESTOR CLASS)                            BOSTON PARTNERS ASSET MANAGEMENT, L.P.
                                                              --------------------------------------

<S>               <C>                                <C>                        <C>
ACCOUNT APPLICATION
PLEASE NOTE: Do not use this form to open a retirement plan account. For an IRA application or help with this Application,
please call 1-888-261-4073.

+--------------+  (Please check the appropriate box(es) below.)
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| Registration:|           Name                                                 SOCIAL SECURITY NUMBER OR TAX ID # OF PRIMARY OWNER
+--------------+
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                           ________________________________________________________________________________________________________
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                           MINOR'S SOCIAL SECURITY NUMBER AND DATE OF BIRTH

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OR OTHER ENTITY:
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+--------------+           ________________________________________________________________________________________________________
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+--------------+           CITY                                                                  STATE            ZIP CODE

                           ________________________________________________________________________________________________________
                           DAY PHONE NUMBER                                                                 EVENING PHONE NUMBER


+--------------+   Minimum initial investment of $2,500.                            Amount of investment $____________
| 3            |
| Investment   |   Make the check payable to Boston Partners Micro Cap Value Fund.
| Information: |
+--------------+   Shareholders may not purchase shares of this Fund with a check issued by a third party and endorsed over to
                   the Fund.

- ------------
DISTRIBUTION       NOTE:  Dividends and capital gains may be reinvested or paid by check.  If no options are selected
OPTIONS:           below, both dividends and capital gains will be reinvested in additional Fund shares.
- ------------
                   DIVIDENDS: Pay by check |_| Reinvest |_|   CAPITAL GAINS: Pay by check |_| Reinvest |_|


+--------------+   To use this option, you must initial the appropriate line below.
| 4            |   I authorize the Transfer Agent to accept instructions from any persons to redeem or exchange shares in
| Telephone    |   my account(s) by telephone in accordance with the procedures and conditions set forth in the Fund's
| Redemption:  |   current prospectus.
+--------------+
</TABLE>

<PAGE>


<TABLE>
<S>                <C>                                <C>                              <C>

                                                                                       Redeem shares, and send the proceeds to the
                   ____________________________       ________________________________ address of record.
                   individual initial                               joint initial      


                                                                                       
                   ____________________________       ________________________________ Exchange shares for shares of The Boston
                   individual initial                               joint initial      Partners Large Cap Value Fund, Mid Cap 
                                                                                       Value Fund, Bond Fund or Market Neutral Fund.

+--------------+   The Automatic Investment Plan which is available to shareholders of the Fund, makes possible regularly
| 5            |   scheduled purchases of Fund shares to allow dollar-cost averaging. The Fund's Transfer Agent can
| Automatic    |   arrange for an amount of money selected by you to be deducted from your checking account and used to
| Investment   |   purchase shares of the Fund.
| Plan:        |
+--------------+   Please debit $________ from my checking account (named below) on or about the 20th of the month. PLEASE ATTACH AN
                           UNSIGNED, VOIDED CHECK.
                           |_|  Monthly     |_|  Every Alternate Month |_|  Quarterly   |_|  Other

_______________            ________________________________________________________________________________________________________
BANK OF RECORD:            BANK NAME                                                              STREET ADDRESS OR P.O. BOX
_______________
                           ________________________________________________________________________________________________________
                           CITY                                        STATE                                        ZIP CODE

                           ________________________________________________________________________________________________________
                           BANK ABA NUMBER                                                               BANK ACCOUNT NUMBER


+--------------+   The undersigned warrants that I (we) have full authority and, if a natural person, I (we) am (are) of
| 6            |   legal age to purchase shares pursuant to this Account Application, and I (we) have received a current
|              |   prospectus for the Fund in which I (we) am (are) investing.
| Signatures:  |   Under the Interest and Dividend Tax Compliance Act of 1983, the Fund is required to have the following
+--------------+   certification:

                           Under penalties of perjury, I certify that:
                           (1) The number shown on this form is my correct taxpayer identification number (or I am waiting for a
                               number to be issued to), and

                           (2) I am not subject to backup withholding because (a) I am exempt from backup withholding, or (b) I have
                           not been notified by the Internal Revenue Service that I am subject to 31% backup withholding as a result
                           of a failure to report all interest or dividends, or (c) the IRS has notified me that I am no longer
                           subject to backup withholding.

                           NOTE: YOU MUST CROSS OUT ITEM (2) ABOVE IF YOU HAVE BEEN NOTIFIED BY THE IRS THAT YOU ARE CURRENTLY
                           SUBJECT TO BACKUP WITHHOLDING BECAUSE YOU HAVE FAILED TO REPORT ALL INTEREST AND DIVIDENDS ON YOUR TAX
                           RETURN. THE INTERNAL REVENUE SERVICE DOES NOT REQUIRE YOUR CONSENT TO ANY PROVISION OF THIS DOCUMENT
                           OTHER THAN THE CERTIFICATION REQUIRED TO AUDIT BACKUP WITHHOLDING.


                           ________________________________________________________________________________________________________
                           SIGNATURE OF APPLICANT                                                               DATE


                           ________________________________________________________________________________________________________
                           PRINT NAME                                                                     TITLE (IF APPLICABLE)


                           ________________________________________________________________________________________________________
                           SIGNATURE OF JOINT OWNER                                                             DATE


                           ________________________________________________________________________________________________________
                           PRINT NAME                                                                     TITLE (IF APPLICABLE)


                           (If you are signing for a corporation, you must indicate corporate office or title. If you wish
                           additional signatories on the account, please include a corporate resolution. If signing as a fiduciary,
                           you must indicate capacity.)

                           For information on additional options, such as IRA Applications, rollover requests for qualified
                           retirement plans, or for wire instructions, please call us at 1-888-261-4073.
</TABLE>

<PAGE>

<TABLE>
<S>                        <C>                                                  <C>

                           MAIL COMPLETED ACCOUNT APPLICATION AND CHECK TO:     THE BOSTON PARTNERS MICRO CAP VALUE FUND
                                                                                C/O PFPC INC.
                                                                                P.O. BOX 8852
                                                                                WILMINGTON, DE  19899-8852
</TABLE>
<PAGE>

                      [THIS PAGE INTENTIONALLY LEFT BLANK]

<PAGE>

HOW TO PURCHASE SHARES
- --------------------------------------------------------------------------------

GENERAL

     Shares representing interests in the Fund are offered continuously for sale
by the  Distributor and may be purchased  without  imposition of a sales charge.
Shares may be purchased initially by completing the application included in this
Prospectus and forwarding the application to the Fund's  transfer  agent,  PFPC.
Purchases  of Shares may be  effected by wire to an account to be  specified  by
PFPC or by mailing a check or  Federal  Reserve  Draft,  payable to the order of
"The  Boston  Partners  Micro Cap Value  Fund,"  c/o PFPC Inc.,  P.O.  Box 8852,
Wilmington, Delaware 19899-8852. The name of the Fund, Boston Partners Micro Cap
Value Fund, must also appear on the check or Federal Reserve Draft. Shareholders
may not purchase shares of the Boston Partners Micro Cap Value Fund with a check
issued by a third party and endorsed over to the Fund.  Federal  Reserve  Drafts
are  available  at  national  banks or any state  bank  which is a member of the
Federal Reserve System.  Initial investments in the Fund must be at least $2,500
and subsequent investments must be at least $100. The Fund reserves the right to
suspend the  offering  of Shares for a period of time or to reject any  purchase
order.  As of the date of this  Prospectus,  the Fund  intends  to  suspend  the
offering of Shares upon the Fund's attaining $300 million in total assets.

     Shares may be purchased on any  Business  Day. A "Business  Day" is any day
that the New York  Stock  Exchange,  Inc.  (the  "NYSE")  is open for  business.
Currently,  the NYSE is closed on weekends and New Year's Day, Dr. Martin Luther
King, Jr. Day,  Presidents' Day, Good Friday,  Memorial Day,  Independence  Day,
Labor Day,  Thanksgiving  Day and Christmas  Day and on the preceding  Friday or
subsequent Monday when one of these holidays falls on a Saturday or Sunday.

     The price paid for Shares  purchased  initially  or  acquired  through  the
exercise of an exchange  privilege is based on the net asset value next computed
after a purchase  order is received by the Fund or its agents prior to the close
of the NYSE on such day (generally 4:00 p.m.  Eastern Time).  Orders received by
the Fund or its  agents  after the close of the NYSE are priced at the net asset
value next  determined  on the  following  Business Day. In those cases where an
investor  pays for Shares by check,  the  purchase  will be  effected at the net
asset value next determined  after the Fund or its agents receives the order and
the completed application.

     Provided  that the  investment  is at least  $2,500,  An investor  may also
purchase  Shares by having his bank or his broker wire Federal Funds to PFPC. An
investor's  bank or broker may impose a charge for this  service.  The Fund does
not currently  impose a service charge for effecting wire transfers but reserves
the  right to do so in the  future.  In order to  ensure  prompt  receipt  of an
investor's Federal Funds wire for an initial investment, it is important that an
investor follows these steps:

     A. Telephone the Fund's transfer agent, PFPC, toll-free (888) 261-4073, and
provide PFPC with your name, address,  telephone number,  Social Security or Tax
Identification  Number, the Fund selected,  the amount being wired, and by which
bank. PFPC will then provide an investor with a Fund account  number.  Investors
with existing accounts should also notify PFPC prior to wiring funds.

                                       11
<PAGE>

     B. Instruct your bank or broker to wire the specified amount, together with
your assigned account number, to PFPC's account with PNC Bank:

     PNC Bank, N.A. Philadelphia, PA 19103
     ABA NUMBER: 0310-0005-3
     CREDITING ACCOUNT NUMBER: 86-1108-2507
     FROM: (name of investor)
     ACCOUNT NUMBER: (Investor's account number with the Fund)
     FOR PURCHASE OF: Boston Partners Micro Cap Value Fund
     AMOUNT: (amount to be invested)

     C. Fully complete and sign the application and mail it to the address shown
thereon. PFPC will not process purchases until it receives a fully completed and
signed application.

     For subsequent investments, an investor should follow steps A and B above.

AUTOMATIC INVESTING

     Additional  investments in Shares may be made  automatically by authorizing
the Fund's  transfer agent to withdraw  funds from your bank account.  Investors
desiring to  participate  in the  automatic  Investing  Program  should call the
Fund's transfer agent, PFPC, at (888) 261-4073 to obtain the appropriate forms.

RETIREMENT PLANS

     Shares may be purchased in conjunction with individual  retirement accounts
("IRAs")  and rollover  IRAs where PFPC Trust  Company  acts as  custodian.  For
further  information  as to  applications  and annual  fees,  contact the Fund's
transfer agent, PFPC, at (888) 261-4073. To determine whether the benefits of an
IRA are available and/or  appropriate,  a shareholder  should consult with a tax
adviser.

HOW TO REDEEM AND EXCHANGE SHARES
- --------------------------------------------------------------------------------

REDEMPTION BY MAIL

     Shareholders may redeem for cash some or all of their Shares of the Fund at
any time.  To do so, a written  request in proper form must be sent  directly to
Boston Partners Micro Cap Value Fund, c/o PFPC Inc., P.O. Box 8852,  Wilmington,
Delaware 19899-8852. There is no charge for a redemption, unless the Shareholder
has held his or her Shares for less than one year,  upon which a fee equal to 1%
of the net asset value of the Shares  redeemed at the time of redemption will be
imposed.

     A request for  redemption  must be signed by all persons in whose names the
Shares  are   registered.   Signatures  must  conform  exactly  to  the  account
registration.  If the proceeds of the redemption would exceed $10,000, or if the
proceeds are not to be paid to the record owner at the record address, or if the
shareholder is a corporation, partnership, trust or fiduciary, signature(s) must
be  guaranteed  according  to the  procedures  described  below under  "Exchange
Privilege."

     Generally,  a properly signed written  request with any required  signature
guarantee  is all that is required  for a  redemption.  In some cases,  however,
other  documents may be  necessary.  In the case of  shareholders  holding share
certificates,  the certificates for the shares being redeemed must accompany the
redemption  request.  Additional  documentary  evidence  of  authority  is  also
required by the Fund's transfer agent in the event  redemption is requested by a
corporation, partnership, trust, fiduciary, executor or administrator.

                                       12
<PAGE>

SYSTEMATIC WITHDRAWAL PLAN

     If your  account  has a value  of at least  $10,000,  you may  establish  a
Systematic  Withdrawal Plan and receive regular periodic payments.  A request to
establish a Systematic  Withdrawal  Plan must be submitted in writing to PFPC at
P.O. Box 8852, Wilmington,  Delaware 19899-8852. Each withdrawal redemption will
be  processed  on or about the 25th of the month and mailed as soon as  possible
thereafter.  There are no service  charges for  maintenance;  the minimum amount
that you may withdraw  each period is $100.  (This is merely the minimum  amount
allowed and should not be mistaken  for a  recommended  amount.) The holder of a
Systematic  Withdrawal Plan will have any income dividends and any capital gains
distributions  reinvested in full and fractional  shares at net asset value.  To
provide  funds  for  payment,  Shares  will be  redeemed  in such  amount  as is
necessary  at the  redemption  price,  which is net asset value next  determined
after the  Fund's  receipt of a  redemption  request.  Redemption  of Shares may
reduce or possibly exhaust the Shares in your account, particularly in the event
of a  market  decline.  As  with  other  redemptions,  a  redemption  to  make a
withdrawal  payment is a sale for federal  income tax  purposes.  Payments  made
pursuant to a Systematic Withdrawal Plan cannot be considered as actual yield or
income since part of such payments may be a return of capital.

     You will ordinarily not be allowed to make  additional  investments of less
than the aggregate  annual  withdrawals  under the  Systematic  Withdrawal  Plan
during the time you have the plan in effect and,  while a Systematic  Withdrawal
Plan is in effect,  you may not make  periodic  investments  under the Automatic
Investment Plan. You will receive a confirmation of each transaction showing the
sources of the payment and the Share and cash  balance  remaining  in your plan.
The plan may be terminated on written  notice by the  shareholder or by the Fund
and will terminate  automatically if all Shares are liquidated or withdrawn from
the account or upon the death or incapacity of the  shareholder.  You may change
the amount and  schedule  of  withdrawal  payments or suspend  such  payments by
giving written notice to the Fund's  transfer agent at least seven Business Days
prior to the end of the month preceding a scheduled payment.

TRANSACTION FEE IMPOSED ON CERTAIN REDEMPTIONS

     The Fund requires the payment of a transaction fee on redemptions of Shares
of the Fund held for less than one year equal to 1.00% of the net asset value of
such Shares redeemed at the time of redemption.  This additional transaction fee
is paid to the Fund, not to the adviser,  distributor or transfer  agent.  It is
not a sales charge or a contingent  deferred  sales  charge.  The purpose of the
additional   transaction  fee  is  to  indirectly  allocate   transaction  costs
associated with redemptions to those investors making  redemptions after holding
their shares for a short period,  thus protecting existing  shareholders.  These
costs  include:  (1)  brokerage  costs;  (2) market  impact  costs -- i.e.,  the
decrease  in  market  prices  which  may  result  when  the Fund  sells  certain
securities  in order  to raise  cash to meet  the  redemption  request;  (3) the
realization of capital gains by the other  shareholders in the Fund; and (4) the
effect of the "bid-ask" spread in the over-the-counter  market. The 1.00% amount
represents  the Fund's  estimate of the  brokerage and other  transaction  costs
which may be incurred by the Fund in  disposing  of stocks in which the Fund may
invest.  Without the  additional  transaction  fee, the Fund would  generally be
selling  its shares at a price less than the cost to the Fund of  acquiring  the
portfolio  securities  necessary  to maintain  its  investment  characteristics,
resulting in reduced  investment  performance for all  shareholders in the Fund.
With the additional transaction fee, the transaction costs of selling additional
stocks are not borne by all existing  shareholders,  but the source of funds for
these costs is the transaction fee paid by those investors making redemptions.

INVOLUNTARY REDEMPTION

     The Fund reserves the right to redeem a  shareholder's  account at any time
the  net  asset  value  of the  account  falls  below  $500 as the  result  of a
redemption or an exchange request. Shareholders will be notified in writing that
the value of their account is less than $500 and will be allowed 30 days to make
additional investments before the redemption is processed.

                                       13
<PAGE>

PAYMENT OF REDEMPTION PROCEEDS

     With the  exception  of  redemptions  to which  the 1.00%  transaction  fee
applies,  the redemption  price is the net asset value per share next determined
after the request for  redemption  is received in proper form by the Fund or its
agents.  For redemptions to which the additional  transaction  fee applies,  the
redemption  price is the net asset  value per share  next  determined  after the
request  for  redemption  is  received in proper form by the Fund or its agents,
less an amount  equal to 1.00% of the net asset  value of such  shares  redeemed
that the  shareholder  has held for less  than  one  year.  Payment  for  Shares
redeemed is made by check mailed within seven days after  acceptance by the Fund
or its agents of the request and any other necessary  documents in proper order.
Such payment may be postponed or the right of redemption  suspended as permitted
by the 1940 Act. If the Shares to be redeemed  have been  recently  purchased by
check, the Fund's transfer agent may delay mailing a redemption check, which may
be a period of up to 15 days from the  purchase  date,  pending a  determination
that the check has  cleared.  The Fund has  elected to be governed by Rule 18f-1
under the 1940 Act so that a portfolio is obligated to redeem its shares  solely
in cash up to the lesser of  $250,000  or 1% of its net asset  value  during any
90-day period for any one shareholder of a portfolio.

EXCHANGE PRIVILEGE

     The exchange  privilege is available to shareholders  residing in any state
in which the Shares  being  acquired  may be legally  sold.  A  shareholder  may
exchange  Shares of the Fund for Investor  Shares of any other  Boston  Partners
Fund of RBB,  subject to the  restrictions  described under "Exchange  Privilege
Limitations."  Such  exchange  will be  effected  at the net asset  value of the
exchanged  Fund  and the  net  asset  value  of the  Fund  being  acquired  next
determined after receipt of a request for an exchange by the Fund or its agents.
An exchange of Shares will be treated as a sale for federal income tax purposes.
See  "Taxes." A  shareholder  wishing to make an exchange may do so by sending a
written request to PFPC.

     If the exchanging shareholder does not currently own Investor Shares of the
Boston Partners Fund into which he would like to exchange, a new account will be
established with the same registration, dividend and capital gain options as the
account from which shares are exchanged,  unless otherwise  specified in writing
by the shareholder with all signatures guaranteed.  A signature guarantee may be
obtained from a domestic bank or trust company,  broker, dealer, clearing agency
or savings association who are participants in a medallion program recognized by
the Securities Transfer Association. The three recognized medallion programs are
Securities Transfer Agents Medallion Program (STAMP),  Stock Exchanges Medallion
Program (SEMP) and New York Stock Exchange,  Inc.  Medallion  Signature  Program
(MSP).  Signature  guarantees  that are not part of these  programs  will not be
accepted.  The exchange  privilege may be modified or terminated at any time, or
from time to time, by RBB, upon 60 days' written notice to shareholders.

     If an exchange is to a new account in the acquired  Fund,  the dollar value
of Investor  Shares  acquired must equal or exceed that Fund's minimum for a new
account;  if to an existing account,  the dollar value must equal or exceed that
Fund's  minimum for  subsequent  investments.  If any amount remains in the Fund
from which the  exchange  is being  made,  such  amount  must not drop below the
minimum account value required by the Fund.

EXCHANGE PRIVILEGE LIMITATIONS

     The Fund's exchange privilege is not intended to afford  shareholders a way
to speculate on  short-term  movements in the market.  Accordingly,  in order to
prevent excessive use of the exchange privilege that may potentially disrupt the
management of the Fund and increase  transaction costs, the Fund has established
a policy of limiting excessive exchange activity.

     Shareholders are entitled to six (6) exchange redemptions (at least 30 days
apart)  from the Fund  during any  twelve-month  period.  Notwithstanding  these
limitations,  the  Fund  reserves  the  right to  reject  any  purchase  request
(including  purchases by exchange)  that is deemed to be disruptive to efficient
portfolio management.

                                       14
<PAGE>

TELEPHONE TRANSACTIONS

     In order to request a telephone exchange or redemption,  a shareholder must
have  completed  and  returned  an account  application  containing  a telephone
election.  To add a telephone  option to an existing account that previously did
not provide for this option, a Telephone  Authorization  Form must be filed with
PFPC.  This form is available  from PFPC.  Once this election has been made, the
shareholder  may simply  contact  PFPC by  telephone  to request the exchange or
redemption by calling (888)  261-4073.  Neither RBB, the Fund, the  Distributor,
the  Administrator  nor any  other  Fund  agent  will be  liable  for any  loss,
liability,  cost or expense for following RBB's telephone transaction procedures
described  below or for following  instructions  communicated  by telephone that
they reasonably believe to be genuine.

     RBB's telephone transaction  procedures include the following measures: (1)
requiring the appropriate  telephone  transaction privilege forms; (2) requiring
the  caller to provide  the names of the  account  owners,  the  account  social
security number and name of the Fund, all of which must match RBB's records; (3)
requiring RBB's service representative to complete a telephone transaction form,
listing  all of the above  caller  identification  information;  (4)  permitting
exchanges only if the two account  registrations  are  identical;  (5) requiring
that  redemption  proceeds be sent only by check to the account owners of record
at the  address of  record,  or by wire only to the owners of record at the bank
account  of  record;  (6)  sending a  written  confirmation  for each  telephone
transaction  to the owners of record at the  address of record  within  five (5)
Business Days of the call; and (7) maintaining  tapes of telephone  transactions
for six months, if the Fund elects to record shareholder telephone transactions.
For  accounts  held of record by  broker-dealers  (other than the  Distributor),
financial  institutions,   securities  dealers,  financial  planners  and  other
industry  professionals,  additional  documentation or information regarding the
scope of a caller's authority is required.  Finally, for telephone  transactions
in accounts held jointly, additional information regarding other account holders
is required. Telephone transactions will not be permitted in connection with IRA
or other  retirement  plan accounts or by an  attorney-in-fact  under a power of
attorney.

NET ASSET VALUE
- --------------------------------------------------------------------------------
     The net asset values for each class of a fund are  calculated by adding the
value of the  proportionate  interest of the class in a fund's cash,  securities
and other  assets,  deducting  actual and accrued  liabilities  of the class and
dividing the result by the number of  outstanding  shares of the class.  The net
asset value of each class is calculated  independently  of each other class. The
net asset values are calculated as of the close of regular  trading on the NYSE,
generally 4:00 p.m. Eastern Time on each Business Day.

     Valuation of securities held by the Fund is as follows:  securities  traded
on a national  securities  exchange or on the NASDAQ  National Market System are
valued at the last reported sale price that day; securities traded on a national
securities exchange or on the NASDAQ National Market System for which there were
no sales on that day and securities traded on other over-the-counter markets for
which market  quotations are readily available are valued at the mean of the bid
and asked prices;  and  securities  for which market  quotations are not readily
available  are valued at fair  market  value as  determined  in good faith by or
under the  direction of RBB's Board of Directors.  The amortized  cost method of
valuation may also be used with respect to debt  obligations  with sixty days or
less remaining to maturity.

     With the approval of RBB's Board of  Directors,  the Fund may use a pricing
service,  bank or broker-dealer  experienced in such matters to value the Fund's
securities. A more detailed discussion of net asset value and security valuation
is contained in the Statement of Additional Information.

                                       15
<PAGE>

DIVIDENDS AND DISTRIBUTIONS
- --------------------------------------------------------------------------------
     The Fund will distribute substantially all of the net investment income and
net realized capital gains, if any, of the Fund to the Fund's shareholders.  All
distributions  are  reinvested  in the form of  additional  full and  fractional
Shares unless a shareholder elects otherwise.

     The Fund will declare and pay dividends from net investment income annually
and will pay them in the calendar year in which they are declared,  generally in
December.  Net realized capital gains (including net short-term  capital gains),
if any, will be distributed at least annually.

TAXES
- --------------------------------------------------------------------------------
     The  following  discussion is only a brief summary of some of the important
tax considerations  generally affecting the Fund and its shareholders and is not
intended as a substitute for careful tax planning. Accordingly, investors in the
Fund should consult their tax advisers with specific  reference to their own tax
situation.

     The Fund will elect to be taxed as a  regulated  investment  company  under
Subchapter M of the Internal  Revenue Code of 1986,  as amended.  So long as the
Fund qualifies for this tax treatment, it will be relieved of federal income tax
on amounts  distributed to  shareholders,  but  shareholders,  unless  otherwise
exempt, will pay income or capital gains taxes on amounts so distributed (except
distributions  that are  treated as a return of capital)  regardless  of whether
such distributions are paid in cash or reinvested in additional shares.

     Distributions  out of the "net capital  gain" (the excess of net  long-term
capital gain over net  short-term  capital loss),  if any, of the Fund,  will be
taxed to shareholders as long-term capital gain regardless of the length of time
a shareholder has held his Shares,  whether such gain was reflected in the price
paid for the Shares,  or whether  such gain was  attributable  to bonds  bearing
tax-exempt interest.  All other  distributions,  to the extent they are taxable,
are taxed to shareholders as ordinary income.

     RBB will send written  notices to shareholders  annually  regarding the tax
status of distributions made by the Fund.  Dividends declared in December of any
year payable to  shareholders of record on a specified date in such a month will
be deemed to have been  received by the  shareholders  on December 31,  provided
such dividends are paid during  January of the following  year. The Fund intends
to make  sufficient  actual  or  deemed  distributions  prior to the end of each
calendar year to avoid liability for federal excise tax.

     Investors  should be careful to  consider  the tax  implications  of buying
shares just prior to a distribution.  The price of shares purchased at that time
will  reflect  the  amount  of the  forthcoming  distribution.  Those  investors
purchasing shares just prior to a distribution will nevertheless be taxed on the
entire amount of the  distribution  received,  although the  distribution is, in
effect, a return of capital.

     Shareholders  who exchange  shares  representing  interests in one Fund for
shares  representing  interests in another Fund will generally recognize capital
gain or loss for federal income tax purposes.

     Shareholders  who are  nonresident  alien  individuals,  foreign  trusts or
estates,  foreign  corporations  or  foreign  partnerships  may  be  subject  to
different  U.S.  Federal  income  tax  treatment  and should  consult  their tax
advisers.

MULTI-CLASS STRUCTURE
- --------------------------------------------------------------------------------
     The Fund offers one other class of shares,  Institutional  Shares, which is
offered directly to institutional  investors pursuant to a separate  prospectus.
Shares of each class  represent  equal pro rata interests in the Fund and accrue
dividends and calculate net asset value and  performance  quotations in the same
manner. The Fund will quote performance

                                       16
<PAGE>

of  the  Institutional  Shares  separately  from  Investor  Shares.  Because  of
different  expenses paid by the Investor Shares, the total return on such shares
can be  expected,  at any  time,  to be  different  than  the  total  return  on
Institutional  Shares.  Information  concerning other classes may be obtained by
calling the Fund at (888) 261-4073.

DESCRIPTION OF SHARES
- --------------------------------------------------------------------------------
     RBB has authorized  capital of thirty billion shares of Common Stock, $.001
par value per share,  of which 18.326  billion  shares are currently  classified
into 97 different  classes of Common Stock.  See  "Description of Shares" in the
Statement of Additional Information."

     THIS  PROSPECTUS AND THE STATEMENT OF ADDITIONAL  INFORMATION  INCORPORATED
HEREIN  RELATE  PRIMARILY TO BOSTON  PARTNERS  MICRO CAP VALUE FUND AND DESCRIBE
ONLY THE  INVESTMENT  OBJECTIVE  AND POLICIES,  OPERATIONS,  CONTRACTS AND OTHER
MATTERS RELATING TO BOSTON PARTNERS MICRO CAP VALUE FUND.

     Each  share  that   represents  an  interest  in  the  Fund  has  an  equal
proportionate interest in the assets belonging to the Fund with each other share
that  represents  an  interest  in the Fund,  even where a share has a different
class  designation  than  another  share  representing  an interest in the Fund.
Shares of the Fund do not have preemptive or conversion rights.  When issued for
payment  as  described  in this  Prospectus,  Shares  will  be  fully  paid  and
non-assessable.

     RBB  currently  does not intend to hold  annual  meetings  of  shareholders
except  as  required  by the 1940 Act or other  applicable  law.  The law  under
certain circumstances provides shareholders with the right to call for a meeting
of shareholders to consider the removal of one or more directors.  To the extent
required by law, RBB will assist in shareholder communication in such matters.

     Holders of Shares of the Fund will vote in the  aggregate  and not by class
on all matters, except where otherwise required by law. Further, shareholders of
all investment portfolios of RBB will vote in the aggregate and not by portfolio
except as otherwise  required by law or when the Board of  Directors  determines
that the matter to be voted upon affects only the interests of the  shareholders
of  a  particular  investment  portfolio.   (See  the  Statement  of  Additional
Information under "Additional  Information  Concerning Fund Shares" for examples
when the  1940  Act  requires  voting  by  investment  portfolio  or by  class.)
Shareholders  of the Fund are  entitled  to one vote for each  full  share  held
(irrespective of class or portfolio) and fractional votes for fractional  shares
held.  Voting rights are not cumulative  and,  accordingly,  the holders of more
than 50% of the  aggregate  shares of Common  Stock of the Fund may elect all of
the directors.

     As of November 16, 1998, to the Fund's knowledge,  no person held of record
or beneficially 25% or more of the outstanding shares of all classes of RBB.

OTHER INFORMATION
- --------------------------------------------------------------------------------

REPORTS AND INQUIRIES

     Shareholders  will receive  unaudited  semi-annual  reports  describing the
Fund's  investment   operations  and  annual  financial  statements  audited  by
independent accountants. Shareholder inquiries should be addressed to PFPC Inc.,
the Fund's transfer agent, Bellevue Park Corporate Center, 400 Bellevue Parkway,
Wilmington, Delaware 19809, toll-free (888) 261-4073.

SHARE CERTIFICATES

     In  the  interest  of  economy  and  convenience,   physical   certificates
representing Shares in the Fund are not normally issued.

                                       17
<PAGE>

FUTURE PERFORMANCE INFORMATION

     From  time to time,  the  Fund may  advertise  its  performance,  including
comparisons  to other  mutual funds with similar  investment  objectives  and to
stock or other relevant indices.  All such  advertisements will show the average
annual total return over one, five and ten year periods or, if such periods have
not yet elapsed,  shorter  periods  corresponding  to the life of the Fund. Such
total  return  quotations  will be computed by finding  the  compounded  average
annual total  return for each time period that would equate the assumed  initial
investment of $1,000 to the ending redeemable value, net of fees, according to a
required standardized  calculation.  The standard calculation is required by the
SEC to provide consistency and comparability in investment company  advertising.
The Fund may also from time to time  include in such  advertising  an  aggregate
total return figure or a total return figure that is not calculated according to
the  standardized  formula  in order  to  compare  more  accurately  the  Fund's
performance with other measures of investment  return.  For example,  the Fund's
total return may be compared with data published by Lipper Analytical  Services,
Inc., CDA  Investment  Technologies,  Inc. or  Weisenberger  Investment  Company
Service,  or  with  the  performance  of the  Russell  2000  Index.  Performance
information  may also include  evaluation of the Fund by  nationally  recognized
ranking services and information as reported in financial  publications  such as
Business  Week,  Fortune,   Institutional  Investor,  Money  Magazine,   Forbes,
Barron's,  The Wall  Street  Journal,  The New York  Times,  or other  national,
regional or local publications.  All advertisements  containing performance data
will include a legend  disclosing  that such  performance  data  represents past
performance and that the investment  return and principal value of an investment
will fluctuate so that an investor's Shares, when redeemed, may be worth more or
less than their original cost.

                                       18
<PAGE>

NO  PERSON  HAS  BEEN   AUTHORIZED   TO  GIVE  ANY   INFORMATION   OR  MAKE  ANY
REPRESENTATIONS  NOT  CONTAINED  IN THIS  PROSPECTUS  OR IN RBB'S  STATEMENT  OF
ADDITIONAL INFORMATION  INCORPORATED HEREIN BY REFERENCE, IN CONNECTION WITH THE
OFFERING MADE BY THIS  PROSPECTUS  AND, IF GIVEN OR MADE,  SUCH  REPRESENTATIONS
MUST NOT BE RELIED UPON AS HAVING  BEEN  AUTHORIZED  BY RBB OR ITS  DISTRIBUTOR.
THIS  PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY RBB OR BY THE DISTRIBUTOR IN
ANY JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY BE MADE.



                              --------------------
                                TABLE OF CONTENTS
                                                                            PAGE
                                                                            ----
FINANCIAL HIGHLIGHTS ...................................................      3
INTRODUCTION ...........................................................      5
INVESTMENT OBJECTIVES AND POLICIES .....................................      5
INVESTMENT LIMITATIONS .................................................      6
RISK FACTORS ...........................................................      7
YEAR 2000 ..............................................................      8
MANAGEMENT .............................................................      8
DISTRIBUTION OF SHARES .................................................      9
HOW TO PURCHASE SHARES .................................................     11
HOW TO REDEEM AND EXCHANGE SHARES. .....................................     12
NET ASSET VALUE. .......................................................     15
DIVIDENDS AND DISTRIBUTIONS. ...........................................     16
TAXES ..................................................................     16
MULTI-CLASS STRUCTURE. .................................................     16
DESCRIPTION OF SHARES. .................................................     17
OTHER INFORMATION. .....................................................     17
                                                                     
INVESTMENT ADVISER
Boston Partners Asset Management, L.P.
Boston, Massachusetts

CUSTODIAN
PFPC Trust Company
Wilmington, Delaware

TRANSFER AGENT AND ADMINISTRATOR
PFPC Inc.
Wilmington, Delaware

DISTRIBUTOR
Provident Distributors, Inc.
West Conshohocken, Pennsylvania

COUNSEL
Drinker Biddle & Reath LLP
Philadelphia, Pennsylvania

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers LLP
Philadelphia, Pennsylvania

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