<PAGE>   1
                                                                  EXHIBIT 10.1

                       UNITED ASSET MANAGEMENT CORPORATION

                   AMENDED AND RESTATED 1994 STOCK OPTION PLAN
             [AS FURTHER AMENDED AND RESTATED AS OF MARCH 31, 1999]


                                    PREAMBLE
                                    --------

     The plan (the "Plan") comprises three subplans: Subplan A covers options to
be granted to any key employees, including officers, and any non-employees
(other than directors) who provide important services to United Asset Management
Corporation, a Delaware corporation ("UAM") or any of its subsidiaries or
parents. Subplan B covers options to be granted to employees of UAM or of its
subsidiaries who are subject to the income tax laws of the United Kingdom, to
the extent that such options can be granted with favorable income tax treatment
under such United Kingdom laws. Subplan C covers options to be granted to
non-employee directors of UAM.

     Subject to the adjustments provided in the Plan, the aggregate number of
shares of Common Stock of UAM which may be issued and sold pursuant to incentive
stock options (as defined below) granted under Subplan A or Options (as defined
below) granted under Subplan B of the Plan shall not exceed 11,900,000 shares of
Common Stock (as defined below), which may be either authorized but unissued
shares or treasury shares.* Except as provided below, the aggregate number of
shares of Common Stock which may be issued and sold pursuant to non-incentive
stock options (as defined below) granted under Subplan A or Subplan C of the
Plan shall not exceed the number of shares specified in the preceding sentence
(subject to the adjustments provided in the Plan), less (1) the number of shares
issued pursuant to Subplan A incentive stock options and Subplan B Options and
(2) the number of shares underlying outstanding Subplan A incentive stock
options and Subplan B Options. Notwithstanding the foregoing, additional shares
of Common Stock may be issued and sold pursuant to non-incentive stock options
granted under Subplan A or Subplan C in amounts up to the number of additional
shares reserved for such purpose from time to time under one or more written
resolutions adopted by the Committee (as defined below). The additional shares
of Common Stock that the Committee may reserve for non-incentive stock options
pursuant to the preceding sentence shall meet the following requirements: (1)
all such additional shares must have been reacquired by UAM for not more than
their fair market value at the time of reacquisition and (2) as of the date of
the Committee's resolution to reserve the additional shares, the cumulative
amount received in cash by UAM upon the exercise of options granted under the
Plan shall not be less than the aggregate amount paid for the reacquired shares
that are included in such resolution or in any prior resolution to reserve
additional shares. If any option granted under the Plan shall terminate or
expire without being fully exercised, the shares which have not been purchased
will again become available for purposes of the Plan.

-----------------
* Of these 11,900,000 total shares, 6,400,000 were originally reserved under the
Plan by action of the shareholders in 1994 and 5,500,000 have been reserved
under the amended and restated Plan by action of the shareholders in 1997.

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                     SUBPLAN A--U.S. SUBPLAN PORTION OF THE
                     --------------------------------------
                   AMENDED AND RESTATED 1994 STOCK OPTION PLAN
                   -------------------------------------------
                [AS FURTHER AMENDED AND RESTATED MARCH 31, 1999]
                ------------------------------------------------


1.   PURPOSE OF SUBPLAN A

     The purpose of this Subplan A is to encourage key employees, including
officers, of UAM and any present or future subsidiary and parent of UAM
(hereinafter collectively referred to as the "Company") as well as non-employees
(other than directors of UAM) who provide important services to the Company to
acquire shares of common stock of UAM, $.01 par value per share (the "Common
Stock"), and thereby increase their proprietary interest in the Company's
success and provide an added incentive to remain in the employ of the Company.
For purposes of this Subplan A, the words parent and subsidiary shall be
interpreted in accordance with Section 422 and Section 424 of the Internal
Revenue Code of 1986, as from time to time amended (the "Code"). It is intended
that options granted under this Subplan A shall constitute either "incentive
stock options" within the meaning of Section 422 of the Code, or "non-incentive
stock options", as determined by the Committee named in Section 3 of this
Subplan in its sole discretion and indicated on each form of option grant (the
"Option Grant"), and the terms of this Subplan and the Option Grants shall be
construed accordingly.

2.   SHARES RESERVED UNDER SUBPLAN A

     Subject to the adjustment provided in Section 9, the aggregate number of
shares of Common Stock which may be issued and sold pursuant to options granted
under this Subplan A of the Plan shall be determined in accordance with the
Preamble above.

3.   ADMINISTRATION

     Except to the extent otherwise provided in Subplan B, the Plan shall be
administered by a committee (the "Committee") consisting of not less than three
(3) members of the Board of Directors of UAM (the "Board"). Each of the members
of the Committee shall be a person who in the opinion of counsel to the Company
is (i) a "non-employee" as such term is used in Rule 16b-3 promulgated under the
Securities Exchange Act of 1934, as amended (the "Act"), and (ii) an "outside
director" as such term is used in Treasury regulation Section 1.162-27(e) (3)
under Section 162(m) of the Code. The Committee shall be appointed by, and shall
serve at the pleasure of, the Board of Directors. A majority of the members
present at any meeting at which a quorum is present, and any acts approved in
writing by all the members of the Committee without a meeting, shall constitute
the acts of the Committee. The Committee shall have the powers granted to it in
Sections 3, 4, 5, 7 and 8 of this Subplan A. The Committee is authorized to
interpret this Subplan A and, subject to the provisions of the Subplan, to
prescribe, amend, and rescind rules and regulations relating thereto. The
Committee is further authorized, subject to the express provisions of this
Subplan A, to alter or amend the form of Option Grant attached hereto as Exhibit
A and to make all other determinations necessary or advisable in the
administration of the Subplan. The interpretation and administration by the
Committee of any provisions of this

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Subplan A and the Option Grant shall be final and conclusive on all persons
having any interest therein.

     Notwithstanding any other provision of this Plan, if the Committee
determines that a person to whom an option may be granted under this Subplan A
will neither be a "covered employee" within the meaning of Section 162(m) of the
Code nor an employee subject to the short-swing profits rules of Section 16(b)
of the Act at any time from the date of grant until the end of the term of any
option which could be granted under this Subplan A at the time of such
determination, such options may be granted to such person by a committee
consisting of any number of members of the Board, any or all of whom would not
then be eligible to serve on the Committee. With respect to all options referred
to in this paragraph, the committee referred to in this paragraph shall have all
powers otherwise granted to the Committee in Sections 3, 4, 5, 7 and 8 of this
Subplan A, but the committee referred to in this paragraph shall not otherwise
administer this Subplan A.

     No members of the Committee or of any committee referred to in the
preceding paragraph or of the Board shall be held liable for any action or
determination made in good faith with respect to the Plan, this Subplan A, or
any option granted hereunder.

4.   OPTION GRANTS

     Options to purchase shares of Common Stock under this Subplan A may be
granted to key employees (including officers and directors who are employees) of
the Company and to non-employees who provide important services to the Company.
The term "Employee" will include, for purposes of this Subplan A key employees
as well as such non-employees who provide important services to the Company. In
selecting the Employees to whom options will be granted and in deciding how many
shares of Common Stock will be subject to each option, the Committee shall give
consideration to the importance of an Employee's duties, to his experience with
the Company, to his future value to the Company, to his present and potential
contribution to the success of the Company, and to such other factors as the
Committee may deem relevant. Subject to the express provisions of the Plan and
the form of Option Grant incorporated herein by reference as from time to time
altered or amended, the Committee shall have authority to determine with respect
to each Option Grant the number of installments, the number of shares of Common
Stock in each installment, and the exercise dates, and, to the extent not
inconsistent with the applicable provisions of the Code, if any, may specify
additional restrictions and conditions for any Option Grant. Each incentive
stock option shall expire not later than ten years from the date of the grant of
such option.

     Except as provided in Section 7 of this Subplan A, no incentive stock
option may be granted to any Employee who, at the time such option is granted
owns stock possessing more than 10 percent of the total combined voting power of
all classes of stock of the Company within the meaning of Section 422 of the
Code. Non-employees who provide services to the Company shall not be eligible to
receive incentive stock options under the Plan.

     The date of grant of an option under this Subplan A shall be the date the
Committee votes to grant the option, but no optionee shall have the right to
exercise his option until the Company has executed and delivered the Option
Grant to such optionee. Each option granted under this

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Subplan A shall be evidenced by and subject to the terms and conditions of the
Option Grant which is incorporated into the Plan by reference as from time to
time altered or amended.

     No incentive stock option may be transferred by the optionee, other than by
will or the laws of descent and distribution. An incentive stock option can be
exercised during such individual's life only by him. Notwithstanding the
foregoing, the Committee may grant non-incentive stock options under this
Subplan A or under Subplan C that are transferable (subject to any terms and
conditions imposed by the Committee) by the optionee, either directly or in
trust, to one or more members of the optionee's family. Following any transfer
permitted pursuant to this paragraph, of which the optionee has notified the
Committee in writing, such option may be exercised by the transferee(s), subject
to all terms and conditions of the Option Grant. For these purposes, the members
of the optionee's family are only the optionee's: (i) spouse; (ii) lineal
descendants; (iii) lineal ancestors; and (iv) siblings and spouses and children
of such siblings.

5.   OPTION PRICE

     The price per share at which each option granted under this Subplan A may
be exercised shall be determined by the Committee subject to the provisions of
this Section 5. In the case of an incentive stock option, the exercise price
shall not be less than the fair market value per share on the date of the grant,
as determined by the Committee in accordance with applicable provisions of the
Code then in effect. In the case of a non-incentive stock option, the exercise
price shall not be less than 50% of the fair market value per share on the date
of grant, as so determined. In no event shall the option price per share for any
option under the Plan be less than the par value per share.

6.   LIMITATION ON AMOUNT

     The aggregate fair market value (determined at the time the option is
granted) of the stock with respect to which incentive stock options are
exercisable for the first time by an individual during any calendar year under
all plans of the Company shall not exceed $100,000. To the extent that the
aggregate value of such options (determined in the order in which they were
granted) exceeds such amount, such options shall be treated as non-incentive
stock options.

     The maximum number of shares with respect to which any options may be
granted under the Plan (including this Subplan A) to any individual during any
single calendar year shall be 300,000 shares.

7.   SPECIAL RULE FOR 10 PERCENT SHAREHOLDERS

     The Committee may grant incentive stock options under this Subplan A to
Employees who own more than 10 percent of the combined voting stock of the
Company if (i) at the time of the Option Grant the price per share at which the
option may be exercised is at least 110 percent of the fair market value of the
stock subject to the option and (ii) such option is not exercisable after the
expiration of five years from the date such option is granted.

8.   NON-INCENTIVE STOCK OPTIONS

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     Notwithstanding the provisions of Sections 4, 5, 6 and 7 of this Subplan A,
the Committee may grant options which in one or more respects do not meet the
requirements for incentive stock options established by Section 422 of the Code.
The Committee shall indicate on each Option Grant whether an incentive stock
option within the meaning of Section 422 of the Code or a non-incentive stock
option is thereby granted.

     Except as otherwise provided in this Subplan A, the Committee, in its sole
discretion, shall establish the terms and conditions for each non-incentive
stock option which it grants. Such terms and conditions may, but need not,
include some or all of the provisions of Sections 4, 5, 6 and 7 of this Subplan
A with respect to incentive stock options. If the Committee grants an option
which in all respects meets the requirements for incentive stock options it may
nonetheless designate such option a non-incentive stock option on the Option
Grant.

9.   ADJUSTMENT OF SHARES RESERVED UNDER THE PLAN

     The aggregate number and kind of shares reserved under the Plan, the
maximum number of shares as to which options may be granted to any individual
and the option price per share shall be appropriately adjusted by the Board in
the event of any recapitalization, stock split, stock dividend, combination of
shares, or other similar change in the capitalization of the Company, but no
adjustment in the option price shall be made which would reduce the option price
per share to less than the par value per share, and any adjustment in the option
price for options granted under Subplan B of the Plan shall be subject to the
requirements of Rule 5 of Subplan B.

10.  DISSOLUTION OR REORGANIZATION

(A)  VESTING PROVISIONS

(1)  Notwithstanding anything to the contrary in this Subplan A, or in the
Option Grant, an optionee may purchase the full amount of shares of Common Stock
for which options have been granted to such optionee (the "optioned shares") and
for which the options have not been exercised, upon the occurrence of any of the
following events (individually and collectively a "Change of Control" over the
Company):

          (a)  STOCK TRANSFER OF 20% OR MORE. The acquisition by any individual,
          entity or group (within the meaning of Sections 13(d)(3) or 14(d)(2)
          of the Securities Exchange Act of 1934 (the "Act")) (a "Person") of
          beneficial ownership (within the meaning of Rule 13d-3 promulgated
          under the Act) of 20 percent or more of either (i) the then
          outstanding shares of the Common Stock or (ii) the combined voting
          power of the then outstanding voting securities of the Company
          entitled to vote generally in the election of the directors (the
          "Outstanding Company Voting Securities"); provided, however, that no
          change in such beneficial ownership percentage that results solely
          from a change in the aggregate number of outstanding shares of Common
          Stock or Outstanding Company Voting Securities shall constitute a
          Change of Control; provided further, however, that the following
          acquisitions shall not constitute a Change of Control: (A) any
          acquisition directly from the Company (excluding an acquisition by
          virtue of the exercise of a conversion privilege); (B) any acquisition
          by the

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          Company or by any corporation controlled by the Company; (C) any
          acquisition by any employee benefit plan (or related trust) sponsored
          or maintained by the Company or any corporation controlled by the
          Company; or (D) any acquisition by any corporation pursuant to a
          consolidation or merger, if, following such consolidation or merger,
          the conditions described in clauses (i), (ii), and (iii) of paragraph
          (c) below are satisfied; or

          (b)  CHANGE IN INCUMBENT BOARD OF 50% OR MORE. Individuals who, as of
          November 19, 1998 (the "Effective Date"), constitute the Board (the
          "Incumbent Board") ceasing for any reason to constitute at least a
          majority of the Board; provided, however, that any individual becoming
          a director subsequent to the Effective Date whose election, or
          nomination for election by the Company's shareholders, was approved by
          a vote or resolution of at least a majority of the directors then
          comprising the Incumbent Board shall be considered as though such
          individual were a member of the Incumbent Board, but excluding, for
          this purpose, any such individual whose initial assumption of office
          occurs as a result of either an actual or threatened election contest
          (as such terms are used in Rule 14a-11 of Regulation 14A promulgated
          under the Act) or other actual or threatened solicitation of proxies
          or consents by or on behalf of a Person other than the Board; or

          (c)  MERGER WITHOUT CONTINUITY OF OWNERSHIP IN EXCESS OF 60%. Adoption
          by the Board of a resolution approving an agreement of consolidation
          of the Company with or merger of the Company into another corporation
          or business entity in each case, unless, following such consolidation
          or merger, (i) more than 60 percent of, respectively, the then
          outstanding shares of common stock of the corporation resulting from
          such consolidation or merger and/or the combined voting power of the
          then outstanding voting securities of such corporation or business
          entity entitled to vote generally in the election of directors (or
          other persons having the general power to direct the affairs of such
          entity) is then beneficially owned, directly or indirectly, by all or
          substantially all of the individuals and entities who were the
          beneficial owners, respectively, of the Common Stock and Outstanding
          Company Voting Securities immediately prior to such consolidation or
          merger in substantially the same proportions as their ownership,
          immediately prior to such consolidation or merger, of the Common Stock
          and/or Outstanding Company Voting Securities, as the case may be, (ii)
          no Person (excluding the Company, any employee benefit plan (or
          related trust) of the Company or such corporation or other business
          entity resulting from such consolidation or merger and any Person
          beneficially owning, immediately prior to such consolidation or
          merger, directly or indirectly, 35 percent or more of the Common Stock
          and/or Outstanding Company Voting Securities, as the case may be)
          beneficially owns, directly or indirectly, 35 percent or more of,
          respectively, the then outstanding shares of common stock of the
          corporation resulting from such consolidation or merger or the
          combined voting power of the then outstanding voting securities of
          such corporation or business entity entitled to vote generally in the
          election of its directors (or other persons having the general

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          power to direct the affairs of such entity) and (iii) at least a
          majority of the members of the board of directors (or other group of
          persons having the general power to direct the affairs of the
          corporation or other business entity) resulting from such
          consolidation or merger were members of the Incumbent Board at the
          time of the execution of the initial agreement providing for such
          consolidation or merger; provided that any right which shall vest by
          reason of the action of the Board pursuant to this paragraph (c) shall
          be divested, with respect to any such right not already exercised,
          upon (A) the rejection of such agreement of consolidation or merger by
          the stockholders of the Company or (B) its abandonment by either party
          thereto in accordance with its terms; or

          (d) SALE OF ASSETS OR DISSOLUTION. Adoption by the requisite majority
          of the whole Board, or by the holders of such majority of stock of the
          Company as is required by law or by the Certificate of Incorporation
          or By-Laws of the Company as then in effect, of a resolution or
          consent authorizing (i) the dissolution of the Company or (ii) the
          sale or other disposition of all or substantially all of the assets of
          the Company, other than to a corporation or other business entity with
          respect to which, following such sale or other disposition, (A) more
          than 60 percent of, respectively, the then outstanding shares of
          common stock of such corporation and/or the combined voting power of
          the outstanding voting securities of such corporation or other
          business entity entitled to vote generally in the election of
          directors (or other persons having the general power to direct the
          affairs of such entity) is then beneficially owned, directly or
          indirectly, by all or substantially all of the individuals and
          entities who were the beneficial owners, respectively, of the Common
          Stock and Outstanding Company Voting Securities immediately prior to
          such sale or other disposition in substantially the same proportions
          as their ownership, immediately prior to such sale or other
          disposition, of the Common Stock and/or Outstanding Company Voting
          securities, as the case may be, (B) no Person (excluding the Company
          and any employee benefit plan (or related trust) of the Company or
          such corporation or other business entity and any Person beneficially
          owning, immediately prior to such sale or other disposition, directly
          or indirectly, 35 percent or more of the Common Stock and/or
          Outstanding Company Voting Securities, as the case may be)
          beneficially owns, directly or indirectly, 35 percent or more of,
          respectively, the then outstanding shares of common stock of such
          corporation and/or the combined voting power of the then outstanding
          voting securities of such corporation or other business entity
          entitled to vote generally in the election of directors (or other
          persons having the general power to direct the affairs of such entity)
          and (C) at least a majority of the members of the board of directors
          (or other group of persons having the general power to direct the
          affairs of such corporation or other entity) were members of the
          Incumbent Board at the time of the execution of the initial agreement
          or action of the Board providing for such sale or other disposition of
          assets of the Company; provided that any right which shall vest by
          reason of the action of the Board or the stockholders pursuant to this
          paragraph (d) shall be divested, with respect to any such right not
          already exercised, upon the abandonment by the

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          Company of such dissolution, or such sale or other disposition of
          assets, as the case may be.

(2)  Notwithstanding subsection (1) hereof, holder(s) of any unexercised
option(s) that meet the requirements for incentive stock options under Section
422 of the Code (the rights being "ISO Rights", and such holder being an "ISO
Optionee"), may elect at any time to waive the applicability of subsections (1)
hereof to such ISO Optionee's ISO Rights.

(3)  Notwithstanding subsections (1) or (2) hereof, after a Change of Control,
and upon adoption of a plan of dissolution, liquidation, merger, consolidation,
or reorganization of the Company (the "Event"), the Board may decide to
terminate each outstanding option granted under this Subplan A. If the Board so
decides, such option(s) shall terminate as of the effective date of the Event,
but the Board shall suspend the exercise of all outstanding options a reasonable
time prior to the Event, giving each optionee not less than fourteen days' prior
written notice of the date of suspension, prior to which an optionee may
purchase in whole or in part the shares available to him as of the date of
receipt of the notice. If the Event is not consummated, the suspension shall be
removed and all options shall continue in full force and effect, subject to the
terms of their respective option grants.

(B)  Expired Options

     Nothing herein shall allow the optionee to purchase optioned shares, the
options for which have expired.


11.  AMENDMENT AND TERMINATION OF PLAN AND SUBPLAN A

     The Board may amend, suspend, or terminate the Plan and/or this Subplan A,
including the form of Option Grant incorporated herein by reference. No such
action, however, may, without approval or ratification by the shareholders,
increase the maximum number of shares reserved under the Plan except as provided
in Section 9 of this Subplan A, Rule 5 of Subplan B, or Section 8 of Subplan C,
alter the class or classes of individuals eligible for options, or make any
other change which, pursuant to the Code or regulations thereunder or Section
16(b) of the Act and the rules and regulations promulgated thereunder, requires
action by the shareholders. No such action may, without the consent of the
holder of the option, alter or impair any option previously granted.

     In any event, the Plan shall terminate 10 years from the date of adoption
of the amended and restated Plan by the Board of Directors, or if earlier, from
the date of its approval by the shareholders. Any shares remaining under the
Plan at the time of termination which are not subject to outstanding options and
any shares which thereafter become available because of the expiration or
termination of an option shall cease to be reserved for purposes of the Plan.

12.  RIGHT TO TERMINATE EMPLOYMENT

     Nothing contained herein or in any Option Grant executed pursuant hereto
shall restrict the right of the Company to terminate the employment of any
optionee at any time.

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13.  DATE OF ADOPTION

     The date of adoption of this amended and restated Plan by the Board is
January 20, 1997, as further amended by action of the board effective on
November 19, 1998, December 29, 1998, and March 31, 1999.

14.  DATE OF APPROVAL

     The date of approval of this amended and restated Plan by the shareholders
and the Plan's effective date is May 15, 1997.


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                      SUBPLAN B--UK SUBPLAN PORTION OF THE
                      ------------------------------------
                   AMENDED AND RESTATED 1994 STOCK OPTION PLAN
                   -------------------------------------------
                [AS FURTHER AMENDED AND RESTATED MARCH 31, 1999]
                ------------------------------------------------

                RULES OF THE UNITED ASSET MANAGEMENT CORPORATION
                          EMPLOYEE SHARE OPTION SCHEME

1.   DEFINITIONS

     In this Scheme (hereinafter sometimes referred to as the "UK Subplan"),
     unless the context otherwise requires, the following words and expressions
     shall have the following meanings:

     "Act"                    the U.S. Securities Exchange Act of 1934, as
                              amended, and the rules and regulations promulgated
                              thereunder

     "Adoption Date"          the date on which the Scheme is adopted by the
                              Company

     "Associated Company"     the meaning given to that term in Section 416 of
                              the U.K. Income and Corporation Taxes Act 1988

     "Auditors"               the auditors for the time being of the Company
                              (acting as experts and not as arbitrators)

     "Board"                  the board of directors of the Company

     "Change of Control"      the meaning given to that term in Rule 6.1 of this
                              Scheme

     "Code"                   the U.S. Internal Revenue Code of 1986, as
                              amended, and regulations promulgated thereunder

     "Committee"              the committee established by the Board pursuant to
                              Rule 10.4

     "Company"                United Asset Management Corporation

     "Control"                the meaning given to that word by Section 840 of
                              the U.K. Income and Corporation Taxes Act 1988

     "Date of Grant"          the date on which an Option is, was or is to be
                              granted under the Scheme

     "Effective Date"         19 November 1998

     "Eligible Employee"      any employee of any Participating Company who is
                              subject to the income tax laws of the United
                              Kingdom and who is normally required to devote to
                              his duties not less than 20

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                              hours per week (excluding meal breaks) (in the
                              case of an employee who is also a director of any
                              Participating Company, 25 hours per week
                              (excluding meal breaks)) and is not precluded by
                              paragraph 8 of Schedule 9 from participating in
                              the Scheme

     "Event"                  the dissolution, liquidation, merger,
                              consolidation, or reorganization of the Company

     "Group"                  that group comprising all of the Participating
                              Companies

     "Incumbent Board"        the individuals who, as of the Effective Date,
                              constitute the Board

     "Issued Company Voting   the then issued voting securities of the Company
      Securities"             entitled to vote generally in the election of the
                              Board


     "Market Value"           on any day the closing sales price in U.S. Dollars
                              of a Share as derived from the consolidated tape
                              of The New York Stock Exchange for such day or, if
                              such day, as not a trading day or if no Shares
                              sold on such day, such closing sales price on the
                              next previous trading day on which a sale
                              occurred

     "Option"                 a right to purchase Shares under the Scheme

     "Option                  the certificate embodying an Option granted in
      Certificate"            accordance with these Rules

     "Option Holder"          an individual to whom an Option has been granted
                              pursuant to the Scheme

     "Participating           the Company and any other corporation which it
      Company"                Controls

     "Person"                 any individual, entity or group (within the
                              meaning of Section 13(d)(3) or 14(d)(2) of the Act

     "Plan"                   the United Asset Management Corporation 1994 Stock
                              Option Plan, of which this Scheme is an integral
                              part

     "Price"                  the price determined by the Committee in U.S.
                              Dollars at which each Share subject to an Option
                              may be acquired on the exercise of that Option,
                              which price shall be, subject to Rule 5, not less
                              than the higher of:

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                              (i)       the par value (if any) of a Share and

                              (ii)      the Market Value of a Share on the Date
                                        of Grant of that Option

     "Relevant Emoluments"    the meaning given to that term in sub-paragraph
                              (2) of paragraph 28 of Schedule 9 by virtue of
                              subparagraph (4) of that paragraph

     "Rules"                  the terms of the Scheme, as expressed herein and
                              as amended from time to time

     "Schedule 9"             Schedule 9 to the U.K. Income and Corporation
                              Taxes Act 1988

     "Scheme"                 this U.K. Subplan, as set forth in these Rules as
                              amended from time to time

     "Share"                  a share of common stock, U.S. $.01 par value, in
                              the capital of the Company which satisfies the
                              conditions specified in paragraphs 10 to 14
                              inclusive of Schedule 9 and which may either be an
                              authorized but unissued share or a treasury share

     "Sterling Value"         in respect of an Option, the sterling equivalent
                              of the appropriate Price, calculated by reference
                              to the U.S. Dollar/Sterling exchange rate
                              prevailing on the Date of Grant of that Option

     "Subplan A"              the portion of the Plan applicable to key
                              employees of, and non-employees (other than
                              directors of the Company) who provide important
                              services to, a Participating Company

     "Subplan C"              the portion of the Plan applicable to non-employee
                              directors of the Company

     "Subsisting Option"      an Option which has neither lapsed nor been
                              exercised or released, given up, or surrendered by
                              its holder

     "UK Subplan"             the portion of the Plan comprising the Scheme as
                              set forth in these Rules

     "Year of Assessment"     year beginning on any 6th April and ending on the
                              following 5th April

Where the context permits the singular shall include the plural and vice versa
and the masculine shall include the feminine. References to any Act or statute
shall include any statutory

                                       11

<PAGE>   13


modification, amendment or re-enactment thereof. Headings are for ease of
reference only and shall not affect the construction or interpretation of these
Rules.

2.   GRANT OF OPTION

2.1  Subject to the terms of these Rules, the Committee may at its absolute
     discretion, from time to time, grant Options to any Eligible Employees
     under the Scheme by issuing Option Certificates to them, complying with
     Rule 2.2 below.

2.2  Each Option Certificate shall be under seal and shall specify:

     i.        the Date of Grant of the relevant Option;

     ii.       the number of Shares for which the Option is granted (which shall
               not be so large that the grant of an Option for that number of
               Shares would cause the applicable limits specified in Rule 3 to
               be exceeded);

     iii.      the Price at which the relevant Shares can be acquired; and

     iv.       any conditions on the Option imposed by the Committee, including
               (without limitation) any vesting schedule.

     In addition each Option Certificate shall indicate that Options cannot be
     transferred, assigned or charged and that any purported transfer,
     assignment or charge shall cause the relevant Option to lapse forthwith.

     Each Option Certificate shall be accompanied by a "form of acceptance" (as
     described in Rule 4.3) which shall indicate that the Option to which it
     relates will automatically lapse if the Option holder does not sign and
     return such form to the Company within 3 months of the Date of Grant.

3.   LIMITATIONS

3.1  Subject to adjustment as provided in Rule 5, the aggregate number of
     Shares in respect of which Options may be granted under the Scheme on any
     Date of Grant or which may be issued and sold pursuant to such Options
     shall not exceed 6,985,367 Shares, less (i) any Shares then subject to any
     outstanding incentive stock option granted under Subplan A of the Plan or
     previously issued pursuant to any such incentive stock option and (ii) any
     shares that are then subject to any outstanding non-incentive stock option
     granted under Subplan A or Subplan C or previously issued pursuant to any
     such non-incentive stock option and are not reacquired shares (as described
     in the Preamble to the Plan). If any Option granted under the Plan shall
     lapse or shall be released, given up or surrendered without being fully
     exercised, the Shares which have not been purchased under the Option shall
     again become available for purposes of the Plan.

                                       12

<PAGE>   14


3.2  No Option shall be granted to an Eligible Employee if immediately following
     such grant he would hold Subsisting Options with an aggregate Sterling
     Value exceeding (pound)30,000.

     For the purposes of this Rule 3.2. Options shall include all Options
     granted under this Scheme and all options granted under any other scheme
     approved under Schedule 9 and established by the Company or any Associated
     Company.

3.3  The maximum number of Shares with respect to which any options may be
     granted under the Plan (including this UK Subplan) to any individual during
     any single calendar year shall be 100,000 Shares.

4.   EXERCISE OF OPTIONS

4.1  Any Option which has not lapsed may be exercised only after the earliest of
     the following events:

     i.        the first anniversary of the Date of Grant;

     ii.       the death of the Option holder;

     iii.      the Option holder ceasing to be an employee of any Participating
               Company by reason of injury, disability, redundancy or retirement
               or, at the discretion of the Committee, for any other reason;

     iv.       a Change of Control of the Company, but only in respect of an
               Option granted after April 1, 1999.

     Provided always that when granting an Option the Committee may provide that
     the Option or any part of it shall not become exercisable under sub Rules
     4.1 (i), (ii) or (iii) above until after such time(s) as the Committee
     determine and any such restriction on the Option's exercisability shall be
     set forth in the Option Certificate for that Option. For the avoidance of
     doubt, once an Option has become exercisable under Rule 4.1 (iv), it shall
     be exercisable in full.

4.2  Once an Option has become exercisable under Rule 4.1 above, it may be
     exercised either in whole or in part at any time unless or until it shall
     lapse under Rule 4.3 below, but subject in all cases to Rule 7 below.

4.3  An Option shall lapse on the earliest of the following events:

     i.        the expiry of three months from the Date of Grant, unless the
               Option holder has previously given notice to the Company of his
               acceptance of the Scheme's Rules using the form of acceptance
               supplied to him with the relevant Option Certificate;

                                       13

<PAGE>   15


     ii.       subject to a shorter period specified in the Option Certificate,
               the tenth anniversary of the Date of Grant;

     iii.      subject to a shorter period specified in the Option Certificate,
               the first anniversary of the Option holder's death;

     iv.       the Option holder ceasing to be an employee of any Participating
               Company by reason of gross misconduct;

     v.        subject to a shorter period specified in the Option Certificate,
               the expiry of three months after the date on which the Option
               holder ceases to be an employee of any Participating Company
               otherwise than by reason of death or gross misconduct in
               circumstances in which sub-clause (iv) applies;

     vi.       the Option holder being adjudicated bankrupt; and

     vii.      the first date upon which the Option holder purports to transfer,
               assign or charge the Option.

5.   VARIATION OF SHARE CAPITAL

     In the event of any capitalization or rights issue or any stock split or
     stock dividend or any consolidation, sub-division or reduction of capital
     by the Company, the number of Shares subject to any Option and the Price
     payable for each of those Shares shall be adjusted in such manner as the
     Auditors confirm to be fair and reasonable provided that:

     i.        the aggregate amount payable on the exercise of any Option in
               full is not increased;

     ii.       the Price of a Share is not reduced below its par value if any;

     iii.      no adjustments shall be made without the prior approval of the
               Board of Inland Revenue; and

     iv.       following the adjustment the Shares continue to satisfy the
               conditions specified in paragraphs 10 to 14 inclusive of Schedule
               9.

6.   CHANGE OF CONTROL

6.1  A Change of Control shall be the occurrence of any of the following events:

     i.        STOCK TRANSFER OF 20% OR MORE

               the acquisition by a Person of beneficial ownership (within the
               meaning of Rule 13d-3 promulgated under the Act) of 20 percent or
               more of either (a) the then issued Shares of the Company or (b)
               the combined voting power of the Issued

                                       14

<PAGE>   16


               Company Voting Securities; provided, however, that no change in
               such beneficial ownership percentage that results solely from a
               change in the aggregate number of outstanding Shares or Issued
               Company Voting Securities shall constitute a Change of Control;
               provided further, however, that the following acquisitions shall
               not constitute a Change of Control: (A) any acquisition directly
               from the Company (excluding an acquisition by virtue of the
               exercise of a conversion privilege); (B) any acquisition by the
               Company or any Associated Company; (C) any acquisition by any
               employee benefit plan (or related trust) sponsored or maintained
               by the Company or any Associated Company; or (D) any acquisition
               by any corporation pursuant to a consolidation or merger, if,
               following such consolidation or merger, the conditions described
               in clauses (a), (b), and (c) of Rule 6.1(iii) below are
               satisfied; or

     ii.       CHANGE IN INCUMBENT BOARD OF 50% OR MORE

               the Incumbent Board ceasing for any reason to constitute at least
               a majority of the Board; provided, however, that any individual
               becoming a director subsequent to the Effective Date whose
               election, or nomination for election by the Company's
               shareholders, was approved by a vote or resolution of at least a
               majority of the directors then comprising the Incumbent Board
               shall be considered as though such individual were a member of
               the Incumbent Board, but excluding, for this purpose, any such
               individual whose initial assumption of office occurs as a result
               of either an actual or threatened election contest (as such terms
               are used in Rule 14a-11 of Regulation 14A promulgated under the
               Act) or other actual or threatened solicitation of proxies or
               consents by or on behalf of a Person other than the Board; or

     iii.      MERGER WITHOUT CONTINUITY OF OWNERSHIP IN EXCESS OF 60%

               the adoption by the Board of a resolution approving an agreement
               of consolidation of the Company with or merger of the Company
               into another corporation or business entity in each case, unless,
               following such consolidation or merger, (a) more than 60 percent
               of, respectively, the then issued shares of common stock of the
               corporation resulting from such consolidation or merger and/or
               the combined voting power of the then issued voting securities of
               such corporation or business entity entitled to vote generally in
               the election of directors (or other persons having the general
               power to direct the affairs of such entity) is then beneficially
               owned, directly or indirectly, by all or substantially all of the
               individuals and entities who were the beneficial owners,
               respectively, of the Shares and Issued Company Voting Securities
               immediately prior to such consolidation or merger in
               substantially the same proportions as their ownership,
               immediately prior to such consolidation or merger, (b) no Person
               (excluding the Company, any employee benefit plan (or related
               trust) of the Company or such corporation or other business
               entity resulting from such consolidation or merger and any Person
               beneficially owning, immediately prior to such consolidation or
               merger, directly or indirectly, 35 percent or more of the

                                       15

<PAGE>   17


               Shares and/or Issued Company Voting Securities, as the case may
               be) beneficially owns, directly or indirectly, 35 percent or more
               of, respectively, the then issued shares of common stock of the
               corporation resulting from such consolidation or merger or the
               combined voting power of the then outstanding voting securities
               of such corporation or business entity entitled to vote generally
               in the election of its directors (or other persons having the
               general power to direct the affairs of such entity) and (c) at
               least a majority of the members of the board of directors (or
               other group of persons having the general power to direct the
               affairs of the corporation or other business entity) resulting
               from such consolidation or merger were members of the Incumbent
               Board at the time of the execution of the initial agreement
               providing for such consolidation or merger; provided that any
               right which shall vest by reason of the action of the Board
               pursuant to this paragraph (iii) shall be divested, with respect
               to any such right not already exercised upon (A) the rejection of
               such agreement of consolidation or merger by the shareholders of
               the Company or (B) its abandonment by either party thereto in
               accordance with its terms; or

     iv.       SALE OF ASSETS OR DISSOLUTION

               the adoption by the requisite majority of the whole Board, or by
               the holders of such majority of stock of the Company as is
               required by law or by the certificate of incorporation or by-laws
               of the Company as then in effect, of a resolution or consent
               authorizing (a) the dissolution of the Company or (b) the sale or
               other disposition of all or substantially all of the assets of
               the Company, other than to a corporation or other business entity
               with respect to which, following such sale or other disposition,
               (A) more than 60 percent of, respectively, the then issued shares
               of common stock of such corporation and/or the combined voting
               power of the issued voting securities of such corporation or
               other business entity entitled to vote generally in the election
               of directors (or other persons having the general power to direct
               the affairs of such entity) is then beneficially owned, directly
               or indirectly, by all or substantially all of the individuals and
               entities who were the beneficial owners, respectively, of the
               Shares and/or Issued Company Voting Securities immediately prior
               to such sale or other disposition in substantially the same
               proportions as their ownership, immediately prior to such sale or
               other disposition, of the Shares and/or Issued Company Voting
               Securities, as the case may be, (B) no Person (excluding the
               Company and any employee benefit plan (or related trust) of the
               Company or such corporation or other business entity and any
               Person beneficially owning, immediately prior to such sale or
               other disposition, directly or indirectly, 35 per cent or more of
               the Shares and/or Issued Company Voting Securities, as the case
               may be) beneficially owns, directly or indirectly, 35 percent or
               more of, respectively, the then issued shares of common stock of
               such corporation and/or the combined power of the then
               outstanding voting securities of such corporation or other
               business entity entitled to vote generally in the election of
               directors (or other persons having the general power to direct
               the affairs of such entity) and (C) at least a majority of the
               members of the board of directors (or other group of

                                       16

<PAGE>   18


               persons having the general power to direct the affairs of such
               corporation or other entity) were members of the Incumbent Board
               at the time of the execution of the initial agreement or action
               of the Board providing for such sale or other disposition of
               assets of the Company; provided that any right which shall vest
               by reason of the action of the Board or the stockholders pursuant
               to this paragraph (iv) shall be divested, with respect to any
               such right not already exercised, upon the abandonment by the
               Company of such dissolution, or such sale or other disposition of
               assets, as the case may be.

6.2  In the event of a Change of Control of the Company, notwithstanding any
     decision of the Board restricting the Option's exercisability under Rule
     4.1, all Options shall be exercisable in full or in part at the Option
     holder's discretion provided that one of the events referred to in Rule
     4.1(i) to (iv) has occurred.

6.3  Notwithstanding Rule 4.1, after a Change of Control, and upon the
     adoption of a plan for an Event, the Board may elect to terminate each
     Subsisting Option. If the Board so elects, such Option shall terminate as
     of the effective date of the Event, but the Board shall suspend the
     exercise of all Subsisting Options a reasonable time prior to the Event,
     giving each Option holder not less than fourteen days written notice of the
     date of suspension, prior to which an Option holder may purchase in whole
     or in part the Shares available to him as of the date of receipt of the
     notice. If the Event is not consummated, the suspension shall be removed
     and all Options shall continue in full force and effect, subject to the
     terms of their respective Option Certificates.

6.4  For the avoidance of doubt, nothing in this Rule 6 shall entitle an Option
     holder to exercise an Option which has previously lapsed.

7.   MANNER OF EXERCISE OF OPTIONS

7.1  No Option may be exercised by an individual at any time when he is
     precluded by paragraph 8 of Schedule 9 from participating in the Scheme.

7.2  An Option shall be exercised by the Option holder, or as the case may
     be his personal representative, giving notice to the Company in writing of
     the number of Shares in respect of which he wishes to exercise the Option
     and making arrangements reasonably acceptable to the Committee for payment
     of the appropriate amount, and submitting the relevant Option Certificate.
     Any such notice shall be effective on the date of its receipt by the
     Company.

7.3  Shares shall be allocated and issued pursuant to a notice of exercise
     within 30 days of the date of exercise.

8.   RIGHTS ATTACHING TO SHARES

     All Shares allocated pursuant to the exercise of an Option shall rank pari
     passu in all respects with all other Shares in issue at the date of such
     allocation.

                                       17

<PAGE>   19


9.   AVAILABILITY OF SHARES

     The Company shall at all times procure that it can secure the issue or the
     transfer of sufficient Shares to permit the exercise of all Subsisting
     Options.

10.  LOSS OF OFFICE

     If any Option holder shall cease to be an employee of a Participating
     Company within the Group for any reason, he shall not be entitled by way of
     compensation for loss of office or otherwise howsoever to any sum or other
     benefit to compensate him for any loss of any right under the Scheme, and
     in returning the form of acceptance referred to in Rule 4.3 he shall be
     deemed to have agreed to this.

11.  ADMINISTRATION AND AMENDMENT

11.1 No member of the Committee or the Board shall be held liable for any action
     or determination made in good faith with respect to the Plan, the UK
     Subplan, these Rules or any Option granted hereunder.

11.2 The cost of establishing and operating the Scheme shall be borne by the
     Participating Companies in such proportions as the Board shall determine.

11.3 The Board may from time to time suspend or terminate the Plan and/or the UK
     Subplan or amend these Rules or the form of Option Certificate, provided
     that:

     i.        no such action may, without approval or ratification by the
               Company's shareholders, increase the maximum number of Shares
               reserved under the UK Subplan (except as provided in Rule 5) or
               under the Plan (except as otherwise expressly provided in the
               Plan), alter the class or classes of employees eligible for
               Options, or make any other such change which, pursuant to Section
               16(b) of the Act and the rules and regulations promulgated
               thereunder, requires action by the Company's shareholders;

     ii.       except as provided in Rule 11.5, no such action may detrimentally
               affect an Option holder as regards an Option granted prior to the
               taking of such action; and

     iii.      no amendment to these Rules shall have effect until approved by
               the Board of the Inland Revenue.

11.4 The Scheme shall be administered by the Committee, the members of which
     shall be appointed by and shall serve at the pleasure of the Board (subject
     to the restrictions of this Rule 11.4). Notwithstanding the foregoing,
     until and unless the Board shall have constituted the Committee pursuant to
     this Rule 10.4, the committee serving from time to time as administrator of
     the Plan generally shall also serve as the Committee for purposes

                                       18

<PAGE>   20


     of the UK Subplan. Actions taken by a majority of the members present at
     any meeting of the Committee at which a quorum is present, and any acts
     approved in writing by all members of the Committee without a meeting,
     shall constitute the acts of the Committee. The Committee shall have all
     powers of administration granted under these Rules, except such powers as
     are expressly reserved to the Board. The Committee is authorized to
     interpret these Rules and, subject to the provisions of Rule 11.3, to
     prescribe, amend, and rescind rules and regulations relating thereto. The
     Committee is further authorized. subject to the express provisions of the
     Plan and these Rules, to alter or amend the form of Option Certificate
     pursuant to which Options may be granted under the Scheme from time to time
     and to make all determinations necessary or advisable in the administration
     of the Scheme. The interpretation and administration by the Committee of
     any provisions of the Plan and the UK Subplan, including these Rules, and
     any Option Certificate issued pursuant to the Scheme shall be final,
     binding and conclusive on all persons having any interest therein.

11.5 Any notice or communication to be given by or on behalf of the Company
     to any Eligible Employee may be given by personal delivery or by sending
     the same by ordinary post to his last known address in which case it shall
     be deemed to have been received on the day after it was posted. Any notice,
     document, option, share certificate or other communication sent by post
     shall be sent at the risk of the Eligible Employee involved.

11.6 Unless otherwise provided any notice or other communication to be given
     by an Eligible Employee to the Company shall be regarded as having been
     properly given if sent or delivered to the company secretary of the
     Participating Company by whom he is employed at that company's registered
     office, any such communication being effective only upon receipt.

11.7 The Scheme shall at all times be read in accordance with the provisions
     of the U.K. Income and Corporation Taxes Act 1988 and insofar as any of its
     Rules shall be inconsistent with any of the said provisions and/or with any
     requirements of the Board of Inland Revenue necessary for its approval or
     continued approval under the said Act they shall be deemed automatically
     varied or deleted in such a way as to ensure compliance with the same.


                                       19


<PAGE>   21



          SUBPLAN C--NON-EMPLOYEE ("ELIGIBLE") DIRECTOR PORTION OF THE
          ------------------------------------------------------------
                   AMENDED AND RESTATED 1994 STOCK OPTION PLAN
                   -------------------------------------------
                [AS FURTHER AMENDED AND RESTATED MARCH 31, 1999]
                ------------------------------------------------


1.   PURPOSE OF SUBPLAN C

     The purpose of this Subplan C is to grant options to purchase shares of the
common stock, $.01 par value (the "Common Stock"), of United Asset Management
Corporation (the "Company") to Eligible Directors (as defined in Section 4 of
this Subplan) of the Company at market value on the date of grant, and to permit
the granting of stock options to Eligible Directors at an exercise price less
than market value at the date of grant as an alternative to the payment of
Directors' fees in cash. The Company believes that the granting of such options
will serve to enhance the Company's ability to attract and retain the services
of such persons, to provide additional incentives to them and to encourage the
highest level of performance by them by offering them a proprietary interest in
the Company's success. The Company also believes that the Plan will encourage
directors to make greater equity investment in the Company, more closely
aligning the interests of the directors and the stockholders.

2.   SHARES RESERVED UNDER SUBPLAN C

     Subject to the adjustment provided in Section 8, the aggregate number of
shares of Common Stock which may be issued and sold pursuant to options granted
under this Subplan C of the Plan shall not exceed 800,000 shares (or, if less,
the then remaining aggregate number of shares determined in accordance with the
Preamble to the Plan), which may be either authorized but unissued shares or
treasury shares. If any option granted under the Plan shall terminate or expire
without being fully exercised, the shares which have not been purchased will
again become available for purposes of the Plan.

3.   ADMINISTRATION

     This Subplan C shall be interpreted and administered by a committee (the
"Committee") consisting of not less than three (3) members of the Board of
Directors of the Company (the "Board") appointed pursuant to Section 3 of
Subplan A of the Plan. The interpretation and administration by the Committee of
any provisions of the Plan and any option granted thereunder shall be final and
conclusive on all persons having any interest therein.

     No members of the Committee or the Board shall be held liable for any
action or determination made in good faith with respect to the Plan or any
option granted thereunder.

4.   OPTION GRANTS

     "Eligible Directors" shall mean directors of the Company who are directors
on the date of grant and who are not officers or employees of the Company. All
options granted under this Subplan C shall be non-incentive stock options within
the meaning of Section 422 of the Internal Revenue Code of 1986, as amended (the
"Code").

                                       20

<PAGE>   22


     (a)  REGULAR OPTIONS

               Each Eligible Director who is such on the 30th day following the
          date on which each Annual Meeting of the Stockholders of the Company
          (the "Annual Meeting") is held during the term of the Plan shall on
          such 30th day be granted a stock option to purchase 14,000 shares of
          Common Stock. Each such option is defined herein as a "Regular
          Option."

               The date of grant of an option to an Eligible Director under this
          Subplan C shall be the applicable day referred to immediately above.

     (b)  DISCOUNTED OPTIONS

               (i)       Subject to such other rules as the Committee may adopt
          from time to time, during the term of the Plan, options to purchase
          Common Stock at a discount from fair market value on the date of grant
          ("Discounted Options") shall be granted to any Eligible Director who,
          no later than June 30, with respect to the six-month period following
          such date, and no later than December 31, with respect to the
          six-month period following such date (each six month period, a
          "Semi-Annual Period"), has filed with the Company an irrevocable
          election to receive a stock option in lieu of all or a specified
          portion (expressed in terms of a percentage of the Semi-Annual Fee) of
          the Semi-Annual Fee (as defined in Subsection 4(b) (iii)) earned or
          expected to be earned by such Director for the Semi-Annual Period
          specified in the election.

               (ii)      Discounted Options shall be granted to an electing
          Eligible Director on the first day (July 1 or January 1) of each
          applicable Semi-Annual Period.

               A separate election must be made for each Semi-Annual Period,
          although a Director may specify that a particular election shall apply
          to future Semi-Annual Periods unless amended or revoked; provided,
          however, that no amendment or revocation may be made with respect to a
          Semi-Annual Period after the applicable election date for such
          Semi-Annual Period. The Director shall not be entitled to receive in
          cash any portion of the Semi-Annual Fee for which an election has been
          made to receive an option.

               (iii)     Option Formula. The number of shares of Common Stock
          subject to each Discounted Option granted to any Eligible Director for
          a Semi-Annual Period shall be equal to the nearest number of whole
          shares of Common Stock, with cash payment for fractional shares,
          determined in accordance with the following formula:

                  Semi-Annual Fee          =      Number of Shares
             -----------------------
             Fair Market Value minus
             Discounted Option Price

                                       21


<PAGE>   23


     "Discounted Option Price" and "Fair Market Value" shall be defined as set
forth in Section 5 below. "Semi-Annual Fee" shall mean the quarterly retainer
fees which the Director will be entitled to receive during a Semi-Annual Period
for serving as a Director pursuant to the policy in effect for each year during
the term of the Plan, but expressly excluding fees paid for attendance at or
participation in meetings of the Board or any committee thereof; provided,
however, that if a Director elects to receive a stock option in lieu of only a
portion of the Semi-Annual Fee, the Semi-Annual Fee for purposes of the
foregoing formula shall equal the portion of the Semi-Annual Fee so elected. For
purposes of this Subplan C, "Semi-Annual Fee" shall also not include expenses
reimbursed by the Company for attendance at or participation in meetings of the
Board or any committee of the Board or fees for any other services to be
provided to the Company.

5.   OPTION PRICE

     (a)  REGULAR OPTION

               The price per share at which each Regular Option granted under
          this Subplan C to an Eligible Director may be exercised ("Regular
          Option Price") shall be the fair market value of the Common Stock as
          determined by the closing sales price of such Common Stock on the
          consolidated tape of the principal exchange on which such Common Stock
          is traded on the date of grant, or if there are no sales on such date,
          on the trading day next preceding the date of grant on which a sale
          took place, or, if the Common Stock is not so traded, then as
          determined by a principal market maker for such Common Stock selected
          by the Committee ("Fair Market Value").

     (b)  DISCOUNTED STOCK OPTIONS

               The price per share at which each Discounted Option granted under
          this Subplan C to an Eligible Director may be exercised (the
          "Discounted Option Price," the Regular Option Price and the Discounted
          Option Price being sometimes hereinafter referred to as the "Option
          Price") shall be seventy-five percent (75%) of the Fair Market Value
          of the Common Stock on the date the Discounted Option is granted.

     (c)       In no event shall the Option Price per share for any option under
          this Subplan C be less than the par value per share.

6.   TERMS OF GRANT

     Each option granted under this Subplan C shall be evidenced by and subject
to the terms and conditions of an Option Grant attached hereto as Exhibit A.
Each Option Grant executed and delivered to an Eligible Director shall contain
the following terms and conditions. Each option shall expire five years from the
date of grant of such option, and shall be exercisable in full beginning on or
after the date which is six months after the date of grant thereof; provided,
however, that any option granted between March 31, 1999 and August 31, 1999,
inclusive, shall be exercisable in full beginning on or after the date on which
the Option Grant representing such option is delivered to the optionee. Each
Eligible Director to whom an option is granted may

                                       22

<PAGE>   24


exercise such option from time to time, in whole or in part, during the period
that it is exercisable, by payment of the Option Price of each share purchased.
The Option Price of each share purchased shall be paid in cash, or by delivery
or deemed delivery of other shares of the Company's Common Stock owned by the
Eligible Director with an aggregate Fair Market Value equal to the product of
the Option Price multiplied by the number of the shares to be purchased, or by
withholding by the Company of the number of shares of its Common Stock otherwise
issuable upon exercise of the installment with an aggregate Fair Market Value
equal to the product of the Option Price multiplied by the number of the shares
(including such withheld shares) to be purchased, or by delivery of irrevocable
instructions to a broker promptly to pay to the Company the exercise price of
the shares to be purchased, or in any combination of the forms of payment. A
deemed delivery of shares shall mean the offset by the Company of a number of
shares to be purchased against an equal number of shares of the Company's Common
Stock owned by the Eligible Director. If, however, the applicable Committee
established pursuant to Section 3 of this Subplan C determines in good faith
that an exercise of an option through the delivery or deemed delivery or
withholding of shares of the Company's Common Stock or through delivery of
irrevocable instructions to a broker is not in the best interest of the Company,
the Committee may withhold the right to so exercise the option and require
payment of the purchase price in cash.

     The shares of Common Stock issued upon exercise of an option granted under
this Subplan C will be acquired for investment and not with a view to
distribution thereof unless there shall be an effective registration statement
under the Securities Act of 1933, as amended (the "1933 Act"), with respect
thereto. In the event that the Company, upon the advice of counsel, deems it
necessary to list upon official notice of issuance shares to be issued pursuant
to the Plan on a national securities exchange or to register under the 1933 Act
or other applicable federal or state statute any shares to be issued pursuant to
the Plan, or to qualify any such shares for exemption from the registration
requirements of the 1933 Act under the Rules and Regulations of the Securities
and Exchange Commission or for similar exemption under state law, then the
Company shall notify each Eligible Director to that effect and no shares of
Common Stock subject to an option shall be issued until such registration,
listing or exemption has been obtained. The Company shall make prompt
application for any such registration, listing or exemption pursuant to federal
or state law or rules of such securities exchange which it deems necessary and
shall make reasonable efforts to cause such registration, listing or exemption
to become and remain effective. Nothing in this Subplan C or in the Option Grant
will confer upon any Eligible Director the right to continue as a director of
the Company. The shares of Common Stock issued on exercise of the option shall
be subject to any restrictions on transfer then in effect pursuant to the
Certificate of Incorporation or Bylaws of the Company.

     Options granted under this Subplan C shall be transferable (subject to any
terms and conditions imposed by the Committee) by the optionee, either directly
or in trust, to one or more members of the optionee's family. Following any
transfer permitted pursuant to this paragraph, of which the optionee has
notified the Committee in writing, such option may be exercised by the
transferee(s), subject to all terms and conditions of the Option Grant. For
these purposes, the members of the optionee's family are only the optionee's:
(i) spouse; (ii) lineal descendants; (iii) lineal ancestors; and (iv) siblings
and spouses and children of such siblings.

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7.   TERMINATION OF DIRECTORSHIP

     An Eligible Director's right to participate in this Subplan C shall
automatically terminate if and when such Director becomes an employee of the
Company. Options granted to an Eligible Director shall cease to be exercisable 6
months after the date such Director ceases to be a director for any reason other
than death. If an Eligible Director ceases to be a director on account of his
death, any option previously granted to him, whether or not exercisable at the
date of death, may be exercised by his executor, administrator or the person or
persons to whom his rights under the option shall pass by will or the applicable
laws of descent and distribution, at any time within 12 months after the date of
death, but in no event after the expiration of the option.

8.   ADJUSTMENT OF SHARES RESERVED UNDER THE PLAN

     The aggregate number and kind of shares that may be issued under this
Subplan C, the maximum number of shares as to which options may be granted to
any individual and the Option Price per share shall be appropriately adjusted by
the Board in the event of any recapitalization, stock split, stock dividend,
combination of shares, or other similar change in the capitalization of the
Company, but no adjustment in the Option Price shall be made which would reduce
the Option Price per share to less than the par value per share.

9.   DISSOLUTION OR REORGANIZATION

     Prior to a dissolution, liquidation, merger, consolidation, or
reorganization of the Company (the "Event"), the Board may decide to terminate
each outstanding option. If the Board so decides, such option shall terminate as
of the effective date of the Event, but the Board shall suspend the exercise of
all outstanding options a reasonable time prior to the Event, giving each
optionee not less than fourteen days written notice of the date of suspension,
prior to which an optionee may purchase in whole or in part the shares available
to him as of the date of receipt of the notice. If the Event is not consummated,
the suspension shall be removed and all options shall continue in full force and
effect subject to the terms of their respective Option Grants.

10.  AMENDMENT AND TERMINATION OF SUBPLAN C

     The Board may amend, suspend, or terminate this Subplan C, including the
form of Option Grant incorporated herein by reference. No such action, however,
may, without approval or ratification by the shareholders, increase the maximum
number of shares reserved under this Subplan C except as provided in Section 8,
alter the class or classes of individuals eligible for options, or make any
other change which, pursuant to the Code or regulations thereunder or Section
16(b) of the Securities Exchange Act of 1934 and the rules and regulations
promulgated thereunder, requires action by the shareholders. No such action may,
without the consent of the holder of the option, alter or impair any option
previously granted.


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