BELLWETHER EXPLORATION CO
SC 13D/A, 1999-11-12
CRUDE PETROLEUM & NATURAL GAS
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                              AMENDMENT NO. 2
                                  SCHEDULE 13D
                                 (Rule 13d-101)

INFORMATION  TO BE INCLUDED IN  STATEMENTS  FILED  PURSUANT TO RULE 13d-1(a) AND
AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(a)


                         Bellwether Exploration Company
- --------------------------------------------------------------------------------

                                (Name of Issuer)

                          Common Stock, $.01 par value
- --------------------------------------------------------------------------------

                         (Title of Class of Securities)

                                   070895 20 7
- --------------------------------------------------------------------------------

                                 (CUSIP NUMBER)

                          Rho Management Partners, L.P.
                                  124 Dune Road
                             Quogue, New York 11959
                                 (516) 653-9086


                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                               - with copies to -

                             Stephen Rosenberg, Esq.
                    Tannenbaum Helpern Syracuse & Hirschtritt
                          900 Third Avenue - 13th Floor
                            New York, New York 10022
                                 (212) 508-6700

                                November 2, 1999
                          (Date of event which requires
                            filing of this statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(e),  13d-1(f) or 13d-1(g) check the following box
[ ]



<PAGE>


 ------------------------                             ------------------------
| CUSIP NO. 070895 20 7  |           13D             |  Page 2 of 12          |
 ------------------------                             ------------------------


- --------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

           Rho Management Partners, L.P.
- -------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP     (a)  [X]
                                                                (b)  [ ]
- -------------------------------------------------------------------------------
    3      SEC USE ONLY
- -------------------------------------------------------------------------------
    4      SOURCE OF FUNDS
           N/A
- -------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
           PURSUANT TO ITEM 2(d) OR 2(e)                             [ ]

- -------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION
           Delaware
- --------------------------------------------------------------------------------
  NUMBER OF    |  7  |   SOLE VOTING POWER
   SHARES      |     |        1,222,090 Shares (See Item 5)
BENEFICIALLY   |  8  |   SHARED VOTING POWER
  OWNED BY     |     |        0 Shares
   EACH        |  9  |   SOLE DISPOSITIVE POWER
 REPORTING     |     |        1,222,090 Shares
PERSON WITH    | 10  |   SHARED DISPOSITIVE POWER
               |     |        0 Shares
- --------------------------------------------------------------------------------
   11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
          1,222,090 Shares (See Item 5)
- --------------------------------------------------------------------------------
   12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
          CERTAIN SHARES                                          [ ]
- --------------------------------------------------------------------------------
   13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

          8.82% of Common Stock (See Item 5)
- --------------------------------------------------------------------------------
   14     TYPE OF REPORTING PERSON
          PN
- --------------------------------------------------------------------------------


                              Page 2 of 12 Pages

<PAGE>


 ------------------------                             ------------------------
| CUSIP NO. 070895 20 7  |           13D             |  Page 3 of 12          |
 ------------------------                             ------------------------


- --------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

           Rho Management Trust III
- -------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP     (a)  [X]
                                                                (b)  [ ]
- -------------------------------------------------------------------------------
    3      SEC USE ONLY
- -------------------------------------------------------------------------------
    4      SOURCE OF FUNDS
           WC
- -------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
           PURSUANT TO ITEM 2(d) OR 2(e)                             [ ]

- -------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION
           New York
- --------------------------------------------------------------------------------
  NUMBER OF    |  7  |   SOLE VOTING POWER
   SHARES      |     |        225,000 Shares (See Item 5)
BENEFICIALLY   |  8  |   SHARED VOTING POWER
  OWNED BY     |     |        0 Shares
   EACH        |  9  |   SOLE DISPOSITIVE POWER
 REPORTING     |     |        225,000 Shares
PERSON WITH    | 10  |   SHARED DISPOSITIVE POWER
               |     |        0 Shares
- --------------------------------------------------------------------------------
   11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
          225,000 Shares (See Item 5)
- --------------------------------------------------------------------------------
   12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
          CERTAIN SHARES                                          [ ]
- --------------------------------------------------------------------------------
   13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

          1.62% of Common Stock (See Item 5)
- --------------------------------------------------------------------------------
   14     TYPE OF REPORTING PERSON
          OO
- --------------------------------------------------------------------------------


                              Page 3 of 12 Pages

<PAGE>


 ------------------------                             ------------------------
| CUSIP NO. 070895 20 7  |           13D             |  Page 4 of 12          |
 ------------------------                             ------------------------


- --------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

           Rho Management Trust IV
- -------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP     (a)  [X]
                                                                (b)  [ ]
- -------------------------------------------------------------------------------
    3      SEC USE ONLY
- -------------------------------------------------------------------------------
    4      SOURCE OF FUNDS
           WC
- -------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
           PURSUANT TO ITEM 2(d) OR 2(e)                             [ ]

- -------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION
           New York
- --------------------------------------------------------------------------------
  NUMBER OF    |  7  |   SOLE VOTING POWER
   SHARES      |     |          268,500 Shares (See Item 5)
BENEFICIALLY   |  8  |   SHARED VOTING POWER
  OWNED BY     |     |        0 Shares
   EACH        |  9  |   SOLE DISPOSITIVE POWER
 REPORTING     |     |          268,500 Shares
PERSON WITH    | 10  |   SHARED DISPOSITIVE POWER
               |     |        0 Shares
- --------------------------------------------------------------------------------
   11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
            268,500 Shares (See Item 5)
- --------------------------------------------------------------------------------
   12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
          CERTAIN SHARES                                          [ ]
- --------------------------------------------------------------------------------
   13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

          1.94% of Common Stock (See Item 5)
- --------------------------------------------------------------------------------
   14     TYPE OF REPORTING PERSON
          OO
- --------------------------------------------------------------------------------


                              Page 4 of 12 Pages

<PAGE>


 ------------------------                             ------------------------
| CUSIP NO. 070895 20 7  |           13D             |  Page 5 of 12          |
 ------------------------                             ------------------------


- --------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

           Alpine Investment Partners
- -------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP     (a)  [X]
                                                                (b)  [ ]
- -------------------------------------------------------------------------------
    3      SEC USE ONLY
- -------------------------------------------------------------------------------
    4      SOURCE OF FUNDS
           WC
- -------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
           PURSUANT TO ITEM 2(d) OR 2(e)                             [ ]

- -------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION
           New York
- --------------------------------------------------------------------------------
  NUMBER OF    |  7  |   SOLE VOTING POWER
   SHARES      |     |          728,590 Shares (See Item 5)
BENEFICIALLY   |  8  |   SHARED VOTING POWER
  OWNED BY     |     |        0 Shares
   EACH        |  9  |   SOLE DISPOSITIVE POWER
 REPORTING     |     |          728,590 Shares
PERSON WITH    | 10  |   SHARED DISPOSITIVE POWER
               |     |        0 Shares
- --------------------------------------------------------------------------------
   11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
            728,590 Shares (See Item 5)
- --------------------------------------------------------------------------------
   12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
          CERTAIN SHARES                                          [ ]
- --------------------------------------------------------------------------------
   13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

          5.26% of Common Stock (See Item 5)
- --------------------------------------------------------------------------------
   14     TYPE OF REPORTING PERSON
          PN
- --------------------------------------------------------------------------------


                              Page 5 of 12 Pages

<PAGE>


 ------------------------                             ------------------------
| CUSIP NO. 070895 20 7  |           13D             |  Page 6 of 12          |
 ------------------------                             ------------------------


- --------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

           XBF Inc.
- -------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP     (a)  [X]
                                                                (b)  [ ]
- -------------------------------------------------------------------------------
    3      SEC USE ONLY
- -------------------------------------------------------------------------------
    4      SOURCE OF FUNDS
           WC
- -------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
           PURSUANT TO ITEM 2(d) OR 2(e)                             [ ]

- -------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION
           New York
- --------------------------------------------------------------------------------
  NUMBER OF    |  7  |   SOLE VOTING POWER
   SHARES      |     |        1,242 Shares (See Item 5)
BENEFICIALLY   |  8  |   SHARED VOTING POWER
  OWNED BY     |     |        0 Shares
   EACH        |  9  |   SOLE DISPOSITIVE POWER
 REPORTING     |     |        1,242 Shares
PERSON WITH    | 10  |   SHARED DISPOSITIVE POWER
               |     |        0 Shares
- --------------------------------------------------------------------------------
   11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
          1,242 Shares (See Item 5)
- --------------------------------------------------------------------------------
   12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
          CERTAIN SHARES                                          [ ]
- --------------------------------------------------------------------------------
   13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

         0.009% of Common Stock (See Item 5)
- --------------------------------------------------------------------------------
   14     TYPE OF REPORTING PERSON
          CO
- --------------------------------------------------------------------------------


                              Page 6 of 12 Pages

<PAGE>


 ------------------------                             ------------------------
| CUSIP NO. 070895 20 7  |           13D             |  Page 7 of 12          |
 ------------------------                             ------------------------


- --------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

           Joshua Ruch
- -------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP     (a)  [X]
                                                                (b)  [ ]
- -------------------------------------------------------------------------------
    3      SEC USE ONLY
- -------------------------------------------------------------------------------
    4      SOURCE OF FUNDS
           N/A
- -------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
           PURSUANT TO ITEM 2(d) OR 2(e)                             [ ]

- -------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION
           Republic of South Africa
- --------------------------------------------------------------------------------
  NUMBER OF    |  7  |   SOLE VOTING POWER
   SHARES      |     |           26,242 Shares (See Item 5)
BENEFICIALLY   |  8  |   SHARED VOTING POWER
  OWNED BY     |     |        1,222,090 Shares
   EACH        |  9  |   SOLE DISPOSITIVE POWER
 REPORTING     |     |          26,242 Shares
PERSON WITH    | 10  |   SHARED DISPOSITIVE POWER
               |     |        1,222,090 Shares
- --------------------------------------------------------------------------------
   11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
          1,248,332 Shares (See Item 5)
- --------------------------------------------------------------------------------
   12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
          CERTAIN SHARES                                          [ ]
- --------------------------------------------------------------------------------
   13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

          9.01% of Common Stock (See Item 5)
- --------------------------------------------------------------------------------
   14     TYPE OF REPORTING PERSON
          IN
- --------------------------------------------------------------------------------


                              Page 7 of 12 Pages

<PAGE>

CUSIP No. 070895 20 7                                SCHEDULE 13D

Item 1.             Security and Issuer.

Security: Common Stock

Issuer:             Bellwether Exploration Company (the "Issuer")
                    1331 Lamar Street, Suite 1455
                    Houston, Texas 77010-3039

Item 2.             Identity and Background.

     This Statement is being filed by Rho  Management  Partners L.P., a Delaware
limited  partnership  ("Rho"),  whose address is 124 Dune Road, Quogue, New York
11959.

     Rho is an  investment  advisor  to Rho  Management  Trust  III,  a New York
grantor trust ("Trust III"), which is a registered owner of the Issuer's shares.
Pursuant to an investment  advisory agreement between Rho and Trust III, Rho has
sole investment  discretion and voting authority with respect to the shares held
by Trust III. Trust III's address is c/o Rho Management Company,  Inc., 152 West
57th Street,  New York,  New York 10019.  The trustee of Trust III is William F.
Indoe,  Esq., whose address is Sullivan & Cromwell,  125 Broad Street, New York,
New York 10004.

     Rho is also an investment  advisor to Rho  Management  Trust IV, a New York
grantor trust ("Trust IV"),  which is a registered owner of the Issuer's shares.
Pursuant to an investment  advisory  agreement between Rho and Trust IV, Rho has
sole investment  discretion and voting authority with respect to the shares held
by Trust IV. Trust IV's address is c/o Rho  Management  Company,  Inc., 152 West
57th  Street,  New York,  New York 10019.  The trustee of Trust IV is William F.
Indoe,  Esq., whose address is Sullivan & Cromwell,  125 Broad Street, New York,
New York 10004.

     Rho is the investment  advisor of Alpine  Investment  Partners,  a New York
general partnership (the  "Partnership") and has the sole investment  discretion
and voting  authority with respect to the investments  held by the  Partnership.
The  Partnership's  address is c/o Rho Management  Company,  Inc., 152 West 57th
Street, New York, New York 10019.

     This  Statement  is also being  filed by Joshua  Ruch.  Joshua  Ruch is the
controlling   stockholder  of  Atlas  Capital  Corp.,  a  Delaware   corporation
("Atlas"), which is the sole general partner of Rho. In addition, Joshua Ruch is
the Chairman, CEO and controlling stockholder of Rho Management Company, Inc., a
New York corporation  ("RMC"),  to which certain advisory duties  concerning the
shares may be delegated by Rho. In such capacities, Joshua Ruch exercises voting
control and  dispositive  power over the shares  reported  herein by Rho. Joshua
Ruch therefore may be deemed to have indirect  beneficial  ownership over shares
controlled by Rho.

     The Statement is also being filed by XBF, Inc., a New York corporation (the
"Corporation").  Joshua Ruch is the sole  shareholder  and sole  director of the
Corporation,  and he has sole  investment  discretion and voting  authority with
respect to the shares held by the Corporation.  The Corporation's address is c/o
Rho Management Company, Inc., 152 West 57th Street, New York, New York 10019.


                    Page 8 of 11 Pages

<PAGE>

     The  executive  officers of Atlas and RMC are Joshua Ruch,  Chairman & CEO;
Habib Kairouz,  Managing Director;  Mark Leschley,  Managing Director, and Peter
Kalkanis,  Chief Financial  Officer.  The address of each of such officer is c/o
Rho Management Company,  Inc. 152 West 57th Street, New York, NY 10019. Mr. Ruch
is a citizen  of the  Republic  of South  Africa,  Mr.  Kairouz  is a citizen of
Canada,  Mr.  Leschley is a citizen of Denmark and Mr.  Kalkanis is a citizen of
the U.S.A.  Mr. Ruch is a director of Atlas and RMC.  Mr. Indoe is a director of
RMC. Mr. Kairouz is a director of the Issuer.

     During  the  last  five  years,  none of Rho,  Trust  III,  Trust  IV,  the
Partnership,  the  Corporation,  Joshua Ruch or, to the best of their knowledge,
any of the executive  officers of Atlas or RMC, has been convicted in a criminal
proceeding (excluding traffic violations or similar misdemeanors), or has been a
party to a civil  proceeding of a judicial or  administrative  body of competent
jurisdiction  as a result of which any of the  foregoing  was or is subject to a
judgment,  decree or final order enjoining future  violations of, or prohibiting
or mandating  activities subject to, federal or state securities laws or finding
any violation with respect to such laws.

     Item 3. Source and Amount of Funds or Other Consideration.

     All of the Shares were acquired  through  working  capital of the reporting
persons.

Item 4              Purpose of Transaction

     The shares have been  acquired  solely for  investment  purposes.  Rho may,
subject to market  conditions  and its  assessment of business  prospects of the
Issuer, cause Trust III, Trust IV, the Partnership or the Corporation to acquire
additional  shares of the Issuer from time to time,  through open market  and/or
privately negotiated transactions, as Rho determines in its discretion. Rho may,
however,  determine  at any time to cease  effecting  such  purchases  and/or to
dispose  of all or a portion of the  shares  owned by Trust  III,  Trust IV, the
Partnership or the Corporation.

     Rho will  continue to evaluate the  business and business  prospects of the
Issuer,  and its present and future interest in, and intentions with respect to,
the Issuer,  and in  connection  therewith  may from time to time  consult  with
management and other shareholders of the Issuer.

     Other than as described  above,  neither Rho nor Trust III nor Trust IV nor
the  Partnership  nor the Corporation nor Mr. Ruch have plans or proposals which
would result in any of the following:

          a. the  acquisition  by any  person of  additional  securities  of the
          Issuer, or the disposition of securities of the Issuer;

          b.  an  extraordinary   corporate  transaction,   such  as  a  merger,
          reorganization  or  liquidation,  involving  the  Issuer or any of its
          subsidiaries;

                    Page 9 of 12 Pages

<PAGE>

          c. a sale or transfer of a material  amount of assets of the Issuer or
          any of its subsidiaries;

          d. any change in the present  board of directors or  management of the
          Issuer,  including any plans or proposals to change the number or term
          of directors or to fill any vacancies on the board;

          e. any  material  change in the  present  capitalization  or  dividend
          policy of the Issuer;

          f. any other  material  change in the  Issuer's  business or corporate
          structure;

          g.  changes  in  the   Issuer's   charter,   by-laws  or   instruments
          corresponding   thereto  or  other   actions   which  may  impede  the
          acquisition of control of the Issuer by any person;

          h. causing a class of  securities  of the Issuer to be delisted from a
          national securities exchange or to cease to be authorized to be quoted
          in an interdealer quotation system of a registered national securities
          association;

          i. causing a class of securities of the Issuer to become  eligible for
          termination of registration  pursuant to Section  12(g)(4) of the Act;
          or

          j. any action similar to any of those enumerated above.

Item 5.             Interest in Securities of the Issuer.

     (a) - (b) As the holder of sole voting and  investment  authority  over the
shares owned by its advisory  clients,  Rho may be deemed,  for purposes of Rule
13d-3  under  the  Securities  Exchange  Act  of  1934,  as  amended,  to be the
beneficial  owner of the  aggregate  amount  of  1,222,090  shares  representing
approximately  8.82%  of the  outstanding  shares  of  the  Issuer  (based  upon
13,853,791  shares  outstanding  as of August 2, 1999, as reported on the latest
10-Q of the Issuer)  consisting  of:  225,000  shares held by Trust III (1.62%),
268,500  shares  registered  in the  name of Trust IV  (1.94%),  728,590  shares
registered in the name of the Partnership (5.26%) and 1,242 shares registered in
the name of the  Corporation  (0.009%).  Rho disclaims any economic  interest or
beneficial ownership of shares covered by this Statement.

     As the  controlling  person  of  Rho,  Mr.  Ruch  may  also be  deemed  the
beneficial  owner  of such  shares.  Additionally,  he may be  deemed  to be the
beneficial  owner of 25,000  shares  held  individually  and  1,242  held by the
Corporation. Thus, Mr. Ruch may be deemed, for purposes of Rule 13d-3, to be the
beneficial  owner of 1,248,332  shares of the Issuer  (9.01% of the  outstanding
shares).  Mr. Ruch  disclaims any economic  interest or beneficial  ownership of
shares held by Rho.


                         Page 10 of 12 Pages

<PAGE>

(c)

<TABLE>
<S>                 <C>                     <C>                       <C>                <C>
Identity            Date                    Amount of Securities      Price/Share        Type

Trust IV            10/27/99                30,800                    5.625              Open-market purchase
Trust IV            10/28/99                 6,000                    5.685              Open-market purchase
Trust IV            10/29/99                32,200                    6.043              Open-market purchase
Trust IV            11/01/99                60,000                    6.160              Open-market purchase
Trust IV            11/02/99                55,000                    6.054              Open-market purchase
Trust IV            11/03/99                37,000                    6.068              Open-market purchase
Trust IV            11/04/99                15,000                    6.060              Open-market purchase
Trust IV            11/05/99                 7,500                    6.123              Open-market purchase
Trust IV            11/08/99                25,000                    6.098              Open-market purchase

</TABLE>

(d)        Not applicable.

(e)        Not applicable.

     Item 6.  Contracts,  Arrangements,  Understandings  or  Relationships  with
Respect to Securities of the Issuer

           Not applicable.

Item 7.             Material to be Filed as Exhibits

          Not applicable.

Signatures

     After  reasonable  inquiry and to the best of my  knowledge  and belief,  I
certify that the information  set forth in this statement is true,  complete and
correct.

Dated: November 12, 1999


RHO MANAGEMENT PARTNERS L.P.
By: Atlas Capital Corp.,
       General Partner


/s/Joshua Ruch
- --------------------------
Title: President

                         Page 11 of 12 Pages

<PAGE>

RHO MANAGEMENT TRUST III
By:   Rho Management Company, Inc.,
         Investment Advisor



/s/Joshua Ruch
- ---------------------------
Title: President


RHO MANAGEMENT TRUST IV
By: Rho Management Company, Inc.,
       Investment Advisor



/s/Joshua Ruch
- --------------------------
Title: President


ALPINE INVESTMENT PARTNERS
By:  Joshua Ruch,
       General Partner



/s/Joshua Ruch
- --------------------------


XBF, Inc.
By:  Joshua Ruch,
       Shareholder and Director



By: /s/ Joshua Ruch
- --------------------------
Title:Shareholder and Director


JOSHUA RUCH


- ------------------------
/s/Joshua Ruch




                               Page 12 of 12 Pages


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