MERRIMAC SERIES
485APOS, 1999-03-19
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     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MARCH 19, 1999

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                         POST-EFFECTIVE AMENDMENT NO. 3
                                       TO
                                    FORM N-1A

                        REGISTRATION STATEMENT UNDER THE
                          SECURITIES ACT OF 1933 [ X ]
                                       AND

                        REGISTRATION STATEMENT UNDER THE
                      INVESTMENT COMPANY ACT OF 1940 [ X ]

                                 AMENDMENT NO. 2

                                 MERRIMAC SERIES
               (Exact Name of Registrant as Specified in Charter)

                              200 CLARENDON STREET
                           BOSTON, MASSACHUSETTS 02116
                    (Address of Principal Executive Offices)
                                   (Zip Code)

       Registrant's Telephone Number, including Area Code: (617) 330-6413

                           Susan C. Mosher, Secretary
                         INVESTORS BANK & TRUST COMPANY
                              200 CLARENDON STREET
                           BOSTON, MASSACHUSETTS 02116
                     (Name and Address of Agent for Service)

                                    Copy to:

                               Philip Newman, Esq.
                          Goodwin, Procter & Hoar, LLP
                                 Exchange Place
                                Boston, MA 02109

Merrimac Master Portfolio also executed this Registration Statement.

Approximate date of commencement of proposed sale to the public: As soon as
practical after the effective date of the Registration Statement. 

It is proposed that this filing will become effective (check appropriate box) 

[ ]     immediately upon filing pursuant to paragraph (b)
[ ]     on (date) pursuant to paragraph (b)
[ ]     60 days after filing pursuant to paragraph (a)(1)
[ ]     on (date) pursuant to paragraph (a)(1)
[X]     75 days after filing pursuant to paragraph (a)(2)
[ ]     on (date) pursuant to paragraph (a)(2) of rule 485.

To:  The Securities and Exchange Commission

The Registrant submits this Post-Effective Amendment No. 3 to its Registration
Statement under the Securities Act of 1933 (Registration No. 333-49693) and
this Amendment No. 2 to its Registration Statement under the Investment Company
Act of 1940 (Registration No. 811-08741).  This Post-Effective Amendment
relates solely to the Merrimac U.S. Government Series.  No information relating
to any other series of the Registrant is amended or superseded hereby.

<PAGE>

                MERRIMAC SERIES
                


                                                                PROSPECTUS
                                                               JUNE __, 1999





        MERRIMAC U.S. GOVERNMENT SERIES

    The Fund offers three classes of shares:
Premium Class, Institutional Class and Investment Class


































                
The  Securities and Exchange  Commission has not approved or disapproved  these
securities or determined if this prospectus is truthful or complete. Anyone who
tells you otherwise is committing a crime.

                                       1

<PAGE>

<TABLE>
<CAPTION>

<S>                                    <C>   <C>                          <C>

                                       CONTENTS

                                       THE FUND

WHAT EVERY INVESTOR                          RISK/RETURN SUMMARY           3
SHOULD KNOW ABOUT                            THE FUND'S INVESTMENTS        6
THE FUND                                     THE FUND'S MANAGEMENT         7



INFORMATION FOR                        YOUR INVESTMENT
MANAGING YOUR
FUND ACCOUNT
                                             SHAREHOLDER INFORMATION
                                             Purchases                     7
                                             Redemptions                   8
                                             Valuation of Shares           9
                                             Dividends and Distributions  10
                                             Federal Taxes                10


APPENDIX A                             DESCRIPTION OF SECURITIES IN WHICH
                                       THE PORTFOLIO CAN INVEST


WHERE TO FIND MORE INFORMATION
ABOUT MERRIMAC SERIES                  FOR MORE INFORMATION

                                             BACK COVER

</TABLE>
                                       2

<PAGE>

                              RISK/RETURN SUMMARY

The following  information is only a summary of important  information that you
should know about  Merrimac  U.S.  Government  Series  (the Fund),  a series of
Merrimac Series (the Trust). More detailed information is included elsewhere in
this Prospectus and in the Statement of Additional Information (SAI) and should
be read in  addition  to this  summary.  As with any mutual  fund,  there is no
guarantee that the Fund will achieve its goal.

Traditional  mutual  funds  directly  acquire  and manage  their own  portfolio
securities.  The Fund is organized in a "master-feeder"  structure, under which
it invests all of its assets in the Merrimac  U.S.  Government  Portfolio  (the
Portfolio),  a corresponding  series of Merrimac  Master  Portfolio (the Master
Portfolio).  The Fund and its  corresponding  Portfolio have  substantially the
same investment objective and investment policies.

WHAT IS THE FUND'S INVESTMENT OBJECTIVE AND MAIN STRATEGY?

The Fund's  investment  objective is to achieve a high level of current  income
consistent with preserving principal and liquidity. Allmerica Asset Management,
Inc.  (AAM),  the subadviser of the  Portfolio,  attempts to achieve the Fund's
objective  by  investing  the  Portfolio's   assets  in  securities  issued  or
guaranteed as to principal and interest by the U.S.  Government or its agencies
or  instrumentalities.  The Portfolio also may invest in repurchase  agreements
that are collateralized by these instruments.

In view of the risks inherent in all  investments  in  securities,  there is no
assurance  that  the  Fund's  objective  will  be  achieved.   See  THE  FUND'S
INVESTMENTS for more information.

MAIN RISK OF INVESTING IN THE FUND

The primary risk in investing in the Fund is interest rate risk.

O INTEREST  RATE risk  involves  the  possibility  that the value of the Fund's
  investments will decline due to an increase in interest rates.

Money market funds can be confused  with  savings  accounts.  The Fund is not a
savings account but, rather, a money market mutual fund that issues and redeems
at the  Fund's  per share net  asset  value  (NAV).  The Fund  always  seeks to
maintain a constant NAV of $1.00 per share.

Unlike a savings account,  however,  an investment in the Fund is not a deposit
of Investors  Bank & Trust  Company,  or any other bank,  and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency.  Although  the Fund seeks to preserve the value of your  investment  at
$1.00 per share, it is possible to lose money by investing in the Fund.

                                       3

<PAGE>

IS THE FUND FOR YOU?

The Fund may be appropriate as part of your investment portfolio if......

O  You need to preserve principal.
O  You want a short-term, low-risk investment.

The Fund may not be appropriate as part of your investment portfolio if......

O  You need a high total return to achieve your goals.
O  You seek long-term growth as your primary goal.

COULD THE VALUE OF YOUR INVESTMENT IN THE FUND FLUCTUATE?

Yes, it could.  The Fund is managed in accordance  with strict  Securities  and
Exchange  Commission  guidelines designed to preserve the Fund's value at $1.00
per share, although, of course, there cannot be a guarantee that the value will
remain at $1.00 per share.  The value of your  investment  typically  will grow
through reinvested dividends.

TOTAL RETURN

The  Fund is newly  operational  and  therefore  does  not  have  total  return
information for the period ended December 31, 1998. For the Fund's most current
yield information you may call 1-888-MERRMAC.

Performance  information should be considered in light of the Fund's investment
objective and policies and market conditions.  Historical  performance does not
necessarily indicate what will happen in the future.

FEES AND EXPENSES

This summary  shows what it will cost you directly or  indirectly  to invest in
the Fund.

SHAREHOLDER TRANSACTION EXPENSES - FEES YOU PAY DIRECTLY FROM YOUR INVESTMENT

There are no fees or sales loads  charged to your  account when you buy or sell
Fund  shares.  However,  if you sell  shares  and  request  your  money by wire
transfer your bank may charge you a fee.

ANNUAL FUND OPERATING EXPENSES - EXPENSES THAT ARE DEDUCTED FROM FUND ASSETS 

Fund  expenses are  reflected in the Fund's share price and  dividends.  "Other
Expenses" include expenses such as legal, accounting and printing services. The
figures  below show  estimated  expenses for the current  fiscal year,  and are
calculated as a percentage of estimated average net assets.

                                       4

<PAGE>

<TABLE>
<CAPTION>

<S>                                     <C>         <C>             <C>

                                        Premium     Institutional   Investment
                                        Class       Class           Class

- -------------------------------------------------------------------------------
Management Fees                         0.17%        0.17%            0.17%
- -------------------------------------------------------------------------------
Distribution (12b-1) Fees               None         None             0.25%
- -------------------------------------------------------------------------------
Shareholder Servicing Fees              None         0.25%            0.25%
- -------------------------------------------------------------------------------
Other Expenses                          0.13%        0.13%            0.13%
                                        ----         ----             ----
- -------------------------------------------------------------------------------
Total Annual Fund Operating Expenses(1) 0.30%        0.55%            0.80%
                                        ----         ----             ----
                                        ----         ----             ----
- -------------------------------------------------------------------------------
        
     (1) This table and the  Example  below  reflect  the Fund's own  estimated
     expenses and the Fund's share of the Portfolio's expenses.

</TABLE>

EXAMPLE

This  example is intended to help you compare the cost of investing in the Fund
with the cost of investing in other mutual funds.

The Example  assumes  that you invest  $10,000 in the Fund for the time periods
indicated and then redeem all of your shares at the end of those  periods.  The
Example also assumes  that your  investment  has a 5% return each year and that
the Fund's operating  expenses remain the same.  Although your actual costs may
be higher or lower, based on these assumptions your costs would be:

<TABLE>
<CAPTION>

<S>                                     <C>            <C>

                                        ONE YEAR       THREE YEARS
                                        --------       -----------

PREMIUM CLASS                             $31              $97
INSTITUTIONAL CLASS                        56              176
INVESTMENT CLASS                           82              255

</TABLE>

                                       5

<PAGE>

                            THE FUND'S INVESTMENTS

Principal Investment Strategies and Risks


Q  What is the Fund's principal investment strategy?

A  The Fund's  principal  investment  strategy is to invest the Fund's share of
   the  Portfolio's  assets in securities  issued or guaranteed as to principal
   and interest by the U.S. Government or its agencies or instrumentalities.

Q  Into  what  types of money  market  instruments  will the  Fund's  assets be
   invested?

A  The Portfolio may invest in direct  obligations of the U.S. Treasury such as
   U.S. Treasury bills,  notes and bonds and in securities issued or guaranteed
   by the U.S.  Government  or its agencies.  The Portfolio  also may invest in
   repurchase agreements that are collateralized by these instruments.  Further
   description of these securities is found in Appendix A.

Q  Are there any limits on how much that can be invested in one issuer?

A  No. The  Portfolio is not limited  with  respect to purchases of  securities
   issued by the U.S. Government or its agencies.

Q  Will the Fund always maintain a net asset value of $1 per share?

A  While AAM will  endeavor  to  maintain a constant  Fund NAV of $1 per share,
   there is no  assurance  that  they  will be able to do so.  The  shares  are
   neither  insured nor  guaranteed by the U.S.  Government.  As such, the Fund
   carries some risk. There is a risk that rising interest rates will cause the
   value of the Portfolio's securities to decline. In accordance with Rule 2a-7
   under the  Investment  Company Act of 1940,  as amended  (1940 Act),  AAM is
   required to minimize  interest  rate risk by limiting  the  maturity of each
   security to 397  calendar  days or less and  maintaining  a  dollar-weighted
   average portfolio maturity for the Portfolio of 90 days or less.

Q  How are the decisions to buy or sell securities made?

A  Factors are balanced such as the Portfolio's objective of maximizing current
   income while  maintaining  safety and liquidity.  AAM utilizes a two-pronged
   investment approach to the Portfolio. The first is a fundamental view of the
   economic  environment,  coupled  with  a  technical  analysis  of  the  U.S.
   Government and repurchase agreement markets.








                                       6

<PAGE>

                             THE FUND'S MANAGEMENT

INVESTMENT ADVISER

The Fund has not  retained the services of an  investment  adviser  because the
Fund invests all of its investable assets in its corresponding  Portfolio.  The
Portfolio  has  retained  the  services  of  Investors  Bank  &  Trust  Company
(Investors Bank) as investment adviser. Investors Bank continuously reviews and
supervises the Portfolio's  investment  program.  Investors Bank discharges its
responsibilities subject to the supervision of, and policies established by the
Board of Trustees.  Investors Bank's business address is 200 Clarendon  Street,
Boston,  Massachusetts  02116.  Investors  Bank began  acting as an  investment
adviser on November 21, 1996.  The Portfolio  pays Investors Bank a unitary fee
for servicing the Portfolio as Investment  Adviser,  Administrator,  Custodian,
Fund  Accountant and Transfer  Agent.  The fee is computed at an annual rate of
0.17% of average net assets of the Portfolio.

INVESTMENT SUB-ADVISER

Allmerica Asset Management,  Inc. (AAM) serves as investment sub-adviser to the
Portfolio. AAM manages the Portfolio, selects investments and places all orders
for the purchase and sale of the Portfolio's securities, subject to the general
supervision of, and policies  established by the Portfolio's  Board of Trustees
and  Investors  Bank.  The  business  address  of AAM is  440  Lincoln  Street,
Worcester,  Massachusetts  01653.  AAM has been providing  investment  advisory
services  since  it  was  established  in  1993  as an  indirect,  wholly-owned
subsidiary  of  Allmerica  Financial  Corporation.  AAM  receives  a  fee  from
Investors  Bank (and not from the  Portfolio)  for its  services as  investment
sub-adviser.


                            SHAREHOLDER INFORMATION

PURCHASES

GENERAL  INFORMATION.  Shares may be purchased  only  through the  Distributor,
Funds  Distributor,  Inc.,  which  offers the Fund's  shares to the public on a
continuous  basis.  Shares of the Fund may be  purchased  only in those  states
where they may be lawfully  sold.  Shares are sold at the net asset value (NAV)
per share next computed  after the purchase  order is received in good order by
the  Distributor  and payment for shares is received  by  Investors  Bank,  the
Fund's  Custodian.  See  the  Account  Application  or call  1-888-MERRMAC  for
instructions  on how to make payment for shares to the Custodian.  Shareholders
may also make general inquiries by calling 1-888-MERRMAC.

INVESTMENT MINIMUM.  The minimum initial investment for Premium Class shares of
the Fund is $10 million.  Institutions  may satisfy the minimum  investment  by
aggregating  their  fiduciary  accounts.  The minimum  initial  investment  for
Institutional  Class  and  Investment  Class  shares  is  $10,000.   Subsequent
purchases  may be in any  amount.  The Fund  reserves  the  right to waive  the
minimum initial investment.  When a Premium Class shareholder's account balance
falls below $1 million due to redemption,  the Fund may close the account. Such
shareholders  will be notified if the minimum  balance is not being  maintained
and will be allowed 60 days to make additional  investments  before the account
is closed.

Share  purchase  orders  are  deemed  to be in good  order on the date the Fund
receives a completed Account  Application (and other documents  required by the
Trust) and federal  funds become  available  to the Fund in the Fund's  account
with Investors Bank.

                                       7

<PAGE>

Purchases may be made only by wire. Wiring instructions for purchases of shares
of the Fund are as follows:

                        Investors Bank & Trust Company
                               ABA #: 011001438
                     Attn: Merrimac U.S. Government Series
                               DDA #: 717171333
                                Name of Account
                                   Account #
                                Amount of Wire:

A bank may impose a charge to execute a wire  transfer.  A purchaser  must call
1-888-MERRMAC to inform Investors Bank of an incoming wire transfer. A purchase
order for shares  received in proper form by 4:00 p.m.  (ET) on a Business  Day
will be  executed  at the NAV per share next  determined  after  receipt of the
order,  provided that Investors Bank receives the wire by the close of business
on the day the purchase  order is received.  A Business Day is any day on which
both the NYSE and the New York Federal  Reserve Bank are open.  Purchase orders
received  after 4:00 p.m.  (ET) will be  effected on the next  Business  Day if
cleared  funds are received  before the close of business on the next  Business
Day.  Purchase orders for shares for which payment has not been received by the
close of business will not be accepted, and notice thereof will be given to the
purchaser.  The Fund may limit the amount of a purchase order received  between
3:00 p.m. (ET) and 4:00 p.m. (ET).

On days  when  the  financial  markets  close  early,  such  as the  day  after
Thanksgiving  and Christmas Eve, all purchase  orders must be received by 12:00
noon (ET).

The Fund reserves the right in its sole discretion: (i) to suspend the offering
of the Fund's shares;  (ii) to reject purchase  orders;  and (iii) to modify or
eliminate the minimum initial investment in Fund shares. Purchase orders may be
refused if, for example,  they are of a size that could  disrupt  management of
the Portfolio.

REDEMPTIONS

Shareholders  may redeem all or a portion of their shares on any Business  Day.
Shares will be redeemed at the NAV next  determined  after  Investors  Bank has
received  a proper  notice  of  redemption  as  described  below.  If notice of
redemption  is  received  prior  to 4:00  p.m.  (ET)  on a  Business  Day,  the
redemption will be effective on the date of receipt. Proceeds of the redemption
will ordinarily be made by wire on the date of receipt, but in any event within
three Business Days from the date of receipt.

Shareholder  redemption  requests  received  after 4:00 p.m. (ET) on a Business
Day, will ordinarily  receive payment by wire on the next Business Day, but, in
any  event,  within  four  Business  Days from the date of  receipt of a proper
notice of redemption. All redemption requests placed between 3:00 p.m. and 4:00
p.m. (ET) may only be placed by telephone.

The Fund reserves the right in its sole  discretion to suspend  redemptions  or
postpone payments when the NYSE is closed or when trading is restricted for any
reason or under  emergency  circumstances  as  determined  by the SEC. The Fund
reserves  the right to  postpone  payments  for  redemption  requests  received
between 3:00 p.m. and 4:00 p.m. (ET) until the next Business Day.

                                       8

<PAGE>

On days  when  the  financial  markets  close  early,  such  as the  day  after
Thanksgiving and Christmas Eve, all redemption orders must be received by 12:00
noon (ET).

A  shareholder  may elect to  receive  payment  in the form of a wire or check.
There is no charge imposed by the Fund to redeem shares;  however,  in the case
of  redemption by wire, a  shareholder's  bank may impose its own wire transfer
fee for receipt of the wire.

REDEMPTION BY WIRE. To redeem shares by wire, a shareholder  or any  authorized
agent (so designated on the Account  Application)  must provide  Investors Bank
with the dollar  amount to be  redeemed,  the  account to which the  redemption
proceeds should be wired (such account must have been previously  designated by
the  shareholder on its Account  Application),  the name of the shareholder and
the shareholder's account number.

A shareholder  may change its  authorized  agent,  the address of record or the
account  designated  to receive  redemption  proceeds at any time by writing to
Investors Bank with a signature guaranteed by a national bank which is a member
firm of any national or regional securities  exchange (a Signature  Guarantee).
If  the  guarantor  institution  belongs  to one  of  the  Medallion  Signature
Programs,  it must use the specific  Medallion  "Guaranteed"  stamp.  Notarized
signatures  are not  sufficient.  Further  documentation  may be required  when
Investors Bank deems it appropriate.

REDEMPTION BY MAIL. A  shareholder  who desires to redeem shares by mail may do
so by mailing  proper notice of redemption  directly to Investors  Bank,  ATTN:
Transfer Agency, OPS 22, P.O. Box 9130, Boston, MA 02117-9130. Proper notice of
redemption  includes  written  notice  requesting  redemption  along  with  the
signature  of all  persons in whose  names the shares  are  registered,  signed
exactly as the shares are registered. In certain instances,  Investors Bank may
require  additional  documents  such as trust  instruments or  certificates  of
corporate  authority.  Payment  will be mailed to the address of record  within
seven days of receipt of a proper notice of redemption.

TELEPHONE REDEMPTION. A shareholder may request redemption by calling Investors
Bank at  1-888-MERRMAC.  The telephone  redemption  option is made available to
shareholders  of the Fund on the Account  Application.  The Fund  reserves  the
right to refuse a telephone  request for  redemption  if it believes that it is
advisable  to do so.  Procedures  for  redeeming  shares  by  telephone  may be
modified or terminated at any time by the Fund.  Neither the Fund nor Investors
Bank will be liable for following redemption instructions received by telephone
that are reasonably  believed to be genuine,  and the shareholder will bear the
risk of loss in the event of unauthorized or fraudulent telephone instructions.
The Fund  will  employ  reasonable  procedures  to  confirm  that  instructions
communicated  by telephone  are genuine.  The Fund may be liable for any losses
due to  unauthorized  or  fraudulent  instructions  in the absence of following
these   procedures.   Such   procedures   may   include   requesting   personal
identification  information or recording  telephone  conversations.  Redemption
checks will be made payable to the  registered  shareholder(s)  and sent to the
address of record on file with  Investors  Bank.  Payments by wire will only be
made  to  the  registered   shareholder   through   pre-existing  bank  account
instructions.

No bank instruction changes will be accepted over the telephone. See REDEMPTION
BY WIRE for information on how to change bank instructions.

VALUATION OF SHARES

The Fund offers its shares at the NAV per share of the Fund, as determined once
each Business Day. This determination is made as of 4:00 p.m. (ET).  Securities
purchased by the Portfolio are stated at

                                       9

<PAGE>

amortized cost,  which  approximates  market value. For more information on how
securities are valued, see the SAI.

DIVIDENDS AND DISTRIBUTIONS

The  Fund  intends  to  declare  as a  dividend  substantially  all of its  net
investment income at the close of each Business Day and will pay such dividends
monthly.  Substantially  all of the  Fund's  distributions  will  be  from  net
investment  income.  Shareholders shall be entitled to receive dividends on the
Business Day their purchase is effected but shall not receive  dividends on the
Business Day that their  redemption is effected.  Distributions  of net capital
gains, if any, are made annually at the discretion of the officers of the Fund.
Dividends and/or capital gain distributions will be reinvested automatically in
additional  shares  of the Fund at NAV and such  shares  will be  automatically
credited to a  shareholder's  account,  unless a shareholder  elects to receive
either dividends or capital gains distributions (or both) in cash. Shareholders
may change their  distribution  option at any time by writing to Investors Bank
with a Signature  Guarantee  prior to the record  date of any such  dividend or
distribution.

FEDERAL TAXES

<TABLE>
<CAPTION>

<S>                                          <C>

- -------------------------------------------------------------------------------
            TRANSACTIONS          |          TAX STATUS
                                  |
- -------------------------------------------------------------------------------
Sales or exchanges of shares.     |  Usually capital gain or loss.  Tax rate    
                                  |  depends on how long shares are held.
                                  |
- -------------------------------------------------------------------------------
Distributions of long-term capital|  Taxable as long-term capital gain.
gain.                             |
                                  |
- -------------------------------------------------------------------------------
Distributions of short-term       |  Taxable as ordinary income.
capital gain.                     |
                                  |
- -------------------------------------------------------------------------------
Dividends from net investment     |  Taxable as ordinary income.
income.                           |
                                  |
- -------------------------------------------------------------------------------

</TABLE>


Every  January,  the Fund provides  information to its  shareholders  about the
Fund's dividends and distributions,  which are taxable even if reinvested,  and
about the  shareholders;  redemptions  during the previous  calendar  year. Any
shareholder   who  does  not   provide   the  Fund  with  a  correct   taxpayer
identification  number  and  required  certification  may be subject to federal
backup  withholding tax.  Shareholders  should generally avoid investing in the
Fund shortly before an expected taxable dividend or capital gain  distribution.
Otherwise,  a shareholder may pay taxes on dividends or distributions  that are
economically  equivalent to a partial return of the  shareholder's  investment.
Shareholders  should  consult their tax advisers about their own particular tax
situations.

CLASS EXPENSES AND DISTRIBUTION AND SHAREHOLDER SERVICING PLANS

Assets  of the  Premium  Class  shares of the Fund are not  subject  to a 12b-1
(Distribution) or shareholder  servicing fee. Assets of the Institutional Class
shares of the Fund are subject to a shareholder servicing fee of up to 0.25% of
average net assets (ANA). Assets of the Investment Class shares of the Fund are
subject to a shareholder  servicing fee and a Distribution fee each up to 0.25%
of ANA.

                                      10

<PAGE>

The  Institutional  and  Investment  Class of the Fund  offers  shares  through
certain   financial   intermediaries,   including   Investors   Bank   (Service
Organizations),  which have entered into shareholder  servicing agreements with
the Fund. Service Organizations agree to perform certain shareholder servicing,
administrative and accounting  services for their clients and customers who are
beneficial  owners  of Fund  shares.  The  Board of  Trustees  has  approved  a
Distribution  Plan with  respect to the  Investment  Class  shares of the Fund.
Under the Distribution  Plan, the  Distribution  Agent is entitled to receive a
fee (as set forth above) from the Fund with  respect to the assets  contributed
to such Fund by shareholders  who are clients or customers of the  Distribution
Agent. Because these fees are paid out of Fund assets on an ongoing basis, over
time the cost of  investing  in the Trust may cost more than paying other types
of sales charges.

MASTER/FEEDER STRUCTURE

The  Fund is a  "feeder"  fund  that  invests  exclusively  in a  corresponding
"master" portfolio with an identical investment objective. The master portfolio
may  accept  investments  from  multiple  feeder  funds,  which bear the master
portfolio's  expenses in proportion  to their assets.  

Each  feeder  fund and its  master  portfolio  expect  to  maintain  consistent
investment  objectives,  but if they do not,  the Fund will  withdraw  from the
master  portfolio,  receiving  either cash or  securities  in exchange  for its
interest in the master portfolio.  The Trustees would then consider whether the
Fund should hire its own investment adviser,  invest in a different  portfolio,
or take other action.

YEAR 2000 READINESS

Like  other  mutual  funds,   governmental  and  business   organizations   and
individuals  around the  world,  the Fund could be  adversely  affected  if the
computer systems used by the Investors Bank, AAM and other service providers do
not properly  process and  calculate  date-related  information  from and after
January 1, 2000.  Each of the above  entities is taking  steps that it believes
are reasonably designed to address Year 2000 Readiness with respect to computer
systems that it uses and to obtain reasonable  assurances that comparable steps
are being taken by the Fund's  other  major  service  providers.  At this time,
however, there can be no assurance that these steps will be sufficient to avoid
any adverse impact to the Fund.

                                      11

<PAGE>

                                  APPENDIX A

THE  FOLLOWING  ARE  DESCRIPTIONS  OF CERTAIN  TYPES OF SECURITIES IN WHICH THE
PORTFOLIO MAY INVEST:

REPURCHASE  AGREEMENTS.  The  Portfolio may enter into  repurchase  agreements,
which are  agreements by which a person  obtains a security and  simultaneously
commits to return the security to the seller at an agreed upon price (including
principal and interest) on an agreed upon date within a number of days from the
date  of  purchase.  In  substance,  a  repurchase  agreement  is a loan by the
applicable Portfolio  collateralized with securities.  Such lending Portfolio's
Custodian or its agent will hold the security as collateral  for the repurchase
agreement.  All repurchase  transactions must be collateralized  initially at a
value at least equal to 102% of the  repurchase  price and  counterparties  are
required to deliver additional  collateral in the event the market value of the
collateral falls below 100%.

SECURITIES  LENDING.  The  Portfolio may lend up to 33 1/3% of its portfolio of
securities  pursuant  to  agreements  requiring  that the loan be  continuously
secured  by cash or  equivalent  collateral  or by a letter  of  credit or bank
guarantee in favor of the  Portfolio at least equal at all times to 100% of the
market value plus accrued  interest on the securities  lent. The Portfolio will
continue  to receive  interest  on the  securities  lent  while  simultaneously
seeking to earn interest on the  investment of cash  collateral.  Collateral is
marked to market daily.  Loans are subject to  termination  by the Portfolio or
the  borrower at any time and are,  therefore,  not  considered  to be illiquid
investments.

VARIABLE AND FLOATING RATE INSTRUMENTS. Certain of the obligations purchased by
the Portfolio may carry  variable or floating rates of interest and may include
variable amount master demand notes. A floating rate security  provides for the
automatic  adjustment of its interest  rate whenever a specified  interest rate
changes. A variable rate security provides for the automatic establishment of a
new interest  rate on set dates.  Variable and floating  rate  instruments  may
include  variable  amount  master  demand  notes that  permit the  indebtedness
thereunder  to vary in addition to providing  for periodic  adjustments  in the
interest  rate.  There may be no active  secondary  market  with  respect  to a
particular  variable or floating rate  instrument.  Nevertheless,  the periodic
readjustments  of their  interest rates tend to assure that their value to such
Portfolios  will  approximate  their par  value.  Further,  some of the  demand
instruments  purchased  by such  Portfolios  derive  their  liquidity  from the
ability of the holder to demand repayment from the issuer or from a third party
providing  credit  support.  The  creditworthiness  of issuers of variable  and
floating rate  instruments  and their  ability to repay  principal and interest
will be continuously monitored by AAM.

WHEN-ISSUED  AND DELAYED  DELIVERY  TRANSACTIONS.  The  Portfolio may invest in
when-issued and delayed delivery securities, which are securities purchased for
delivery beyond the normal settlement date at a stated price and yield, thereby
involving the risk that the yield  obtained will be less then that available in
the market at delivery.  The purchase of securities on a when-issued or delayed
delivery basis has the effect of leveraging. When such a security is purchased,
the Custodian will set aside cash or

                                      12

<PAGE>

liquid  securities  to satisfy  the  purchase  commitment  unless the  relevant
Portfolio  has entered into an  offsetting  agreement  to sell the  securities.
These  segregated  securities will be valued at market,  and additional cash or
securities  will be  segregated  if  necessary  so that the market value of the
account  will  continue  to satisfy  the  purchase  commitment.  The  Portfolio
generally  will not pay for such  securities  or earn  interest  on them  until
received.  The Portfolio will only purchase  when-issued  and delayed  delivery
securities  for the  purpose  of  acquiring  portfolio  securities  and not for
speculative  purposes.  However,  the  Portfolio  may sell these  securities or
dispose of the commitment  before the settlement date if it is deemed advisable
as a matter of investment strategy.

ZERO COUPON  SECURITIES.  The Portfolio  may invest in zero coupon  securities.
Zero coupon  securities are  securities  sold at a discount to par value and on
which  interest  payments  are not made during the life of the  security.  Upon
maturity,  the holder is entitled to receive the par value of the security. The
Portfolio is required to accrue income with respect to these  securities  prior
to the receipt of cash payments.  Because the Fund will distribute its share of
this accrued income to  shareholders,  to the extent that the  shareholders and
shareholders  of other  mutual  funds  that  invest in the  Portfolio  elect to
receive  dividends in cash rather than reinvesting such dividends in additional
shares,  the  Portfolio  will have fewer  assets with which to purchase  income
producing  securities.  The Portfolio  may also invest in zero coupon  treasury
securities.

                                      13

<PAGE>

For  investors  who want  more  information  about  the  Trust,  the  following
documents are available free upon request:

STATEMENT OF  ADDITIONAL  INFORMATION  (SAI):  The SAI provides  more  detailed
information about the Trust and is legally a part of this prospectus.

ANNUAL/SEMI-ANNUAL   REPORTS:   The  Fund's  and  the  Portfolio's  annual  and
semi-annual  reports  provide  additional  information  about  the  Portfolio's
investments.

You can get free copies of the SAI, the reports,  other information and answers
to your questions about the Fund by contacting the Fund at 1-888-MERRMAC.

You can view the Fund's SAI and the reports at the Public Reference Room of the
Securities and Exchange Commission (SEC).

For a fee, you can get text-only copies by writing to the Public Reference Room
of the SEC, Washington, D.C. 20549-6009. You can also call 1-800-SEC-0330.

You can also view the SAI and receive the reports free from the SEC's  Internet
website at http://www.sec.gov.






                        Merrimac U.S. Government Series




                                      Investment Company Act file no. 811-08741



                                      14

<PAGE>

                                MERRIMAC SERIES

                        Merrimac U.S. Government Series

                      STATEMENT OF ADDITIONAL INFORMATION
                                 June __, 1999

This Statement of Additional  Information (the "SAI") is not a Prospectus,  but
it relates to the Prospectus of Merrimac U.S.  Government Series dated June __,
1999.  You  can  get a free  copy  of the  Prospectus  for  the  Merrimac  U.S.
Government  Series or the most recent annual and semi-annual  reports,  request
other information and discuss your questions about the Merrimac U.S. Government
Series by contacting Merrimac Series at 1-888-MERRMAC.

You can view the  Fund's  Prospectus  as well as other  reports  at the  Public
Reference Room of the Securities and Exchange Commission ("SEC").

You can get text-only copies for a fee by calling the SEC at  1-800-SEC-0330 or
for free from the SEC's Internet website at http://www.sec.gov.


                               TABLE OF CONTENTS

<TABLE>
<CAPTION>

<S>                              <C>     <C>                          <C>

                                 Page                                 Page

Fund History                       2     Capital Stock                 10
Description of the Fund, Its             Purchase, Redemption and
 Investments and Risks             2     Valuation of Shares           12
 Classification                    2      Purchase and Redemption of
 Investment Strategies and Risks   3      Shares                       12
 Fund Policies                     4      Valuation of Shares          12
Management of the Trust            5     Taxation of the Trust         13
Investment Advisory and Other            Independent Auditors          15
 Services                          7     Counsel                       15
 Investment Adviser and Subadviser 7     Appendix                      16
 Distributor                       8     
 Distribution and Shareholder             
  Servicing Plans                  9
 Administrator, Transfer Agent, 
  Custodian and Fund Accountant    9
Brokerage Allocation and Other 
Practices                         10

</TABLE>

<PAGE>
 
                                 FUND HISTORY

Merrimac U. S.  Government  Series  (the  "Fund") is a series or  sub-trust  of
Merrimac  Series (the "Trust").  The Trust is a business trust  organized under
the laws of the State of Delaware  pursuant to a Master Trust  Agreement  dated
March 30, 1998, as amended, and registered as an open-end management investment
company  under the  Investment  Company Act of 1940 Act (the "1940  Act").  The
Trust is composed of four other series which are not part of this SAI.

The  Merrimac  U.S.  Government  Portfolio  (the  "Portfolio")  is a series  or
sub-trust of the Merrimac Master  Portfolio (the "Portfolio  Trust"),  a common
law trust  organized  under New York law on October 30, 1996,  registered as an
open-end management investment company under the 1940 Act.

This SAI is not a  prospectus  and is only  authorized  for  distribution  when
preceded or accompanied by the Fund's current  Prospectus  dated June __, 1999,
(the "Prospectus"). This SAI supplements and should be read in conjunction with
the  Prospectus,  a copy of which may be  obtained  without  charge by  calling
1-888-MERRMAC.  This SAI is not an offer of the Fund for which an investor  has
not received a Prospectus.

              DESCRIPTION OF THE FUND, ITS INVESTMENTS AND RISKS

CLASSIFICATION

The  Fund  is a  diversified  open-end,  management  investment  company  and a
separate series of the Trust.

MASTER/FEEDER  STRUCTURE.  The Fund invests all of its investable assets in the
U.S. Government  Portfolio.  The Fund is sometimes referred to in this SAI as a
feeder fund.

The Portfolio has the same investment  objective and  restrictions as the Fund.
Because the feeder fund invests all of its investable  assets in the Portfolio,
the  description  of  the  Fund's  investment  policies,  techniques,  specific
investments and related risks that follows also applies to the Portfolio.

In addition to the feeder fund, other feeder funds may invest in the Portfolio,
and  information   about  the  other  feeder  funds  is  available  by  calling
1-888-637-7622.  The other  feeder  funds  invest in the  Portfolio on the same
terms as the Fund and bear a proportionate  share of the Portfolio's  expenses.
The other feeder funds may sell shares on different terms and under a different
pricing  structure  than the  Fund,  which  may  produce  different  investment
results.

There are  certain  risks  associated  with an  investment  in a  master-feeder
structure.  Large scale  redemptions by other feeder funds in the Portfolio may
reduce the diversification of the Portfolio's investments,  reduce economies of
scale and increase the Portfolio's operating expenses. If the Portfolio Trust's
Board  of  Trustees  approves  a  change  to the  investment  objective  of the
Portfolio that is not approved by the Trust's Board of Trustees, the Fund would
be required to withdraw its investment in the Portfolio and engage the services
of an  investment  adviser or find a substitute  master fund.  Withdrawal  of a
fund's interest in its Portfolio, which may be required by the Trust's Board of
Trustees without shareholder  approval,  might cause the fund to incur expenses
it would not otherwise be required to pay.

                                       2

<PAGE>

INVESTMENT STRATEGIES AND RISKS

MONEY  MARKET   INSTRUMENTS  AND  REPURCHASE   AGREEMENTS.   The  money  market
instruments in which the Portfolio invests include  short-term U.S.  Government
securities (defined below) and repurchase agreements.

U.S.  Government  securities include securities which are direct obligations of
the U.S.  Government  backed by the full faith and credit of the United States,
and securities issued by agencies and instrumentalities of the U.S. Government,
which may be guaranteed by the U.S. Treasury or supported by the issuer's right
to borrow from the U.S.  Treasury or may be backed by the credit of the federal
agency or instrumentality  itself.  Agencies and  instrumentalities of the U.S.
Government  include,  but are not limited to,  Federal Land Banks,  the Federal
Farm Credit  Bank,  the Central  Bank for  Cooperatives,  Federal  Intermediate
Credit  Banks,  Federal  Home Loan  Banks  and the  Federal  National  Mortgage
Association.

A repurchase agreement is an agreement under which the Portfolio acquires money
market instruments (U.S. Government  securities) from a commercial bank, broker
or dealer,  subject to resale to the  seller at an  agreed-upon  price and date
(normally  the next business  day).  The resale price  reflects an  agreed-upon
interest  rate  effective  for  the  period  the  instruments  are  held by the
Portfolio  and is  unrelated  to the  interest  rate  on the  instruments.  The
instruments acquired by the Portfolio (including accrued interest) must have an
aggregate  market  value in excess of the resale  price and will be held by the
custodian  bank for the  Portfolio  until  they are  repurchased.  The Board of
Trustees of the Portfolio  Trust will monitor the standards that the investment
adviser or sub-adviser will use in reviewing the  creditworthiness of any party
to  a  repurchase  agreement  with  the  Portfolio.  See  "Investment  Advisory
Services" for information regarding the investment adviser and sub-adviser.

The use of repurchase  agreements  involves certain risks. For example,  if the
seller defaults on its obligation to repurchase the instruments acquired by the
Portfolio at a time when their market value has  declined,  the  Portfolio  may
incur a loss.  If the seller  becomes  insolvent or subject to  liquidation  or
reorganization  under  bankruptcy or other laws, a court may determine that the
instruments  acquired  by  the  Portfolio  are  collateral  for a  loan  by the
Portfolio  and  therefore  are  subject to sale by the  trustee in  bankruptcy.
Finally,  it is possible that the Portfolio may not be able to substantiate its
interest in the instruments it acquires. It is expected that these risks can be
controlled through careful documentation and monitoring.

"WHEN-ISSUED" AND "DELAYED  DELIVERY"  SECURITIES.  The Portfolio may invest in
securities  purchased on a "when-issued" or "delayed delivery" basis.  Delivery
and payment for securities purchased on a when-issued or delayed delivery basis
will normally take place 15 to 45 days after the date of the  transaction.  The
payment  obligation  and interest rate on the  securities are fixed at the time
that the Portfolio enters into the commitment,  but interest will not accrue to
the Portfolio  until delivery of and payment for the  securities.  Although the
Portfolio  will only make  commitments to purchase  "when-issued"  and "delayed
delivery"  securities with the intention of actually  acquiring the securities,
the  Portfolio may sell the  securities  before the  settlement  date if deemed
advisable by their investment adviser or sub-adviser.

Unless the  Portfolio  has entered  into an  offsetting  agreement  to sell the
securities  purchased on a "when-issued" or "forward commitment" basis, cash or
liquid  obligations  with a market value equal to the 

                                       3

<PAGE>

amount of the  Portfolio's  commitment  will be segregated with the Portfolio's
custodian bank. If the market value of these  securities  declines,  additional
cash or securities will be segregated  daily so that the aggregate market value
of the segregated securities equals the amount of the Portfolio's commitment.
  
Securities purchased on a "when-issued" and "delayed delivery" basis may have a
market value on delivery  which is less than the amount paid by the  Portfolio.
Changes  in  market  value may be based  upon the  public's  perception  of the
creditworthiness  of the  issuer or  changes  in the level of  interest  rates.
Generally,  the  value  of  "when-issued",   "delayed  delivery"  and  "forward
commitment"  securities will fluctuate  inversely to changes in interest rates,
i.e.,  they will  appreciate in value when interest rates fall and will decline
in value when interest rates rise.

FUND POLICIES

The Fund and the Portfolio have adopted the following fundamental policies. The
Fund and Portfolio  fundamental policies cannot be changed unless the change is
approved by a "vote of the  outstanding  voting  securities" of the Fund or the
Portfolio,  as the case may be, which phrase as used herein means the lesser of
(i) 67% or more of the voting  securities of the Fund or Portfolio present at a
meeting,  if the holders of more than 50% of the outstanding  voting securities
of the Fund or Portfolio are present or represented by proxy, or (ii) more than
50% of the outstanding voting securities of the Fund or Portfolio.

As a matter of fundamental policy, the Fund (Portfolio) may not:

        (1) borrow money,  except as a temporary  measure for  extraordinary or
        emergency  purposes  or  to  facilitate   redemptions,   provided  that
        borrowing  does not  exceed an amount  equal to 33 1/3% of the  current
        value  of  the   Portfolio's   assets  taken  at  market  value,   less
        liabilities, other than borrowings;

        (2)  purchase  securities  on margin  (except for  delayed  delivery or
        when-issued  transactions or such  short-term  credits as are necessary
        for the clearance of transactions);

        (3) make  loans to any  person  or firm;  provided,  however,  that the
        making of a loan shall not include entering into repurchase agreements,
        and  provided  further  that  the  Portfolio  may  lend  its  portfolio
        securities to  broker-dealers or other  institutional  investors if the
        aggregate value of all securities loaned does not exceed 33 1/3% of the
        value of the Portfolio's total assets;

        (4) engage in the business of  underwriting  the  securities  issued by
        others,  except that the Portfolio will not be deemed to be engaging in
        the  business of  underwriting  with respect to the purchase or sale of
        securities subject to legal or contractual restrictions on disposition;

        (5) issue senior  securities,  except as  permitted  by its  investment
        objective,  policies and  restrictions,  and except as permitted by the
        1940 Act; and

                                       4

<PAGE>

        (6) purchase or sell real estate,  commodities,  or commodity contracts
        unless  acquired as a result of ownership of  securities,  and provided
        further  that the  Portfolio  may invest in  securities  backed by real
        estate and in financial futures contracts and options thereon.

If any  percentage  restriction  described  above is  adhered to at the time of
investment,  a subsequent increase or decrease in the percentage resulting from
a change in the net  assets  of the  Portfolio  (Fund)  will not  constitute  a
violation of the restriction.  The above  restrictions  also apply to the Fund,
with  the  exception  that the Fund may  invest  all of its  investable  assets
without limitation in the Portfolio.

                            MANAGEMENT OF THE TRUST

BOARD OF TRUSTEES

Overall responsibility for management and supervision of the Trust and the Fund
rests  with  the  Board of  Trustees.  The  Trustees  approve  all  significant
agreements  between  the Trust  and the  persons  and  companies  that  furnish
services to the Trust or the Funds,  including agreements with its distributor,
custodian,  transfer agent, investment adviser,  sub-adviser and administrator.
The day-to-day  operations of the Fund are delegated to their Sub-Adviser.  The
SAI  contains  background  information  regarding  each  of  the  Trustees  and
executive officers of the Trust.

TRUSTEES  AND  OFFICERS.  The names,  addresses,  dates of birth and  principal
occupation(s)  during the last five years of the  Trustees  and officers of the
Trust and the  Portfolio  Trust are listed below.  The business  address of the
Trustees and  officers of the Trust and the  Portfolio  Trust is 200  Clarendon
Street, Boston, Massachusetts 02116.

TRUSTEES AND OFFICERS OF THE TRUST

KEVIN J. SHEEHAN,  TRUSTEE*,  6/22/51, Director 1990 - present,  President June
1992 -  present,  Chairman  and Chief  Executive  Officer  June 1995 - present,
Investors Bank & Trust Company,  Chairman and Chief Executive Officer June 1995
- - present, Investors Financial Services Corp.

FRANCIS J. GAUL, JR., TRUSTEE,  9/25/43,  Private Investor July 1998 - present,
Director and Principal,  Triad Investment  Management  Company June 1997 - June
1998,  Vice  President,   Triad  Investment   Management  Company   (Registered
Investment  Adviser) July 1996 - May 1997,  Vice President & Resident  Manager,
Goldman  Sachs & Co.  (Investment  Banking &  Institutional  Sales) June 1993 -
January 1996.

EDWARD F. HINES, JR., TRUSTEE,  9/5/45, Partner 1977 - present,  Choate, Hall &
Stewart.

THOMAS E. SINTON,  TRUSTEE,  8/26/32,  Retired,  Managing  Director,  Corporate
Accounting  Policy,  April 1993 - October 1996 and  Consultant,  January 1993 -
March 1996, Bankers Trust Company.

GEORGE A. RIO,  PRESIDENT,  1/2/55,  Executive Vice  President,  Client Service
Director  of  Funds  Distributor,  Inc.,  April  1998 -  present;  Senior  Vice
President,  Senior Key Account Manager for Putnam Mutual Funds, June 1995 March
1998; Director of Business  Development for First Data Corporation,  May 1994 -
June 1995; Senior Vice President and Manager of Client Services and Director of
Internal Audit at The Boston Company, September 1983 - May 1994.

                                       5

<PAGE>

PAUL J. JASINSKI,  TREASURER AND CHIEF  FINANCIAL  OFFICER,  2/17/47,  Managing
Director, Investors Bank & Trust Company, 1990 - present.

SUSAN C. MOSHER,  SECRETARY,  1/29/55,  Director,  Mutual Fund Administration -
Legal Administration, Investors Bank & Trust Company, 1995 - present, Associate
Counsel, 440 Financial Group of Worcester, Inc., 1993 - 1995.

ANDREW  S.  JOSEF,  ASSISTANT  SECRETARY,   2/25/64,   Director,   Mutual  Fund
Administration - Legal  Administration,  Investors Bank & Trust Company, 1997 -
present,  Senior Associate,  Sullivan & Worcester LLP, 1995 - 1997,  Associate,
Goodwin, Procter & Hoar 1993 - 1995.

TRUSTEES AND OFFICERS OF THE PORTFOLIO TRUST

KEVIN J. SHEEHAN, TRUSTEE**,  6/22/51, Director since 1990, President June 1992
- - present, Chairman and Chief Executive Officer June 1995 - present,  Investors
Bank & Trust Company, Chairman and Chief Executive Officer June 1995 - present,
Investors Financial Services Corp.

FRANCIS J. GAUL, JR., TRUSTEE,  9/25/43,  Private Investor July 1998 - present,
Director and Principal,  Triad Investment  Management  Company June 1997 - June
1998,  Vice  President,   Triad  Investment   Management  Company   (Registered
Investment  Adviser) July 1996 - May 1997,  Vice President & Resident  Manager,
Goldman  Sachs & Co.  (Investment  Banking &  Institutional  Sales) June 1993 -
January 1996.

EDWARD F. HINES, JR., TRUSTEE,  9/5/45, Partner 1977 - present,  Choate, Hall &
Stewart.

THOMAS E. SINTON,  TRUSTEE,  8/26/32,  Retired,  Managing  Director,  Corporate
Accounting  Policy,  April 1993 - October 1996 and  Consultant,  January 1993 -
March 1996, Bankers Trust Company.

PAUL J. JASINSKI,  PRESIDENT,  TREASURER AND CHIEF FINANCIAL OFFICER,  2/17/47,
Managing Director, Investors Bank & Trust Company, 1990 - present.

TIMOTHY J.  COYNE,  VICE  PRESIDENT,  5/9/67,  Director,  Corporate  Marketing,
Investors  Bank & Trust  Company,  1997 - present,  Vice  President,  Corporate
Sales,  Dreyfus  Corporation,  1995 - 1997,  Assistant Vice President,  Concord
Financial Corp., 1992 - 1995.

CHRISTOPHER  J. QUINN,  ASSISTANT VICE  PRESIDENT,  5/6/66,  Manager,  Advisory
Client  Services,  Investors  Bank & Trust  Company,  1996 -  present,  Service
Specialist  Mutual Funds,  Fleet Bank, 1994 - 1996,  Executive Sales Assistant,
Concord Financial Corp., 1993 - 1994.

SUSAN C. MOSHER,  SECRETARY,  1/29/55,  Director,  Mutual Fund Administration -
Legal Administration, Investors Bank & Trust Company, 1995 - present, Associate
Counsel, 440 Financial Group of Worcester, Inc., 1993 - 1995.

ANDREW  S.  JOSEF,  ASSISTANT  SECRETARY,   2/25/64,   Director,   Mutual  Fund
Administration - Legal  Administration,  Investors Bank & Trust Company, 1997 -
present,  Senior Associate,  Sullivan & Worcester LLP, 1995 - 1997,  Associate,
Goodwin, Procter & Hoar 1993 - 1995.

                                       6

<PAGE>

RAYMOND O'NEILL, ASSISTANT TREASURER AND ASSISTANT SECRETARY, 4/12/62, Managing
Director,  IBT Trust & Custodial Services (Ireland) LMTD, 1994 - present;  Vice
President, Atlantic Corporate Management Limited, 1991 - 1994.



*Indicates  that the Trustee is an "interested  person" of the Trust as defined
 in the 1940 Act.
**Indicates  that the Trustee is an "interested  person" of the Portfolio Trust
  as defined in the 1940 Act.

COMPENSATION OF THE TRUSTEES AND OFFICERS.  Neither the Trust nor the Portfolio
Trust compensates the Trustees or officers of the Trust and the Portfolio Trust
who are affiliated with Investors Bank or the Distributor.

The  Trustees of the  Portfolio  Trust are paid an annual  retainer of $10,000,
payable in equal  quarterly  installments,  and a $2,500  meeting  fee for each
quarterly meeting attended. The Fund bears its pro rata allocation of Trustees'
fees paid by the Portfolio to the Trustees of the Portfolio Trust. The Trustees
of the Trust are paid an annual retainer of $3,000,  payable in equal quarterly
installments,  which  retainer shall increase by $1,000 per series of the Trust
beyond the initial three series.  The following table reflects the compensation
paid by the  Trust,  by the  Portfolio  Trust and by another  related  open end
investment  company,  to each Trustee for the fiscal period ended  December 31,
1998.

<TABLE>
<CAPTION>

<S>               <C>              <C>                      <C>

                  Aggregate        Pension or Retirement    Total Compensation
                  Compensation     Benefits Accrued as      From Trust and Fund
Name of Trustee   From the Trust   Part of Fund's Expenses  Complex *
- ---------------   --------------   -----------------------  ---------

Kevin J. Sheehan       $0                    $0                     $0

Francis J. Gaul, 
Jr.                  $1,167                  $0                  $25,000

Edward F. Hines, 
Jr.                  $1,167                  $0                  $25,000

Thomas E. Sinton     $1,167                  $0                  $25,000


*Fund Complex  consists of the Trust,  the Portfolio Trust, the Merrimac Global
Cash Fund and the Merrimac  Funds,  comprising  eight series as of December 31,
1998.

</TABLE>


                    INVESTMENT ADVISORY AND OTHER SERVICES

INVESTMENT ADVISER AND SUBADVISER

The Portfolio retains  Investors Bank & Trust Company  ("Investors Bank" or the
"Adviser") as its investment  adviser.  The Investment  Adviser  Agreement (the
"Adviser  Agreement")  between  Investors Bank and the Portfolio  provides that
Investors  Bank will manage the  operations  of the  Portfolio,  subject to the
policies established by the Board of Trustees of the Trust. Investors Bank also
provides  office  space,  facilities,  equipment  and  personnel  necessary  to
supervise  the  Portfolio's  operations  and  pays  the  compensation  of  such
Portfolio's  officers,  employees and directors affiliated with Investors Bank.
The Portfolio  pays Investors Bank a unitary fee for servicing the Portfolio as
Investment  Adviser,  Administrator,  Custodian,  Fund  Accountant and Transfer
Agent.  For a description of the rate of  

                                       7

<PAGE>

compensation   that  the  Portfolio  pays  Investors  Bank  under  the  Adviser
Agreements, see "Administrator, Transfer Agent and Fund Accountant" below.

The Portfolio pays  Investors  Bank a fee for its services.  As of December 31,
1998, the Portfolio had not yet commenced operations.

Pursuant  to  an  Investment   Sub-Adviser   Agreement  (the  "AAM  Sub-Adviser
Agreement"),  Investors  Bank has retained  Allmerica  Asset  Management,  Inc.
("AAM") as sub-adviser  to the Portfolio.  AAM is compensated by Investors Bank
at no additional cost to the Portfolio. Subject to the supervision of Investors
Bank and of the  Portfolio  Trust's  Board of  Trustees,  AAM  furnishes to the
Portfolio  investment  research,  advice and  supervision  and determines  what
securities will be purchased, held or sold by the Portfolio. AAM is rendered an
annual fee,  computed and paid  monthly,  based on the average daily net assets
("ANA") of the  Portfolio  according to the  following  schedule:  0.09% on the
first $500  million in assets;  0.07% on the next $500  million in assets,  and
0.06% on assets  exceeding $1 billion.  As of December 31, 1998,  the Portfolio
had not yet commenced operations.

The Portfolio bears the expense of its operations  other than those incurred by
AAM. Among the other expenses, the Portfolio pays share pricing and shareholder
servicing fees and expenses;  custodian  fees and expenses;  legal and auditing
fees and expenses; expenses of shareholder reports;  registration and reporting
fees and expenses; and the Portfolio Trust's Trustee fees and expenses.

DISTRIBUTOR

Shares of the Fund are continuously distributed by Funds Distributor, Inc. (the
"Distributor")  pursuant to a Distribution  Agreement with the Trust dated June
1, 1998. The Distributor  makes itself available to receive purchase orders for
the Fund's shares. Pursuant to the Distribution Agreement,  the Distributor has
agreed to use its best efforts to obtain orders for the continuous  offering of
the  Fund's  shares.   The   Distributor   receives  no  commissions  or  other
compensation  from the Fund for its services,  but receives  compensation  from
Investors Bank for services it performs in acting as the Fund's Distributor.

Funds Distributor is registered with the SEC as a broker-dealer and is a member
of the National Association of Securities Dealers. Funds Distributor is located
at 60 State Street, Suite 1300, Boston,  Massachusetts 02109. Funds Distributor
is an indirect  wholly-owned  subsidiary of Boston Institutional Group, Inc., a
holding company all of whose outstanding shares are owned by key employees.

DISTRIBUTION AND SHAREHOLDER SERVICING PLANS

The Board of  Trustees  of the Trust has  adopted a Plan of  Distribution  (the
"Distribution  Plan")  under  Rule  12b-1 of the 1940 Act with  respect  to the
Investment  Class of shares of the Fund after having  concluded that there is a
reasonable  likelihood  that the  Distribution  Plan will benefit the Funds and
their shareholders.  The Distribution Plan provides that the Distribution Agent
(defined  therein)  shall  receive a fee from the Fund at an annual rate not to
exceed  0.25%  of the ANA of the  Fund  attributable  to  shareholders  who are
clients of the Distribution  Agent, plus  reimbursement of direct out of pocket
expenditures incurred in connection with the offer or sale or shares, including
expenses  relating  to the  preparation,  printing  and  distribution  of sales
literature and reports.

The  Distribution  Plan  will  initially  be  effective  for one year  from its
effective date. Thereafter, the Distribution Plan shall continue in effect only
if such  continuance  is  specifically  approved at least

                                       8

<PAGE>

annually by a vote of both a majority of the Board of Trustees of the Trust and
a majority of the Trustees of the Trust who are not "interested persons" of the
Trust (the  "Disinterested  Trustees.") The Distribution Plan may be terminated
at any time by a vote of a majority of the Disinterested Trustees, or by a vote
of a majority of the outstanding voting shares of the Fund.

The Board of Trustees of the Trust have also  adopted a  Shareholder  Servicing
Plan  (the  "Servicing  Plan")  with  respect  to the  Institutional  Class and
Investment  Class  shares of the Fund after  having  concluded  that there is a
reasonable  likelihood  that the  Servicing  Plan will benefit the Fund and its
shareholders.  The Servicing Plan provides that the Shareholder Servicing Agent
shall  receive a fee from the Fund at an annual rate not to exceed 0.25% of the
ANA of the Fund.

The Servicing  Plan will initially be effective for one year from its effective
date. Thereafter, the Servicing Plan continues in effect if such continuance is
specifically  approved  at least  annually  by a vote of both a majority of the
Board of Trustees of the Trust and a majority of the  Qualified  Trustees.  The
Servicing  Plan  requires that at least  quarterly,  the Treasurer of the Trust
provide to the  Trustees  of the Trust and that the  Trustees  review a written
report of the amounts expended  pursuant to the Servicing Plan and the purposes
for which such expenditures were made. The Servicing Plan further provides that
the selection and nomination of the Trust's Qualified  Trustees is committed to
the  discretion  of the  Trust's  disinterested  Trustees  then in office.  The
Servicing  Plan may be  terminated  at any time by a vote of a majority  of the
Qualified Trustees, or by a vote of a majority of the outstanding voting shares
of the Fund.  The Plan may not be amended to increase  materially the amount of
the Fund's permitted expenses  thereunder without the approval of a majority of
the outstanding voting securities of the affected Class of the Fund and may not
be  materially  amended in any case  without a vote of the majority of both the
Trust's Trustees and the Trust's Qualified Trustees.

ADMINISTRATOR, TRANSFER AGENT, CUSTODIAN AND FUND ACCOUNTANT

Investors  Bank serves as  Administrator  to the Fund and IBT Trust & Custodial
Services (Ireland) LMTD ("IBT Ireland"), a subsidiary of Investors Bank, serves
as Administrator to the Portfolio.  The services provided by Investors Bank and
IBT Ireland include certain accounting, clerical and bookkeeping services, Blue
Sky (for the Fund only),  corporate  secretarial services and assistance in the
preparation and filing of tax returns and reports to shareholders  and the SEC.
Investors  Bank also serves as transfer and dividend  paying agent for the Fund
and IBT Fund Services  (Canada) Inc.,  ("IBT Canada") a subsidiary of Investors
Bank,  serves as transfer  and  dividend  paying  agent for the  Portfolio.  As
transfer agent,  Investors Bank is responsible  for the issuance,  transfer and
redemption of interests,  the establishment and maintenance of accounts and the
payment  of  distributions  for the  Fund and IBT  Canada  is  responsible  for
maintaining records of holders in interest and for the payment of distributions
for the Portfolio.

Investors  Bank also acts as custodian for the Fund and for the  Portfolio.  As
custodian,  Investors Bank holds cash,  securities and other assets of the Fund
and the  Portfolio  as required by the 1940 Act. IBT Canada also serves as fund
accounting agent for the Fund and the Portfolio.  As fund accounting agent, IBT
Canada performs certain accounting,  clerical and bookkeeping services, and the
daily calculation of net asset value for the Fund and Portfolio.

For  its  services  as  Investment  Adviser,  Administrator,   Transfer  Agent,
Custodian and Fund  Accounting  Agent,  the Portfolio  pays  Investors  Bank an
aggregate fee, which is calculated daily and paid monthly, at an annual rate of
0.17% of the ANA of the Portfolio. For its services as Administrator,  Transfer

                                       9

<PAGE>

Agent,  Custodian and Fund  Accounting  Agent,  the Fund pays Investors Bank an
aggregate fee, which is calculated daily and paid monthly, at an annual rate of
0.01% of ANA of the Fund.

                   BROKERAGE ALLOCATION AND OTHER PRACTICES

Purchases  and sales of  securities  for the  Portfolio  usually are  principal
transactions.  Securities  are normally  purchased  directly from the issuer or
from an  underwriter or market maker for the  securities.  There usually are no
brokerage  commissions  paid  for  such  purchases.   The  Portfolio  does  not
anticipate  paying  brokerage  commissions.   Any  transaction  for  which  the
Portfolio  pays a brokerage  commission  will be effected at the best price and
execution  available.  Purchases  from  underwriters  of  securities  include a
commission or concession  paid by the issuer to the  underwriter  and purchases
from dealers  serving as market makers  include the spread  between the bid and
asked price.

Allocations of transactions,  including their frequency,  to various dealers is
determined by AAM in its best judgment and in a manner deemed to be in the best
interest of the Fund and the other  investors in the  Portfolio  rather than by
any  formula.  The primary  consideration  is prompt  execution of orders in an
effective manner at the most favorable price.

Investment  decisions for the Portfolio will be made  independently  from those
for any other account or investment company that is or may in the future become
managed by AAM. If,  however,  the Portfolio and other accounts  managed by AAM
are contemporaneously engaged in the purchase or sale of the same security, the
transactions  may be  averaged  as to price  and  allocated  equitably  to each
account.  In some cases,  this policy might adversely  affect the price paid or
received  by the  Portfolio  or the  size of the  position  obtainable  for the
Portfolio.  In addition,  when  purchases or sales of the same security for the
Portfolio and for other accounts  managed by AAM occur  contemporaneously,  the
purchase  or sale  orders  may be  aggregated  in order  to  obtain  any  price
advantages available to large denomination purchases or sales.

                                 CAPITAL STOCK

Under the Master Trust  Agreement,  the Trustees of the Trust have authority to
issue an unlimited  number of shares of beneficial  interest,  par value $0.001
per share,  of the Fund.  The Master Trust  Agreement  authorizes  the Board of
Trustees to divide the shares into any number of classes or series,  each class
or   series   having   such   designations,    powers,   preferences,   rights,
qualifications,  limitations  and  restrictions,  as shall be determined by the
Board subject to the 1940 Act and other  applicable law. The shares of any such
additional  classes or series  might  therefore  differ  from the shares of the
present  class  and  series  of  capital  stock  and  from  each  other  as  to
preferences,   conversion  or  other  rights,   voting  powers,   restrictions,
limitations  as  to  dividends,   qualifications  or  terms  or  conditions  of
redemption,  subject to applicable  law, and might thus be superior or inferior
to the other classes or series in various characteristics.

The Trust generally is not required to hold meetings of its shareholders. Under
the Master  Trust  Agreement,  however,  shareholder  meetings  will be held in
connection with the following matters:  (1) the election or removal of Trustees
if a meeting is called for such  purpose;  (2) the  adoption of any  investment
advisory contract;  (3) any amendment of the Master Trust Agreement (other than
amendments changing the name of the Trust,  supplying any omission,  curing any
ambiguity or curing,  correcting or supplementing any defective or inconsistent
provision thereof);  and (4) such additional matters as may be required by law,
the Master Trust Agreement, the By-laws of the Trust or any registration of the
Trust  with the SEC or any  state,  or as the  Trust's  Trustees  may  consider
necessary  or 

                                      10

<PAGE>

desirable.  The  shareholders  also  would  vote upon  changes  in  fundamental
investment objectives, policies or restrictions.

Each Trustee serves until the next meeting of shareholders,  if any, called for
the purpose of electing  Trustees and until the election and  qualification  of
his  successor  or until such Trustee  sooner dies,  resigns or is removed by a
vote of  two-thirds  of the  shares  entitled  to vote,  or a  majority  of the
Trustees. In accordance with the 1940 Act (i) the Trust will hold a shareholder
meeting  for the  election  of Trustees at such time as less than a majority of
the Trustees have been elected by  shareholders,  and (ii) if, as a result of a
vacancy in the Board of Trustees,  less than  two-thirds  of the Trustees  have
been elected by the shareholders, that vacancy will be filled only by a vote of
the  shareholders.  A  shareholders'  meeting  shall be held for the purpose of
voting upon the removal of a Trustee upon the written request of the holders of
not less than 10% of the outstanding shares. Upon the written request of ten or
more  shareholders  who have  been such for at least  six  months  and who hold
shares  constituting at least 1% of the outstanding  shares of the Fund stating
that such shareholders wish to communicate with the other  shareholders for the
purpose of obtaining the  signatures  necessary to demand a meeting to consider
removal of a  Trustee,  the Trust has  undertaken  to  disseminate  appropriate
materials at the expense of the requesting shareholders.

The Master Trust Agreement provides that the presence at a shareholder  meeting
in  person  or by proxy of at least  30% of the  shares  entitled  to vote on a
matter shall constitute a quorum.  Thus, a meeting of shareholders of the Trust
could  take  place  even if  less  than a  majority  of the  shareholders  were
represented  on its  scheduled  date.  Shareholders  would  in  such a case  be
permitted  to take action  which does not require a larger vote than a majority
of a quorum, such as the election of Trustees and ratification of the selection
of  auditors.  Some  matters  requiring  a larger  vote under the Master  Trust
Agreement,  such as  termination  or  reorganization  of the Trust and  certain
amendments  of the  Master  Trust  Agreement,  would  not be  affected  by this
provision;  nor would  matters  which  under the 1940 Act require the vote of a
"majority of the outstanding voting securities" as defined in the 1940 Act.

The Master Trust  Agreement  specifically  authorizes  the Board of Trustees to
terminate the Trust (or any series Fund thereof) by notice to the  shareholders
without  shareholder  approval.  The Board of Trustees  may by amendment to the
Master  Trust  Agreement  add to,  delete,  replace  or  otherwise  modify  any
provisions  relating to any series or class,  provided that before adopting any
such amendment without shareholder  approval,  the Board of Trustees determined
that  it  was  consistent  with  the  fair  and  equitable   treatment  of  all
shareholders  and, if shares have been issued,  shareholder  approval  shall be
required to adopt any  amendments  which would  adversely  affect to a material
degree the rights and preferences of the shares of any series or class.

Each share of the Fund has equal  voting  rights  with every other share of the
Fund, and all shares of the Fund vote as a single group except where a separate
vote of any  class is  required  by the  1940  Act,  the  laws of the  State of
Delaware,  the  Master  Trust  Agreement  or the  By-Laws,  or as the Board may
determine  in its sole  discretion.  Where a  separate  vote is  required  with
respect to one or more classes,  then the shares of all other classes vote as a
single  class,  provided  that,  as to any  matter  which  does not  affect the
interest of a particular  class,  only the holders of shares of the one or more
affected classes is entitled to vote.

Interests in the Portfolio  have no preemptive  or conversion  rights,  and are
fully  paid and  non-assessable,  except  as set forth in the  Prospectus.  The
Portfolio  Trust  normally will not hold meetings of holders of such  interests
except as required under the 1940 Act. The Portfolio Trust would be required to
hold a meeting of holders in the event that at any time less than a majority of
its Trustees  holding  office had

                                      11

<PAGE>

been elected by holders.  The Trustees of the Portfolio  Trust continue to hold
office until their successors are elected and have qualified. Holders holding a
specified  percentage of interests in a Portfolio may call a meeting of holders
in such  Portfolio  for the purpose of removing any  Trustee.  A Trustee of the
Portfolio  Trust may be removed upon a majority vote of the  interests  held by
holders in the Portfolio Trust qualified to vote in the election.  The 1940 Act
requires the  Portfolio  Trust to assist its holders in calling such a meeting.
Upon liquidation of a Portfolio, holders in such Portfolio would be entitled to
share pro rata in the net assets of the Portfolio available for distribution to
holders.  Each holder in the  Portfolio is entitled to a vote in  proportion to
its percentage interest in such Portfolio.


                 PURCHASE, REDEMPTION AND VALUATION OF SHARES

PURCHASE AND REDEMPTION OF SHARES

Information  on how to  purchase  and  redeem  shares and the time at which net
asset value of each share is determined is included in the Prospectus.

The Trust may suspend  the right to redeem Fund shares or postpone  the date of
payment  upon  redemption  for more than seven  days (i) for any period  during
which the New York Stock Exchange ("NYSE") and the Federal Reserve Bank ("Fed")
are closed (other than customary weekend or holiday closings) or trading on the
exchange is restricted; (ii) for any period during which an emergency exists as
a  result  of  which  disposal  by  the  Fund  of  securities  owned  by  it or
determination  by the Fund of the  value of its net  assets  is not  reasonably
practicable;  or (iii) for such  other  periods  as the SEC may  permit for the
protection of shareholders of the Fund.

The Trust intends to pay redemption  proceeds in cash for Fund shares redeemed.
Portfolio  securities  paid upon  redemption  of Fund  shares will be valued at
their then  current  market  value.  An investor may incur  brokerage  costs in
converting portfolio securities received upon redemption to cash. The Portfolio
has  advised the Trust that the  Portfolio  will not redeem  in-kind  except in
circumstances in which the Fund is permitted to redeem in-kind or except in the
event the Fund completely withdraws its interest from the Portfolio.

VALUATION OF SHARES

The following is a description  of the  procedures  used by the Fund in valuing
its assets.

The investment  securities in the Portfolio are valued based upon the amortized
cost  method  which  involves  valuing a  security  at its cost and  thereafter
assuming a constant  amortization  to  maturity  of any  discount  or  premium.
Although the amortized cost method  provides  consistency in valuation,  it may
result in  periods  during  which the stated  value of a security  is higher or
lower than the price the would receive if the security  were sold.  This method
of  valuation  is used in order to  stabilize  the NAV of shares of the Fund at
$1.00;  however,  there can be no  assurance  that the Fund's  NAV will  always
remain at $1.00 per share.

                             TAXATION OF THE TRUST

The Fund is treated as a separate  entity for accounting and tax purposes.  The
Fund will elect  (when it files its  initial  federal tax return) to be treated
and to qualify as a "regulated  investment  company"

                                      12

<PAGE>

("RIC")  under  Subchapter M of the Internal  Revenue Code of 1986,  as amended
(the "Code"),  and intends to continue to so qualify in the future. As such and
by complying with the  applicable  provisions of the Code regarding the sources
of its income, the timing of its distributions,  and the diversification of its
assets,  the Fund will not be subject to Federal  income tax on its  investment
company taxable income (i.e., all taxable income, after reduction by deductible
expenses,  other than its "net capital  gain," which is the excess,  if any, of
its net long-term  capital gain over its net  short-term  capital loss) and net
capital gain which are  distributed  to  shareholders  in  accordance  with the
timing and other requirements of the Code.

The Portfolio is treated as a partnership  for federal income tax purposes.  As
such, the Portfolio is not subject to federal  income  taxation.  Instead,  the
Fund must take into account,  in computing its federal income tax liability (if
any), its share of the Portfolio's income, gains, losses,  deductions,  credits
and tax  preference  items,  without regard to whether it has received any cash
distributions  from the  Portfolio.  Because the Fund invests its assets in the
Portfolio,  the Portfolio normally must satisfy the applicable source of income
and  diversification  requirements  in order for the Fund to satisfy them.  The
Portfolio will allocate at least annually among its investors,  each investor's
distributive  share of the  Portfolio's  net  investment  income,  net realized
capital gains, and any other items of income,  gain, loss, deduction or credit.
The Portfolio will make  allocations to the Fund in a manner intended to comply
with the Code and  applicable  regulations  and will make moneys  available for
withdrawal at appropriate times and in sufficient amounts to enable the Fund to
satisfy the tax distribution  requirements that apply to the Fund and that must
be satisfied in order to avoid  Federal  income  and/or excise tax on the Fund.
For purposes of applying the  requirements of the Code regarding  qualification
as a RIC, the Fund will be deemed (i) to own its proportionate share of each of
the assets of the  Portfolio and (ii) to be entitled to the gross income of the
Portfolio attributable to such share.

The Fund will be subject to a 4%  non-deductible  federal excise tax on certain
amounts  not  distributed  (and not treated as having  been  distributed)  on a
timely basis in accordance with annual minimum distribution  requirements.  The
Fund intends under normal circumstances to seek to avoid liability for such tax
by satisfying such distribution  requirements.  Certain  distributions  made in
order to satisfy the Code's  distribution  requirements  may be declared by the
Fund  during  October,  November  or  December  but paid  during the  following
January.  Such  distributions  will be taxable to  taxable  shareholders  as if
received on December 31 of the year the distributions are declared, rather than
the year in which the distributions are received.

At the  discretion of the officers of the Fund,  the Fund will  distribute  net
realized capital gains. For federal income tax purposes,  the Fund is permitted
to carry  forward a net capital  loss in any year to offset its own net capital
gains,  if any,  during the eight years  following the year of the loss. To the
extent  subsequent net capital gains are offset by such losses,  they would not
result in federal  income tax liability to the Fund and, as noted above,  would
not be distributed as such to shareholders.

If the Portfolio invests in zero coupon securities,  certain increasing rate or
deferred interest securities or, in general,  other securities with an original
issue discount (or with market  discount if an election is in effect to include
market discount in income currently),  the Portfolio must accrue income on such
investments prior to the receipt of the corresponding  cash payments.  However,
the Fund must distribute,  at least annually,  all or substantially  all of its
net income,  including  its  distributive  share of such income  accrued by the
Portfolio,  to shareholders to qualify as a regulated  investment company under
the Code and avoid federal  income and excise taxes.  Therefore,  the Portfolio
may  have  to  dispose  of  its  portfolio  securities  under   disadvantageous
circumstances to generate cash, or may have to leverage itself by borrowing the
cash, to enable the Fund to satisfy the distribution requirements.

                                      13

<PAGE>

Distributions  from the Fund's  current or  accumulated  earnings  and  profits
("E&P"),  as  computed  for  Federal  income tax  purposes,  will be taxable as
described in the Prospectus whether taken in shares or in cash.  Distributions,
if any, in excess of E&P will constitute a return of capital,  which will first
reduce an investor's tax basis in Fund shares and thereafter  (after such basis
is reduced to zero) will  generally  give rise to capital  gains.  Shareholders
electing to receive  distributions in the form of additional shares will have a
cost basis for federal  income tax purposes in each share so received  equal to
the amount of cash they would have  received  had they  elected to receive  the
distributions in cash, divided by the number of shares received. As a result of
the enactment of the Taxpayer  Relief Act of 1997 (the "1997 TRA") on August 5,
1997,  gain  recognized  after May 6, 1997 from the sale of a capital  asset is
taxable to individual  (noncorporate)  investors at different  maximum  federal
income tax  rates,  depending  generally  upon the tax  holding  period for the
asset, the federal income tax bracket of the taxpayer,  and the dates the asset
was acquired and/or sold. The Treasury Department has issued guidance under the
1997 TRA that (subject to possible modification by any "technical  corrections"
that may be enacted) will enable the Fund to pass through to their shareholders
the  benefits  of the  capital  gains  tax  rates  contained  in the 1997  TRA.
Shareholders  should consult their own tax advisers on the correct  application
of these new rules in their particular circumstances.

It is anticipated  that, due to the nature of the Portfolio's  investments,  no
portion of the Fund's  distributions  will generally  qualify for the dividends
received  deduction.  The Fund's  distributions  to its corporate  shareholders
would potentially  qualify in their hands for the corporate  dividends received
deduction,  subject to certain holding period  requirements  and limitations on
debt  financing  under  the Code,  only to the  extent  the Fund was  allocated
dividend  income of the  Portfolio  from  stock  investments  in U.S.  domestic
corporations.

Dividends   and  certain  other   distributions   may  be  subject  to  "backup
withholding" of federal income tax at a 31% rate for  shareholders  who fail to
provide required  taxpayer  identification  numbers or related  certifications,
provide incorrect information, or are otherwise subject to such withholding.

Different tax treatment,  including  penalties on certain excess  contributions
and deferrals,  certain  pre-retirement and  post-retirement  distributions and
certain  prohibited  transactions,   is  accorded  to  accounts  maintained  as
qualified  retirement plans.  Shareholders should consult their tax adviser for
more information.

The  foregoing  discussion  relates  solely to U.S.  Federal  income tax law as
applicable to U.S. persons (i.e.,  U.S. citizens or residents and U.S. domestic
corporations,  partnerships,  trusts or estates) subject to tax under such law.
The  discussion  does not address  special tax rules  applicable to any foreign
investors  (who may be subject to  withholding or other taxes) or certain other
classes of investors,  such as tax-exempt entities,  insurance  companies,  and
financial institutions. Dividends, capital gain distributions, and ownership of
or gains realized on the redemption  (including an exchange) of Fund shares may
also be subject to state and local taxes.  A state income (and  possibly  local
income and/or intangible  property) tax exemption is generally available to the
extent,  if any, the Fund's  distributions are derived from interest on (or, in
the case of intangible  property taxes, the value of its assets is attributable
to) investments in certain U.S. Government Securities,  provided in some states
that certain  thresholds  for  holdings of such  obligations  and/or  reporting
requirements  are  satisfied.  Shareholders  should  consult their tax advisers
regarding the applicable requirements in their particular states, including the
effect, if any, of the Fund's indirect ownership (through the Portfolio) of any
such obligations,  the Federal,  and any other state or local, tax consequences
of ownership of shares of, and receipt of distributions from, the Fund in their
particular circumstances.

                                      14


<PAGE>

                        CALCULATION OF PERFORMANCE DATA

From time to time,  the Fund may quote its  "yield"  and  "effective  yield" in
advertisements,  reports and other  communications  to shareholders and compare
its  performance  figures  to those of other  funds or  accounts  with  similar
objectives  and to  relevant  indices.  Such  performance  information  will be
calculated as described  below.  Yield  quotations  are expressed in annualized
terms and may be quoted on a compounded basis.

YIELD

The current yield for the Fund is computed by (a) determining the net change in
the value of a hypothetical  pre-existing  account in the Fund having a balance
of one share at the beginning of a seven calendar day period for which yield is
to be quoted;  (b)  dividing  the net change by the value of the account at the
beginning of the period to obtain the base period return;  and (c)  annualizing
the results (i.e., multiplying the base period return by 365/7).

EFFECTIVE YIELD

In addition,  the Fund may calculate a compound  effective  annualized yield by
determining the net change in the value of a hypothetical  pre-existing account
in the Fund having a balance of one share at the beginning of a seven  calendar
day period for which yield is to be quoted according to the following formula:

    Effective Yield = [( Base Period return +1 ) (365/7 exponentional power)] -
    1 (I.E.,  adding 1 to the  base  period  return  (calculated  as  described
    above), raising the sum to a power equal to 365/7 and subtracting 1.)

The net change in the value of the  account  reflects  the value of  additional
shares,   but  does  not  include  realized  gains  and  losses  or  unrealized
appreciation and depreciation.

                             INDEPENDENT AUDITORS

Ernst & Young  LLP  serves  as the  independent  auditors  to the Trust and the
Portfolio Trust.

                                    COUNSEL

Goodwin,  Procter & Hoar LLP serves as  counsel to the Trust and the  Portfolio
Trust.

                                      15

<PAGE>

                                   APPENDIX

DESCRIPTION OF LONG-TERM DEBT RATINGS

The following is a description of Moody's  Investors  Service  ("Moody's") debt
instrument ratings:

Aaa -- Bonds  which are rated Aaa are  judged to be of the best  quality.  They
carry the smallest degree of investment  risk and are generally  referred to as
"gilt edged". Interest payments are protected by a large or by an exceptionally
stable margin and principal is secure.  While the various  protective  elements
are likely to change,  such changes as can be  visualized  are most unlikely to
impair the fundamentally strong position of such issues.

Aa --  Bonds  which  are  rated  Aa are  judged  to be of high  quality  by all
standards.  Together with the Aaa group they comprise what are generally  known
as high-grade  bonds.  They are rated lower than the best bonds because margins
of  protection  may not be as  large as in Aaa  securities  or  fluctuation  of
protective  elements may be of greater amplitude or there may be other elements
present  which make the  long-term  risk  appear  somewhat  larger than the Aaa
securities.

Moody's  applies  numerical  modifiers  1,  2  and  3 in  each  generic  rating
classification.  The  modifier 1  indicates  that the  obligation  ranks in the
higher end of its generic rating category;  the modifier 2 indicates a midrange
ranking;  and the  modifier  3  indicates  a  ranking  in the lower end of that
generic rating category.

The following is a description of Standard & Poor's Ratings Service  ("Standard
& Poor's"), debt instrument ratings:

Standard & Poor's  ratings  are based,  in varying  degrees,  on the  following
considerations:  (i) the  likelihood of default -- capacity and  willingness of
the obligor as to the timely  payment of interest and repayment of principal in
accordance with the terms of the obligations; (ii) the nature of and provisions
of the obligation;  and (iii) the protection afforded by, and relative position
of,  the  obligation  in the  event  of  bankruptcy,  reorganization,  or other
arrangement  under the laws of bankruptcy and other laws  affecting  creditors'
rights.

AAA -- Debt rated AAA has the  highest  rating  assigned  by Standard & Poor's.
Capacity to pay interest and repay principal is extremely strong.

AA -- Debt  rated AA has a very  strong  capacity  to pay  interest  and  repay
principal and differs from the highest rated issues only in small degree.

Plus (+) or minus (-): The ratings may be modified by the addition of a plus or
minus sign to show relative standing within the major rating categories.

THOMSON BANK WATCH SHORT-TERM DEBT RATINGS

Thomson Bank Watch  ratings  represent an  assessment  of the  likelihood of an
untimely  payment  of  principal  and  interest.  Important  factors  that  may
influence this  assessment are the overall  financial  health of the particular
company,  and the  probability  that the  government  will come to the aid of a

                                      16

<PAGE>

troubled institution in order to avoid a default or failure. The probability of
government intervention stems from four primary factors:

O  Government Guarantees

O  Government Or Quasi-Government Ownership Or Control

O  The Degree Of Concentration In The Banking System

O  Government Precedent

As with the Issuer  Ratings,  the  Short-Term  Debt  Ratings  incorporate  both
qualitative  and  quantitative  factors.  The  ratings  are  not  meant  to  be
"pass/fail"  but rather to provide a relative  indication of  creditworthiness.
Therefore, obligations rated TBW-3 are still considered investment-grade.

These  Short-Term  Debt  Ratings  can  also be  restricted  to  local  currency
instruments.  In such cases, the ratings will be preceded by the designation LC
for Local  Currency.  Short-Term  Debt Ratings are based on the following scale
and the definitions are:

TBW-1                                                                      LC-1
       The highest  category;  indicates a very high  likelihood that principal
       and interest will be paid on a timely basis.

TBW-2                                                                      LC-2
       The second-highest category; while the degree of safety regarding timely
       repayment of principal  and interest is strong,  the relative  degree of
       safety is not as high as for issues rated TBW-1.

TBW-3                                                                      LC-3 
       The  lowest   investment-grade   category;   indicates  that  while  the
       obligation is more  susceptible to adverse  developments  (both internal
       and external)  than those with higher  ratings,  the capacity to service
       principal and interest in a timely fashion is considered adequate.

TBW-4                                                                      LC-4
       The lowest rating  category;  this rating is regarded as  non-investment
       grade and therefore speculative.

THOMSON BANK WATCH LONG-TERM DEBT RATINGS

Long-Term  Debt  Ratings  assigned  by Thomson  Bank  Watch also weigh  heavily
government  ownership and support. The quality of both the company's management
and  franchise  are of even greater  importance  in the  Long-Term  Debt Rating
decisions.  Long-Term  Debt  Ratings look out over a cycle and are not adjusted
frequently for what is believed to be short-term performance aberrations.

Long-Term  Debt Ratings can be restricted to local currency debt - ratings will
be identified by the  designation  LC. In addition,  Long-Term Debt Ratings may
include a plus (+) or minus (-) to indicate where within the category the issue
is placed. Thomson Bank Watch Long-Term Debt Ratings are based on the following
scale:

                                      17


<PAGE>

INVESTMENT GRADE

AAA                                                                      LC-AAA
       Indicates  that the ability to repay  principal and interest on a timely
       basis is extremely high.

AA                                                                        LC-AA
       Indicates a very strong  ability to repay  principal  and  interest on a
       timely basis,  within limited  incremental risk compared to issues rated
       in the highest category.

A                                                                          LC-A
       Indicates the ability to repay principal and interest is strong.  Issues
       rated A could be more vulnerable to adverse  developments (both internal
       and external) than obligations with higher ratings.

BBB                                                                      LC-BBB
       The lowest investment-grade  category;  indicates an acceptable capacity
       to repay  principal  and  interest.  BBB issues are more  vulnerable  to
       adverse  developments (both internal and external) than obligations with
       higher ratings.

Non-Investment grade - may be speculative in the likelihood of timely repayment
of principal and interest.

BB                                                                        LC-BB
       While not investment  grade,  the BB rating suggests that the likelihood
       of default is considerably  less than for lower-rated  issues.  However,
       there are  significant  uncertainties  that could  affect the ability to
       adequately service debt obligations.

B                                                                          LC-B
       Issues rated B show a higher degree of uncertainty and therefore greater
       likelihood of default than  higher-rated  issues.  Adverse  developments
       could  negatively  affect the payment of  interest  and  principal  on a
       timely basis.

CCC                                                                      LC-CCC
       Issues rated CCC clearly have a high likelihood of default,  with little
       capacity to address further adverse changes in financial circumstances.

CC                                                                        LC-CC
       CC is applied to issues that are subordinate to other  obligations rated
       CCC and are  afforded  less  protection  in the event of  bankruptcy  or
       reorganization.

D                                                                          LC-D
        Default







                                      18

<PAGE>

                                     PART C

ITEM 23. EXHIBITS:

(a)  (1)  Master Trust Agreement, effective as of March 30, 1998(1)
     (2)  Amendment No. 1 to the Master Trust Agreement(3)
     (3)  Amendment No. 2 to the Master Trust Agreement
    
(b)  By-Laws(1)

(c)  Not Applicable

(d)  (1)  Investment Adviser Agreement between Merrimac Master Portfolio and
          Investors Bank & Trust Company ("Investors Bank")(Cash Portfolio)(1)

     (2)  Investment Adviser Agreement between Standish, Ayer & Wood Master 
          Portfolio and Standish, Ayer and Wood, Inc. ("Standish")(STAR
          Portfolio)(1)

     (3)  Investment Adviser Agreement between Merrimac Master Portfolio and
          Investors Bank (Treasury Portfolio)(3)

     (4)  Investment Adviser Agreement between Merrimac Master Portfolio and
          Investors Bank (Treasury Plus Portfolio)(4)

     (5)  Form of Investment Adviser Agreement between Merrimac Master
          Portfolio and Investors Bank (U.S. Government Portfolio)

     (6)  Investment Sub-Adviser Agreement between Investors Bank and Allmerica
          Asset Management, Inc. (Cash Portfolio)(3)

     (7)  Investment Sub-Adviser Agreement between Investors Bank and M&I 
          Investment Management Corp. (Treasury Portfolio)(4)

     (8)  Investment Sub-Adviser Agreement between Investors Bank and M&I
          Investment Management Corp. (Treasury Plus Portfolio)(4)

     (9)  Form of Investment Sub-Adviser Agreement between Investors Bank and
          Allmerica Asset Management, Inc. (U.S. Government Portfolio)

(e)  Distribution Agreement between Registrant and Funds Distributor Inc.
     ("Funds Distributor")(3)

(f)  Not Applicable

(g)  Custodian Agreement between Registrant and Investors Bank(3)

(h)  (1)  Administration Agreement between Registrant and Investors Bank(3)

     (2)  Transfer Agency and Service Agreement between Registrant and
          Investors Bank(2)

     (3)  Third Party Feeder Fund Agreement among Registrant, Standish, Ayer &
          Wood Master Portfolio, Investors Bank and Standish(4)

     (4)  Agreement between Funds Distributor and Investors Bank(2)

(i)  (1)  Opinion of Counsel(2)

     (2)  Opinion of Counsel(3)

     (3)  Opinion of Counsel

(j)  Not Applicable

<PAGE>

(k)  Not Applicable

(l)  Purchase Agreement(2)

(m) (1)  Shareholder Servicing Plan with respect to Institutional Class
         Shares(2)

    (2)  Shareholder Servicing Plan with respect to Investment Class Shares(2)

    (3)  Shareholder Servicing Agreement with respect to Institutional Class
         Shares(2)

    (4)  Form of Shareholder Servicing Agreement with respect to Investment
         Class Shares(1)

    (5)  Distribution Plan with respect to Investment Class Shares(2)

(n)  None

(o)  Multiple Class Expense Allocation Plan (Rule 18f-3)(2)

(1)  Incorporated herein by reference to the Registrant's Registration
     Statement on Form N-1A filed April 8, 1998 (Accession No. 0001029869-98-
     000483).

(2)  Incorporated herein by reference to the Registrant's Pre-Effective
     Amendment No. 1 to the Registration Statement on Form N-1A filed June 18,
     1998 (Accession No. 0001029869-98-000820).

(3)  Incorporated herein by reference to the Registrant's Post-Effective
     Amendment No. 1 to the Registration Statement on Form N-1A filed October
     30, 1998 (Accession No. 0001029869-98-001219).

(4)  Incorporated herein by reference to the Registrant's Post-Effective
     Amendment No. 2 to the Registration Statement on Form N-1A filed February
     25, 1999 (Accession No. 0000897436-99-000033).


ITEM 24.  PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH THE TRUST.

A list of all persons  directly or  indirectly  under  common  control with the
Registrant which indicates  principal  business of each such company referenced
is incorporated herein by reference to Item 25 of the Registration Statement on
Form N-1A (File No. 811-07941), as filed electronically with the Securities and
Exchange Commission on March 28, 1997.

ITEM 25.  INDEMNIFICATION.

Under Article VI, Section 6.4 of the Registrant's Master Trust Agreement to the
fullest extent  permitted by law, the Trust shall indemnify (from the assets of
the  Sub-Trust or  Sub-Trusts  in  question)  each of its Trustees and officers
(including  persons who serve at the Trust's request as directors,  officers or
trustees  of  another  organization  in which the Trust has any  interest  as a
shareholder,  creditor  or  otherwise  [hereinafter  referred  to as a "Covered
Person"]) against all liabilities, including but not limited to amounts paid in
satisfaction  of  judgments,  in  compromise  or as fines  and  penalties,  and
expenses,  including reasonable  accountants' and counsel fees,

<PAGE>

incurred by any Covered Person in connection with the defense or disposition of
any action,  suit or other  proceeding,  whether civil or criminal,  before any
court or  administrative  body, in which such Covered Person may be or may have
been  involved as a party or  otherwise or with which such person may be or may
have been  threatened,  while in office  or  thereafter,  by reason of being or
having been such a Trustee or officer, director or trustee, except with respect
to any matter as to which it has been  determined  that such Covered Person had
acted  with  willful  misfeasance,  bad faith,  gross  negligence  or  reckless
disregard of the duties involved in the conduct of such Covered Person's office
(such conduct  referred to hereafter as "Disabling  Conduct").  A determination
that the Covered  Person is entitled  to  indemnification  may be made by (i) a
final  decision  on the  merits  by a court  or  other  body  before  whom  the
proceeding  was  brought  that the person to be  indemnified  was not liable by
reason  of  Disabling  Conduct,   (ii)  dismissal  of  a  court  action  or  an
administrative  proceeding  against  a  Covered  Person  for  insufficiency  of
evidence of Disabling Conduct, or (iii) a reasonable determination,  based upon
a review of the  facts,  that the  Covered  Person  was not liable by reason of
Disabling  Conduct by (a) a vote of a majority of a quorum of Trustees  who are
neither "interested persons" of the Trust as defined in Section 2(a)(19) of the
1940 Act nor parties to the proceeding,  or (b) an independent legal counsel in
a  written  opinion.  Expenses,  including  accountants'  and  counsel  fees so
incurred by any such Covered Person (but excluding amounts paid in satisfaction
of judgments, in compromise or as fines or penalties), may be paid from time to
time from funds  attributable  to the  Sub-Trust  in question in advance of the
final  disposition of any such action,  suit or  proceeding,  provided that the
Covered  Person  shall  have  undertaken  to repay the  amounts  so paid to the
Sub-Trust in question if it is ultimately  determined that  indemnification  of
such  expenses  is not  authorized  under this  Article VI and (i) the  Covered
Person shall have provided security for such undertaking,  (ii) the Trust shall
be insured against losses arising by reason of any lawful advances,  or (iii) a
majority of a quorum of the  disinterested  Trustees who are not a party to the
proceeding,  or an independent  legal counsel in a written opinion,  shall have
determined,  based on a review of readily available facts (as opposed to a full
trial-type  inquiry),  that there is reason to believe that the Covered  Person
ultimately will be found entitled to indemnification.

Insofar as  indemnification  for liability  arising under the Securities Act of
1933, as amended (the "1933 Act"),  may be permitted to Trustees,  officers and
controlling  persons of the Trust  pursuant  to the  foregoing  provisions,  or
otherwise,  the Trust has been  advised  that in the opinion of the  Commission
such  indemnification is against public policy as expressed in the 1933 Act and
is,  therefore,  unenforceable.  In the event that a claim for  indemnification
against  such  liabilities  (other  than the  payment by the Trust of  expenses
incurred or paid by a Trustee,  officer or  controlling  person of the Trust in
the successful  defense of any action,  suit or proceeding) is asserted by such
Trustee, officer or controlling person in connection with the securities being
registered, the Trust will, unless in the opinion of its counsel the matter has
been  settled  by  controlling  precedent,  submit  to a court  of  appropriate
jurisdiction the question whether such  indemnification by it is against public
policy  as  expressed  in the  1933  Act and  will  be  governed  by the  final
adjudication of such issue.

<PAGE>

ITEM 26.  BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER.

Investors Bank serves as investment adviser to the Merrimac Cash Portfolio, the
Merrimac Treasury Portfolio and the Merrimac Treasury Plus Portfolio. Investors
Bank was  organized  in 1969 as a  Massachusetts-chartered  trust  company  and
provides domestic and global custody, multi-currency accounting,  institutional
transfer agency, performance measurement, foreign exchange, securities lending,
mutual fund  administration  and investment  advisory  services to a variety of
financial asset managers, including mutual fund complexes, investment advisers,
banks and insurance companies. The business, profession, vocation or employment
of a substantial  nature that each director or officer of Investors  Bank is or
has been, at any time during the past two fiscal years,  engaged in for his own
account or in the capacity of director,  officer, employee, partner or trustee,
is as follows:

                                                       Business and Other
                                                       Positions Within
Name                      Position with Adviser        Last Two Years
- ----                      ---------------------        --------------

Kevin J. Sheehan          President & Chief            President since June
                          Executive Officer            1992;Chief Executive
                                                       Officer since June 1995

Michael F. Rogers         Executive Vice               since September 1993
                          President

Karen C. Keenan           Senior Vice President &      Treasurer since
                          Chief Financial Officer      September 1997; and 
                                                       Treasurer, Senior Vice
                                                       President and Chief
                                                       Financial Officer since
                                                       June 1995

Edmund J. Maroney         Senior Vice President --     since July 1991
                          Technology

Robert D. Mancuso         Senior Vice President --     since September 1993
                          Marketing and Client
                          Services

David F. Flynn            Senior Vice President --     since April 1992
                          Lending

John E. Henry             General Counsel &            since January 1997;
                          Secretary                    General Counsel &
                                                       Assistant Secretary
                                                       since February 1996

James M. Oates            Director                     Chairman of IBEX
                                                       Capital Markets, LLC
                                                       since 1996; Managing
                                                       Director of The Wydown

<PAGE>
     
                                                       Group 1994-1996

Thomas P. McDermott       Director                     Managing Director of
                                                       TPM Associates since
                                                       1994

Frank B. Condon           Director                     Chief Executive
                                                       Officer & Chairman of
                                                       The Woodstock
                                                       Corporation from 1993
                                                       to April 1997

Phyllis S. Swersky        Director                     President of the
                                                       Meltech Group since
                                                       1995; President &
                                                       Chief Executive
                                                       Officer of The NET
                                                       Collaborative from
                                                       1996 to 1997

Donald G. Friedl          Director                     President of All
                                                       Seasons Services from
                                                       1986 to January 1997

Robert B. Fraser          Director                     Retired, Formerly,
                                                       Chairman of Goodwin,
                                                       Procter & Hoar, L.L.P.

ITEM 27.  PRINCIPAL UNDERWRITERS.

     (a) Funds  Distributor  acts as principal  underwriter  for the  following
     investment companies.

        American Century California Tax-Free and Municipal Funds
        American Century Capital Portfolios, Inc.
        American Century Government Income Trust
        American Century International Bond Funds
        American Century Investment Trust
        American Century Municipal Trust
        American Century Mutual Funds, Inc.
        American Century Premium Reserves, Inc.
        American Century Quantitative Equity Funds
        American Century Strategic Asset Allocations, Inc.
        American Century Target Maturities Trust
        American Century Variable Portfolios, Inc.
        American Century World Mutual Funds, Inc.
        The Brinson Funds
        Dresdner RCM Capital Funds, Inc.

<PAGE>

        Dresdner RCM Equity Funds, Inc.
        Harris Insight Funds Trust
        HT Insight Funds, Inc. d/b/a Harris Insight Funds
        J.P. Morgan Institutional Funds
        J.P. Morgan Funds
        JPM Series Trust
        JPM Series Trust II
        Kobrick-Cendant Investment Trust
        LaSalle Partners Funds, Inc.
        Merrimac Series
        Monetta Fund, Inc.
        Monetta Trust
        The Montgomery Funds I
        The Montgomery Funds II
        The Munder Framlington Funds Trust
        The Munder Funds Trust
        The Munder Funds, Inc.
        National Investors Cash Management Fund, Inc.
        Orbitex Group of Funds
        SG Cowen Funds, Inc.
        SG Cowen Income & Growth Fund, Inc.
        SG Cowen Standby Reserve Fund, Inc.
        SG Cowen Standby Tax-Exempt Reserve Fund, Inc.
        SG Cowen Series Funds, Inc.
        St. Clair Funds, Inc.
        The Skyline Funds
        Waterhouse Investors Family of Funds, Inc.
        WEBS Index Fund, Inc.

Funds Distributor is registered with the Securities and Exchange  Commission as
a  broker-dealer  and is a member of the  National  Association  of  Securities
Dealers.  Funds Distributor is located at 60 State Street,  Suite 1300, Boston,
Massachustts 02109. Funds Distributor is an indirect wholly-owned subsidiary of
Boston  Institutional  Group,  Inc., a holding company all of whose outstanding
shares are owned by key employees.

    (b) The following is a list of the executive officers, directors and
    partners of Funds Distributor:

     Director, President and Chief Executive Officer - Marie E. Connolly
     Executive Vice President - George A. Rio
     Executive Vice President - Donald R. Roberson
     Executive Vice President - William S. Nichols
     Senior Vice President, General Counsel, Chief Compliance Officer,
     Secretary and Clerk - Margaret W. Chambers
     Senior Vice President - Michael S. Petrucelli
     Director, Senior Vice President, Treasurer and Chief Financial Officer -
     Joseph F. Tower, III
     Senior Vice President - Paula R. David
     Senior Vice President - Gary S. MacDonald
     Senior Vice President - Judith K. Benson
     Chairman and Director - William J. Nutt

     (c) Not applicable.

<PAGE>

ITEM 28.  LOCATION OF ACCOUNTS AND RECORDS.

The accounts and records of the Registrant are located, in whole or in part, at
the office of the Registrant  and the locations set forth below.  (The Merrimac
Cash Series,  the Merrimac  Treasury Series,  the Merrimac Treasury Plus Series
and the Merrimac U.S.  Government  Series are  collectively  referred to as the
"Funds" and the Merrimac Cash Portfolio,  the Merrimac Treasury Portfolio,  the
Merrimac Treasury Plus Portfolio and the Merrimac U.S. Government Portfolio are
collectively referred to as the "Portfolios").

Investors Bank & Trust Company
200 Clarendon Street
Boston, MA 02116
(Investment  Adviser to the Merrimac  Cash  Portfolio,  the  Merrimac  Treasury
Portfolio,   the  Merrimac  Treasury  Plus  Portfolio  and  the  Merrimac  U.S.
Government Portfolio; Administrator and Transfer Agent for the Funds; Custodian
for the Funds and the Portfolios).

Allmerica Asset Management, Inc.
40 Lincoln Street
Worcester, Massachusetts 01653
(Investment Sub-Adviser to the Merrimac Cash Portfolio and the Merrimac U.S.
Government Portfolio)

M&I Investment Management Corp.
1000 North Water Street
Milwaukee, Wisconsin 53202-6629
(Investment  Sub-Adviser  to the Merrimac  Treasury  Portfolio and the Merrimac
Treasury Plus Portfolio)

IBT Trust & Custodial Services (Ireland) LMTD 
Deloitte & Touche House
29 Earlsfort Terrace
Dublin 2, Ireland
(Administrator to the Portfolios)

IBT Fund Services (Canada) Inc.
1 First Canadian, King Street West
Suite 2800
P.O. Box 231
Toronto, CA M5X1C8
(Transfer  Agent for the Portfolios and Fund  Accountant for the Portfolios and
the Funds)

ITEM 29.  MANAGEMENT SERVICES.

Not applicable.

<PAGE>

ITEM 30.  UNDERTAKINGS.

Not Applicable.

<PAGE>

SIGNATURES

Merrimac  Master  Portfolio  (the  "Portfolio  Trust")  has  duly  caused  this
Post-Effective  Amendment No. 3 to the  Registration  Statement on Form N-1A of
Merrimac  Series  to be  signed  on  behalf  of  the  Portfolio  Trust  by  the
undersigned, thereto duly authorized on the 19th day of March, 1999.

MERRIMAC MASTER PORTFOLIO

By   /s/ PAUL J. JASINSKI
     ---------------------
     Paul J. Jasinski
     President

Pursuant to the  requirements  of the Securities Act of 1933, as amended,  this
Post-Effective  Amendment No. 3 to the  Registration  Statement on Form N-1A of
Merrimac  Series  has  been  signed  below  by  the  following  persons  in the
capacities indicated on the 19th day of March, 1999.

        /s/ PAUL J. JASINSKI
        --------------------
        Paul J. Jasinski
        President, Treasurer and Chief Financial Officer
        of the Portfolio Trust

        /s/ KEVIN J. SHEEHAN*
        ---------------------
        Kevin J. Sheehan
        Trustee of the Portfolio Trust

        /s/ THOMAS E. SINTON*
        ---------------------
        Thomas E. Sinton
        Trustee of the Portfolio Trust

        /s/ FRANCIS J. GAUL, JR.*
        -------------------------
        Francis J. Gaul, Jr.
        Trustee of the Portfolio Trust

        /s/ EDWARD F. HINES, JR.*
        -------------------------
        Edward F. Hines, Jr.
        Trustee of the Portfolio Trust

*By     /s/ SUSAN C. MOSHER
        -------------------
        Susan C. Mosher
        as attorney-in-fact

<PAGE>

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, and the
Investment  Company Act of 1940, as amended,  Merrimac Series (the "Trust") has
duly caused this Post-Effective  Amendment No. 3 to the Registration  Statement
on Form N-1A to be  signed  on its  behalf  by the  undersigned,  thereto  duly
authorized in the City of Boston and  Commonwealth of Massachusetts on the 19th
day of March, 1999.

MERRIMAC SERIES

By   /s/ George A. Rio
     ------------------
     George A. Rio
     President

Pursuant to the  requirements  of the Securities Act of 1933, as amended,  this
Post-Effective  Amendment No. 3 to the  Registration  Statement on Form N-1A of
Merrimac  Series  has  been  signed  below  by  the  following  persons  in the
capacities indicated on the 19th day of March, 1999.

        /s/ George A. Rio
        -----------------
        George A. Rio
        President of the Trust

        /s/ Paul J. Jasinski
        --------------------
        Paul J. Jasinski
        Treasurer and Chief Financial Officer of the Trust

        /s/ Kevin J. Sheehan*
        ---------------------
        Kevin J. Sheehan
        Trustee of the Trust

        /s/ Francis J. Gaul, Jr.*
        -------------------------
        Francis J. Gaul, Jr.
        Trustee of the Trust

        /s/ Edward F. Hines, Jr.*
        -------------------------
        Edward F. Hines, Jr.
        Trustee of the Trust

        /s/ Thomas E. Sinton*
        ---------------------
        Thomas E. Sinton
        Trustee of the Trust

*By     /s/ Susan C. Mosher
        -------------------
        Susan C. Mosher
        as attorney-in-fact

<PAGE>

                                MERRIMAC SERIES

                                 EXHIBIT INDEX

Exhibit No.                   Exhibit                                    Page
- -----------                   -------                                    ----

EX-99.a(3)                    Amendment No. 2 to the Master Trust
                              Agreement

EX-99.d(5)                    Form of Investment Adviser Agreement

EX-99.d(9)                    Form of Investment Sub-Adviser Agreement

EX-99.i(3)                    Opinion of Counsel



                                MERRIMAC SERIES
                               AMENDMENT NO. 2 TO
                             MASTER TRUST AGREEMENT

     AMENDMENT NO. 2 to the Master Trust  Agreement dated March 30, 1998 of the

Merrimac Series (the "Trust") made at Boston, Massachusetts as of this 15th day

of March, 1999.

     WHEREAS,  Section  7.3 of the  Agreement  of the Trust  provides  that the

Agreement may be amended at any time by an  instrument  in writing  signed by a

majority of Trustees of the Trust without the vote of the  Shareholders  of the

Trust,  so long as such amendment  does not adversely  affect the rights of any

shareholder;

     WHEREAS,  Section  4.1 of the  Agreement  of the Trust  provides  that the

Trustees of the Trust may establish and designate  additional  Series of Shares

by an instrument in writing signed by a majority of Trustees of the Trust; and

     WHEREAS,  the  Trustees of the Trust  desire to  establish  an  additional

Series of Shares to be identified as the "Merrimac U.S. Government Series."

     NOW, THEREFORE, the Trustees hereby state that:

     1. Section 4.2 of the  Agreement and all other  appropriate  references in

the Agreement are amended to designate and establish a new Series of shares (in

addition to the  Merrimac  Cash  Series,  the  Merrimac  Treasury  Series,  the

Merrimac Treasury Plus Series, and the Merrimac Short-Term Asset Reserve Series

heretofore  established  and  designated)  to be  known  as the  Merrimac  U.S

Government  Series,  effective  as of this  date,  such new  Series to have the

relative rights and preferences set forth in Section 4.2 of the Agreement.

     2. The initial paragraph of Section 4.2 of the agreement, as heretofore in

effect, is amended to read as follows:

<PAGE>

       "Section 4.2  Establishment  and  Designation  of Sub-Trusts  and
                     ---------------------------------------------------
       Classes. Without limiting the authority of the Trustees set forth
       -------
       in Section 4.1 to establish and designate any further Sub-Trusts,
       the Trustees  hereby  establish  and  designate  five  Sub-Trusts
       identified as "Merrimac Cash Series," "Merrimac Treasury Series,"
       "Merrimac  Treasury  Plus  Series,"  "Merrimac  U.S.   Government
       Series" and "Merrimac  Short-Term  Asset Reserve  Series,"  which
       Sub-Trusts shall consist of three classes of shares identified as
       the "Premium  Class" the  "Institutional  Class" and  "Investment
       Class"  Shares.  The Shares of such  Sub-Trusts and any Shares of
       any further  Sub-Trusts that may from time to time be established
       and  designated  by  the  Trustees  shall  (unless  the  Trustees
       otherwise determine with respect to some further Sub-Trust at the
       time of establishing and designating the same) have the following
       relative rights and preferences:"

     IN WITNESS WHEREOF, the undersigned have hereunto set their hands and seal
for themselves and their assigns, as of this 15th day of March, 1999.



                     /s/ Edward F. Hines, Jr.
     ------------------------------------------
                         Edward F. Hines, Jr.



                     /s/ Francis J. Gaul, Jr.
     ------------------------------------------ 
                         Francis J. Gaul, Jr.


                                               
                     
     ------------------------------------------
                         Thomas E. Sinton



                     /s/ Kevin J. Sheehan
     ------------------------------------------
                         Kevin J. Sheehan



                         INVESTMENT ADVISER AGREEMENT



        Agreement  made  as of this  ___  day of  June,  1999,  by and  between
Merrimac  Master  Portfolio,  a New York Trust (the "Trust") and Investors Bank
and Trust Company (the "Adviser"), a Massachusetts banking corporation.

        WHEREAS,  the MERRIMAC U.S. GOVERNMENT PORTFOLIO (the "Portfolio") is a
series of the Trust,  which is an open-end  diversified  management  investment
company  registered as such with the  Securities and Exchange  Commission  (the
"SEC")  pursuant to the  Investment  Company Act of 1940, as amended (the "1940
Act");

        WHEREAS, the Merrimac U.S. Government Series (the "Fund"),  which is an
open-end diversified  management investment company registered as such with the
SEC pursuant to the 1940 Act and the Securities Act of 1933, will invest all of
its investable assets in the Portfolio;

        WHEREAS, the Trust, on behalf of the Portfolio,  desires to appoint the
Adviser to render,  or contract to obtain as hereinafter  provided,  investment
advisory services to the Portfolio and to administer the Portfolio's day to day
business  affairs and the Adviser is willing to act in such  capacity  upon the
terms herein set forth;

        NOW  THEREFORE,  in  consideration  of the  premises  and of the mutual
covenants  herein  contained,  the Trust,  on behalf of the Portfolio,  and the
Adviser,  the parties  hereto,  intending to be legally bound,  hereby agree as
follows:

1.  Appointment

        (a) The Trust, on behalf of the Portfolio,  hereby appoints the Adviser
as the investment  adviser of the Portfolio to administer its business  affairs
and to perform  for the  Portfolio  such  other  duties  and  functions  as are
hereinafter set forth.  The Adviser hereby accepts such  appointment and agrees
to give the Portfolio and the Trust's Board of Trustees (the  "Trustees"),  the
benefit of the Adviser's best judgment,  effort,  advice and recommendations in
respect of its duties as defined in Section 2.

        (b) The Trust hereby  represents  and  warrants to the  Adviser,  which
representations  and warranties  shall be deemed to be continuing,  that (i) it
has full  power and  authority  to enter into this  Agreement,  and (ii) it has
taken all  necessary  and proper action to authorize the execution and delivery
of this Agreement.

        (c) The Adviser  hereby  represents  and  warrants to the Trust,  which
representations  and warranties  shall be deemed to be continuing,  that (i) it
has full  power and  authority  to enter into this  Agreement,  and (ii) it has
taken all  necessary  and proper action to authorize the execution and delivery
of this Agreement.

2.  Adviser Duties

        (a) The  Adviser  shall,  subject to the  direction  and control of the
Trustees and in accordance with the objective and policies of the Portfolio and
the implementation  thereof as set forth in the Fund's Prospectus and Statement
of Additional  Information ("SAI"), the Portfolio's  Registration  Statement on
Form N-1A and any federal  and state laws:  (i)  regularly  provide  investment
advice and  recommendations  to the Portfolio,  with respect to the Portfolio's
investments,  investment policies and the purchase and sale of securities; (ii)
supervise and monitor  continuously the investment program of the Portfolio and
the  composition  of its  portfolio  and  determine  what  securities  shall be
purchased and sold by the Portfolio; (iii) arrange, subject to the provision of
Section 4 hereof,  for the purchase of securities and other investments for the
Portfolio and the sale of securities  and other  investments  of the Portfolio;
(iv) provide  reports on the

                                       1

<PAGE>

foregoing  to the Trust in such detail as the Trust may  reasonably  deem to be
appropriate  in order to permit the Trust to  determine  the  adherence  by the
Adviser to the investment policies and legal requirements of the Portfolio; and
(v) make its  officers  and  employees  available  to the  Trust's  officers at
reasonable  times to review the  investment  policies of the  Portfolio  and to
consult  with the Trust's  officers  regarding  the  investment  affairs of the
Portfolio.

        (b) The  Adviser is  further  authorized  to enter  into a  sub-adviser
arrangement for the investment  advisory  services outlined in Section 2 (a) of
this Agreement in connection  with the  management of the  Portfolio,  provided
that no such arrangement  shall be made until a sub-adviser  agreement has been
approved  by the  Trustees.  Should the Adviser  enter into such a  sub-adviser
agreement, the Adviser shall,  nevertheless,  retain supervisory responsibility
for  all  investment   advisory  services   furnished   pursuant  to  any  such
sub-advisory  arrangements  and the Adviser's  duties shall then  include:  (i)
supervise and monitor  continuously the investment  advisory services furnished
pursuant to any such sub-adviser  arrangements;  (ii) review the performance of
the sub-adviser,  and make  recommendations to the Trustees with respect to the
retention and renewal of such sub-adviser  arrangements;  (iii) provide reports
on the foregoing to the Trustees for each Board meeting; (iv) make its officers
and employees  available to review the investment policies of the Portfolio and
to  consult  with the  sub-adviser  regarding  the  investment  affairs  of the
Portfolio;  (v) supervise relationships with and monitor the performance of the
custodian, depositories,  transfer agent, accountants,  attorneys, insurers and
other  persons in any capacity  deemed to be necessary or  desirable;  and (vi)
make  recommendations  to the Trustees  with respect to Portfolio  policies and
carry out such policies as are adopted by the Trustees.

3. Compensation of the Adviser

        The Portfolio will pay to the Adviser as compensation for the Adviser's
services  rendered  and  for  the  expenses  borne  by the  Adviser,  including
personnel  expenses,  a fee,  determined  as  described  in Schedule A which is
attached hereto and made a part hereof.
  
4.  Portfolio Transactions and Brokerage

        The  Adviser  shall  place  all  orders  for the  purchase  and sale of
portfolio  securities  for the  Portfolio's  account with  issuers,  brokers or
dealers selected by the Adviser,  which may include where permissible under the
1940 Act, brokers or dealers  affiliated with the Adviser.  In the selection of
such  brokers or dealers and the  placing of such  orders,  the Adviser  always
shall seek best execution,  which is to place  transactions where the Portfolio
can obtain the most favorable  combination  of price and execution  services in
particular  transactions  or  provided  on a  continuing  basis by a broker  or
dealer,  and to deal  directly  with a  principal  market  in  connection  with
over-the-counter  transactions,  except when it is believed that best execution
is obtainable elsewhere.

5.  Interested Trustees or Parties

        It is understood that Trustees, officers, and shareholders of the Trust
may be or become interested in the Adviser as directors,  officers or employees
and that directors,  officers and  stockholders of the Adviser may be or become
similarly  interested  in the  Trust,  and that the  Adviser  may be or  become
interested in the Trust as a shareholder or otherwise.

6.  Services Not Exclusive

        The  services  of the  Adviser  to the  Portfolio  are not to be deemed
exclusive,  the Adviser  being free to render  services to others and engage in
other activities, provided, however, that such other services and activities do
not, during the term of this Agreement,  interfere,  in a material manner, with
the Adviser's ability to meet all of its obligations hereunder.

                                       2

<PAGE>

7.  Compliance; Books and Records

        (a) The Adviser agrees to maintain  adequate  compliance  procedures to
ensure its compliance  with the  applicable  provisions of the 1940 Act and any
rules  or  regulations  thereunder,  the  investment  objective,  policies  and
restrictions  of the Portfolio as set forth in the current Fund  Prospectus and
SAI and any other applicable provisions of state or federal law.

        (b) The Adviser  shall  furnish to the  Portfolio,  at the  Portfolio's
expense,  copies of all records  prepared in connection with the performance of
this Agreement and the  maintenance of compliance  procedures  pursuant to this
Section 7 as the Portfolio may reasonably request.

        (c) The  Adviser  agrees to  provide  upon  reasonable  request  of the
Portfolio,  information  regarding  the Adviser,  including but not limited to,
background  information  about  the  Adviser  and  its  personnel,  for  use in
connection with efforts to promote the Fund and the sale of its shares.

        (d) In compliance  with the  requirements  of Rule 31a-3 under the 1940
Act, the Adviser  hereby  agrees that all records  which it  maintains  for the
Trust are the property of the Trust and further agrees to surrender promptly to
the Trust any of such records  upon the Trust's  request.  The Adviser  further
agrees to preserve for the periods  prescribed by Rule 31a-2 under the 1940 Act
the records  required to be  maintained  by Rule 31a-1 under the 1940 Act.  The
Adviser will treat  confidentially and as proprietary  information of the Trust
all records and other  information  relative to the Fund and prior,  present or
potential shareholders, except as otherwise required by law.

8.  Limitation of Liability of Adviser

        In  consideration  of the Adviser's  undertaking to render the services
described in this Agreement, the Trust, on behalf of the Portfolio, agrees that
the Adviser  shall not be liable under this  Agreement for any loss suffered by
the Trust in connection with the  performance of this Agreement,  provided that
nothing in this Agreement  shall be deemed to protect or purport to protect the
Adviser  against any  liability to the Trust or its  shareholders  to which the
Adviser would otherwise be subject by reason of willful misfeasance,  bad faith
or negligence in the performance of its duties under this Agreement.

9.  Duration, Amendment and Termination

        (a) Subject to prior termination as provided in sub-section (d) of this
Section 9, this  Agreement  shall  continue in effect  until two years from the
date hereof and for successive annual periods  thereafter,  but only so long as
the  continuance  after such  initial  two year  period  shall be  specifically
approved at least  annually by vote of the Trustees or by vote of a majority of
the outstanding voting securities of the Portfolio and the Fund.

        (b) This  Agreement  may be modified by the  written  Agreement  of the
Adviser and the  Portfolio,  such  consent on the part of the  Portfolio  to be
authorized by vote of a majority of the  outstanding  voting  securities of the
Portfolio  and  the  Fund  if  required  by  law.  The  execution  of any  such
modification  or amendment by a party shall  constitute  a  representation  and
warranty  to the other party that all  necessary  consents  or  approvals  with
respect to such modification or amendment have been obtained.

        (c) In addition to the requirements of sub-sections (a) and (b) of this
Section 9, the terms of any  continuance or  modification of the Agreement must
have been  approved  by the vote of a majority  of those  Trustees  who are not
parties to such  Agreement  or  interested  persons of any such party,  cast in
person at a meeting called for the purpose of voting on such approval.

        (d) Either the Adviser or the Portfolio  may, at any time on sixty (60)
days'  prior  written  notice to the other  party,  terminate  this  Agreement,
without payment of any penalty, and in the case of the Portfolio,  by action of
its Trustees, or by vote of a majority of its outstanding voting securities.

                                       3

<PAGE>

        (e) This Agreement  shall terminate  automatically  in the event of its
assignment.

        (f) Termination of this Agreement shall not relieve the Adviser nor the
Trust from any liability or obligation in respect of any matters,  undertakings
or conditions  which shall not have been done,  observed or performed  prior to
such termination. All records of the Portfolio in the possession of the Adviser
shall be returned to the Portfolio as soon as reasonably  practicable after the
termination of this Agreement.

10.  Disclaimer of Liability; Several Obligations

        The Adviser  understands  that the  obligations of the Trust under this
Agreement  are not  binding  upon  any  Trustee  or  shareholder  of the  Trust
personally, but bind only the Trust and the Trust's property.

        This Agreement is an agreement entered into between the Adviser and the
Trust on behalf of the  Portfolio.  With respect to any obligation of the Trust
on behalf of any other  Portfolio  arising out of this  Agreement,  the Adviser
shall look for payment or satisfaction of such obligation  solely to the assets
of the  Portfolio  to which such  obligation  relates as though the Adviser had
separately  contracted  with the  Trust by  separate  written  instrument  with
respect to each Portfolio.

11.  Miscellaneous

        (a)  The  terms  "vote  of  a  majority  of  the   outstanding   voting
securities,"  "assignment," and "interested  persons," when used herein,  shall
have the respective  meanings  specified in the 1940 Act as now in effect or as
hereafter amended.

        (b) The captions in this  Agreement  are included  for  convenience  of
reference only and in no way define or delimit any of the provisions  hereof or
otherwise affect their construction or effect.

        (c) If any provision of this Agreement shall be held or made invalid by
a court decision,  statute, rule or otherwise,  the remainder of this Agreement
shall not be affected thereby.

        (d) This  Agreement  shall be  binding  upon and  shall  insure  to the
benefit of the parties hereto and their respective successors.

        (e) The  Adviser's  duties and  responsibilities  are solely  those set
forth herein and no other covenant or obligation  shall be implied  against the
Adviser in connection with this Agreement.

        (f) This Agreement may be executed in two or more  counterparts,  which
taken together shall constitute one and the same instrument.

        (g) Any notice under this Agreement shall be in writing,  addressed and
delivered  or mailed,  postage  prepaid,  to the other party at such address as
such other party may designate for the receipt of such notice.  No notice shall
be effective until received.

        IN WITNESS  WHEREOF,  the parties  have caused  this  instrument  to be
executed by their respective  officers  designated below as of the day and year
first above written.





                                       4


<PAGE>

                           Merrimac Master Portfolio ("TRUST") on behalf of 
                           the Merrimac U.S. Government Portfolio ("PORTFOLIO")


                           By:  
                               -------------------------------
                                   Paul J. Jasinski

                           Title: President
                                  ---------



                           INVESTORS BANK & TRUST COMPANY
                           ("ADVISER")

                           By:  
                               -------------------------------
                                   Kevin J. Sheehan

                           Title: President and Chief Executive Officer
                                  -------------------------------------

















                                       5
                   


                       INVESTMENT SUB-ADVISER AGREEMENT


Agreement  made as of this ___ day of June,  1999,  between  Investors Bank and
Trust  Company  (the  "Adviser"),  a  Massachusetts  banking  corporation,  and
Allmerica  Asset  Management,   Inc.  (the   "Sub-Adviser"),   a  Massachusetts
corporation.

WHEREAS,  Merrimac U.S.  Government  Portfolio (the "Portfolio") is a series of
the Merrimac Master Portfolio (the "Trust"),  which is an open-end  diversified
management  investment  company  registered  as such  with the  Securities  and
Exchange Commission (the "SEC") pursuant to the Investment Company Act of 1940,
as amended (the "1940  Act"),  and the Trust has  appointed  the Adviser as the
investment  adviser for the  Portfolio,  pursuant to the terms of an Investment
Adviser Agreement (the "Adviser Agreement"); and

WHEREAS,  the  Merrimac  U.S.  Government  Series (the  "Series"),  an open-end
diversified  management  investment  company  registered  as such  with the SEC
pursuant to the 1940 Act and the  Securities Act of 1933, as amended (the "1933
Act") will invest all of its investable assets in the Portfolio; and

WHEREAS,  the Adviser  Agreement  provides that the Adviser may, at its option,
subject to approval by the Trustees of the Trust and, to the extent  necessary,
shareholders  of  the  Portfolio,  appoint  a  sub-adviser  to  assume  certain
responsibilities  and  obligations of the Adviser under the Adviser  Agreement;
and

WHEREAS,  the Adviser desires to appoint the Sub-Adviser as its sub-adviser for
the Portfolio and the  Sub-Adviser  is willing to act in such capacity upon the
terms herein set forth; and

NOW THEREFORE,  in  consideration  of the premises and of the mutual  covenants
herein  contained,  the  Adviser  and  the  Sub-Adviser,  the  parties  hereto,
intending to be legally bound, hereby agree as follows:

1.  Appointment
- --------------- 

          (a) The Adviser  hereby  appoints the  Sub-Adviser  as the investment
          sub-adviser  of the  Portfolio  to provide  investment  advice and to
          perform for the  Portfolio  such other  duties and  functions  as are
          hereinafter   set  forth.   The   Sub-Adviser   hereby  accepts  such
          appointment and agrees to give the Portfolio and the Trust's Board of
          Trustees  (the  "Trustees"),  directly  or through the  Adviser,  the
          benefit  of the  Sub-Adviser's  best  judgment,  effort,  advice  and
          recommendations in respect of its duties as defined in Section 2. 
        
          (b) The Adviser hereby  represents  and warrants to the  Sub-Adviser,
          which   representations   and  warranties   shall  be  deemed  to  be
          continuing,  that (i) it has full power and  authority  to enter into
          this Agreement and to delegate  investment  management  discretion on
          behalf of the Portfolio to the Sub-Adviser, and (ii) it has taken all
          necessary  and proper  action to authorize the execution and delivery
          of this Agreement.
        
          (c) The  Sub-Adviser  hereby  represents and warrants to the Adviser,
          which   representations   and  warranties   shall  be  deemed  to  be
          continuing,  that (i) it has full power and  authority  to enter into
          this Agreement, and (ii) it has taken all necessary and proper action
          to authorize the execution and delivery of this Agreement.

                                       1

<PAGE>

2.  Delivery of Documents 
- -------------------------

Prior  to the  execution  of this  Agreement,  the  Adviser  will  furnish  the
Sub-Adviser with copies,  properly  certified or authenticated,  of each of the
following documents:

          (a) The Trust's Agreement and Declaration; and all amendments thereto
          or restatements thereof;
        
          (b) The Trust's By-Laws; and all amendments thereto;
        
          (c)  Resolutions  of the Trust's  Board of Trustees  authorizing  the
          appointment of the Sub-Adviser and approving this Agreement;
        
          (d) The Trust's  original  Notification  of Registration on Form N-8A
          under the 1940 Act;
        
          (e) The Trust's initial Registration Statement on Form N-1A under the
          1940 Act and all amendments thereto;
        
          (f) The current Confidential Offering Circular, Prospectus or similar
          document of any entity which the Trust has  authorized as an investor
          (the "Authorized  Investor") in the Portfolio (the "Investor Offering
          Documents");
        
          (g) The  policies  and  procedures  applicable  to the  Portfolio  as
          adopted by the Trustees; and all amendments and supplements thereto.

          (h)  Any  further  documents,   materials  or  information  that  the
          Sub-Adviser may reasonably  request from time to time to enable it to
          perform its duties pursuant to this Agreement.
        
3.  Sub-Adviser Duties
- ---------------------- 

The Sub-Adviser shall,  subject to the direction and control of the Trustees or
the Adviser, and in accordance with the objective and policies of the Portfolio
and the implementation thereof as set forth in the Investor Offering Documents,
the Portfolio's  Registration Statement on Form N-1A and any applicable federal
and state laws: (i) regularly provide investment advice and  recommendations to
the Portfolio, with respect to the Portfolio's investments, investment policies
and  the  purchase  and  sale  of   securities;   (ii)  supervise  and  monitor
continuously the investment program of the Portfolio and the composition of its
portfolio  and  determine  what  securities  shall be purchased and sold by the
Portfolio;  (iii) arrange,  subject to the provisions of Section 5 hereof,  for
the purchase of securities and other investments for the Portfolio and the sale
of securities and other  investments of the Portfolio;  (iv) provide reports on
the foregoing to the Adviser in such detail as the Adviser may reasonably  deem
to be  appropriate in order to permit the Adviser to determine the adherence by
the  Sub-Adviser  to the  investment  policies  and legal  requirements  of the
Portfolio;  and (v) make its officers and employees available to the Adviser at
reasonable  times to review the  investment  policies of the  Portfolio  and to
consult with the Adviser regarding the investment affairs of the Portfolio.

4.  Compensation of the Sub-Adviser
- ----------------------------------- 

The Adviser will pay to the Sub-Adviser as compensation  for the  Sub-Adviser's
services  rendered  and for  the  expenses  borne  by the  Sub-Adviser,  a fee,
determined as described in Schedule A which is attached

                                       2

<PAGE>

hereto and made a part  hereof.  Such fee shall be paid by the  Adviser and the
Trust shall have no liability therefor. Nothing in this Agreement shall require
the Sub-Adviser to bear expenses of the Adviser, the Portfolio or the Trust.

5.  Portfolio Transactions and Brokerage 
- ----------------------------------------

The  Sub-Adviser  shall place all orders for the purchase and sale of portfolio
securities  for the  Portfolio's  account  with  issuers,  brokers  or  dealers
selected by the Sub-Adviser, which may include where permissible under the 1940
Act, brokers or dealers  affiliated with the  Sub-Adviser.  In the selection of
such  brokers or dealers and the  placing of such  orders,  the Adviser  always
shall seek best execution,  which is to place  transactions where the Portfolio
can obtain the most favorable  combination  of price and execution  services in
particular  transactions  or  provided  on a  continuing  basis by a broker  or
dealer,  and to deal  directly  with a  principal  market  in  connection  with
over-the-counter  transactions,  except when it is believed that best execution
is obtainable elsewhere. Nothing in this Agreement shall preclude the combining
of orders for the sale or  purchase of  securities  or other  investments  with
other accounts managed by the Sub-Adviser or its affiliates,  provided that the
Sub-Adviser does not favor any account over any other account and provided that
any purchase or sale orders executed contemporaneously shall be allocated in an
equitable manner among the accounts involved.

6.  Interested Trustees or Parties 
- ----------------------------------

It is understood that Trustees,  officers, and shareholders of the Trust may be
or become  interested in the Adviser or the Sub-Adviser as directors,  officers
or employees and that  directors,  officers and  stockholders of the Adviser or
the Sub-Adviser may be or become  similarly  interested in the Trust,  and that
the Adviser or the  Sub-Adviser  may be or become  interested in the Trust as a
shareholder or otherwise.

7.  Services Not Exclusive
- --------------------------

The services of the Sub-Adviser to the Adviser are not to be deemed  exclusive,
the  Sub-Adviser  being free to render  services  to others and engage in other
activities,  provided, however, that such other services and activities do not,
during the term of this Agreement,  interfere,  in a material manner,  with the
Sub-Adviser's  ability to meet all of its obligations with respect to rendering
investment  advice  hereunder.  The  Sub-Adviser,  its affiliates and its other
clients may at any time acquire or dispose of securities  which are at the same
time being  acquired  or  disposed  of for the  account of the  Portfolio.  The
Sub-Adviser shall not be obligated to acquire for the Portfolio any security or
other investment which the Sub-Adviser or its affiliates may acquire for its or
their own accounts or for the account of another client.

8.  Compliance;  Books and Records 
- ----------------------------------

          (a) The Sub-Adviser  agrees to maintain  compliance  procedures which
          are reasonably designed to ensure the Portfolio's compliance with the
          applicable  provisions  of the 1940 Act and any rules or  regulations
          thereunder and the investment objective, policies and restrictions of
          the  Portfolio  as  set  forth  in  the  current  Investor   Offering
          Documents.
        
          (b) The  Sub-Adviser  shall furnish to the Adviser,  at the Adviser's
          expense,  copies of all records prepared and maintained in connection
          with  the  performance  of  this  Agreement  and the  maintenance  of
          compliance  procedures  pursuant to this Section 8 as the Adviser may
          reasonably request.

                                       3

<PAGE>
        
          (c) The Sub-Adviser  agrees to provide upon reasonable request of the
          Adviser,  information  regarding the  Sub-Adviser,  including but not
          limited to,  background  information  about the  Sub-Adviser  and its
          personnel and performance data, for use in connection with efforts to
          promote the Fund and the sale of its shares.
        
          (d) In compliance with the  requirements of Rule 31a-3 under the 1940
          Act,  the  Sub-Adviser  hereby  agrees  that  all  records  which  it
          maintains  for the Trust are the  property  of the Trust and  further
          agrees to  surrender  promptly to the Trust any of such  records upon
          the Trust's request.  The Sub-Adviser  further agrees to preserve for
          the periods  prescribed  by Rule 31a-2 under the 1940 Act any records
          which it is  required  to  maintain by Rule 31a-1 under the 1940 Act.
          The  Sub-Adviser  will  treat   confidentially   and  as  proprietary
          information of the Trust all records and other  information  obtained
          from the Trust  relative  to the  Authorized  Investors  and prior or
          potential shareholders, except as otherwise required by law.
        
9.  Limitation of Liability of Sub-Adviser; Indemnification 
- -----------------------------------------------------------

In  consideration  of the  Sub-Adviser's  undertaking  to render  the  services
described in this Agreement,  the Adviser agrees that the Sub-Adviser shall not
be liable for any loss  suffered  by the  Adviser,  the Trust,  the  Authorized
Investors  or their  shareholders,  or the  Portfolio  in  connection  with the
performance of this Agreement, provided that nothing in this Agreement shall be
deemed to protect or purport to protect the  Sub-Adviser  against any liability
to the Adviser, the Trust, the Authorized  Investors or their shareholders,  or
the Portfolio to which the Sub-Adviser  would otherwise be subject by reason of
willful  misfeasance,  bad faith or negligence in the performance of its duties
under this Agreement.

10.  Duration, Amendment and Termination
- ----------------------------------------

          (a) Subject to prior  termination as provided in  sub-section  (d) of
          this Section 10, this  Agreement  shall  continue in effect until two
          years  from  the  date  hereof  and  for  successive  annual  periods
          thereafter,  but only so long as the  continuance  after such initial
          two year period shall be  specifically  approved at least annually by
          vote  of the  Board  of  Trustees  or by vote  of a  majority  of the
          outstanding  voting  securities of the  Portfolio and the  Authorized
          Investors.
        
          (b) This  Agreement  may be modified by the written  agreement of the
          Adviser, the Sub-Adviser and the Portfolio,  such consent on the part
          of the  Portfolio  to be  authorized  by  vote of a  majority  of the
          outstanding  voting  securities of the  Portfolio and the  Authorized
          Investors if required by law. The execution of any such  modification
          or  amendment  by a  party  shall  constitute  a  representation  and
          warranty  to  the  other  parties  that  all  necessary  consents  or
          approvals  with respect to such  modification  or amendment have been
          obtained.
        
          (c) In addition to the  requirements of  sub-sections  (a) and (b) of
          this  Section  10,  the  terms of any  continuance,  modification  or
          amendment of the  Agreement  must have been approved by the vote of a
          majority of those  Trustees who are not parties to such  Agreement or
          interested  persons  of any such  party,  cast in person at a meeting
          called for the purpose of voting on such approval.
        
          (d) Either the Adviser,  the Sub-Adviser or the Portfolio may, at any
          time on sixty (60) days' prior written  notice to the other  parties,
          terminate this Agreement,  without payment of any penalty, and in the
          case of the Portfolio, by action of its Board of Trustees, or by vote
          of a majority of its outstanding voting securities.

                                       4

<PAGE>
        
          (e) This Agreement shall terminate  automatically in the event of its
          assignment.
           
          (f)  Termination of this Agreement  shall not relieve the Adviser nor
          the  Sub-Adviser  from any  liability or obligation in respect of any
          matters,  undertakings or conditions  which shall not have been done,
          observed or performed prior to such  termination.  All records of the
          Portfolio in the possession of the  Sub-Adviser  shall be returned to
          the Portfolio as soon as reasonably practicable after the termination
          of this Agreement.

11.  Disclaimer of Shareholder Liability 
- ----------------------------------------

The Adviser and the  Sub-Adviser  understand  that the obligations of the Trust
under this  Agreement  are not binding upon any Trustee or  shareholder  of the
Trust personally, but bind only the Trust and the Trust's property.

12.  Miscellaneous
- ------------------ 

          (a)  The  terms  "vote  of  a  majority  of  the  outstanding  voting
          securities,"   "assignment,"  and  "interested  persons,"  when  used
          herein,  shall have the respective meanings specified in the 1940 Act
          as now in effect or as hereafter amended.
        
          (b) The captions in this  Agreement are included for  convenience  of
          reference  only and in no way define or delimit any of the provisions
          hereof or otherwise affect their construction or effect.
        
          (c) If any provision of this Agreement  shall be held or made invalid
          by a court  decision,  statute,  rule or otherwise,  the remainder of
          this Agreement shall not be affected thereby.
        
          (d) This  Agreement  shall be  binding  upon and  shall  inure to the
          benefit of the parties hereto and their respective successors.
        
          (e) This Agreement may be executed in two or more counterparts, which
          taken together shall constitute one and the same instrument.
        
          (f) Any notice under this  Agreement  shall be in writing,  addressed
          and delivered or mailed,  postage prepaid, to the other party at such
          address as such other  party may  designate  for the  receipt of such
          notice. No notice shall be effective until received.

     IN WITNESS WHEREOF, the parties have caused this instrument to be executed
by their  respective  officers  designated  below as of the day and year  first
above written.
  
                             

                               INVESTORS BANK & TRUST COMPANY ("ADVISER")


                               By:  
                                   -------------------------------------
                               Name:  Kevin J. Sheehan
                               Title: President

                                       5


<PAGE>

                               ALLMERICA ASSET MANAGEMENT, INC. ("SUB-ADVISER")


                               By:  
                                   -------------------------------------
                               Name:  John P. Kavanaugh
                               Title: President
                                


The Merrimac Master Portfolio on behalf of the 
Merrimac U.S. Government Portfolio hereby acknowledges 
the execution of this Agreement 

Merrimac Master Portfolio 
("THE TRUST") 


By:   
    -------------------------------------
Name:  Paul J. Jasinski
Title: President

















                                       6

<PAGE>

                                  SCHEDULE A

The  Adviser  will  pay  to  the  Sub-Adviser  as  full  compensation  for  the
Sub-Adviser's services rendered an annual fee, computed and paid monthly, based
on the average daily net assets of the Portfolio  according to the schedule set
forth below.  The fee for each month shall be payable  within 30 business  days
after the end of the month.

If the  Sub-Adviser  shall  serve for any period  less than a full  month,  the
foregoing compensation shall be prorated according to the proportion which such
period bears to a full month.

                  0.09% on the first $500,000,000 in assets;
                 0.07% on the next $500,000,000 in assets; and
                   0.06% on assets exceeding $1,000,000,000





















                                       7



                          GOODWIN, PROCTER & HOAR LLP

                               COUNSELLORS AT LAW
                                 EXCHANGE PLACE
                        BOSTON, MASSACHUSETTS 02109-2881

                                                       TELEPHONE (617) 570-1000
                                                      TELECOPIER (617) 523-1231

                                 March 18, 1999

Merrimac Series
200 Clarendon Street
Boston, Massachusetts 02116

Ladies and Gentlemen:

     As counsel to Merrimac Series (the "Trust"), a Delaware business trust, we
have been asked to render our opinion in connection with the proposed issuance
of an indefinite number of Premium Class, Institutional Class and Investment
Class shares of beneficial interest, all with $0.001 par value, of the Trust
(the "Shares") representing interests in the Merrimac U.S. Government Series,
as more fully described in the Prospectus and Statement of Additional
Information contained in Post-Effective Amendment No. 3 (the "Amendment") to
the Trust's Registration Statement on Form N-1A (Registration No. 333-49693) to
be filed by the Trust with the Securities and Exchange Commission.

     We have examined the Master Trust Agreement dated as of March 30, 1998, as
amended, the By-Laws of the Trust, the minutes of certain meetings of the
Trustees, the Prospectus and Statement of Additional Information contained in
the Amendment, and such other documents, records and certificates as we have
deemed necessary for the purposes of this opinion.

     Based upon the foregoing, we are of the opinion that the Shares, when sold
in accordance with the terms of the Prospectus and Statement of Additional
Information in effect at the time of sale, will be legally issued, fully paid
and non-assessable by the Trust.

     We hereby consent to the filing of this opinion as an exhibit to the
Amendment and to the reference to this firm as legal counsel for the Trust in
the Prospectus and Statement of Additional Information contained in the
Amendment.

                                    Very truly yours,

                                    /s/ GOODWIN, PROCTER & HOAR  LLP

                                    GOODWIN, PROCTER & HOAR  LLP



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