MERCANTILE BANCORPORATION INC
8-K, 1996-11-06
NATIONAL COMMERCIAL BANKS
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                        SECURITIES AND EXCHANGE COMMISSION

                              WASHINGTON, D.C. 20549

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

                                     FORM 8-K


                                  CURRENT REPORT
                      PURSUANT TO SECTION 13 OR 15(d) OF THE
                    SECURITIES EXCHANGE ACT OF 1934, AS AMENDED



         Date of Report (Date of earliest event reported): October 27, 1996 


                          MERCANTILE BANCORPORATION INC.
              ------------------------------------------------------
              (Exact name of registrant as specified in its charter)




                Missouri                  1-11792          43-0951744
         ------------------------      ------------   -------------------
         (State of Incorporation)      (Commission       (IRS Employer
                                       File Number)   Identification No.) 




                P.O. Box 524, St. Louis, Missouri                63166-0524
         -----------------------------------------------         ----------
         (Address of principal executive offices)                 Zip Code 



                                  (314) 425-2525                           
                  ---------------------------------------------------- 
                  (Registrant's telephone number, including area code) <PAGE>





                     INFORMATION TO BE INCLUDED IN THE REPORT


         ITEM 5.   OTHER EVENTS.

              On October 27, 1996, Mercantile Bancorporation, a corporation
         organized and existing under the laws of the State of Missouri
         ("Mercantile"), and Mark Twain Bancshares, Inc., a corporation
         organized and existing under the laws of the State of Missouri
         ("Bancshares"), and each registered as a bank holding company un-
         der the Bank Holding Company Act of 1956, as amended, entered into
         an Agreement and Plan of Reorganization (the "Merger Agreement"),
         pursuant to which Bancshares will be merged with Ameribanc, Inc.,
         a Missouri corporation and a wholly owned subsidiary of Mercantile
         (the "Merger").  The Executive Committee of the Board of Directors
         of Mercantile and the Board of Directors of Bancshares approved
         the Merger at their meetings held on October 23 and October 27,
         1996, respectively.

              In accordance with the terms of the Merger Agreement, (i)
         each share of Bancshares common stock, par value $1.25 per share
         ("Bancshares Common Stock"), outstanding immediately prior to the
         effective time of the Merger (the "Effective Time") will be con-
         verted into the right to receive 0.952 of a share (the "Exchange
         Ratio") of Mercantile common stock, par value $5.00 per share
         ("Mercantile Common Stock"), and the associated preferred share
         purchase rights under Mercantile's Rights Agreement, dated May 23,
         1988.

              The Merger is intended to constitute a tax-free reorganiza-
         tion under the Internal Revenue Code of 1986, as amended, and to
         be accounted for as a pooling of interests.

              Consummation of the Merger is subject to various conditions,
         including:  (i) receipt of approval by the shareholders of each of
         Mercantile, Ameribanc, Inc. and Bancshares of appropriate matters
         relating to the Merger Agreement and the Merger; (ii) receipt of
         requisite regulatory approvals from the Board of Governors of the
         Federal Reserve System and other federal and state regulatory
         authorities as necessary; (iii) receipt of an opinion of counsel
         as to the tax treatment of certain aspects of the Merger; (iv)
         registration of the shares of Mercantile Common Stock to be issued
         in the Merger under the Securities Act of 1933, as amended (the
         "1933 Act") and all applicable state securities laws; and (v) sat-
         isfaction of certain other conditions.  Certain directors and
         officers of Bancshares, who in the aggregate have voting power
         over approximately 14.9% of the outstanding shares of Bancshares
         Common Stock, based upon 16,384,722 share of Bancshares Common
         Stock outstanding as of September 30, 1996, as represented by
         Bancshares, have agreed with Mercantile to vote all such shares of
         Bancshares Common Stock to approve the Merger and not to sell any
         of such shares other than pursuant to the Merger without
         Mercantile's consent.  <PAGE>





              The Merger Agreement and the transactions contemplated
         thereby will be submitted for approval at meetings of the share-
         holders of each of Bancshares and Mercantile.  Prior to such meet-
         ings, Mercantile will file a registration statement with the Secu-
         rities and Exchange Commission registering under the Securities
         Act of 1933, as amended, the Mercantile stock to be issued in the
         Merger.  Such shares of Mercantile stock will be offered to Banc-
         shares shareholders pursuant to a prospectus that will also serve
         as a joint proxy statement for the shareholders' meetings.

              The preceding description of the Merger Agreement is quali-
         fied in its entirety by reference to the copy of the Merger Agree-
         ment included as Exhibit 2.1 hereto and which is hereby incorpo-
         rated herein by reference.

              In connection with the Merger Agreement, Mercantile and Banc-
         shares entered into a Stock Option Agreement, dated October 27,
         1996 (the "Stock Option Agreement"), pursuant to which Bancshares
         granted to Mercantile an irrevocable option to purchase, under
         certain circumstances, up to 3,261,522 authorized and unissued
         shares of Bancshares Common Stock at a price, subject to certain
         adjustments, of $42.375 per share (the "Mercantile Option").  The
         Mercantile Option, if exercised, would equal, before giving effect
         to the exercise of the Mercantile Option, 19.9% of the total
         number of shares of Bancshares Common Stock outstanding.  The
         Mercantile Option was granted by Bancshares as a condition and
         inducement to Mercantile's willingness to enter into the Merger
         Agreement.  Under certain circumstances, Bancshares may be
         required to repurchase the Mercantile Option or the shares ac-
         quired pursuant to the exercise of the Mercantile Option.

              The preceding description of the Stock Option Agreement is
         qualified in its entirety by reference to the copy of the Stock
         Option Agreement included as Exhibit 2.2 hereto and which is
         hereby incorporated herein by reference.

         ITEM 7.   FINANCIAL STATEMENTS AND EXHIBITS

              (c)  Exhibits
                   --------

         Exhibit   Description
         -------   -----------

         2.1       Agreement and Plan of Merger, dated as of October 27,
                   1996, by and between Mercantile Bancorporation Inc.,
                   Ameribanc, Inc. and Mark Twain Bancshares, Inc.

         2.2       Stock Option Agreement, dated as of October 27, 1996, by
                   and between Mercantile Bancorporation Inc., as grantee,
                   and Mark Twain Bancshares, Inc., as issuer.<PAGE>





         99        Text of joint press release, dated October 28, 1996, is-
                   sued by Mercantile Bancorporation Inc. and Mark Twain
                   Bancshares, Inc.<PAGE>






                                    SIGNATURES



         Pursuant to the requirements of the Securities Exchange Act of
         1934, as amended, the Registrant has duly caused this report to be
         signed on its behalf by the undersigned hereunto duly authorized. 




                                          MERCANTILE BANCORPORATION INC.
                                          (Registrant)
                                          ------------

                                          By:  /s/ Jon W. Bilstrom         
                                               -----------------------
                                               Jon W. Bilstrom
                                               General Counsel and
                                                 Secretary





         Dated: November 6, 1996<PAGE>






                                   EXHIBIT INDEX

         Exhibit No.    Description of Exhibit
         -----------    ----------------------

         2.1            Agreement and Plan of Merger, dated as of October
                        27, 1996, by and between Mercantile Bancorporation
                        Inc., Ameribanc, Inc. and Mark Twain Bancshares,
                        Inc.

         2.2            Stock Option Agreement, dated as of October 27,
                        1996, by and between Mercantile Bancorporation
                        Inc., as grantee, and Mark Twain Bancshares, Inc.,
                        as issuer.

         99             Text of joint press release, dated October 28,
                        1996, issued by Mercantile Bancorporation Inc. and
                        Mark Twain Bancshares, Inc.             









                                                          EXHIBIT 2.1



                                                                      
                                                                      






                      AGREEMENT AND PLAN OF REORGANIZATION


                                    between


                        MERCANTILE BANCORPORATION INC.,


                                AMERIBANC, INC.


                                      and


                          MARK TWAIN BANCSHARES, INC.



                                                      




                             Dated October 27, 1996



                                                                      
                                                                      <PAGE>







                      AGREEMENT AND PLAN OF REORGANIZATION


                   This AGREEMENT AND PLAN OF REORGANIZATION (this

         "Agreement") is made and entered into on October 27, 1996 by

         and between MERCANTILE BANCORPORATION INC., a Missouri cor-

         poration ("Mercantile"), Ameribanc, Inc., a Missouri corpora-

         tion and a wholly owned subsidiary of Mercantile ("Merger

         Sub") and Mark Twain Bancshares, Inc., a Missouri corporation

         (together with its predecessors, "Bancshares").


                              W I T N E S S E T H:


                   WHEREAS, Mercantile is a registered bank holding

         company under the Bank Holding Company Act of 1956, as amen-

         ded (the "Holding Company Act"); and


                   WHEREAS, Bancshares is a registered bank holding

         company under the Holding Company Act; and 


                   WHEREAS, the Board of Directors of Bancshares and the

         Executive Committee of the Board of Directors of Mercantile

         have approved the merger (the "Merger") of Bancshares with and

         into Merger Sub pursuant to the terms and subject to the condi-

         tions of this Agreement; and


                   WHEREAS, for federal income tax purposes, it is in-

         tended that the Merger shall qualify as a reorganization within<PAGE>







         the meaning of Section 368(a) of the Internal Revenue Code of

         1986, as amended (the "Internal Revenue Code"); and


                   WHEREAS, as a condition to, and concurrently with

         the execution of this Agreement, Mercantile and certain

         shareholders of Bancshares are entering into Support Agree-

         ments (the "Support Agreements") in the form attached hereto

         as Exhibit A; and


                   WHEREAS, as a condition to, and concurrently with the

         execution of this Agreement, Mercantile and Bancshares are en-

         tering into a stock option agreement (the "Stock Option Agree-

         ment") in the form attached hereto as Exhibit B; and


                   WHEREAS, the parties desire to provide for certain

         undertakings, conditions, representations, warranties and cov-

         enants in connection with the transactions contemplated by this

         Agreement.


                   NOW THEREFORE, in consideration of the premises and

         the representations, warranties and agreements herein con-

         tained, the parties agree as follows:



                                   ARTICLE I

                                   THE MERGER


                   1.01.  The Merger.  (a)  Subject to the terms and

         conditions of this Agreement, Bancshares shall be merged with


                                      -2-<PAGE>







         and into Merger Sub in accordance with The General and Busi-

         ness Corporation Law of Missouri (the "Missouri Act") and the

         separate corporate existence of Bancshares shall cease.  Mer-

         ger Sub shall be the surviving corporation of the Merger

         (sometimes referred to herein as the "Surviving Corporation")

         and shall continue to be governed by the laws of the State of

         Missouri.


                   1.02.  Closing.  The closing (the "Closing") of the

         Merger shall take place at 10:00 a.m., local time, on the

         date that the Effective Time (as defined in Section 1.03)

         occurs, or at such other time, and at such place, as Mercan-

         tile and Bancshares shall agree (the "Closing Date").


                   1.03.  Effective Time.  The Merger shall become

         effective on the date and at the time (the "Effective Time")

         on which appropriate documents in respect of the Merger are

         filed with the Secretary of State of the State of Missouri in

         such form as required by, and in accordance with, the rel-

         evant provisions of the Missouri Act.  Subject to the terms

         and conditions of this Agreement, the Effective Time shall

         occur on such date as Mercantile shall notify Bancshares in

         writing (such notice to be at least five business days in

         advance of the Effective Time) but (i) not earlier than the

         satisfaction of all conditions set forth in Section 6.01(a)

         and 6.01(b) (the "Approval Date") and (ii) subject to clause



                                      -3-<PAGE>







         (i), not later than the first business day of the first full

         calendar month commencing at least five business days after

         the Approval Date.  


                   1.04.  Additional Actions.  If, at any time after

         the Effective Time, Mercantile or the Surviving Corporation

         shall consider or be advised that any further deeds, assign-

         ments or assurances or any other acts are necessary or desir-

         able to (a) vest, perfect or confirm, of record or otherwise,

         in the Surviving Corporation its right, title or interest in,

         to or under any of the rights, properties or assets of Banc-

         shares or Merger Sub or (b) otherwise carry out the purposes

         of this Agreement, Bancshares and Merger Sub and each of

         their respective officers and directors, shall be deemed to

         have granted to the Surviving Corporation an irrevocable

         power of attorney to execute and deliver all such deeds, as-

         signments or assurances and to do all acts necessary or de-

         sirable to vest, perfect or confirm title and possession to

         such rights, properties or assets in the Surviving Corpora-

         tion and otherwise to carry out the purposes of this Agree-

         ment, and the officers and directors of the Surviving Corpo-

         ration are authorized in the name of Bancshares or otherwise

         to take any and all such action.


                   1.05.  Effect of Merger.  The Articles of Incorpo-

         ration and Bylaws of Merger Sub in effect immediately prior



                                      -4-<PAGE>







         to the Effective Time shall be the Articles of Incorporation

         and Bylaws of the Surviving Corporation following the Merger

         until otherwise amended or repealed.  At the Effective Time,

         the directors and officers of Merger Sub immediately prior to

         the Effective Time shall be directors and officers, respec-

         tively, of the Surviving Corporation following the Merger;

         such directors and officers shall hold office in accordance

         with the Surviving Corporation's Bylaws and applicable law.


                   1.06.  Conversion of Securities.  At the Effective

         Time, by virtue of the Merger and without any action on the

         part of Mercantile, Bancshares or the holder of any of the

         following securities:


                    (i)   Each share of the common stock, par value

         $.01 per share, of Merger Sub that is issued and outstanding

         immediately prior to the Effective Time shall remain out-

         standing and shall be unchanged after the Merger and shall

         thereafter constitute all of the issued and outstanding capi-

         tal stock of the Surviving Corporation; and


                   (ii)  Each share of the common stock, par value

         $1.25 per share ("Bancshares Common Stock"), of Bancshares

         issued and outstanding immediately prior to the Effective

         Time, other than any Dissenting Shares (as defined in Section

         1.08), shall cease to be outstanding and shall be converted




                                      -5-<PAGE>







         into and become the right to receive .952 (the "Exchange Ra-

         tio") of a share of common stock, par value $5.00 per share

         ("Mercantile Common Stock"), of Mercantile and the associated

         Rights under the Mercantile Rights Agreement as those terms

         are defined in Section 3.02; provided, however, that any

         shares of Bancshares Common Stock held by Bancshares or any

         of its wholly owned Subsidiaries (as defined in Rule 1-02 of

         Regulation S-X promulgated by the Securities and Exchange

         Commission (the "SEC")), or Mercantile or any of its wholly

         owned Subsidiaries, in each case other than in a fiduciary

         capacity or as a result of debts previously contracted, shall

         be cancelled and shall not represent capital stock of the

         Surviving Corporation and shall not be exchanged for shares

         of Mercantile Common Stock.


                   1.07.  Exchange Procedures.  (a)  Mercantile shall

         designate a person reasonably acceptable to Bancshares to act

         as Exchange Agent hereunder (the "Exchange Agent").  At or

         prior to the Effective Time, Mercantile shall deposit, or

         cause to be deposited, with the Exchange Agent, for the ben-

         efit of the holders of record of certificates representing

         shares of Bancshares Common Stock (the "Certificates"), for

         exchange in accordance with this Article I, certificates rep-

         resenting the Mercantile Common Stock and cash in lieu of any

         fractional shares issuable pursuant to Section 1.06(ii) (such

         cash and certificates for Mercantile Common Stock, together


                                      -6-<PAGE>







         with any dividends or distributions with respect thereto,

         being hereinafter referred to as the "Exchange Fund") in ex-

         change for outstanding Bancshares Common Stock.  As soon as

         practicable after the Effective Time holders of Certificates

         shall be instructed to tender such Certificates to the Ex-

         change Agent pursuant to a letter of transmittal that the

         Exchange Agent shall deliver or cause to be delivered to such

         holders.  Such letters of transmittal shall specify that risk

         of loss and title to Certificates shall pass only upon deliv-

         ery of such Certificates to the Exchange Agent. 


                   (b)  Subject to Section 1.09, after the Effective

         Time, each holder of a Certificate that surrenders such Cer-

         tificate with a properly completed transmittal letter to the

         Exchange Agent will be entitled to (i) a certificate or cer-

         tificates representing the number of full shares of Mercan-

         tile Common Stock into which the Certificate so surrendered

         shall have been converted pursuant to this Agreement and any

         distribution theretofore declared and not yet paid with re-

         spect to such shares of Mercantile Common Stock, without in-

         terest, and (ii) a check representing the amount of any cash

         in lieu of fractional shares which such holder has the right

         to receive in respect of the Certificate surrendered pursuant

         to this Article I.  






                                      -7-<PAGE>







                   (c)  The Exchange Agent shall accept Certificates

         upon compliance with such reasonable terms and conditions as

         the Exchange Agent may impose to effect an orderly exchange

         thereof in accordance with customary exchange practices.

         Certificates shall be appropriately endorsed or accompanied

         by such instruments of transfer as the Exchange Agent may

         reasonably require in accordance with customary exchange

         practices.


                   (d)  Each outstanding Certificate shall until duly

         surrendered to Mercantile or the Exchange Agent be deemed to

         evidence ownership of the consideration into which the stock

         previously represented by such Certificate shall have been

         converted pursuant to this Agreement.  


                   (e)  After the Effective Time, holders of Certifi-

         cates shall cease to have rights with respect to the stock

         previously represented by such Certificates, and their sole

         rights shall be to exchange such Certificates for the con-

         sideration provided for in this Agreement.  After the Effec-

         tive Time, there shall be no further transfer on the records

         of Bancshares of Certificates, and if such Certificates are

         presented to Bancshares for transfer, they shall be cancelled

         against delivery of the consideration provided therefor in

         this Agreement.  No dividends declared will be remitted to

         any person entitled to receive Mercantile Common Stock under



                                      -8-<PAGE>







         this Agreement until such person surrenders the Certificate

         representing the right to receive such Mercantile Common

         Stock, at which time such dividends shall be remitted to such

         person, without interest and less any taxes that may have

         been imposed thereon.  A restrictive legend will be placed

         on, and stop transfer instructions shall be given to the Ex-

         change Agent and Mercantile's transfer agent in respect of,

         certificates representing Mercantile Common Stock issued in

         exchange for certificates surrendered for exchange by any

         person constituting an "affiliate" of Bancshares for purposes

         of Rule 145 of the Securities Act of 1933, as amended (to-

         gether with the rules and regulations thereunder, the "Secu-

         rities Act"), and identified in the letter or letters re-

         ferred to in Section 5.05 or otherwise identified as such by

         Mercantile, until Mercantile has received a written agreement

         from such person in the form attached as Exhibit C.  Mercan-

         tile and the Exchange Agent shall be entitled to rely upon

         the stock transfer books of Bancshares to establish the iden-

         tity of those persons entitled to receive consideration

         specified in this Agreement, which books shall be conclusive

         with respect thereto.  In the event of a dispute with respect

         to ownership of stock represented by any Certificate, Mercan-

         tile and the Exchange Agent shall be entitled to deposit any







                                      -9-<PAGE>







         consideration represented thereby in escrow with an indepen-

         dent third party and thereafter be relieved with respect to

         any claims thereto.


                   If any certificate representing shares of Mercantile

         Common Stock is to be issued in a name other than that in which

         the Certificate surrendered in exchange therefor is registered,

         it shall be a condition of the issuance thereof that the Cer-

         tificate so surrendered shall be properly endorsed (or other-

         wise in proper form for transfer) and that the person request-

         ing such exchange shall pay to the Exchange Agent in advance

         any transfer or other taxes required by reason of the issuance

         of a certificate representing shares of Mercantile Common Stock

         in any name other than that of the registered holder of the

         Certificate surrendered, or required for any other reason, or

         shall establish to the satisfaction of the Exchange Agent that

         such tax has been paid or is not payable.


                   Any portion of the Exchange Fund that remains un-

         claimed by the stockholders of Bancshares for 12 months after

         the Effective Time shall be paid to Mercantile.  Notwithstand-

         ing the foregoing, none of Bancshares, Mercantile, the Exchange

         Agent or any other person shall be liable to any former holder

         of shares of Bancshares Common Stock for any amount delivered

         in good faith to a public official pursuant to applicable aban-

         doned property, escheat or similar laws.



                                     -10-<PAGE>








                   In the event any Certificate shall have been lost,

         stolen or destroyed, upon the making of an affidavit of that

         fact by the person claiming such Certificate to be lost, stolen

         or destroyed and, if reasonably required by Mercantile, the

         posting by such person of a bond in such amount as Mercantile

         may determine is reasonably necessary as indemnity against any

         claim that may be made against it with respect to such Cer-

         tificate, the Exchange Agent will issue in exchange for such

         lost, stolen or destroyed Certificate the shares of Mercantile

         Common Stock, dividends and any cash in lieu of fractional

         shares deliverable in respect thereof pursuant to this Agree-

         ment.


                   1.08.  Dissenting Shares.  (a)  "Dissenting Shares"

         means any shares held by any holder who becomes entitled to

         payment of the fair value of such shares under the Missouri

         Act.  Any holders of Dissenting Shares shall be entitled to

         payment for such shares only to the extent permitted by and

         in accordance with the provisions of the Missouri Act; pro-

         vided, however, that if, in accordance with the Missouri Act,

         any holder of Dissenting Shares shall forfeit such right to

         payment of the fair value of such shares, such shares shall

         thereupon be deemed to have been converted into and to have

         become exchangeable for, as of the Effective Time, the right

         to receive the consideration provided in this Article I.



                                     -11-<PAGE>








                   (b)  Bancshares shall give Mercantile (i) prompt

         notice of any written objections to the Merger and any writ-

         ten demands for the payment of the fair value of any shares,

         withdrawals of such demands, and any other instruments served

         pursuant to Section 351.455 of the Missouri Act received by

         Bancshares and (ii) the opportunity to participate in all

         negotiations and proceedings with respect to such demands

         under the Missouri Act.  Bancshares shall not voluntarily

         make any payment with respect to any demands for payment of

         fair value and shall not, except with the prior written con-

         sent of Mercantile, settle or offer to settle any such de-

         mands.


                   1.09.  No Fractional Shares.  Notwithstanding any

         other provision of this Agreement, neither certificates nor

         scrip for fractional shares of Mercantile Common Stock shall

         be issued in the Merger.  Each holder who otherwise would

         have been entitled to a fraction of a share of Mercantile

         Common Stock shall receive in lieu thereof cash (without in-

         terest) in an amount determined by multiplying the fractional

         share interest to which such holder would otherwise be en-

         titled by the Closing Price per share of Mercantile Common

         Stock on the last business day preceding the Effective Time.

         With respect to a share of stock, "Closing Price" shall mean:

         the closing price as reported on the Consolidated Tape (as



                                     -12-<PAGE>







         reported in The Wall Street Journal or in the absence there-

         of, by any other authoritative source).  No such holder shall

         be entitled to dividends, voting rights or any other rights

         in respect of any fractional share.


                   1.10.  Anti-Dilution Adjustments.  If prior to the

         Effective Time Mercantile shall declare a stock dividend or

         make distributions upon or subdivide, split up, reclassify,

         combine or make other similar change to Mercantile Common

         Stock, exchange Mercantile Common Stock for a different num-

         ber or kind of shares or securities or declare a dividend or

         make a distribution on Mercantile Common Stock in any secu-

         rity convertible into Mercantile Common Stock, or is involved

         in any transaction resulting in any of the foregoing (includ-

         ing any exchange of Mercantile Common Stock for a different

         number or kind of shares or securities), appropriate and pro-

         portionate adjustment or adjustments will be made to the Ex-

         change Ratio.


                   1.11.  Reservation of Right to Revise Transaction.

         Mercantile may at any time change the method of effecting the

         reorganization of the parties (including without limitation

         the provisions of this Article I) if and to the extent it

         deems such change to be desirable, including without limita-

         tion to provide for a merger of Bancshares directly into Mer-

         cantile, in which Mercantile is the surviving corporation, or



                                     -13-<PAGE>







         a merger of Merger Sub into Bancshares, in which Bancshares

         is the surviving corporation, provided, however, that no such

         change shall (A) alter or change the amount or kind of con-

         sideration to be issued to holders of Bancshares Common Stock

         as provided for in this Agreement (the "Merger Consider-

         ation"), (B) adversely affect the tax treatment to Banc-

         shares' stockholders as a result of receiving the Merger Con-

         sideration or (C) materially impede or delay receipt of any

         approval referred to in Section 6.01(b) or the consummation

         of the transactions contemplated by this Agreement.


                                   ARTICLE II

            REPRESENTATIONS, WARRANTIES AND COVENANTS OF BANCSHARES


                   Bancshares represents and warrants to and covenants

         with Mercantile as follows:


                   2.01.  Organization and Authority.  Bancshares is a

         corporation duly organized, validly existing and in good

         standing under the laws of the State of Missouri, is duly

         qualified to do business and is in good standing in all ju-

         risdictions where its ownership or leasing of property or the

         conduct of its business requires it to be so qualified, ex-

         cept where the failure to be so qualified would not have a

         material adverse effect on the financial condition, results

         of operations or business (collectively, the "Condition") of

         Bancshares and its Subsidiaries, taken as a whole, and has


                                     -14-<PAGE>







         corporate power and authority to own its properties and as-

         sets and to carry on its business as it is now being con-

         ducted.  Bancshares is registered as a bank holding company

         with the Board of Governors of the Federal Reserve System

         (the "Board") under the Holding Company Act.  True and com-

         plete copies of the Restated Articles of Incorporation and

         the Restated Bylaws of Bancshares and, to the extent reques-

         ted in writing by Mercantile, of the articles of incorpo-

         ration and bylaws of the Bancshares Subsidiaries (as defined

         in Section 2.02), each as in effect on the date of this Ag-

         reement, have been provided to Mercantile.


                   2.02  Subsidiaries.  Schedule 2.02 sets forth a

         complete and correct list of all of Bancshares' Subsidiaries

         (each a "Bancshares Subsidiary" and collectively the "Banc-

         shares Subsidiaries"), all outstanding Equity Securities of

         each of which, except as set forth on Schedule 2.02, are

         owned directly or indirectly by Bancshares.  "Equity Securi-

         ties" of an issuer means capital stock or other equity secu-

         rities of such issuer, options, warrants, scrip, rights to

         subscribe to, calls or commitments of any character what-

         soever relating to, or securities or rights convertible into,

         shares of any capital stock or other Equity Securities of

         such issuer, or contracts, commitments, understandings or

         arrangements by which such issuer is or may become bound to

         issue additional shares of its capital stock or other Equity


                                     -15-<PAGE>







         Securities of such issuer, or options, warrants, scrip or

         rights to purchase, acquire, subscribe to, calls on or com-

         mitments for, or stock appreciation or similar rights in re-

         spect of, any shares of its capital stock or other Equity

         Securities.  All of the outstanding shares of capital stock

         of the Bancshares Subsidiaries are validly issued, fully paid

         and nonassessable, and, except as set forth on Schedule 2.02,

         those shares owned directly or indirectly by Bancshares are

         owned free and clear of any lien, claim, charge, option, en-

         cumbrance, agreement, mortgage, pledge, security interest or

         restriction (a "Lien") with respect thereto.  Each of the

         Bancshares Subsidiaries is a corporation, bank, trust company

         or other entity duly incorporated or organized, validly ex-

         isting, and in good standing under the laws of its juris-

         diction of incorporation or organization, and has corporate

         power and authority to own or lease its properties and assets

         and to carry on its business as it is now being conducted.

         Each of the Bancshares Subsidiaries is duly qualified to do

         business in each jurisdiction where its ownership or leasing

         of property or the conduct of its business requires it to be

         so qualified, except where the failure to so qualify would

         not have a material adverse effect on the Condition of Banc-

         shares and its Subsidiaries, taken as a whole.  Except as set

         forth on Schedule 2.02, Bancshares does not own beneficially,

         directly or indirectly, any shares of any class of Equity



                                     -16-<PAGE>







         Securities or similar interests of any corporation, bank,

         business trust, association or similar organization except in

         each case in a fiduciary capacity or as a result of debts

         previously contracted.  As of the date hereof, Bancshares'

         bank Subsidiaries (the "Banks") consist of four state banking

         associations chartered under the laws of the states of Mis-

         souri and Illinois.  The deposits of each of the Banks are

         insured by the Bank Insurance Fund ("BIF") or, to the extent

         transferred to a Bank by the Resolution Trust Corporation or

         any savings association, by the Savings Association Insurance

         Fund of the Federal Deposit Insurance Corporation (the

         "FDIC").  The aggregate "adjusted attributable deposit

         amount" (as defined in 12 U.S.C. Section 1815) of the Banks

         is zero.  None of the Banks identified as such on Schedule

         2.02 are members of the Federal Reserve System.  Except as

         set forth on Schedule 2.02, neither Bancshares nor any Banc-

         shares Subsidiary holds any interest in a partnership or

         joint venture of any kind.


                   2.03.  Capitalization.  The authorized capital

         stock of Bancshares consists of (i) 30,000,000 shares of

         Bancshares Common Stock, of which, as of September 30, 1996,

         16,384,722 shares were issued and outstanding and (ii)

         500,000 shares of preferred stock, par value $25.00 ("Banc-

         shares Preferred Stock"), of which none are outstanding.  As

         of September 30, 1996, Bancshares had reserved (i) 1,029,566


                                     -17-<PAGE>







         shares of Bancshares Common Stock for issuance under Banc-

         shares' stock option and incentive plans, a list of which is

         set forth on Schedule 2.03 (the "Bancshares Stock Plans"),

         pursuant to which options ("Bancshares Stock Options") cover-

         ing 1,029,566 shares of Bancshares Common Stock are outstand-

         ing as of the date hereof, (ii) 148,090 shares of Bancshares

         Common Stock for issuance upon conversion of Bancshares' 7%

         convertible subordinated capital notes due 1999 (the "Banc-

         shares Convertible Notes") and (iii) approximately 261,479

         (subject to adjustment) shares of Bancshares Common Stock for

         issuance upon the acquisition of First City Bancshares, Inc.

         pursuant to an agreement dated July 17, 1996 (the "First City

         Acquisition Agreement").  Since September 30, 1996, no Equity

         Securities of Bancshares have been issued other than shares

         of Bancshares Common Stock which may have been issued upon

         the exercise of Bancshares Stock Options, the conversion of

         Bancshares Convertible Notes, as contemplated by the First

         City Acquisition Agreement or as may be issued pursuant to

         Bancshares' Savings Challenge Plan.  Except as set forth in

         this Section, there are no other Equity Securities of Banc-

         shares outstanding.  All of the issued and outstanding shares

         of Bancshares Common Stock are validly issued, fully paid,

         and nonassessable, and have not been issued in violation of

         any preemptive right of any stockholder of Bancshares.  Banc-

         shares maintains a dividend reinvestment plan.



                                     -18-<PAGE>








                   2.04.  Authorization.  (a)  Bancshares has the cor-

         porate power and authority to enter into this Agreement and,

         subject to the approval of this Agreement by the stockholders

         of Bancshares, to carry out its obligations hereunder.  The

         only stockholder vote required for Bancshares to approve this

         Agreement is the affirmative vote of the holders of at least

         two thirds of the outstanding shares of Bancshares Common

         Stock entitled to vote on the Agreement.  The execution, de-

         livery and performance of this Agreement by Bancshares and

         the consummation by Bancshares of the transactions contem-

         plated hereby have been duly authorized by the Board of Di-

         rectors of Bancshares.  Subject to approval by the stock-

         holders of Bancshares, this Agreement is a valid and binding

         obligation of Bancshares enforceable against Bancshares in

         accordance with its terms.


                   (b)  Except as set forth on Schedule 2.04B, neither

         the execution, delivery nor performance by Bancshares of this

         Agreement, nor the consummation by Bancshares of the trans-

         actions contemplated hereby, nor compliance by Bancshares

         with any of the provisions hereof, will (i) violate, conflict

         with, or result in a breach of any provisions of, or consti-

         tute a default (or an event which, with notice or lapse of

         time or both, would constitute a default) under, or result in

         the termination of, or accelerate the performance required



                                     -19-<PAGE>







         by, or result in a right of termination or acceleration of,

         or result in the creation of, any Lien upon any of the mate-

         rial properties or assets of Bancshares or any Bancshares

         Subsidiary under any of the terms, conditions or provisions

         of (x) its articles or certificate of incorporation or bylaws

         or (y) any material note, bond, mortgage, indenture, deed of

         trust, license, lease, agreement or other instrument or obli-

         gation to which Bancshares or any Bancshares Subsidiary is a

         party or by which it may be bound, or to which Bancshares or

         any Bancshares Subsidiary or any of the material properties

         or assets of Bancshares or any Bancshares Subsidiary may be

         subject other than those as to which any such violation, con-

         flict, breach, event, termination, acceleration or creation

         would not have a material adverse effect on the Condition of

         Bancshares and the Bancshares Subsidiaries, taken as a whole,

         or (ii) subject to compliance with the statutes and regula-

         tions referred to in paragraph (c) of this Section 2.04, to

         the best knowledge of Bancshares, violate any judgment, rul-

         ing, order, writ, injunction, decree, statute, rule or regu-

         lation applicable to Bancshares or any Bancshares Subsidiary

         or any of their respective material properties or assets.


                   (c)  Other than in connection or in compliance with

         the provisions of the Missouri Act, the Securities Act, the

         Securities Exchange Act of 1934 and the rules and regulations

         thereunder (the "Exchange Act"), the Investment Company Act


                                     -20-<PAGE>







         of 1940, as amended, and the rules and regulations thereunder

         (the "Investment Company Act"), the securities or blue sky

         laws of the various states or filings, consents, reviews,

         authorizations, approvals or exemptions required under the

         Holding Company Act, and the Hart-Scott-Rodino Antitrust Im-

         provements Act of 1976 (the "HSR Act"), or any required ap-

         provals of or filings with the Missouri Division of Finance

         and Division of Insurance and the state banking regulators of

         the states of Illinois and Kansas (the "State Bank Regula-

         tors") or filings required with respect to any Transfer Taxes

         described in Section 5.18, no notice to, filing with, exemp-

         tion or review by, or authorization, consent or approval of,

         any public body or authority is necessary for the consumma-

         tion by Bancshares of the transactions contemplated by this

         Agreement.


                   2.05.  Bancshares Financial Statements.  The con-

         solidated and parent-company only condensed balance sheets of

         Bancshares and its Subsidiaries as of December 31, 1995, 1994

         and 1993 and related consolidated and condensed statements of

         income, cash flows and changes in shareholders' equity for

         each of the three years in the three-year period ended Decem-

         ber 31, 1995, together with the notes thereto, audited by

         Ernst & Young LLP and included in an annual report on Form

         10-K as filed with the SEC, and the unaudited consolidated

         balance sheets of Bancshares and its Subsidiaries as of March


                                     -21-<PAGE>







         31 and June 30, 1996 and the related unaudited consolidated

         statements of income and cash flows for the periods then

         ended included in quarterly reports on Form 10-Q (each a

         "Bancshares Form 10-Q") as filed with the SEC (collectively,

         the "Bancshares Financial Statements"), have been prepared in

         accordance with generally accepted accounting principles in

         the United States applied on a consistent basis ("GAAP"),

         present fairly the consolidated financial position of Banc-

         shares and its Subsidiaries at the dates and the consolidated

         results of operations, cash flows and changes in stockhold-

         ers' equity of Bancshares and its Subsidiaries for the peri-

         ods stated therein and are derived from the books and records

         of Bancshares and its Subsidiaries, which are complete and

         accurate in all material respects and have been maintained in

         all material respects in accordance with applicable laws and

         regulations.  Neither Bancshares nor any of its Subsidiaries

         has any contingent liabilities that are material, either in-

         dividually or in the aggregate, to Bancshares and its Subsid-

         iaries, taken as a whole, other than those reflected in the

         Bancshares Financial Statements or disclosed in the footnotes

         thereto, reflected in the Bancshares SEC Reports (as herein-

         after defined), arising pursuant to agreements in the ordi-

         nary course of business or set forth on Schedule 2.05.


                   2.06.  Bancshares Reports.  Since January 1, 1993,

         each of Bancshares and the Bancshares Subsidiaries has filed


                                     -22-<PAGE>







         all material reports, registrations and statements, together

         with any required material amendments thereto, that it was

         required to file with (i) the SEC, including, but not limited

         to, Forms 10-K, Forms 10-Q, Forms 8-K and proxy statements,

         (ii) the Board, (iii) the FDIC, (iv) the State Bank Regula-

         tors, and (v) except in the case of this clause (v) where the

         failure to file such report, registration or statement, ei-

         ther individually or in the aggregate, will not have a mate-

         rial adverse effect on the Condition of Bancshares and its

         Subsidiaries, taken as a whole, any other federal, state,

         municipal, local or foreign government, securities, banking,

         savings and loan, insurance and other governmental or regula-

         tory authority and the agencies and staffs thereof (the en-

         tities in the foregoing clauses (i) through (v) being re-

         ferred to herein collectively as the "Regulatory Authorities"

         and individually as a "Regulatory Authority").  All such re-

         ports and statements filed with the SEC are collectively re-

         ferred to herein as "Bancshares SEC Reports" and all such

         reports and statements filed with any Regulatory Authority

         are collectively referred to herein as "Bancshares Reports."

         As of its respective date, each Bancshares Report complied in

         all material respects with all the rules and regulations pro-

         mulgated by the applicable Regulatory Authority and did not

         contain any untrue statement of a material fact or omit to





                                     -23-<PAGE>







         state a material fact required to be stated therein or neces-

         sary in order to make the statements therein, in light of the

         circumstances under which they were made, not misleading.


                   2.07.  Properties and Leases.  Except as may be

         reflected in the Bancshares Financial Statements, except for

         any Lien for current taxes not yet delinquent and except with

         respect to assets classified as real estate owned, Bancshares

         and its Subsidiaries have good title free and clear of any

         Lien (except for Liens that do not materially interfere with

         the use of, or materially affect the value of, the property

         subject to such Lien) to all the real and personal property

         reflected in Bancshares' consolidated balance sheet as of

         June 30, 1996 included in the most recent Bancshares Form

         10-Q and, in each case, all real and personal property ac-

         quired since such date, except such real and personal prop-

         erty as has been disposed of in the ordinary course of busi-

         ness and real and personal property that is not material,

         either individually or in the aggregate, to Bancshares and

         its Subsidiaries, taken as a whole.  All leases material to

         Bancshares and the Bancshares Subsidiaries, taken as a whole,

         pursuant to which Bancshares or any Bancshares Subsidiary, as

         lessee, leases real or personal property, are valid and

         effective in accordance with their respective terms, and

         there is not, under any of such leases, any material existing

         default by Bancshares or any Bancshares Subsidiary or any

         event which, with


                                     -24-<PAGE>







         notice or lapse of time or both, would constitute such a ma-

         terial default.  Substantially all of Bancshares' and Banc-

         shares Subsidiaries' buildings, structures and equipment in

         regular use have been well maintained and are in good and

         serviceable condition, normal wear and tear excepted.


                   2.08.  Taxes.  Except as previously disclosed by

         Bancshares to Mercantile, (i) Bancshares and each Bancshares

         Subsidiary have timely filed or will timely file (including

         extensions) all material tax returns required to be filed at

         or prior to the Closing Date except where failures to so

         timely file would not, individually or in the aggregate, rea-

         sonably be expected to have a material adverse effect on the

         Condition of Bancshares and the Bancshares Subsidiaries,

         taken as a whole ("Bancshares Returns"); (ii) each of Banc-

         shares and its Subsidiaries has paid, or set up adequate re-

         serves on the Bancshares Financial Statements for the payment

         of, all taxes required to be paid in respect of the periods

         covered by the Bancshares Financial Statements and has paid

         or set up adequate reserves on the most recent financial

         statements Bancshares has filed under the Exchange Act for

         the payment of, all taxes anticipated to be payable in re-

         spect of the periods covered by such financial statements, in

         each case except where failures to so pay or set up adequate

         reserves would not, individually or in the aggregate, reason-

         ably be expected to have a material adverse effect on the


                                     -25-<PAGE>







         Condition of Bancshares and the Bancshares Subsidiaries,

         taken as a whole; (iii) no material deficiencies for any tax,

         assessment or governmental charge have been proposed, as-

         serted or assessed in writing by any governmental or taxing

         authority against any of Bancshares or any Bancshares Subsid-

         iary which have not been settled or would not be covered by

         existing reserves; (iv) neither Bancshares nor any Bancshares

         Subsidiary is delinquent in the payment of any material tax,

         assessment or governmental charge shown to be due on any

         Bancshares Return (taking into account extensions properly

         obtained), and no waiver of the time to assess any tax

         granted in writing by Bancshares or any Bancshares Subsidiary

         is pending; (v) the federal and state income tax returns of

         Bancshares and the Bancshares Subsidiaries have been audited

         and settled by the Internal Revenue Service (the "IRS") or

         appropriate state tax authorities for all periods ended

         through December 31, 1992, or the period for assessment of

         taxes in respect of such periods has expired.  To the best

         knowledge of Bancshares, the representations set forth in the

         Bancshares Tax Certificate attached as Exhibit D to this

         Agreement, if made on the date hereof (assuming the Merger

         was consummated on the date hereof), would be true and cor-

         rect.







                                     -26-<PAGE>







                   2.09.  Material Adverse Change.  Since December 31,

         1995, there has been no material adverse change in the Con-

         dition of Bancshares and its Subsidiaries, taken as a whole,

         except (i) as may have resulted or may result from changes to

         laws and regulations or changes in economic conditions appli-

         cable to banking institutions generally or in general levels

         of interest rates affecting banking institutions generally

         and (ii) the costs incurred or to be incurred by Bancshares

         in connection with this Agreement, including costs incurred

         for investment banking, accounting and legal services.


                   2.10.  Commitments and Contracts.  (a)  Except as set

         forth on Schedule 2.10A, neither Bancshares nor any Bancshares

         Subsidiary is a party or subject to any of the following (whe-

         ther written or oral, express or implied):


                           (i)  any material agreement, arrangement or

                   commitment (A) not made in the ordinary course of

                   business or (B) pursuant to which Bancshares or any

                   of its Subsidiaries is or may become obligated to

                   invest in or contribute capital to any Bancshares

                   Subsidiary;


                          (ii)  any agreement, indenture or other in-

                   strument not disclosed in the Bancshares Financial

                   Statements relating to the borrowing of money by




                                     -27-<PAGE>







                   Bancshares or any Bancshares Subsidiary or the gua-

                   rantee by Bancshares or any Bancshares Subsidiary

                   of any such obligation (other than trade payables

                   or instruments related to transactions entered into

                   in the ordinary course of business by any Banc-

                   shares Subsidiary, such as deposits, Fed Funds bor-

                   rowings, hedges, swaps, repurchase agreements and

                   other ordinary course money market transactions);


                         (iii)  any contract, agreement or understand-

                   ing with any labor union or collective bargaining

                   organization relating to employees of Bancshares or

                   Bancshares Subsidiaries;


                          (iv)  any contract containing covenants

                   which materially limit the ability of Bancshares or

                   any Bancshares Subsidiary to compete in any line of

                   business or with any person or which involve any

                   restriction of the geographical area in which Banc-

                   shares or any Bancshares Subsidiary may carry on

                   its business, or which materially limits the method

                   by which Bancshares or any Bancshares Subsidiary

                   may carry on its business (other than as may be

                   required by law or any applicable Regulatory Au-

                   thority and other than with respect to any matter





                                     -28-<PAGE>







                   which is not material to Bancshares and its Subsid-

                   iaries, taken as a whole); 


                           (v)  any other contract or agreement which

                   is a "material contract" within the meaning of Item

                   601(b)(10) of Regulation S-K promulgated by the

                   SEC; or


                          (vi)  any lease with annual rental payments

                   aggregating $250,000 or more.


                   (b)  Neither Bancshares nor any Bancshares Subsidiary

         is in violation of its charter documents or bylaws or in de-

         fault under any material agreement, commitment, arrangement,

         lease, insurance policy, or other instrument, whether entered

         into in the ordinary course of business or otherwise and wheth-

         er written or oral, and there has not occurred any event that,

         with the lapse of time or giving of notice or both, would con-

         stitute such a default, except, in all cases, where such de-

         fault would not have a material adverse effect on the Condition

         of Bancshares and its Subsidiaries, taken as a whole.


                   2.11.  Litigation and Other Proceedings.  Except as

         set forth on Schedule 2.11, neither Bancshares nor any Banc-

         shares Subsidiary is a party to any pending or, to the best







                                     -29-<PAGE>







         knowledge of Bancshares, threatened claim, action, suit, in-

         vestigation or proceeding, or is subject to any order, judg-

         ment or decree, except for matters which, in the aggregate,

         will not have, or reasonably could not be expected to have, a

         material adverse effect on the Condition of Bancshares and

         its Subsidiaries, taken as a whole.  Without limiting the

         generality of the foregoing, as of the date of this Agree-

         ment, there are no actions, suits, or proceedings pending or,

         to the best knowledge of Bancshares, threatened against Banc-

         shares or any Bancshares Subsidiary or any of their respec-

         tive officers or directors by any stockholder of Bancshares

         or any Bancshares Subsidiary (or any former stockholder of

         Bancshares or any Bancshares Subsidiary) or involving claims

         under the Securities Act, the Exchange Act, the Community

         Reinvestment Act of 1977, as amended, or the fair lending

         laws or which purport or seek to enjoin or restrain the

         transactions contemplated by this Agreement.


                   2.12.  Insurance.  Each of Bancshares and its Sub-

         sidiaries has taken all requisite action (including without

         limitation the making of claims and the giving of notices)

         pursuant to its directors' and officers' liability insurance

         policy or policies in order to preserve all rights thereunder

         with respect to all matters (other than matters arising in

         connection with this Agreement and the transactions contem-

         plated hereby) occurring prior to the Effective Time that are


                                     -30-<PAGE>







         known to Bancshares, except for such matters which, individu-

         ally or in the aggregate, will not have and reasonably could

         not be expected to have a material adverse effect on the Con-

         dition of Bancshares and its Subsidiaries, taken as a whole.

         Promptly after the date hereof, Bancshares shall provide a

         list of all insurance policies maintained by or for the ben-

         efit of Bancshares or its Subsidiaries or their directors,

         officers, employees or agents.


                   2.13.  Compliance with Laws.  (a)  Bancshares and

         each of its Subsidiaries have all permits, licenses, authoriza-

         tions, orders and approvals of, and have made all filings, ap-

         plications and registrations with, all Regulatory Authorities

         that are required in order to permit them to own or lease their

         properties and assets and to carry on their business as pres-

         ently conducted, except where the failure to so have or make

         would not have a material adverse effect on the Condition of

         Bancshares and its Subsidiaries, taken as a whole; all such

         permits, licenses, certificates of authority, orders and ap-

         provals are in full force and effect and, to the best knowledge

         of Bancshares, no suspension or cancellation of any of them is

         threatened; and all such filings, applications and registra-

         tions are current.








                                     -31-<PAGE>







                   (b)  Except for failures to comply or defaults

         which individually or in the aggregate would not have a ma-

         terial adverse effect on the Condition of Bancshares and its

         Subsidiaries, taken as a whole, (i) each of Bancshares and

         its Subsidiaries has complied with all laws, regulations and

         orders (including without limitation zoning ordinances, buil-

         ding codes, the Employee Retirement Income Security Act of

         1974, as amended ("ERISA"), and securities, tax, environmen-

         tal, civil rights, and occupational health and safety laws

         and regulations and including without limitation in the case

         of any Bancshares Subsidiary that is a bank or savings as-

         sociation, banking organization, banking corporation or trust

         company, all statutes, rules, regulations and policy state-

         ments pertaining to the conduct of a banking, deposit-taking,

         lending or related business, or to the exercise of trust pow-

         ers) and governing instruments applicable to them and to the

         conduct of their business, and (ii) neither Bancshares nor

         any Bancshares Subsidiary is in default under, and no event

         has occurred which, with the lapse of time or notice or both,

         could result in the default under, the terms of any judgment,

         order, writ, decree, permit, or license of any Regulatory

         Authority or court, whether federal, state, municipal, or

         local and whether at law or in equity.  Except for liabili-

         ties which individually or in the aggregate would not have a

         material adverse effect on the Condition of Bancshares and



                                     -32-<PAGE>







         its Subsidiaries, taken as a whole, neither Bancshares nor

         any Bancshares Subsidiary is subject to or reasonably likely

         to incur a liability as a result of its ownership, operation,

         or use of any Property (as defined below) of Bancshares (whe-

         ther directly or, to the best knowledge of Bancshares, as a

         consequence of such Property being part of the investment

         portfolio of Bancshares or any Bancshares Subsidiary) (A)

         that is contaminated by or contains any hazardous waste,

         toxic substance, or related materials, including without

         limitation asbestos, PCBs, pesticides, herbicides, and any

         other substance or waste that is hazardous to human health or

         the environment (collectively, a "Toxic Substance"), or (B)

         on which any Toxic Substance has been stored, disposed of,

         placed, or used in the construction thereof.  "Property" of a

         person shall include all property (real or personal, tangible

         or intangible) owned or controlled by such person, including

         without limitation property under foreclosure, property held

         by such person or any Subsidiary of such person in its capa-

         city as a trustee and property in which any venture capital

         or similar unit of such person or any Subsidiary of such per-

         son has an interest.  As of the date of this Agreement, no

         claim, action, suit, or proceeding is pending against Banc-

         shares or any Bancshares Subsidiary relating to Property of

         Bancshares before any court or other Regulatory Authority or





                                     -33-<PAGE>







         arbitration tribunal relating to hazardous substances, pollu-

         tion or the environment, and there is no outstanding judg-

         ment, order, writ, injunction, decree, or award against or

         affecting Bancshares or any Bancshares Subsidiary with re-

         spect to the same.  Except for statutory or regulatory re-

         strictions of general application, no Regulatory Authority

         has placed any restriction on the business of Bancshares or

         any Bancshares Subsidiary which reasonably could be expected

         to have a material adverse effect on the Condition of Banc-

         shares and its Subsidiaries, taken as a whole.


                   (c)  From and after January 1, 1993, neither Banc-

         shares nor any Bancshares Subsidiary has received any notifica-

         tion or communication which has not been resolved from any Reg-

         ulatory Authority (i) asserting that Bancshares or any Banc-

         shares Subsidiary, is not in substantial compliance with any of

         the statutes, regulations or ordinances that such Regulatory

         Authority enforces, except with respect to matters which (A)

         are set forth on Schedule 2.13C or in any writing previously

         furnished to Mercantile or (B) reasonably could not be expected

         to have a material adverse effect on the Condition of Banc-

         shares and its Subsidiaries, taken as a whole, (ii) threatening

         to revoke any license, franchise, permit or governmental autho-

         rization that is material to the Condition of Bancshares and

         its Subsidiaries, taken as a whole, including without limita-

         tion such company's status as an insured depositary institution


                                     -34-<PAGE>







         under the Federal Deposit Insurance Act, or (iii) requiring or

         threatening to require Bancshares or any of its Subsidiaries,

         or indicating that Bancshares or any of its Subsidiaries may be

         required, to enter into a cease and desist order, agreement or

         memorandum of understanding or any other agreement restricting

         or limiting or purporting to direct, restrict or limit in any

         material manner the operations of Bancshares or any of its Sub-

         sidiaries, including without limitation any restriction on the

         payment of dividends.  No such cease and desist order, agree-

         ment or memorandum of understanding or other agreement is cur-

         rently in effect.


                   (d)  Neither Bancshares nor any Bancshares Subsid-

         iary is required by Section 32 of the Federal Deposit Insur-

         ance Act to give prior notice to any federal banking agency

         of the proposed addition of an individual to its board of

         directors or the employment of an individual as a senior ex-

         ecutive officer.


                   2.14.  Labor.  No work stoppage involving Bancshares

         or any Bancshares Subsidiary, is pending or, to the best knowl-

         edge of Bancshares, threatened which reasonably could be ex-

         pected to have a material adverse effect on the Condition of

         Bancshares and its Subsidiaries, taken as a whole.  Neither

         Bancshares nor any Bancshares Subsidiary is involved in, or, to

         the best knowledge of Bancshares, threatened with or affected



                                     -35-<PAGE>







         by, any labor dispute, arbitration, lawsuit or administrative

         proceeding which reasonably could be expected to have a mate-

         rial adverse affect on the Condition of Bancshares and its Sub-

         sidiaries, taken as a whole.  


                   2.15.  Material Interests of Certain Persons.  (a)

         Except as set forth in Bancshares' Proxy Statement for its

         1996 Annual Meeting of Stockholders, to the best knowledge of

         Bancshares, no officer or director of Bancshares or any Banc-

         shares Subsidiary, or any "associate" (as such term is de-

         fined in Rule 14a-1 under the Exchange Act) of any such of-

         ficer or director, has any material interest in any material

         contract or property (real or personal, tangible or intan-

         gible), used in, or pertaining to the business of, Bancshares

         or any Bancshares Subsidiary, which in the case of Bancshares

         is required to be disclosed by Item 404 of Regulation S-K

         promulgated by the SEC or in the case of any such Subsidiary

         would be required to be so disclosed if such Subsidiary had a

         class of securities registered under Section 12 of the Ex-

         change Act.  


                   (b)  Except as set forth in Bancshares' Proxy

         Statement for its 1996 Annual Meeting of Stockholders or on

         Schedule 2.15B, as of September 30, 1996, there are no loans

         from Bancshares or any Bancshares Subsidiary to any present





                                     -36-<PAGE>







         officer, director, employee or any associate or related in-

         terest of any such person which was or would be required un-

         der any rule or regulation to be approved by or reported to

         Bancshares' or Bancshares Subsidiary's Board of Directors

         ("Insider Loans"), and no Insider Loans in excess of $500,000

         have been made since September 30, 1996.  All outstanding

         Insider Loans from Bancshares or any Bancshares Subsidiary

         were approved by or reported to the appropriate board of di-

         rectors in accordance with applicable law and regulations.


                   2.16.  Allowance for Loan and Lease Losses.  The

         allowances for loan and lease losses contained in the Banc-

         shares Financial Statements were established in accordance

         with the past practices and experiences of Bancshares and its

         Subsidiaries.


                   2.17.  Employee Benefit Plans.  (a)  Except as set

         forth in Schedule 2.17A, neither Bancshares nor any Bancshares

         Subsidiary is a party to any existing employment, management,

         consulting, deferred compensation, change-in-control or other

         similar contract.  "Bancshares Employee Plans" means all pen-

         sion, retirement, supplemental retirement, savings, profit

         sharing, stock option, stock purchase, stock ownership, stock

         appreciation right, deferred compensation, consulting, bonus,

         medical, disability, workers' compensation, vacation, group





                                     -37-<PAGE>







         insurance, severance and other material employee benefit, in-

         centive and welfare policies, contracts, plans and arrange-

         ments, and all trust agreements related thereto, maintained

         (currently or at any time in the last five years) by or con-

         tributed to by Bancshares or any Bancshares Subsidiary in re-

         spect of any of the present or former directors, officers, or

         other employees of and/or consultants to Bancshares or any

         Bancshares Subsidiary.  Schedule 2.17A lists all Bancshares

         Employee Plans currently in effect.  Bancshares has furnished,

         or will furnish promptly after the date hereof, Mercantile with

         the following documents with respect to each Bancshares Em-

         ployee Plan:  (i) a true and complete copy of all written docu-

         ments comprising such Bancshares Employee Plan (including

         amendments and individual agreements relating thereto) or, if

         there is no such written document, an accurate and complete

         description of the Bancshares Employee Plan; (ii) the most re-

         cent Form 5500 or Form 5500-C (including all schedules

         thereto), if applicable; (iii) the most recent financial state-

         ments and actuarial reports, if any; (iv) the summary plan de-

         scription currently in effect and all material modifications

         thereof, if any; and (v) the most recent IRS determination let-

         ter, if any.  Without limiting the generality of the foregoing,









                                     -38-<PAGE>







         Bancshares has furnished Mercantile with true and complete cop-

         ies of each form of stock option grant or stock option agree-

         ment that is outstanding under any stock option plan of Banc-

         shares or any Bancshares Subsidiary.


                   (b)  Except as set forth in Schedule 2.17B, all

         Bancshares Employee Plans have been maintained and operated

         materially in accordance with their terms and with the mate-

         rial requirements of all applicable statutes, orders, rules

         and final regulations, including without limitation ERISA and

         the Internal Revenue Code.  All contributions required to be

         made to Bancshares Employee Plans have been made.


                   (c)  With respect to each of the Bancshares Em-

         ployee Plans which is a pension plan (as defined in Section

         3(2) of ERISA) (the "Pension Plans"), except as set forth in

         Schedule 2.17C:  (i) each Pension Plan which is intended to

         be "qualified" within the meaning of Section 401(a) of the

         Internal Revenue Code has been determined to be so qualified

         by the Internal Revenue Service and, to the knowledge of

         Bancshares, such determination letter may still be relied

         upon, and each related trust is exempt from taxation under

         Section 501(a) of the Internal Revenue Code; (ii) the actu-

         arial present value of accumulated plan benefits under each

         Pension Plan which is subject to Title IV of ERISA, valued

         using the assumptions in the most recent actuarial report,



                                     -39-<PAGE>







         did not, in each case, as of the last applicable annual valu-

         ation date, exceed the value of the assets of the Pension

         Plan allocable to such vested or accrued benefits; (iii) to

         the best knowledge of Bancshares, there has been no "prohib-

         ited transaction," as such term is defined in Section 4975 of

         the Internal Revenue Code or Section 406 of ERISA, which

         could subject any Pension Plan or associated trust, or the

         Bancshares or any Bancshares Subsidiary, to any material tax

         or penalty; (iv) except as set forth on Schedule 2.17C, no

         Pension Plan subject to Title IV of ERISA or any trust cre-

         ated thereunder has been terminated, nor have there been any

         "reportable events" (as that term is defined in Section 4043

         of ERISA) with respect to any Pension Plan for which the 30-

         day notice requirement has not been waived on or after Janu-

         ary 1, 1985; and (v) no Pension Plan or any trust created

         thereunder has incurred any "accumulated funding deficiency,"

         as such term is defined in Section 302 of ERISA (whether or

         not waived).  No Pension Plan is a "multiemployer plan" as

         that term is defined in Section 3(37) of ERISA or a "multiple

         employer pension plan" as described in Section 4063(a) of

         ERISA.


                   (d)  Except as set forth on Schedule 2.17D, neither

         Bancshares nor any Bancshares Subsidiary has any liability

         for any post-retirement health, medical or similar benefit of




                                     -40-<PAGE>







         any kind whatsoever, except as required by statute or regula-

         tion.


                   (e)  To the knowledge of Bancshares, neither Banc-

         shares nor any Bancshares Subsidiary has any material lia-

         bility under ERISA or the Internal Revenue Code as a result

         of its being a member of a group described in Sections

         414(b), (c), (m) or (o) of the Internal Revenue Code.


                   (f)  Except as set forth on Schedule 2.17F, neither

         the execution nor delivery of this Agreement, nor the con-

         summation of any of the transactions contemplated hereby,

         will (i) result in any material payment (including without

         limitation severance, unemployment compensation or golden

         parachute payment) becoming due to any director or employee

         of Bancshares or any Bancshares Subsidiary from any of such

         entities, (ii) materially increase any benefit otherwise pay-

         able under any of the Bancshares Employee Plans or (iii) re-

         sult in the acceleration of the time of payment of any such

         benefit.  No holder of an option to acquire stock of Banc-

         shares has or will have at any time through the Effective

         Time the right to receive any cash or other payment (other

         than the issuance of stock of Bancshares) in exchange for or

         with respect to all or any portion of such option.  No Banc-

         shares Employee Stock Option has an associated "re-load" fea-

         ture.



                                     -41-<PAGE>








                   2.18.  Conduct of Bancshares to Date.  From and

         after January 1, 1996 through the date of this Agreement,

         except as set forth on Schedule 2.18 or in Bancshares Finan-

         cial Statements or the Bancshares SEC Reports:  (i) Banc-

         shares and the Bancshares Subsidiaries have conducted their

         respective businesses in all material respects in the or-

         dinary and usual course consistent with past practices; (ii)

         neither Bancshares nor any Bancshares Subsidiary has incurred

         any material obligation or liability (absolute or contin-

         gent), except normal trade or business obligations or li-

         abilities incurred in the ordinary course of business, or

         subjected to Lien any of its assets or properties other than

         in the ordinary course of business consistent with past prac-

         tice; (iii) neither Bancshares nor any Bancshares Subsidiary

         has discharged or satisfied any material Lien or paid any

         material obligation or liability (absolute or contingent),

         other than in the ordinary course of business; (iv) neither

         Bancshares nor any Bancshares Subsidiary has sold, assigned,

         transferred, leased, exchanged, or otherwise disposed of any

         of its material properties or assets other than for a fair

         consideration in the ordinary course of business; (v) except

         as required by contract or law, neither Bancshares nor any

         Bancshares Subsidiary has (A) increased the rate of compensa-

         tion of, or paid any bonus to, any of its directors, offic-

         ers, or other employees, except merit or promotion increases


                                     -42-<PAGE>







         in accordance with existing policy, (B) entered into any new,

         or amended or supplemented any existing, employment, manage-

         ment, consulting, deferred compensation, severance, or other

         similar contract, (C) entered into, terminated, or substan-

         tially modified any of the Bancshares Employee Plans or (D)

         agreed to do any of the foregoing; (vi) neither Bancshares

         nor any Bancshares Subsidiary has suffered any material dam-

         age, destruction, or loss, whether as the result of fire,

         explosion, earthquake, accident, casualty, labor trouble,

         requisition, or taking of property by any Regulatory Author-

         ity, flood, windstorm, embargo, riot, act of God or the en-

         emy, or other casualty or event, and whether or not covered

         by insurance; and (vii) neither Bancshares nor any Bancshares

         Subsidiary has cancelled or compromised any debt, except for

         debts charged off or compromised in accordance with the past

         practice of Bancshares and its Subsidiaries.


                   2.19.  Proxy Statement, etc.  None of the informa-

         tion regarding Bancshares or any Bancshares Subsidiary sup-

         plied or to be supplied by Bancshares for inclusion or in-

         cluded in (i) the registration statement on Form S-4 to be

         filed with the SEC by Mercantile for the purpose of register-

         ing the shares of Mercantile Common Stock to be exchanged for

         shares of Bancshares Common Stock pursuant to the provisions

         of this Agreement (the "Registration Statement"), (ii) the

         proxy statement (the "Joint Proxy Statement") to be mailed to


                                     -43-<PAGE>







         stockholders of Mercantile and Bancshares in connection with

         the transactions contemplated by this Agreement or (iii) any

         other documents to be filed with any Regulatory Authority in

         connection with the transactions contemplated hereby will, at

         the respective times such documents are filed with any Regu-

         latory Authority and, in the case of the Registration State-

         ment, when it becomes effective and, with respect to the

         Joint Proxy Statement, when mailed, be false or misleading

         with respect to any material fact, or omit to state any mate-

         rial fact necessary in order to make the statements therein

         not misleading or, in the case of the Proxy Statement or any

         amendment thereof or supplement thereto, at the time of the

         meetings of stockholders referred to in Section 5.03 (the

         "Meetings"), be false or misleading with respect to any mate-

         rial fact, or omit to state any material fact necessary to

         correct any statement in any earlier communication with re-

         spect to the solicitation of any proxy for the Meetings.  All

         documents which Bancshares or any Bancshares Subsidiary is

         responsible for filing with any Regulatory Authority in con-

         nection with the Merger will comply as to form in all mate-

         rial respects with the provisions of applicable law.


                   2.20.  Registration Obligations.  Except as set

         forth on Schedule 2.20, neither Bancshares nor any Bancshares

         Subsidiary is under any obligation, contingent or otherwise,

         to register any of its securities under the Securities Act.


                                     -44-<PAGE>








                   2.21.  State Takeover Statutes.  The transactions

         contemplated by this Agreement are not subject to any appli-

         cable state takeover law under the laws of the State of Mis-

         souri or any other state applicable to Bancshares.


                   2.22.  Accounting, Tax and Regulatory Matters.

         Neither Bancshares nor any Bancshares Subsidiary has taken or

         agreed to take any action or has any knowledge of any fact or

         circumstance that would (i) prevent the transactions contem-

         plated hereby from qualifying (A) for pooling-of-interests

         accounting treatment or (B) as a reorganization within the

         meaning of Section 368 of the Internal Revenue Code or (ii)

         materially impede or delay receipt of any approval referred

         to in Section 6.01(b) or the consummation of the transactions

         contemplated by this Agreement.


                   2.23.  Brokers and Finders.  Except for Morgan

         Stanley & Co. Incorporated, neither Bancshares nor any Banc-

         shares Subsidiary nor any of their respective officers, di-

         rectors or employees has employed any broker or finder or

         incurred any liability for any financial advisory fees, bro-

         kerage fees, commissions or finder's fees, and no broker or

         finder has acted directly or indirectly for Bancshares or any

         Bancshares Subsidiary, in connection with this Agreement or

         the transactions contemplated hereby.  Schedule 2.23 dis-

         closes a bona fide estimate of the aggregate amount of all


                                     -45-<PAGE>







         fees and expenses expected to be paid by Bancshares to all

         attorneys, accountants or investment bankers in connection

         with the Merger ("Merger Fees").


                   2.24.  Other Activities.  (a)  Except as set forth

         on Schedule 2.24A, neither Bancshares nor any of its Subsid-

         iaries engages in any insurance activities other than acting

         as a principal, agent or broker for insurance that is di-

         rectly related to an extension of credit by Bancshares or any

         of its Subsidiaries and limited to assuring the repayment of

         the balance due on the extension of credit in the event of

         the death, disability or involuntary unemployment of the

         debtor.


                   (b)  Except as set forth on Schedule 2.24B, to the

         knowledge of Bancshares' management:  each Bancshares Subsid-

         iary that is a bank that performs personal trust, corporate

         trust and other fiduciary activities ("Trust Activities") has

         done so with requisite authority under applicable law of Reg-

         ulatory Authorities and in material accordance with the

         agreements and instruments governing such Trust Activities,

         sound fiduciary principles and applicable law and regulation;

         there is no investigation or inquiry by any governmental en-

         tity pending or threatened against Bancshares or any of its

         Subsidiaries thereof relating to the compliance by Bancshares

         or any of its Subsidiaries with sound fiduciary principles



                                     -46-<PAGE>







         and applicable law and regulations; and except when such

         failure would not have a material adverse effect on the Con-

         dition of Bancshares and the Bancshares Subsidiary, taken as

         a whole, each employee of any such bank had the authority to

         act in the capacity in which such employee acted with respect

         to Trust Activities in each case in which such employee was

         held out as a representative of such bank; and such bank has

         established policies and procedures for the purpose of com-

         plying with applicable laws of governmental entities relating

         to Trust Activities, has followed such policies and proce-

         dures in all material respects and has performed appropriate

         internal audit reviews of Trust Activities, which audits have

         disclosed no material violations of applicable laws of gov-

         ernmental entities or such policies and procedures.


                   2.25.  Interest Rate Risk Management Instruments.

         (a)  Set forth on Schedule 2.25A is a list, as of the date

         hereof, of all interest rate swaps, caps, floors, and option

         agreements and other interest rate risk management arrange-

         ments to which Bancshares or any of its Subsidiaries is a

         party or by which any of their properties or assets may be

         bound.


                   (b)  All interest rate swaps, caps, floors and op-

         tion agreements and other interest rate risk management

         arrangements to which Bancshares or any of its Subsidiaries



                                     -47-<PAGE>







         is a party or by which any of their properties or assets may

         be bound were entered into in the ordinary course of business

         and, to the knowledge of Bancshares, in accordance with pru-

         dent banking practice and applicable rules, regulations and

         policies of Regulatory Authorities and with counterparties

         believed to be financially responsible at the time and are

         legal, valid and binding obligations and are in full force

         and effect.  Bancshares and each of its Subsidiaries has duly

         performed in all material respects all of its obligations

         thereunder to the extent that such obligations to perform

         have accrued, and, to the knowledge of Bancshares, as of the

         date hereof, there are no material breaches, violations or

         defaults or allegations or assertions of such by any party

         thereunder.


                   2.26.  Accuracy of Information.  To the knowledge

         of Bancshares, the statements of Bancshares contained in this

         Agreement, the Schedules and any other written document exe-

         cuted and delivered by or on behalf of Bancshares pursuant to

         the terms of this Agreement are true and correct in all mate-

         rial respects, and such statements and documents do not omit

         any material fact necessary to make the statements contained

         therein not misleading.








                                     -48-<PAGE>







                                  ARTICLE III

            REPRESENTATIONS, WARRANTIES AND COVENANTS OF MERCANTILE


                   Mercantile represents, and warrants to and cov-

         enants with Bancshares as follows:


                   3.01.  Organization and Authority.  Mercantile is a

         corporation and each of its Subsidiaries (each, a "Mercantile

         Subsidiary") is a corporation, bank, trust company or other

         entity duly organized, validly existing and in good standing

         under the laws of the jurisdiction of organization, is duly

         qualified to do business and is in good standing in all ju-

         risdictions where its ownership or leasing of property or the

         conduct of its business requires it to be so qualified and

         has corporate power and authority to own its properties and

         assets and to carry on its business as it is now being con-

         ducted, except where the failure to be so qualified would not

         have a material adverse effect on the Condition of Mercantile

         and its Subsidiaries, taken as a whole.  Mercantile is regis-

         tered as a bank holding company with the Board under the

         Holding Company Act.  True and complete copies of the Ar-

         ticles of Incorporation and Bylaws of Mercantile and of

         Merger Sub, each in effect on the date of this Agreement,

         have been provided to Bancshares.


                   3.02.  Capitalization.  The authorized capital

         stock of Mercantile consists of (i) 100,000,000 shares of


                                     -49-<PAGE>







         Mercantile Common Stock, of which, as of September 30, 1996,

         63,255,861 shares were issued and outstanding and (ii)

         5,000,000 shares of preferred stock, no par value ("Mercan-

         tile Preferred Stock"), issuable in series, none of which, as

         of September 30, 1996, is issued and outstanding.  Mercantile

         has designated 1,000,000 shares of Mercantile Preferred Stock

         as "Series A Junior Participating Preferred Stock" and has

         reserved such shares for issuance upon the exercise of Pre-

         ferred Stock Purchase Rights (the "Rights") under a Rights

         Agreement dated May 23, 1988 (the "Mercantile Rights Agree-

         ment"), between Mercantile and Mercantile Bank of St. Louis

         National Association, as Rights Agent.  As of September 30,

         1996, Mercantile had reserved (i) 1,166,068 shares of Mercan-

         tile Common Stock for issuance under various stock option and

         incentive plans ("Mercantile Stock Options"), (ii) 1,177,066

         shares of Mercantile Common Stock for issuance upon the ac-

         quisition of Today's Bancorp, Inc. ("Today's") pursuant to an

         agreement dated March 19, 1996, (iii) 258,783 shares of Mer-

         cantile Common Stock for issuance upon the acquisition of

         First Financial Corp. of America ("First Financial") pursuant

         to an agreement dated July 9, 1996, and (iv) 600,418 shares

         of Mercantile Common Stock for issuance upon the acquisition

         of Regional Bancshares, Inc. ("Regional") pursuant to an

         agreement dated August 22, 1996.  From September 30, 1996

         through the date of this Agreement, no shares of Mercantile



                                     -50-<PAGE>







         Common Stock or other Equity Securities of Mercantile have

         been issued excluding any such shares which may have been

         issued pursuant to stock-based employee benefit or incentive

         plans and programs, or pursuant to the foregoing agreements.

         Mercantile continually evaluates possible acquisitions and

         may prior to the Effective Time enter into one or more agree-

         ments providing for, and may consummate, the acquisition by

         it of another bank, association, bank holding company, sav-

         ings and loan holding company or other company (or the assets

         thereof) for consideration that may include equity securi-

         ties.  In addition, prior to the Effective Time, Mercantile

         may, depending on market conditions and other factors, other-

         wise determine to issue equity, equity-linked or other se-

         curities for financing purposes.  Notwithstanding the fore-

         going, Mercantile will not take any action that would (i)

         prevent the transactions contemplated hereby from qualifying

         (A) for pooling-of-interests accounting treatment or (B) as a

         reorganization within the meaning of Section 368 of the In-

         ternal Revenue Code or (ii) materially impede or delay re-

         ceipt of any approval referred to in Section 6.01(b) or the

         consummation of the transactions contemplated by this Agree-

         ment.  Except as set forth in this Section and except pur-

         suant to the Mercantile Rights Agreement, there are no other

         Equity Securities of Mercantile outstanding.  All of the is-

         sued and outstanding shares of Mercantile Common Stock are



                                     -51-<PAGE>







         validly issued, fully paid, and nonassessable, and have not

         been issued in violation of any preemptive right of any

         stockholder of Mercantile.  The Mercantile Common Stock to be

         issued in the Merger will be, when so issued, duly autho-

         rized, validly issued, fully paid and non-assessable, and

         will not be issued in violation of any preemptive right of

         any stockholder of Mercantile.


                   3.03.  Authorization.  (a)  Each of Mercantile and

         Merger Sub has the corporate power and authority to enter

         into this Agreement and to carry out its obligations here-

         under.  The only stockholder vote required for Mercantile to

         approve the Agreement is the affirmative vote of the holders

         of at least a majority of the votes cast in connection with

         the Agreement by holders of Mercantile Common Stock.  The

         execution, delivery and performance of this Agreement by Mer-

         cantile and Merger Sub and the consummation by Mercantile and

         Merger Sub of the transactions contemplated hereby have been

         duly authorized by all requisite corporate action of Mercan-

         tile and Merger Sub.  This Agreement is a valid and binding

         obligation of Mercantile and Merger Sub enforceable against

         Mercantile and Merger Sub in accordance with its terms.  


                   (b)  Neither the execution, delivery nor perfor-

         mance by Mercantile or Merger Sub of this Agreement, nor the

         consummation by Mercantile or Merger Sub of the transactions



                                     -52-<PAGE>







         contemplated hereby, nor compliance by Mercantile or Merger

         Sub with any of the provisions hereof, will (i) violate, con-

         flict with or result in a breach of any provisions of, or

         constitute a default (or an event which, with notice or lapse

         of time or both, would constitute a default) or result in the

         termination of, or accelerate the performance required by, or

         result in a right of termination or acceleration of, or re-

         sult in the creation of, any Lien upon any of the material

         properties or assets of Mercantile or any Mercantile Subsid-

         iary under any of the terms, conditions or provisions of (x)

         its articles or certificate of incorporation or bylaws, or

         (y) any material note, bond, mortgage, indenture, deed of

         trust, license, lease, agreement or other instrument or obli-

         gation to which Mercantile or any Mercantile Subsidiary is a

         party or by which it may be bound, or to which Mercantile or

         any Mercantile Subsidiary or any of the material properties

         of Mercantile or any Mercantile Subsidiary may be subject,

         other than those as to which any such violation, conflict,

         breach, event, termination, acceleration or creation would

         not have a material adverse effect on the Condition of Mer-

         cantile and the Mercantile Subsidiaries, taken as a whole, or

         (ii) subject to compliance with the statutes and regulations

         referred to in paragraph (c) of this Section 3.03, to the

         best knowledge of Mercantile, violate any judgment, ruling,

         order, writ, injunction, decree, statute, rule or regulation



                                     -53-<PAGE>







         applicable to Mercantile or any of its Subsidiaries or any of

         their respective material properties or assets.


                   (c)  Other than in connection with or in compliance

         with the provisions of Missouri Act, the Securities Act, the

         Exchange Act, the Investment Company Act, the securities or

         blue sky laws of the various states or filings, consents,

         reviews, authorizations, approvals or exemptions required

         under the Holding Company Act, and the HSR Act, or any re-

         quired approvals of the Federal Reserve Board or the State

         Bank Regulators or filings required with respect to any

         Transfer Taxes described in Section 5.18, no notice to, fil-

         ing with, exemption or review by, or authorization, consent

         or approval of, any public body or authority is necessary for

         the consummation by Mercantile of the transactions contem-

         plated by this Agreement.


                   3.04.  Mercantile Financial Statements.  The supp-

         lemental consolidated and parent company only balance sheets

         of Mercantile and its Subsidiaries as of December 31, 1995,

         1994 and 1993 and related supplemental consolidated and

         parent company only statements of income, cash flows and

         changes in shareholders' equity for each of the three years

         in the three-year period ended December 31, 1995, together







                                     -54-<PAGE>







         with the notes thereto, audited by KPMG Peat Marwick ("Mer-

         cantile Auditors") and included in Mercantile's current re-

         port on Form 8-K dated March 11, 1996 as filed with the SEC,

         and the unaudited consolidated balance sheets of Mercantile

         and its Subsidiaries as of March 31 and June 30, 1996 and the

         related unaudited consolidated statements of income and cash

         flows for the periods then ended included in quarterly re-

         ports on Form 10-Q as filed with the SEC (collectively, the

         "Mercantile Financial Statements"), have been prepared in

         accordance with GAAP, present fairly the consolidated finan-

         cial position of Mercantile and its Subsidiaries at the dates

         and the consolidated results of operations, changes in stock-

         holders' equity and cash flows of Mercantile and its Subsid-

         iaries for the periods stated therein and are derived from

         the books and records of Mercantile and its Subsidiaries,

         which are complete and accurate in all material respects and

         have been maintained in all material respects in accordance

         with applicable laws and regulations.  Neither Mercantile nor

         any of its Subsidiaries has any contingent liabilities that

         are material either individually, or in the aggregate, to

         Mercantile and its Subsidiaries, taken as a whole, other than

         those reflected in the Mercantile Financial Statements or

         disclosed in the footnotes thereto, in the Mercantile SEC

         Reports (as hereinafter defined) or arising pursuant to

         agreements in the ordinary course of business.



                                     -55-<PAGE>








                   3.05.  Mercantile Reports.  Since January 1, 1993,

         each of Mercantile and the Mercantile Subsidiaries has filed

         all material reports, registrations and statements, together

         with any required material amendments thereto, that it was

         required to file with any Regulatory Authority.  All such

         reports and statements filed with the SEC are collectively

         referred to herein as "Mercantile SEC Reports" and all such

         reports and statements filed with any such Regulatory Author-

         ity are collectively referred to herein as the "Mercantile

         Reports."  As of its respective date, each Mercantile Report

         complied in all material respects with all the rules and re-

         gulations promulgated by the applicable Regulatory Authority

         and did not contain any untrue statement of a material fact

         or omit to state a material fact required to be stated there-

         in or necessary in order to make the statements therein, in

         light of the circumstances under which they were made, not

         misleading.


                   3.06.  Material Adverse Change.  Since December 31,

         1995, there has been no material adverse change in the Con-

         dition of Mercantile and its Subsidiaries, taken as a whole,

         except (i) as may have resulted or may result from changes to









                                     -56-<PAGE>







         laws and regulations or changes in economic conditions ap-

         plicable to banking institutions generally or in general lev-

         els of interest rates affecting banking institutions gen-

         erally and (ii) the costs incurred or to be incurred by Mer-

         cantile in connection with this Agreement, including costs

         incurred for investment banking, accounting and legal ser-

         vices.


                   3.07.  Compliance with Laws.  (a)  Each of Mercan-

         tile and its Subsidiaries has complied with all laws, regula-

         tions, and orders (including without limitation zoning ordi-

         nances, building codes, ERISA, and securities, tax, environ-

         mental, civil rights, and occupational health and safety laws

         and regulations and including without limitation in the case

         of any Mercantile Subsidiary that is a bank, banking organi-

         zation, thrift, banking corporation or trust company, all

         statutes, rules, regulations and policy statements pertaining

         to the conduct of a banking, deposit-taking or lending or

         related business or to the exercise of trust powers) and gov-

         erning instruments applicable to them and to the conduct of

         their business, except where such failure to comply would not

         have a material adverse effect on the Condition of Mercantile

         and its Subsidiaries, taken as a whole, and (ii) neither Mer-

         cantile nor any Mercantile Subsidiary is in default under,

         and no event has occurred which, with the lapse of time or

         notice or both, could result in the default under, the terms


                                     -57-<PAGE>







         of any judgment, order, writ, decree, permit, or license of

         any Regulatory Authority or court, whether federal, state,

         municipal, or local and whether at law or in equity, except

         where such default would not have a material adverse effect

         on the Condition of Mercantile and its Subsidiaries, taken as

         a whole.  Neither Mercantile nor any Mercantile Subsidiary is

         subject to or reasonably likely to incur a liability as a

         result of its ownership, operation, or use of any Property of

         Mercantile (whether directly or, to the best knowledge of

         Mercantile, as a consequence of such Property being part of

         the investment portfolio of Mercantile or any Mercantile Sub-

         sidiary) (A) that is contaminated by or contains any Toxic

         Substance, or (B) on which any Toxic Substance has been

         stored, disposed of, placed, or used in the construction

         thereof; and which, in each case, reasonably could be ex-

         pected to have a material adverse effect on the Condition of

         Mercantile and its Subsidiaries, taken as a whole.  Except

         for statutory or regulatory restrictions of general applica-

         tion, no Regulatory Authority has placed any restriction on

         the business of Mercantile or any Mercantile Subsidiary which

         reasonably could be expected to have a material adverse ef-

         fect on the Condition of Mercantile and its Subsidiaries,

         taken as a whole.  As of the date of this Agreement, no

         claim, action, suit, or proceeding is pending against Mer-

         cantile or any Mercantile Subsidiary relating to Property of



                                     -58-<PAGE>







         Mercantile before any court or other Regulatory Authority or

         arbitration tribunal relating to hazardous substances, pollu-

         tion, or the environment, and there is no outstanding judg-

         ment, order, writ, injunction, decree, or award against or

         affecting Mercantile or any Mercantile Subsidiary with re-

         spect to the same.


                   (b)  Mercantile and each of its Subsidiaries have

         all permits, licenses, authorizations, orders and approvals

         of, and have made all filings, applications and registrations

         with, all Regulatory Authorities that are required in order

         to permit them to own or lease their properties and assets

         and to carry on their business as presently conducted, except

         where the failure to so have or make would not have a mate-

         rial adverse effect on the Condition of Mercantile and its

         Subsidiaries, taken as a whole; all such permits, licenses,

         certificates of authority, orders and approvals are in full

         force and effect and, to the best knowledge of Mercantile, no

         suspension or cancellation of any of them is threatened; and

         all such filings, applications and registrations are current.


                   (c)  From and after January 1, 1993, neither Mer-

         cantile nor any Mercantile Subsidiary has received any noti-

         fication or communication which has not been resolved from

         any Regulatory Authority (i) asserting that any Mercantile or





                                     -59-<PAGE>







         any Subsidiary of Mercantile, is not in substantial compli-

         ance with any of the statutes, regulations or ordinances that

         such Regulatory Authority enforces, except with respect to

         matters which (A) are set forth on Schedule 3.07C or in any

         writing previously furnished to Bancshares or (B) reasonably

         could not be expected to have a material adverse effect on

         the Condition of Mercantile and its Subsidiaries, taken as a

         whole, (ii) threatening to revoke any license, franchise,

         permit or governmental authorization that is material to the

         Condition of Mercantile and its Subsidiaries, taken as a

         whole, including without limitation such company's status as

         an insured depositary institution under the Federal Deposit

         Insurance Act, or (iii) requiring or threatening to require

         Mercantile or any of its Subsidiaries, or indicating that

         Mercantile or any of its Subsidiaries may be required, to

         enter into a cease and desist order, agreement or memorandum

         of understanding or any other agreement restricting or limit-

         ing or purporting to direct, restrict or limit in any mate-

         rial manner the operations of Mercantile or any of its Sub-

         sidiaries, including without limitation any restriction on

         the payment of dividends.  No such cease and desist order,

         agreement or memorandum of understanding or other agreement

         is currently in effect.  







                                     -60-<PAGE>







                   (d)  Neither Mercantile nor any Mercantile Subsid-

         iary is required by Section 32 of the Federal Deposit Insur-

         ance Act to give prior notice to any federal banking agency

         of the proposed addition of an individual to its board of

         directors or the employment of an individual as a senior ex-

         ecutive officer.


                   3.08.  Registration Statement, etc.  None of the in-

         formation regarding Mercantile or any of its Subsidiaries sup-

         plied or to be supplied by Mercantile for inclusion or included

         in (i) the Registration Statement, (ii) the Proxy Statement, or

         (iii) any other documents to be filed with any Regulatory Au-

         thority in connection with the transactions contemplated hereby

         will, at the respective times such documents are filed with any

         Regulatory Authority and, in the case of the Registration

         Statement, when it becomes effective and, with respect to the

         Proxy Statement, when mailed (or furnished to stockholders of

         Bancshares), be false or misleading with respect to any mate-

         rial fact, or omit to state any material fact necessary in or-

         der to make the statements therein not misleading or, in the

         case of the Proxy Statement or any amendment thereof or supple-

         ment thereto, at the time of the Meeting, be false or mislead-

         ing with respect to any material fact, or omit to state any

         material fact necessary to correct any statement in any earlier

         communication with respect to the solicitation of any proxy for




                                     -61-<PAGE>







         the Meeting.  All documents which Mercantile or any of its Sub-

         sidiaries are responsible for filing with any Regulatory Au-

         thority in connection with the Merger will comply as to form in

         all material respects with the provisions of applicable law.


                   3.09.  Brokers and Finders.  Except for UBS Secu-

         rities Inc., neither Mercantile nor any of its Subsidiaries

         nor any of their respective officers, directors or employees

         has employed any broker or finder or incurred any liability

         for any financial advisory fees, brokerage fees, commissions

         or finder's fees, and no broker or finder has acted directly

         or indirectly for Mercantile or any of its Subsidiaries, in

         connection with this Agreement or the transactions contem-

         plated hereby.


                   3.10.  Commitments and Contracts.  Neither Mercan-

         tile nor any Mercantile Subsidiary is in violation of its

         charter documents or bylaws or in default under any material

         agreement, commitment, arrangement, lease, insurance policy,

         or other instrument, whether entered into in the ordinary

         course of business or otherwise and whether written or oral,

         and there has not occurred any event that, with the lapse of

         time or giving of notice or both, would constitute such a

         default, except, in all cases, where such default would not

         have a material adverse effect on the Condition of Mercantile

         and its Subsidiaries, taken as a whole.



                                     -62-<PAGE>








                   3.11.  Litigation and Other Proceedings.  Neither

         Mercantile nor any Mercantile Subsidiary is a party to any

         pending or, to the best knowledge of Mercantile, threatened

         claim, action, suit, investigation or proceeding, or is sub-

         ject to any order, judgment or decree, except for matters

         which, in the aggregate, will not have, or reasonably could

         not be expected to have, a material adverse effect on the

         Condition of Mercantile and its Subsidiaries, taken as a

         whole.  Without limiting the generality of the foregoing, as

         of the date of this Agreement, there are no actions, suits,

         or proceedings pending or, to the best knowledge of Mercan-

         tile, threatened against Mercantile or any Mercantile Subsid-

         iary or any of their respective officers or directors by any

         stockholder of Mercantile or any Mercantile Subsidiary (or

         any former stockholder of Mercantile or any Mercantile Sub-

         sidiary) or involving claims under the Securities Act, the

         Exchange Act, the Community Reinvestment Act of 1977, as

         amended, or the fair lending laws or which purport or seek to

         enjoin or restrain the transactions contemplated by this

         Agreement.  


                   3.12.  Interest Rate Risk Management Instruments.

         All interest rate swaps, caps, floors and option agreements

         and other interest rate risk management arrangements to which

         Mercantile or any of its Subsidiaries is a party or by which



                                     -63-<PAGE>







         any of their properties or assets may be bound were entered

         into in the ordinary course of business and, to the knowledge

         of Mercantile, in accordance with prudent banking practice

         and applicable rules, regulations and policies of Regulatory

         Authorities and with counterparties believed to be finan-

         cially responsible at the time and are legal, valid and bind-

         ing obligations and are in full force and effect.  Mercantile

         and each of its Subsidiaries has duly performed in all mate-

         rial respects all of its obligations thereunder to the extent

         that such obligations to perform have accrued, and, to the

         knowledge of Mercantile, as of the date hereof, there are no

         material breaches, violations or defaults or allegations or

         assertions of such by any party thereunder.                  


                   3.13.  Taxes.  Mercantile and each Mercantile Subsid-

         iary have timely filed or will timely file (including exten-

         sions) all material tax returns required to be filed at or

         prior to the Closing Date except where failures to so timely

         file would not, individually or in the aggregate, reasonably be

         expected to have a material adverse effect on the Condition of

         Mercantile and the Mercantile Subsidiaries, taken as a whole

         ("Mercantile Returns").  Each of Mercantile and its Subsid-

         iaries has paid, or set up adequate reserves on the Mercantile

         Financial Statements for the payment of, all taxes required to

         be paid in respect of the periods covered by the Mercantile

         Financial Statements and has paid or set up adequate reserves


                                     -64-<PAGE>







         on the most recent financial statements Mercantile has filed

         under the Exchange Act for the payment of, all taxes antici-

         pated to be payable in respect of the periods covered by such

         financial statements, in each case except where failures to so

         pay or set up adequate reserves would not, individually or in

         the aggregate, reasonably be expected to have a material ad-

         verse effect on the Condition of Mercantile and the Mercantile

         Subsidiaries, taken as a whole.  No material deficiencies for

         any tax, assessment or governmental charge have been proposed,

         asserted or assessed in writing by any governmental or taxing

         authority against any of Mercantile or any Mercantile Subsid-

         iary which have not been settled or would not be covered by

         existing reserves.  Neither Mercantile nor any Mercantile Sub-

         sidiary is delinquent in the payment of any material tax, as-

         sessment or governmental charge shown to be due on any Mercan-

         tile Return (taking into account extensions properly obtained),

         and no waiver of the time to assess any tax granted in writing

         by Mercantile or any Mercantile Subsidiary is pending.  The

         federal and state income tax returns of Mercantile and the Mer-

         cantile Subsidiaries have been audited and settled by the IRS

         or appropriate state tax authorities for all periods ended

         through December 31, 1992, or the period for assessment of

         taxes in respect of such periods has expired.  To the best

         knowledge of Mercantile, the representations set forth in the





                                     -65-<PAGE>







         Mercantile Tax Certificate attached as Exhibit E to this Agree-

         ment, if made on the date hereof (assuming the Merger was con-

         summated on the date hereof), would be true and correct.  


                   3.14.  Accounting, Tax and Regulatory Matters.  Nei-

         ther Mercantile nor any Mercantile Subsidiary has taken or

         agreed to take any action or has any knowledge of any fact or

         circumstance that would (i) prevent the transactions contem-

         plated hereby from qualifying (A) for pooling-of-interests ac-

         counting treatment or (B) as a reorganization within the mean-

         ing of Section 368 of the Internal Revenue Code or (ii) materi-

         ally impede or delay receipt of any approval referred to in

         Section 6.01(b) or the consummation of the transactions con-

         templated by this Agreement.


                   3.15.  Accuracy of Information.  To the knowledge of

         Mercantile, the statements of Mercantile contained in this

         Agreement, the Schedules and in any other written document ex-

         ecuted and delivered by or on behalf of Mercantile pursuant to

         the terms of this Agreement are true and correct in all mate-

         rial respects, and such statements and documents do not omit

         any material fact necessary to make the statements contained

         herein or therein not misleading.









                                     -66-<PAGE>







                   3.16.  Labor.  No work stoppage involving Mercantile

         or any Mercantile Subsidiary, is pending or, to the best knowl-

         edge of Mercantile, threatened which reasonably could be ex-

         pected to have a material adverse effect on the Condition of

         Mercantile and its Subsidiaries, taken as a whole.  Neither

         Mercantile nor any Mercantile Subsidiary is involved in, or, to

         the best knowledge of Mercantile, threatened with or affected

         by, any labor dispute, arbitration, law suit or administration

         proceeding which reasonably could be expected to have a mate-

         rial adverse effect on the Condition of Mercantile and its Sub-

         sidiaries, taken as a whole.



                                   ARTICLE IV

               CONDUCT OF BUSINESSES PRIOR TO THE EFFECTIVE TIME


                   4.01.  Conduct of Businesses Prior to the Effective

         Time.  During the period from the date of this Agreement to

         the Effective Time, each of Mercantile and Bancshares shall,

         and shall cause each of their respective Subsidiaries to,

         conduct its business according to the ordinary and usual

         course consistent with past practices and shall, and shall

         cause each such Subsidiary to, use its best efforts to main-

         tain and preserve its business organization, employees and

         advantageous business relationships and retain the services

         of its officers and key employees.




                                     -67-<PAGE>







                   4.02.  Forbearances.  Except to the extent required

         by law, regulation or Regulatory Authority, or as set forth

         on Schedule 4.02 or as otherwise contemplated by this Agree-

         ment, during the period from the date of this Agreement to

         the Effective Time, Bancshares shall not and shall not permit

         any of its Subsidiaries to, without the prior written consent

         of Mercantile:


                   (a)  declare, set aside or pay any dividends or

              other distributions, directly or indirectly, in respect

              of its capital stock (other than dividends from a Sub-

              sidiary of Bancshares to Bancshares or another Subsid-

              iary of Bancshares), except that Bancshares may declare

              and pay cash dividends on the Bancshares Common Stock of

              not more than $.35 per share per quarterly period; pro-

              vided, that Bancshares shall not declare or pay any div-

              idends on Bancshares Common Stock for any period in

              which its stockholders will be entitled to receive any

              regular quarterly dividend on the shares of Mercantile

              Common Stock to be issued in the Merger; or,


                   (b)  enter into or amend any employment, severance

              or similar agreement or arrangement with any director or

              officer or employee, or materially modify any of the

              Bancshares Employee Plans or grant any salary or wage

              increase or materially increase any employee benefit



                                     -68-<PAGE>







              (including incentive or bonus payments), except hiring

              employees in the ordinary course of business and normal

              individual increases in compensation to employees con-

              sistent with past practice, or as required by law or

              contract; or, 


                   (c)  authorize, recommend (subject to the fiduciary

              duties of Bancshares' Board of Directors as advised in

              writing by outside counsel to Bancshares), propose or

              announce an intention to authorize, so recommend or pro-

              pose, or enter into an agreement in principle with re-

              spect to, any merger, consolidation or business combina-

              tion (other than the Merger), any acquisition of a mate-

              rial amount of assets or securities, any disposition of

              a material amount of assets or securities or any release

              or relinquishment of any material contract rights; or


                   (d)  propose or adopt any amendments to its ar-

              ticles of incorporation, association or other charter

              document or bylaws; or


                   (e)  issue, sell, grant, confer or award any of its

              Equity Securities (except that Bancshares may (i) grant

              options for up to 250,000 shares of Bancshares Common

              Stock under its existing stock option plans consistent

              with its normal compensation practices, (ii) issue




                                     -69-<PAGE>







              shares of Bancshares Common Stock upon exercise of Banc-

              shares Stock Options outstanding on the date of this

              Agreement or granted in compliance with this clause (e),

              (iii) issue shares of Bancshares Common Stock upon the

              conversion of the Bancshares Convertible Notes or as

              contemplated by the Bancshares' Savings Challenge Plan,

              and (iv) issue shares of Bancshares Common Stock pursu-

              ant to the First City Acquisition Agreement and except

              that Bancshares Subsidiaries may issue director qualify-

              ing shares subject to repurchase agreements in accor-

              dance with present practice) or effect any stock split

              or adjust, combine, reclassify or otherwise change its

              capitalization as it existed on the date of this Agree-

              ment; or


                   (f)  purchase, redeem, retire, repurchase, or ex-

              change, or otherwise acquire or dispose of, directly or

              indirectly, any of its Equity Securities, whether pur-

              suant to the terms of such Equity Securities or other-

              wise other than director qualifying shares; or


                   (g)  (i)  without first consulting with Mercantile,

              enter into, renew or increase any loan or credit commit-

              ment (including stand-by letters of credit) to, or in-

              vest or agree to invest in any person or entity or modi-

              fy any of the material provisions or renew or otherwise



                                     -70-<PAGE>







              extend the maturity date of any existing loan or credit

              commitment (collectively, "Lend to") in an amount that,

              which under the credit policies and procedures of Banc-

              shares and/or Banks in effect as of the date hereof,

              would be referred to the executive loan committee(s) of

              Bancshares and/or Banks as constituted and existing as

              of the date of this Agreement; (ii) without first ob-

              taining the written consent of Mercantile, lend to any

              person or entity in an amount in excess of $16,000,000

              or in an amount which, when aggregated with any and all

              loans or credit commitments to such person or entity,

              would be in excess of $16,000,000; or (iii) Lend to any

              person other than in accordance with lending policies as

              in effect on the date hereof; provided that in the case

              of clauses (ii) and (iii) Bancshares or any Bancshares

              Subsidiary may make any such loan in the event (A) Banc-

              shares or any Bancshares Subsidiary has delivered to

              Mercantile or its designated representative a notice of

              its intention to make such loan and such information as

              Mercantile or its designated representative may reason-

              ably require in respect thereof and (B) Mercantile or

              its designated representative shall not have reasonably

              objected to such loan by giving written or facsimile







                                     -71-<PAGE>







              notice of such objection within two business days fol-

              lowing the delivery to Mercantile of the notice of in-

              tention and information as aforesaid; provided, however,

              that nothing in this paragraph shall prohibit Bancshares

              or any Bancshares Subsidiary from honoring any contrac-

              tual obligation in existence on the date of this Agree-

              ment.  For purposes of clause (i) of this Section, the

              requirement of Bancshares to consult with Mercantile

              shall be deemed to include the requirement of Bancshares

              and/or the Banks to provide to designated representa-

              tives of Mercantile copies of all information of the

              type and nature provided to such executive loan

              committee(s) in respect of each loan or credit commit-

              ment referred to such committee(s) and the requirement

              that such designated representatives of Mercantile be

              invited to attend the meetings of such executive loan

              committee(s) at which presentations shall be made in

              respect of such referred loans and/or credit commit-

              ments; or


                   (h)  directly or indirectly (including through its

              officers, directors, employees or other representatives)

              initiate, solicit or encourage any discussions, inquir-

              ies or proposals with any third party relating to the

              disposition of any significant portion of the business

              or assets of Bancshares or any Bancshares Subsidiary or


                                     -72-<PAGE>







              the acquisition of Equity Securities of Bancshares or

              any Bancshares Subsidiary or the merger of Bancshares or

              any Bancshares Subsidiary with any person (other than

              Mercantile) or any similar transaction (each such trans-

              action being referred to herein as an "Acquisition

              Transaction"), or provide any such person with informa-

              tion or assistance or negotiate with any such person

              with respect to an Acquisition Transaction, and Banc-

              shares shall promptly notify Mercantile orally of all

              the relevant details relating to all inquiries, indica-

              tions of interest and proposals which it may receive

              with respect to any Acquisition Transaction; or


                   (i)  take any action that would (A) materially impede

              or delay the consummation of the transactions contemplated

              by this Agreement or the ability of Mercantile or Banc-

              shares to obtain any approval of any Regulatory Authority

              required for the transactions contemplated by this Agree-

              ment or to perform its covenants and agreements under this

              Agreement or (B) prevent the transactions contemplated

              hereby from qualifying as a reorganization within the

              meaning of Section 368 of the Internal Revenue Code; or 


                   (j)  other than in the ordinary course of business

              consistent with past practice, incur any indebtedness for

              borrowed money, assume, guarantee, endorse or otherwise as



                                     -73-<PAGE>







              an accommodation become responsible or liable for the ob-

              ligations of any other individual, corporation or other

              entity, or, without prior approval of Mercantile, which

              shall not be unreasonably withheld, pay any Merger Fees in

              excess of the amount set forth on Schedule 2.23; or


                   (k)  materially restructure or materially change its

              investment securities portfolio, through purchases, sales

              or otherwise, or the manner in which the portfolio is

              classified or reported, or execute any individual invest-

              ment transaction for its own account (i) in securities

              backed by the full faith and credit of the United States

              or an agency thereof in excess of $5,000,000 and (ii) in

              any other investment securities in excess of $1,000,000;

              or


                   (l)  agree in writing or otherwise to take any of

              the foregoing actions or engage in any activity, enter

              into any transaction or take or omit to take any other

              act which would make any of the representations and war-

              ranties in Article II of this Agreement untrue or incor-

              rect in any material respect if made anew after engaging

              in such activity, entering into such transaction, or

              taking or omitting such other act.  


                   4.03.  Forbearances of Mercantile.  Except to the

         extent required by law, regulation or Regulatory Authority,


                                     -74-<PAGE>







         or with the prior written consent of Bancshares, during the

         period from the date of this Agreement to the Effective Time,

         Mercantile shall not and shall not permit any of the Mercan-

         tile Subsidiaries to:


                        (a)  declare, set aside or pay any dividends

                   or other distributions, directly or indirectly, in

                   respect of its capital stock (other than dividends

                   from any of the Mercantile Subsidiaries to Mercan-

                   tile or to another of the Mercantile Subsidiaries),

                   except that Mercantile may pay its regular quar-

                   terly dividends in amounts as it shall determine

                   from time to time;


                        (b)  take any action that would (A) materially

                   impede or delay the consummation of the transac-

                   tions contemplated by this Agreement or the ability

                   of Bancshares or Mercantile to obtain any approval

                   of any Regulatory Authority required for the trans-

                   actions contemplated by this Agreement or to per-

                   form its covenants and agreements under this Agree-

                   ment or (B) prevent the transactions contemplated

                   hereby from qualifying as a reorganization within

                   the meaning of Section 368 of the Code; or


                        (c)  agree in writing or otherwise to take any

                   of the foregoing actions or engage in any activity,


                                     -75-<PAGE>







                   enter into any transaction or intentionally take or

                   omit to take any other action which would make any

                   of the representations and warranties in Article

                   III of this Agreement untrue or incorrect in any

                   material respect if made anew after engaging in

                   such activity, entering into such transaction, or

                   taking or omitting such other action.



                                   ARTICLE V

                             ADDITIONAL AGREEMENTS

                   5.01.  Access and Information.  Mercantile and its

         Subsidiaries, on the one hand, and Bancshares and its Subsid-

         iaries, on the other hand, shall each afford to each other,

         and to the other's accountants, counsel and other representa-

         tives, full access during normal business hours, during the

         period prior to the Effective Time, to all their respective

         properties, books, contracts, commitments and records and,

         during such period, each shall furnish promptly to the other

         (i) a copy of each report, schedule and other document filed

         or received by it during such period pursuant to the require-

         ments of federal and state securities laws and (ii) all other

         information concerning its business, properties and personnel

         as such other party may reasonably request.  Each party

         hereto shall, and shall cause its advisors and representa-

         tives to, (A) hold confidential all information obtained in



                                     -76-<PAGE>







         connection with any transaction contemplated hereby with re-

         spect to the other party which is not otherwise public knowl-

         edge, (B) return all documents (including copies thereof)

         obtained hereunder from the other party to such other party

         and (C) use its best efforts to cause all information ob-

         tained pursuant to this Agreement or in connection with the

         negotiation of this Agreement to be treated as confidential

         and not use, or knowingly permit others to use, any such in-

         formation unless such information becomes generally available

         to the public.


                   5.02.  Registration Statement; Regulatory Matters.

         (a)  Mercantile shall prepare and, subject to the review and

         consent of Bancshares with respect to matters relating to Banc-

         shares, file with the SEC as soon as is reasonably practicable,

         but in no event later than 45 days from the date hereof, the

         Registration Statement (or the equivalent in the form of pre-

         liminary proxy material) with respect to the shares of Mer-

         cantile Common Stock to be issued in the Merger and the exer-

         cise of Bancshares Stock Options after the Effective Time.

         Mercantile shall prepare and file an application with the Fed-

         eral Reserve Board as soon as reasonably practicable but in no

         event later than 45 days from the date hereof.  Mercantile

         shall use all reasonable efforts to cause the Registration

         Statement to become effective as soon as reasonably practi-

         cable.  Mercantile shall also take any action required to be


                                     -77-<PAGE>







         taken under any applicable state blue sky or securities laws in

         connection with the issuance of such shares and the exercise of

         such options, and Bancshares and its Subsidiaries shall furnish

         Mercantile all information concerning Bancshares and its Sub-

         sidiaries and the stockholders thereof as Mercantile may rea-

         sonably request in connection with any such action.  Mercantile

         shall use its best efforts to cause the shares of Mercantile

         Common Stock to be issued in the Merger to be approved for

         listing on the New York Stock Exchange, subject to official

         notice of issuance, prior to the Effective Time.


                   (b)  Bancshares and Mercantile shall cooperate and

         use their respective best efforts to prepare all documenta-

         tion, to effect all filings and to obtain all permits, con-

         sents, approvals and authorizations of all third parties and

         Regulatory Authorities necessary to consummate the transac-

         tions contemplated by this Agreement and, as and if directed

         by Mercantile, to consummate such other mergers, consolida-

         tions or asset transfers or other transactions by and among

         Mercantile's Subsidiaries and Bancshares' Subsidiaries con-

         currently with or following the Effective Time, provided,

         however, that the foregoing shall not (A) alter or change the

         Merger Consideration, (B) adversely affect the tax treatment

         to Bancshares' stockholders as a result of receiving the

         Merger Consideration or (C) materially impede or delay re-

         ceipt of any approval referred to in Section 6.01(b) or the


                                     -78-<PAGE>







         consummation of the transactions contemplated by this Agree-

         ment.


                   5.03.  Stockholder Approval.  Each party shall call

         a meeting of its stockholders to be held as soon as practi-

         cable for the purpose of voting upon the Merger or take other

         action for stockholders to authorize the Merger.  In connec-

         tion therewith, Mercantile shall prepare the Joint Proxy

         Statement, subject to the review and consent of Bancshares

         and, with the approval of each of Mercantile and Bancshares,

         the Joint Proxy Statement shall be filed with the SEC and

         mailed to the stockholders of each party.  The board of di-

         rectors of each party shall submit for approval of its stock-

         holders the matters to be voted upon in order to authorize

         the Merger.  The board of directors of each party hereby does

         and (subject to the fiduciary duties of Bancshares' and

         Mercantile's Boards of Directors, as advised by outside coun-

         sel) will recommend approval of the matters to be voted upon

         in order to authorize the Merger and the other transactions

         contemplated hereby to stockholders of such party and will

         use its best efforts to obtain any vote of its stockholders

         that is necessary to authorize the Merger and to consummate

         the transactions contemplated hereby.


                   5.04.  Current Information.  During the period from

         the date of this Agreement to the Effective Time, each party



                                     -79-<PAGE>







         shall promptly furnish the other with copies of all monthly

         and other interim financial information or reports as the

         same become available and shall cause one or more of its des-

         ignated representatives to confer on a regular and frequent

         basis with representatives of the other party.  Each party

         shall promptly notify the other party of any material change

         in its business or operations and of any material governmen-

         tal complaints, investigations or hearings (or communications

         indicating that the same may be contemplated), or the insti-

         tution or the threat of material litigation involving such

         party, and shall keep the other party fully informed of such

         events.


                   5.05.  Agreements of Affiliates; Publication of

         Combined Financial Results.  (a)  As soon as practicable af-

         ter the date of this Agreement, Bancshares shall deliver to

         Mercantile a letter identifying all persons whom Bancshares

         believes to be, at the time this Agreement is submitted to a

         vote of the stockholders of Bancshares, "affiliates" of Banc-

         shares for purposes of Rule 145 under the Securities Act.

         Bancshares shall use its best efforts to cause each person

         who is so identified as an "affiliate" to deliver to Mercan-

         tile as soon as practicable thereafter, a written agreement

         in the form attached hereto as Exhibit C relating to compli-

         ance with the applicable provisions of the Securities Act.




                                     -80-<PAGE>







         Prior to the Effective Time, Bancshares shall amend and supp-

         lement such letter and use its best efforts to cause each ad-

         ditional person who is identified as an "affiliate" to ex-

         ecute a written agreement as set forth in this Section 5.05.


                   (b)  Mercantile shall use its best efforts to pub-

         lish as promptly as reasonably practical, but in no event

         later than 90 days after the end of the first month after the

         Effective Time in which there are at least 30 days of post-

         Merger combined operations, combined sales and net income

         figures as contemplated by and in accordance with the terms

         of SEC Accounting Series Release No. 135.


                   5.06.  Expenses.  Each party hereto shall bear its

         own expenses incident to preparing, entering into and carry-

         ing out this Agreement and to consummating the Merger.


                   5.07.  Miscellaneous Agreements and Consents.  (a)

         Subject to the terms and conditions herein provided, each of

         the parties hereto agrees to use its respective best efforts

         to take, or cause to be taken, all action, and to do, or

         cause to be done, all things necessary, proper or advisable

         under applicable laws and regulations to consummate and make

         effective the transactions contemplated by this Agreement as

         expeditiously as possible, including without limitation using

         its respective best efforts to lift or rescind any injunction

         or restraining order or other order adversely affecting the


                                     -81-<PAGE>







         ability of the parties to consummate the transactions con-

         templated hereby.  Each party shall, and shall cause each of

         its respective subsidiaries to, use its reasonable efforts to

         obtain consents of Regulatory Authorities that are, in the

         opinion of Mercantile, desirable for the consummation of the

         transactions contemplated by this Agreement.


                   (b)  Subject to applicable laws, regulations and

         requirements of Regulatory Authorities, Bancshares, prior to

         the Effective Time, shall (i) consult and cooperate with Mer-

         cantile regarding the implementation of those policies and

         procedures established by Mercantile for its governance and

         that of its Subsidiaries and not otherwise referenced in Sec-

         tion 5.16 hereof, including, without limitation, policies and

         procedures pertaining to the accounting, asset/liability man-

         agement, audit, credit, human resources, treasury and legal

         functions, and (ii) at the request of Mercantile, conform

         Bancshares' existing policies and procedures in respect of

         such matters to Mercantile's policies and procedures or, in

         the absence of any existing Bancshares policy or procedure

         regarding any such function, introduce Mercantile's policies

         or procedures in respect thereof, unless to do so would cause

         Bancshares or any of the Bancshares Subsidiaries to be in

         violation of any law, rule or regulation of any Regulatory

         Authority having jurisdiction over Bancshares and/or the

         Bancshares Subsidiary affected thereby; provided, however,


                                     -82-<PAGE>







         that prior to the date that it shall be a requirement

         hereunder for such policies and procedures to be established,

         Mercantile shall certify to Bancshares that Mercantile's rep-

         resentations and warranties are true and correct as of such

         date, that the approval conditions to its obligations

         contemplated by Section 6.01(b) have been satisfied or waived

         (except to the extent that any waiting period associated

         therewith may then have commenced but not expired) and that

         Mercantile is otherwise in compliance with this Agreement;

         and provided, further, that Bancshares shall not be required

         to take any such action that is not consistent with GAAP and

         regulatory accounting principles.





























                                     -82A-<PAGE>








                   5.08.  Employee Benefits.  (a)  The Bancshares Em-

         ployee Plans shall not be terminated by reason of the Merger

         but shall continue thereafter as plans of the Surviving Cor-

         poration until such time as the employees of Bancshares and

         the Bancshares Subsidiaries are integrated into Mercantile's

         employee benefit plans that are available to other employees

         of Mercantile and Mercantile Subsidiaries, subject to the

         terms and conditions specified in such plans and to such

         changes therein as may be necessary to reflect the consumma-

         tion of the Merger.  Mercantile shall take such steps as are

         necessary or required to integrate the employees of Banc-

         shares and the Bancshares Subsidiaries in Mercantile's em-

         ployee benefit plans available to other employees of Mer-

         cantile and Mercantile Subsidiaries as soon as practicable

         after the Effective Time, (i) with full credit for prior ser-

         vice with Bancshares or any of the Bancshares Subsidiaries

         for all purposes other than determining the amount of benefit

         accruals under any defined benefit plan, (ii) without any

         waiting periods, evidence of insurability, or application of

         any pre-existing condition limitations, and (iii) with full

         credit for claims arising prior to the Effective Time for

         purposes of deductibles, out-of-pocket maximums, benefit max-

         imums, and all other similar limitations for the applicable

         plan year during which the Merger is consummated.  Each of

         Mercantile and Bancshares shall use all reasonable efforts to


                                      -83-<PAGE>







         insure that no amounts paid or payable by Bancshares, Banc-

         shares Subsidiaries or Mercantile to or with respect to any

         employee or former employee of Bancshares or any Bancshares

         Subsidiary will fail to be deductible for federal income tax

         purposes by reason of Section 280G of the Internal Revenue

         Code.  Bancshares shall ensure that following the Effective

         Time no holder of Bancshares Employee Stock Options or any

         participant in any Bancshares Stock Plan shall have any right

         thereunder to acquire any securities of Bancshares or any

         Bancshares Subsidiary.


                   (b)  Mercantile agrees that the following prin-

         ciples shall apply for purposes of determining bonuses for

         1997 under Bancshares' executive performance incentive plan

         as and to the extent adopted by Bancshares' Board of Direc-

         tors, in its sole discretion, prior to the Effective Time:

         (1) all employees of Bancshares and the Bancshares Subsidiar-

         ies at the Effective Time who, at such time, are covered by

         such plan (other than employees whose employment is termi-

         nated (i) by Bancshares for any reason prior to the Effective

         Time, or (ii) voluntarily by the employee or (iii) involun-

         tarily for cause on or prior to the end of the calendar year

         in which the Merger is consummated) shall be eligible to re-

         ceive a pro rata portion of such bonuses; (2) whether any

         bonuses are payable under such plan and, if so, the amount

         thereof shall be determined as if the Merger had not occurred


                                      -84-<PAGE>







         and Bancshares had remained an independent, publicly-owned

         company through the calendar year in which the Merger is con-

         summated, taking into account, to the extent reasonably ap-

         plicable, action that could have been taken but for the limi-

         tations imposed by Section 4.02; provided, that the aggregate

         amount of bonuses paid for 1997 to such employees of Banc-

         shares and its Subsidiaries shall not be in excess of

         $2,850,000; and (3) any bonuses payable pursuant to clause

         (2) above shall be paid as soon as practicable after the end

         of the calendar year in which the Merger is consummated and

         in any event no later than March 31, 1998.  The pro rata por-

         tion of an employee's bonus shall be the amount determined

         pursuant to the preceding sentence multiplied by a fraction,

         the numerator of which shall be the number of days during the

         calendar year for which such employee was employed by Banc-

         shares or a Bancshares Subsidiary or Mercantile or a Mercan-

         tile Subsidiary and the denominator of which shall be 365.

         Prior to the Effective Time, the Compensation Committee of

         Bancshares' Board of Directors may, with Mercantile's ap-

         proval, amend such plan and take other actions thereunder to

         effectuate the foregoing principles.  This paragraph (b)

         shall not apply to any annual bonus payable pursuant to a

         written employment or termination agreement in effect on the

         date hereof.





                                      -85-<PAGE>







                   5.09.  Bancshares Stock Options.  At the Effective

         Time, all rights with respect to Bancshares Common Stock pursu-

         ant to Bancshares Stock Options that are outstanding at the

         Effective Time, whether or not then exercisable, shall be con-

         verted into and become rights with respect to Mercantile Common

         Stock, and Mercantile shall assume each Bancshares Stock Option

         in accordance with the terms of the stock option plan under

         which it was issued and the stock option agreement by which it

         is evidenced.  From and after the Effective Time, (i) each

         Bancshares Stock Option assumed by Mercantile shall be exer-

         cised solely for shares of Mercantile Common Stock, (ii) the

         number of shares of Mercantile Common Stock subject to each

         Bancshares Stock Option shall be equal to the number of shares

         of Bancshares Common Stock subject to such Bancshares Stock

         Option immediately prior to the Effective Time multiplied by

         the Exchange Ratio and (iii) the per share exercise price under

         each Bancshares Stock Option shall be adjusted by dividing the

         per share exercise price under such Bancshares Stock Option by

         the Exchange Ratio and rounding to the nearest cent; provided,

         however, that the terms of each Bancshares Stock Option shall,

         in accordance with its terms, be subject to further adjustment

         as appropriate to reflect any stock split, stock dividend, re-

         capitalization or other similar transaction subsequent to the

         Effective Time.  It is intended that the foregoing assumption

         shall be undertaken in a manner that will not constitute a



                                      -86-<PAGE>







         "modification" as defined in the Internal Revenue Code, as to

         any Bancshares Stock Option that is an "incentive stock op-

         tion."  Mercantile acknowledges that the consummation of the

         Merger will constitute an "acceleration event" as such term is

         defined in the Bancshares Stock Options plans and agreements.


                   5.10.  Press Releases.  Except as may be required

         by law, Bancshares and Mercantile shall consult and agree

         with each other as to the form and substance of any proposed

         press release relating to this Agreement or any of the trans-

         actions contemplated hereby.


                   5.11.  State Takeover Statutes.  Each party will

         take all steps necessary to exempt the transactions contem-

         plated by this Agreement and any agreement contemplated here-

         by from, and if necessary challenge the validity of, any app-

         licable state takeover law.


                   5.12.  D&O Indemnification.  From and after the

         Effective Time, Mercantile agrees to indemnify and hold harm-

         less the past and present employees, agents, directors or

         officers of Bancshares or its Subsidiaries for all acts or

         omissions occurring at or prior to the Effective Time to the

         same extent such persons are indemnified and held harmless

         (1) under their respective Articles of Incorporation or By-

         laws of Bancshares and its Subsidiaries in the form in effect

         at the date of this Agreement, (ii) by operation of law, or


                                      -87-<PAGE>







         (iii) by virtue of any contract, resolution or other agree-

         ment or document existing at the date of this Agreement, and

         such duties and obligations shall continue in full force and

         effect for so long as they would (but for the Merger) other-

         wise survive and continue in full force and effect.  Mercan-

         tile will provide, or cause to be provided, for a period of

         not less than six years from the Effective Time, an insurance

         and indemnification policy that provides the officers and

         directors of Bancshares and its Subsidiaries immediately

         prior to the Effective Time coverage no less favorable than

         as currently provided by Mercantile to its officers and

         directors.


                   5.13.  Best Efforts.  Each of Mercantile and Banc-

         shares undertakes and agrees to use its best efforts to cause

         the Merger (i) to qualify (A) for pooling-of-interests ac-

         counting treatment and (B) as a reorganization within the

         meaning of Section 368 of the Internal Revenue Code and (ii)

         to occur as soon as practicable.  Each of Mercantile and

         Bancshares agrees to not take any action that would materi-

         ally impede or delay the consummation of the transactions

         contemplated by this Agreement or the ability of Mercantile

         or Bancshares to obtain any approval of any Regulatory Au-

         thority required for the transactions contemplated by this

         Agreement or to perform its covenants and agreements under

         this Agreement.


                                      -88-<PAGE>








                   5.14.  Insurance.  Bancshares shall, and Bancshares

         shall cause each of its Subsidiaries to, use its best efforts

         to maintain its existing insurance.


                   5.15.  Bancshares Convertible Notes.  Mercantile

         acknowledges that at the Effective Time, by virtue of the

         Merger and without any further action on the part of Banc-

         shares, the Bancshares Convertible Notes shall be convertible

         into shares of Mercantile Common Stock pursuant to the terms

         of the indenture governing the Bancshares Convertible Notes.

         Mercantile shall, and shall cause the Surviving Corporation

         to, execute with the trustee under such indenture at the Ef-

         fective Time a supplemental indenture providing that such

         Bancshares Convertible Notes shall be convertible into shares

         of Mercantile Common Stock as contemplated by such indenture.


                   5.16.  Conforming Entries.  (a)  Notwithstanding

         that Bancshares believes that Bancshares and the Bancshares

         Subsidiaries have established all reserves and taken all pro-

         visions for possible loan losses required by GAAP and ap-

         plicable laws, rules and regulations, Bancshares recognizes

         that Mercantile may have adopted different loan, accrual and

         reserve policies (including loan classifications and levels

         of reserves for possible loan losses).  Subject to applicable






                                      -89-<PAGE>







         laws, regulations and the requirements of Regulatory Authori-

         ties, from and after the date of this Agreement to the Effec-

         tive Time, Bancshares and Mercantile shall consult with each

         other with respect to conforming the loan, accrual and re-

         serve policies of Bancshares and the Bancshares Subsidiaries

         to those policies of Mercantile.


                   (b)  Subject to applicable laws, regulations and

         the requirements of Regulatory Authorities, in addition, from

         and after the date of this Agreement to the Effective Time,

         Bancshares and Mercantile shall consult with each other with

         respect to determining appropriate Bancshares accruals, re-

         serves and charges to establish and take in respect of excess

         equipment write-off or write-down of various assets and other

         appropriate charges and accounting adjustments taking into

         account the parties' business plans following the Merger.


                   (c)  Subject to applicable laws, regulations and

         the requirements of Regulatory Authorities, Bancshares and

         Mercantile shall consult with each other with respect to de-

         termining the amount and the timing for recognizing for fi-

         nancial accounting purposes Bancshares' expenses of the

         Merger and any restructuring charges relating to or to be

         incurred in connection with the Merger.


                   (d)  Subject to applicable laws, regulations and

         the requirements of Regulatory Authorities, Bancshares shall


                                      -90-<PAGE>







         (i) establish and take such reserves and accruals at such

         time as Mercantile shall reasonably request to conform Banc-

         shares' loan, accrual and reserve policies to Mercantile's

         policies, and (ii) establish and take such accruals, reserves

         and charges in order to implement such policies in respect of

         excess facilities and equipment capacity, severance costs,

         litigation matters, write-off or write-down of various assets

         and other appropriate accounting adjustments, and to recog-

         nize for financial accounting purposes such expenses of the

         Merger and restructuring charges related to or to be incurred

         in connection with the Merger, in each case at such times as

         are reasonably requested by Mercantile; provided, however,

         that on the date such reserves, accruals and charges are to

         be taken, Mercantile shall certify to Bancshares that

         Mercantile's representations and warranties are true and cor-

         rect as of such date, that the approval conditions to its

         obligations contemplated by Section 6.01(b) have been satis-

         fied or waived (except to the extent that any waiting period

         associated therewith may then have commenced but not expired)

         and that Mercantile is otherwise in compliance with this

         Agreement; and provided, further, that Bancshares shall not

         be required to take any such action that is not consistent

         with GAAP and regulatory accounting principles.


                   (e)  No reserves, accruals or charges taken in ac-

         cordance with Section 5.16(d) above may be a basis to assert


                                      -91-<PAGE>







         a violation of a breach of a representation, warranty or cov-

         enant of Bancshares herein.


                   5.17.  Environmental Reports.  Bancshares shall

         cooperate with Mercantile so that Mercantile may as soon as

         reasonably practicable obtain, at Mercantile's expense, a re-

         port of a phase one environmental investigation on all real

         property owned, leased or operated by Bancshares or any of

         the Bancshares Subsidiaries as of the date hereof (but ex-

         cluding "other real estate owned," property held in trust or

         in a fiduciary capacity and space in retail or similar estab-

         lishments leased by Bancshares or any of the Bancshares Sub-

         sidiaries for automatic teller machines or bank branch fa-

         cilities where the space leased comprises less than 20% of

         the total space leased to all tenants of such property) and

         within ten (10) days after the acquisition or lease of any

         real property acquired or leased by Bancshares or any of the

         Bancshares Subsidiaries after the date hereof (but excluding

         space in retail and similar establishments leased by Banc-

         shares or any of the Bancshares Subsidiaries for automatic

         teller machines or bank branch facilities where the space

         leased comprises less than 20% of the total space leased to

         all tenants of such property).  If advisable in light of the

         phase one report with respect to any parcel of real property

         referred to above, in the reasonable opinion of Mercantile,




                                      -92-<PAGE>







         Bancshares shall also cooperate with Mercantile so that Mer-

         cantile may obtain, at Mercantile's expense, a phase two in-

         vestigation report on such designated parcels.  


                   5.18.  Real Estate Transfer Taxes.  Mercantile and

         Bancshares agree that either Bancshares or Merger Sub will

         pay any state or local tax which is attributable to the

         transfer of the beneficial ownership of Bancshares' or any

         Bancshares Subsidiary's real property, if any (collectively,

         the "Transfer Taxes"), and any penalties or interest with

         respect to the Transfer Taxes, payable in connection with the

         consummation of the Merger.  Bancshares and Mercantile agree

         to cooperate with the other in the filing of any returns with

         respect to the Transfer Taxes, including supplying in a

         timely manner a complete list of all real property interests

         held by Bancshares and its Subsidiaries and any information

         with respect to such property that is reasonably necessary to

         complete such returns.  The portion of the consideration al-

         locable to the real property of Bancshares and its Subsidiar-

         ies shall be agreed to between Mercantile and Bancshares.

         The stockholders of Banchshares (who are intended third party

         beneficiaries of this Section 5.18) shall be deemed to have

         agreed to be bound by the allocation established pursuant to

         this Section 5.18 in the preparation of any return with re-

         spect to the Transfer Taxes.




                                      -93-<PAGE>









                                   ARTICLE VI

                                   CONDITIONS


                   6.01.  Conditions to Each Party's Obligation To

         Effect the Merger.  The respective obligations of each party

         to effect the Merger shall be subject to the fulfillment or

         waiver at or prior to the Effective Time of the following

         conditions:


                   (a)  This Agreement shall have received the requi-

              site approval of stockholders of each party.


                   (b)  All requisite approvals of this Agreement and

              the transactions contemplated hereby shall have been

              received from the Federal Reserve Board, the State Bank

              Regulators and any other Regulatory Authority (without

              the imposition of any conditions that are in Mercan-

              tile's reasonable judgment unduly burdensome) and the

              expiration of all requisite waiting periods thereunder.

              For purposes of this paragraph, a divestiture required

              as a condition to any regulatory approval shall not be

              unduly burdensome if such divestiture is consistent with

              Federal Reserve Board guidelines, policies and practices

              regarding the merger of bank holding companies that have

              been utilized in transactions that have recently been

              reviewed prior to the date of this Agreement.


                                      -94-<PAGE>








                   (c)  The Registration Statement shall have been

              declared effective and shall not be subject to a stop

              order or any threatened stop order.


                   (d)  Neither Bancshares nor Mercantile shall be

              subject to any order, decree or injunction of a court or

              agency of competent jurisdiction which enjoins or pro-

              hibits the consummation of the Merger.


                   (e)  Mercantile and Bancshares shall have received

              an opinion of Mercantile Auditors addressed to Mercan-

              tile in form and substance reasonably satisfactory to

              Mercantile and Bancshares, that the Merger will qualify

              for pooling-of-interests accounting treatment, which

              opinion shall not have been withdrawn.  


                   6.02.  Conditions to Obligations of Bancshares To

         Effect the Merger.  The obligations of Bancshares to effect the

         Merger shall be subject to the fulfillment or waiver at or

         prior to the Effective Time of the following additional condi-

         tions:


                   (a)  Representations and Warranties.  The repre-

              sentations and warranties of Mercantile set forth in

              Article III of this Agreement shall be true and correct

              in all material respects as of the date of this Agree-

              ment and as of the Effective Time (as though made on and


                                      -95-<PAGE>







              as of the Effective Time except (i) to the extent such

              representations and warranties are by their express pro-

              visions made as of a specified date or period and (ii)

              for the effect of transactions and actions contemplated

              or required by this Agreement) and Bancshares shall have

              received a certificate of the chairman or chief

              financial officer of Mercantile to that effect.


                   (b)  Performance of Obligations.  Mercantile shall

              have performed in all material respects all obligations

              required to be performed by it under this Agreement

              prior to the Effective Time, and Bancshares shall have

              received a certificate of the chairman or chief finan-

              cial officer of Mercantile to that effect.  


                   (c)  Tax Opinion.  Bancshares shall have received

              an opinion of Sidley & Austin or other counsel reason-

              ably acceptable to Bancshares, in form and substance

              reasonably satisfactory to Bancshares, dated the Effec-

              tive Time, substantially to the effect that for federal

              income tax purposes:


                        (i)  the Merger will constitute a "reorganiza-

                   tion" within the meaning of Section 368(a) of the

                   Internal Revenue Code, and Bancshares, Merger Sub and

                   Mercantile will each be a party to the reorganization




                                      -96-<PAGE>







                   within the meaning of Section 368(b) of the Internal

                   Revenue Code;


                       (ii)  no gain or loss will be recognized by Banc-

                   shares or Merger Sub as a result of the Merger;


                      (iii)  no gain or loss will be recognized by the

                   stockholders of Bancshares upon the conversion of

                   their Bancshares Common Stock into Mercantile Common

                   Stock pursuant to the Merger, except with respect to

                   cash, if any, received in lieu of fractional shares

                   of Mercantile Common Stock;


                       (iv)  the aggregate tax basis of the shares of

                   Mercantile Common Stock received in exchange for

                   shares of Bancshares Common Stock pursuant to the

                   Merger (including a fractional share of Mercantile

                   Common Stock for which cash is paid) will be the same

                   as the aggregate tax basis of such shares of Banc-

                   shares Common Stock;


                        (v)  the holding period for shares of Mercantile

                   Common Stock issued in exchange for shares of Banc-

                   shares Common Stock pursuant to the Merger will in-

                   clude the holder's holding period for such shares of

                   Bancshares Common Stock, provided such shares of





                                      -97-<PAGE>







                   Bancshares Common Stock were held as capital assets

                   by the holder at the Effective Time; and


                       (vi)  a stockholder of Bancshares who receives

                   cash in lieu of a fractional share of Mercantile Com-

                   mon Stock will recognize gain or loss equal to the

                   difference, if any, between such stockholder's basis

                   in the fractional share (determined under clause (iv)

                   above) and the amount of cash received.


         In rendering such opinion, such counsel may rely as to matters

         of fact upon the representations contained herein and shall

         receive, and may rely on, customary representations from Mer-

         cantile, Bancshares, and others, including representations to

         the effect of those contained in the Tax Certificates set forth

         in Exhibits D and E.


                   6.03.  Conditions to Obligations of Mercantile To

         Effect the Merger.  The obligations of Mercantile to effect

         the Merger shall be subject to the fulfillment or waiver at

         or prior to the Effective Time of the following additional

         conditions:


                   (a)  Representations and Warranties.  The repre-

              sentations and warranties of Bancshares set forth in

              Article II of this Agreement shall be true and correct





                                      -98-<PAGE>







              in all material respects as of the date of this Agree-

              ment and as of the Effective Time (as though made on and

              as of the Effective Time except (i) to the extent such

              representations and warranties are by their express pro-

              visions made as of a specific date or period and (ii)

              for the effect of transactions and actions contemplated

              or required by this Agreement) and Mercantile shall have

              received a certificate of the chairman of Bancshares and

              a certificate of the president and chief executive

              officer of Bancshares to that effect.


                   (b)  Performance of Obligations.  Bancshares shall

              have performed in all material respects all obligations

              required to be performed by it under this Agreement

              prior to the Effective Time, and Mercantile shall have

              received a certificate of the chairman of Bancshares and

              a certificate of the president and chief executive of-

              ficer of Bancshares to that effect.


                   (c)  Tax Opinion.  Mercantile shall have received

              an opinion of Wachtell, Lipton, Rosen & Katz, or other

              counsel reasonably acceptable to Mercantile, in form and

              substance reasonably satisfactory to Mercantile, dated

              the Effective Time, substantially to the effect that for

              federal income tax purposes:





                                      -99-<PAGE>








                        (i)  the Merger will constitute a "reorganiza-

                   tion" within the meaning of Section 368(a) of the

                   Internal Revenue Code, and Bancshares, Merger Sub and

                   Mercantile will each be a party to the reorganization

                   within the meaning of Section 368(b) of the Internal

                   Revenue Code;


                       (ii)  no gain or loss will be recognized by Banc-

                   shares or Merger Sub as a result of the Merger;


                      (iii)  no gain or loss will be recognized by the

                   stockholders of Bancshares upon the conversion of

                   their Bancshares Common Stock into Mercantile Common

                   Stock pursuant to the Merger, except with respect to

                   cash, if any, received in lieu of fractional shares

                   of Mercantile Common Stock;


                       (iv)  the aggregate tax basis of the shares of

                   Mercantile Common Stock received in exchange for

                   shares of Bancshares Common Stock pursuant to the

                   Merger (including a fractional share of Mercantile

                   Common Stock for which cash is paid) will be the same

                   as the aggregate tax basis of such shares of Banc-

                   shares Common Stock;







                                     -100-<PAGE>







                        (v)  the holding period for shares of Mercantile

                   Common Stock issued in exchange for shares of Banc-

                   shares Common Stock pursuant to the Merger will in-

                   clude the holder's holding period for such shares of

                   Bancshares Common Stock, provided such shares of

                   Bancshares Common Stock were held as capital assets

                   by the holder at the Effective Time; and


                       (vi)  a stockholder of Bancshares who receives

                   cash in lieu of a fractional share of Mercantile Com-

                   mon Stock will recognize gain or loss equal to the

                   difference, if any, between such stockholder's basis

                   in the fractional share (determined under clause (iv)

                   above) and the amount of cash received.


         In rendering such opinion, such counsel may rely as to matters

         of fact upon the representations contained herein and shall

         receive, and may rely on, customary representations from Mer-

         cantile, Bancshares, and others, including representations to

         the effect of those contained in the Tax Certificates set forth

         in Exhibits D and E.













                                     -101-<PAGE>







                                  ARTICLE VII

                       TERMINATION, AMENDMENT AND WAIVER


                   7.01.  Termination.  This Agreement may be termi-

         nated at any time prior to the Effective Time, whether before

         or after any requisite stockholder approval:


                   (a)  by mutual consent by the Executive Committee

              of the Board of Directors of Mercantile and the Board of

              Directors of Bancshares;


                   (b)  by the Executive Committee of the Board of

              Directors of Mercantile or the Board of Directors of

              Bancshares at any time after the date that is twelve

              months after the date of this Agreement if the Merger

              shall not theretofore have been consummated (provided

              that the terminating party is not then in material

              breach of any representation, warranty, covenant or

              other agreement contained herein); 


                   (c)  by the Executive Committee of the Board of

              Directors of Mercantile or the Board of Directors of

              Bancshares if (i) the Federal Reserve Board has denied

              approval of the Merger and such denial has become final

              and nonappealable or (ii) stockholders of Bancshares or

              Mercantile shall not have approved this Agreement at

              their respective Meetings;



                                     -102-<PAGE>








                   (d)  by the Executive Committee of the Board of

              Directors of Mercantile in the event of a material

              breach by Bancshares of any representation, warranty,

              covenant or other agreement contained in this Agreement,

              which breach is not cured within 30 days after written

              notice thereof to Bancshares by Mercantile; or


                   (e)  by the Board of Directors of Bancshares in the

              event of a material breach by Mercantile of any represen-

              tation, warranty, covenant or other agreement contained in

              this Agreement, which breach is not cured within 30 days

              after written notice thereof is given to Mercantile by

              Bancshares.


                   7.02.  Effect of Termination.  In the event of ter-

         mination of this Agreement by either Mercantile or Bancshares

         as provided in Section 7.01, this Agreement shall forthwith

         become void and there shall be no liability or obligation on

         the part of Mercantile or Bancshares, their respective Sub-

         sidiaries or their respective officers or directors except that

         (i) the second sentence of Section 5.01, Section 5.06, Section

         7.02 and Section 8.01 shall survive any termination of this

         Agreement and (ii) notwithstanding anything to the contrary

         contained in this Agreement, neither Mercantile nor Bancshares

         shall be relieved or released from any liabilities or damages




                                     -103-<PAGE>







         arising out of its willful breach of any provision of this

         Agreement.


                   7.03.  Amendment.  This Agreement and the Schedules

         hereto may be amended by the parties hereto, by action taken

         by or on behalf of their respective Boards of Directors, at

         any time before or after approval of this Agreement by the

         stockholders of Bancshares; provided, however, that after any

         such approval by the stockholders of Bancshares no such modi-

         fication shall alter or change the amount or kind of consid-

         eration to be received by holders of Bancshares Common Stock

         as provided in this Agreement.  This Agreement may not be

         amended except by an instrument in writing signed on behalf

         of each of Mercantile and Bancshares.


                   7.04.  Severability.  Any term, provision, covenant

         or restriction contained in this Agreement held by a court or

         a Regulatory Authority of competent jurisdiction to be in-

         valid, void or unenforceable, shall be ineffective to the

         extent of such invalidity, voidness or unenforceability, but

         neither the remaining terms, provisions, covenants or re-

         strictions contained in this Agreement nor the validity or

         enforceability thereof in any other jurisdiction shall be

         affected or impaired thereby.  Any term, provision, covenant

         or restriction contained in this Agreement that is so found





                                     -104-<PAGE>







         to be so broad as to be unenforceable shall be interpreted to

         be as broad as is enforceable.


                   7.05.  Waiver.  Any term, condition or provision of

         this Agreement may be waived in writing at any time by the

         party which is, or whose stockholders are, entitled to the

         benefits thereof.



                                  ARTICLE VIII

                               GENERAL PROVISIONS


                   8.01.  Non-Survival of Representations, Warranties

         and Agreements.  No investigation by the parties hereto made

         heretofore or hereafter shall affect the representations and

         warranties of the parties which are contained herein and each

         such representation and warranty shall survive such investi-

         gation.  All representations, warranties and agreements in

         this Agreement of Mercantile and Bancshares or in any instru-

         ment delivered by Mercantile or Bancshares pursuant to or in

         connection with this Agreement shall expire at the Effective

         Time or upon termination of this Agreement in accordance with

         its terms or, in the case of any other such instrument, in

         accordance with the terms of such instrument, except for

         those agreements contained herein and therein which by their

         terms apply in whole or in part after the Effective Time.  





                                     -105-<PAGE>







                   8.02.  Notices.  All notices and other communica-

         tions hereunder shall be in writing and shall be deemed to be

         duly received (i) on the date given if delivered personally,

         (ii) upon confirmation of receipt if by facsimile transmis-

         sion, (iii) on the date received if mailed by registered or

         certified mail (return receipt requested), or (iv) on the

         business date after being delivered to a reputable overnight

         delivery service if by such service, to the parties at the

         following addresses (or at such other address for a party as

         shall be specified by like notice):


                       (i)  if to Mercantile or Merger Sub:

                            Mercantile Bancorporation Inc.
                            Mercantile Tower
                            P.O. Box 524
                            St. Louis, Missouri  63166-0524
                            Attention:  John W. Rowe
                                        Executive Vice President,
                                        Mercantile Bank of St. Louis,
                                        National Association

                Copies to:

                            Jon W. Bilstrom, Esq.
                            General Counsel
                            Mercantile Bancorporation Inc.
                            Mercantile Tower
                            P.O. Box 524
                            St. Louis, Missouri  63166-0524

                       and

                            Wachtell, Lipton, Rosen & Katz
                            51 West 52nd Street 
                            New York, New York  10019
                            Attention:  Edward D. Herlihy, Esq.
                            Telecopy:  (212) 403-2000




                                     -106-<PAGE>







                      (ii)  if to Bancshares:

                            John Dubinsky
                            President and Chief Executive Officer
                            Mark Twain Bancshares, Inc.
                            8820 Ladue Road
                            St. Louis, Missouri  63124

                       Copies to:

                            Sidley & Austin
                            One First National Plaza
                            Chicago, Illinois  60603
                            Attention:  Thomas A. Cole, Esq.
                            Telecopy:  (312) 853-7036

                   8.03.  Miscellaneous.  This Agreement (including

         the Schedules and other written documents referred to herein

         or provided hereunder) (i) constitutes the entire agreement

         and supersedes all other prior agreements and understandings,

         both written and oral, among the parties, or any of them,

         with respect to the subject matter hereof, including any con-

         fidentiality agreement between the parties hereto, (ii) ex-

         cept for the provisions of Section 5.12, is not intended to

         confer upon any person not a party hereto any rights or rem-

         edies hereunder, (iii) shall not be assigned by operation of

         law or otherwise and (iv) shall be governed in all respects

         by the laws of the State of Missouri.  Nothing in this Agree-

         ment shall be construed to require any party (or any subsid-

         iary or affiliate of any party) to take any action or fail to

         take any action in violation of applicable law, rule or regu-

         lation.  This Agreement may be executed in counterparts which

         together shall constitute a single agreement.



                                     -107-<PAGE>







                   IN WITNESS WHEREOF, Mercantile and Bancshares have

         caused this Agreement to be signed and, by such signature,

         acknowledged by their respective officers thereunto duly au-

         thorized, and such signatures to be attested to by their re-

         spective officers thereunto duly authorized, all as of the

         date first written above.

         Attest:                         MERCANTILE BANCORPORATION INC.



         /s/ Jon W. Bilstrom             By: /s/ Thomas H. Jacobsen         
         Name:   Jon W. Bilstrom            Name:   Thomas H. Jacobsen
         Title:  General Counsel            Title:  Chairman, President &
                                                    Chief Executive Officer



         Attest:                         AMERIBANC, INC.



         /s/ David Grant                 By: /s/ John W. Rowe               
         Name:   David Grant                Name:   John W. Rowe
         Title:  Senior Vice President      Title:  Vice President



         Attest:                         MARK TWAIN BANCSHARES, INC.



         /s/ Carl A. Wattenberg, Jr.     By: /s/ John P. Dubinsky          
         Name:   Carl A. Wattenberg, Jr.    Name:   John P. Dubinsky
         Title:  Senior Vice President,     Title:  Presdient and Chief
                 Secretary and General              Executive Officer
                 Counsel










                                     -108-









                                                          EXHIBIT 2.2


                             STOCK OPTION AGREEMENT


                   STOCK OPTION AGREEMENT ("Option Agreement") dated

         October 27, 1996, between MERCANTILE BANCORPORATION INC.

         ("Mercantile"), a Missouri corporation registered as a bank

         holding company under the Bank Holding Company Act of 1956,

         as amended (the "Holding Company Act"), and Mark Twain Banc-

         shares, Inc. ("Bancshares"), a Missouri corporation regis-

         tered as a bank holding company under the Holding Company

         Act.


                              W I T N E S S E T H:


                   WHEREAS, the Executive Committee of the Board of

         Directors of Mercantile and the Board of Directors of Banc-

         shares have approved an Agreement and Plan of Reorganization

         dated as of even date herewith (the "Merger Agreement") pro-

         viding for the merger of Bancshares with and into a wholly

         owned subsidiary of Mercantile;


                   WHEREAS, as a condition to Mercantile's entering

         into the Merger Agreement, Mercantile has required that Banc-

         shares agree, and Bancshares has agreed, to grant to Mercan-

         tile the option set forth herein to purchase authorized but

         unissued shares of Bancshares Common Stock;


                   NOW, THEREFORE, in consideration of the premises

         herein contained, the parties agree as follows:<PAGE>








                   1.  Definitions.


                   Capitalized terms used but not defined herein shall

         have the same meanings as in the Merger Agreement.  


                   2.  Grant of Option.


                   Subject to the terms and conditions set forth here-

         in, Bancshares hereby grants to Mercantile an option (the

         "Option") to purchase up to 3,261,522 authorized and unissued

         shares of Bancshares Common Stock at a price of $42.375 per

         share (the "Purchase Price") payable in cash as provided in

         Section 4 hereof.


                   3.  Exercise of Option.


                   (a)  Mercantile may exercise the Option, in whole

         or in part, at any time or from time to time if a Purchase

         Event (as defined below) shall have occurred; provided, how-

         ever, that (i) to the extent the Option shall not have been

         exercised, it shall terminate and be of no further force and

         effect upon the earliest to occur of the Effective Time of

         the Merger, 12 months following termination of the Merger

         Agreement in accordance with Section 7.01(d) thereof, and the

         termination of the Merger Agreement in accordance with Sec-

         tion 7.01(a) through 7.01(c) or 7.01(e) thereof, provided





                                      -2-<PAGE>







         that if such termination follows an Extension Event (as de-

         fined below), the Option shall not terminate until the date

         that is 12 months following such termination; (ii) if the Op-

         tion cannot be exercised on such date because of any injunc-

         tion, order or similar restraint issued by a court of compe-

         tent jurisdiction, the Option shall expire on the 30th busi-

         ness day after such injunction, order or restraint shall have

         been dissolved or when such injunction, order or restraint

         shall have become permanent and no longer subject to appeal,

         as the case may be; and (iii) any such exercise shall be sub-

         ject to compliance with applicable law, including the Holding

         Company Act.


                   (b)  As used herein, a "Purchase Event" shall mean

         any of the following events:


                   (i)  Bancshares or any Bancshares Subsidiary, with-

              out having received prior written consent from Mercan-

              tile, shall have entered into, authorized, recommended,

              proposed or publicly announced its intention to enter

              into, authorize, recommend, or propose, an agreement,

              arrangement or understanding with any person (other than

              Mercantile or any Mercantile Subsidiary) to (A) effect a

              merger or consolidation or similar transaction involving

              Bancshares or any Bancshares Subsidiary, (B) purchase,

              lease or otherwise acquire all or a substantial portion



                                      -3-<PAGE>







              of Bancshares or any Bancshares Subsidiary that consti-

              tutes a Significant Subsidiary (as defined in Rule 1-02

              of Regulation S-X promulgated by the SEC) or (C) pur-

              chase or otherwise acquire (including by way of merger,

              consolidation, share exchange or similar transaction)

              Beneficial Ownership of securities representing 10% or

              more of the voting power of Bancshares or any Bancshares

              Subsidiary (in each case other than any such merger,

              consolidation, purchase, lease or other transaction in-

              volving only Bancshares and one or more Bancshares Sub-

              sidiaries or involving only any two or more Bancshares

              Subsidiaries);


                  (ii)  any person (other than Mercantile or any Sub-

              sidiary of Mercantile, or Bancshares or any Subsidiary

              of Bancshares in a fiduciary capacity) shall have ac-

              quired after the date hereof Beneficial Ownership or the

              right to acquire Beneficial Ownership of 10% or more of

              the voting power of Bancshares; or


                 (iii)  Bancshares' Board of Directors shall have

              withdrawn or modified in a manner adverse to Mercantile

              the recommendation of Bancshares' Board of Directors

              with respect to the Merger Agreement, in each case after

              an Extension Event; or





                                      -4-<PAGE>







                  (iv)  the holders of Bancshares Common Stock shall

              not have approved the Merger Agreement at the Meeting of

              Bancshares stockholders, or such Meeting shall not have

              been held or shall have been cancelled prior to termi-

              nation of the Merger Agreement in accordance with its

              terms, in each case after an Extension Event.


                   (c)  As used herein, the term "Extension Event"

         shall mean any of the following events: 


                   (i)  a Purchase Event of the type specified in

         clauses (b)(i) and (b)(ii) above;


                  (ii)  any person (other than Mercantile or any Mer-

              cantile Subsidiary) shall have "commenced" (as such term

              is defined in Rule 14d-2 under the Exchange Act), or

              shall have filed a registration statement under the Se-

              curities Act with respect to, a tender offer or exchange

              offer to purchase shares of Bancshares Common Stock such

              that, upon consummation of such offer, such person would

              have Beneficial Ownership (as defined below) or the

              right to acquire Beneficial Ownership of 10% or more of

              the voting power of Bancshares; or,


                 (iii)  any person (other than Mercantile or any Sub-

              sidiary of Mercantile, or Bancshares or any Subsidiary





                                      -5-<PAGE>







              of Bancshares in a fiduciary capacity) shall have pub-

              licly announced its willingness, or shall have publicly

              announced a proposal, or publicly disclosed an intention

              to make a proposal, (x) to make an offer described in

              clause (ii) above or (y) to engage in a transaction de-

              scribed in clause (i) above. 


                   (d)  As used herein, the terms "Beneficial Owner-

         ship" and "Beneficially Own" shall have the meanings ascribed

         to them in Rule 13d-3 under the Exchange Act.


                   (e)  In the event Mercantile wishes to exercise the

         Option, it shall deliver to Bancshares a written notice (the

         date of which being herein referred to as the "Notice Date")

         specifying (i) the total number of shares it intends to pur-

         chase pursuant to such exercise and (ii) a place and date not

         earlier than three business days nor later than 60 calendar

         days from the Notice Date for the closing of such purchase

         (the "Closing Date").


                   4.  Payment and Delivery of Certificates.


                   (a)  At the closing referred to in Section 3 here-

         of, Mercantile shall pay to Bancshares the aggregate purchase

         price for the shares of Bancshares Common Stock purchased







                                      -6-<PAGE>







         pursuant to the exercise of the Option in immediately avail-

         able funds by wire transfer to a bank account designated by

         Bancshares.


                   (b)  At such closing, simultaneously with the de-

         livery of cash as provided in Section 4(a), Bancshares shall

         deliver to Mercantile a certificate or certificates repre-

         senting the number of shares of Bancshares Common Stock pur-

         chased by Mercantile, registered in the name of Mercantile or

         a nominee designated in writing by Mercantile, and Mercantile

         shall deliver to Bancshares a letter agreeing that Mercantile

         shall not offer to sell, pledge or otherwise dispose of such

         shares in violation of applicable law or the provisions of

         this Option Agreement.


                   (c)  If at the time of issuance of any Bancshares

         Common Stock pursuant to any exercise of the Option, Banc-

         shares shall have issued any share purchase rights or similar

         securities to holders of Bancshares Common Stock, then each

         such share of Bancshares Common Stock shall also represent

         rights with terms substantially the same as and at least as

         favorable to Mercantile as those issued to other holders of

         Bancshares Common Stock.


                   (d)  Certificates for Bancshares Common Stock de-

         livered at any closing hereunder shall be endorsed with a re-

         strictive legend which shall read substantially as follows:


                                      -7-<PAGE>








                   The transfer of the shares represented by this cer-
                   tificate is subject to certain provisions of an
                   agreement between the registered holder hereof and
                   Mark Twain Bancshares, Inc. ("Mark Twain"), a copy
                   of which is on file at the principal office of Mark
                   Twain, and to resale restrictions arising under the
                   Securities Act of 1933 and any applicable state se-
                   curities laws.  A copy of such agreement will be
                   provided to the holder hereof without charge upon
                   receipt by Mark Twain of a written request there-
                   for.


         It is understood and agreed that the above legend shall be

         removed by delivery of substitute certificate(s) without such

         legend if Mercantile shall have delivered to Bancshares an

         opinion of counsel, in form and substance reasonably satis-

         factory to Bancshares and its counsel, to the effect that

         such legend is not required for purposes of the Securities

         Act and any applicable state securities laws.


                   5.  Authorization, etc.


                   (a)  Bancshares hereby represents and warrants to

         Mercantile that: 


                   (i)  Bancshares has full corporate authority to ex-

              ecute and deliver this Option Agreement and, subject to

              Section 11(i), to consummate the transactions contem-

              plated hereby; 


                  (ii)  such execution, delivery and consummation have

              been authorized by the Board of Directors of Bancshares,



                                      -8-<PAGE>







              and no other corporate proceedings are necessary there-

              for; 


                 (iii)  this Option Agreement has been duly and val-

              idly executed and delivered and represents a valid and

              legally binding obligation of Bancshares, enforceable

              against Bancshares in accordance with its terms; and


                  (iv)  Bancshares has taken all necessary corporate

              action to authorize and reserve and, subject to Section

              11(i), permit it to issue and, at all times from the

              date hereof through the date of the exercise in full or

              the expiration or termination of the Option, shall have

              reserved for issuance upon exercise of the Option, 

              3,261,522 shares of Bancshares Common Stock, all of

              which, upon issuance pursuant hereto, shall be duly au-

              thorized, validly issued, fully paid and nonassessable,

              and shall be delivered free and clear of all claims,

              liens, encumbrances, restrictions (other than federal

              and state securities restrictions) and security inter-

              ests and not subject to any preemptive rights.  


                   (b)  Mercantile hereby represents and warrants to

         Bancshares that:  


                   (i)  Mercantile has full corporate authority to ex-

              ecute and deliver this Option Agreement and, subject to



                                      -9-<PAGE>







              Section 11(i), to consummate the transactions contemplated

              hereby; 


                  (ii)  such execution, delivery and consummation have

              been authorized by all requisite corporate action by Mer-

              cantile, and no other corporate proceedings are necessary

              therefor; 


                 (iii)  this Option Agreement has been duly and validly

              executed and delivered and represents a valid and legally

              binding obligation of Mercantile, enforceable against Mer-

              cantile in accordance with its terms; and


                  (iv)  any Bancshares Common Stock or other securities

              acquired by Mercantile upon exercise of the Option will

              not be taken with a view to the public distribution there-

              of and will not be transferred or otherwise disposed of

              except in compliance with the Securities Act.


                   6.  Adjustment upon Changes in Capitalization.


                   In the event of any change in Bancshares Common

         Stock by reason of stock dividends, split-ups, recapitaliza-

         tions or the like, the type and number of shares subject to

         the Option, and the purchase price per share, as the case may

         be, shall be adjusted appropriately.  In the event that any

         additional shares of Bancshares Common Stock are issued after

         the date of this Option Agreement (other than pursuant to an


                                      -10-<PAGE>







         event described in the preceding sentence or pursuant to this

         Option Agreement), the number of shares of Bancshares Common

         Stock subject to the Option shall be adjusted so that, after

         such issuance, it equals at least 19.9% of the number of

         shares of Bancshares Common Stock then issued and outstanding

         (without considering as outstanding any shares subject to or

         issued pursuant to the Option).


                   7.  Repurchase.


                   (a)  Subject to Section 11(i), at the request of

         Mercantile at any time commencing upon the occurrence of a

         Put Event (as defined below) and ending 13 months immediately

         thereafter (the "Repurchase Period"), Bancshares (or any suc-

         cessor entity thereof) shall repurchase the Option from Mer-

         cantile together with all (but not less than all, subject to

         Section 10) shares of Bancshares Common Stock purchased by

         Mercantile pursuant thereto with respect to which Mercantile

         then has Beneficial Ownership, at a price (per share, the

         "Per Share Repurchase Price") equal to the sum of:


                   (i)  The exercise price paid by Mercantile for any

              shares of Bancshares Common Stock acquired pursuant to

              the Option;








                                      -11-<PAGE>







                  (ii)  The difference between (A) the "Market/Tender

              Offer Price" for shares of Bancshares Common Stock (de-

              fined as the higher of (x) the highest price per share

              at which a tender or exchange offer has been made for

              shares of Bancshares Common Stock or (y) the highest

              closing mean of the "bid" and the "ask" price per share

              of Bancshares Common Stock on the New York Stock Ex-

              change Consolidated Tape (as reported in the Wall Street

              Journal or other authoritative source), for any day

              within that portion of the Repurchase Period which pre-

              cedes the date Mercantile gives notice of the required

              repurchase under this Section 7) and (B) the exercise

              price as determined pursuant to Section 2 hereof (sub-

              ject to adjustment as provided in Section 6), multiplied

              by the number of shares of Bancshares Common Stock with

              respect to which the Option has not been exercised, but

              only if the Market/Tender Offer Price is greater than

              such exercise price; and


                 (iii)  The difference between the Market/Tender Offer

              Price and the exercise price paid by Mercantile for any

              shares of Bancshares Common Stock purchased pursuant to

              the exercise of the Option, multiplied by the number of

              shares so purchased, but only if the Market/Tender Offer

              Price is greater than such exercise price.




                                      -12-<PAGE>







                   (b)  In the event Mercantile exercises its rights

         under this Section 7, Bancshares shall, within 10 business

         days thereafter, pay the required amount to Mercantile by

         wire transfer of immediately available funds to an account

         designated by Mercantile and Mercantile shall surrender to

         Bancshares the Option and the certificates evidencing the

         shares of Bancshares Common Stock purchased thereunder with

         respect to which Mercantile then has Beneficial Ownership,

         and Mercantile shall warrant that it has sole record and Ben-

         eficial Ownership of such shares and that the same are free

         and clear of all liens, claims, charges, restrictions and en-

         cumbrances of any kind whatsoever.  


                   (c)  In determining the Market/Tender Offer Price,

         the value of any consideration other than cash shall be de-

         termined by an independent nationally recognized investment

         banking firm selected by Mercantile and reasonably acceptable

         to Bancshares.


                   (d)  For purposes of this Section 7, a Put Event

         shall be deemed to have occurred (i) upon the consummation of

         any merger, consolidation or any similar transaction involv-

         ing Bancshares or any purchase, lease or other acquisition of

         all or a substantial portion of the assets of Bancshares or







                                      -13-<PAGE>







         (ii) upon the acquisition by any person of Beneficial Owner-

         ship of 50% or more of the then outstanding shares of Banc-

         shares Common Stock, provided that no such event shall con-

         stitute a Put Event unless a Purchase Event shall have oc-

         curred prior to expiration or termination of the Option.


                   8.  Repurchase at Option of Bancshares and First

         Refusal.


                   (a)  Except to the extent that Mercantile shall

         have previously exercised its rights under Section 7, at the

         request of Bancshares during the six-month period commencing

         13 months following the first occurrence of a Purchase Event,

         Bancshares may repurchase from Mercantile, and Mercantile

         shall sell to Bancshares, all (but not less than all, subject

         to Section 10) of the Bancshares Common Stock acquired by

         Mercantile pursuant hereto and with respect to which Mercan-

         tile has Beneficial Ownership at the time of such repurchase

         at a price per share equal to the greater of (i) 110% of the

         Market/Tender Offer Price per share, (ii) the Per Share Re-

         purchase Price or (iii) the sum of (A) the aggregate Purchase

         Price of the shares so repurchased plus (B) interest on the

         aggregate Purchase Price paid for the shares so repurchased

         from the date of purchase to the date of repurchase at the

         average rate of interest announced by Mercantile as its prime

         or base lending or reference rate during such period, less



                                      -14-<PAGE>







         any dividends received on the shares so repurchased, plus (C)

         Mercantile's reasonable out-of-pocket expenses incurred in

         connection with the transactions contemplated by the Merger

         Agreement, including, without limitation, accounting and in-

         vestment banking fees.  Any repurchase under this Section

         8(a) shall be consummated in accordance with Section 7(b).


                   (b)  If, at any time after the occurrence of a Pur-

         chase Event and prior to the earlier of (i) the expiration of

         18 months immediately following such Purchase Event or (ii) the

         expiration or termination of the Option, Mercantile shall de-

         sire to sell, assign, transfer or otherwise dispose of the Op-

         tion or all or any of the shares of Bancshares Common Stock ac-

         quired by it pursuant to the Option, it shall give Bancshares

         written notice of the proposed transaction (an "Offeror's No-

         tice"), identifying the proposed transferee, and setting forth

         the terms of the proposed transaction.  An Offeror's Notice

         shall be deemed an offer by Mercantile to Bancshares, which may

         be accepted within 10 business days of the receipt of such

         Offeror's Notice, on the same terms and conditions and at the

         same price at which Mercantile is proposing to transfer the Op-

         tion or such shares to a third party.  The purchase of the Op-

         tion or any such shares by Bancshares shall be closed within 10

         business days of the date of the acceptance of the offer and

         the purchase price shall be paid to Mercantile by wire transfer




                                      -15-<PAGE>







         of immediately available funds to an account designated by Mer-

         cantile.  In the event of the failure or refusal of Bancshares

         to purchase the Option or all the shares covered by the Offer-

         or's Notice or if the Board or any other Regulatory Authority

         disapproves Bancshares' proposed purchase of the Option or such

         shares, Mercantile may, within 60 days from the date of the

         Offeror's Notice, sell all, but not less than all, of the Op-

         tion or such shares to such third party at no less than the

         price specified and on terms no more favorable to the purchaser

         than those set forth in the Offeror's Notice.  The requirements

         of this Section 8(b) shall not apply to (i) any disposition as

         a result of which the proposed transferee would Beneficially

         Own not more than 2% of the voting power of Bancshares or (ii)

         any disposition of Bancshares Common Stock by a person to whom

         Mercantile has sold shares of Bancshares Common Stock issued

         upon exercise of the Option.


                   9.  Registration Rights.


                   At any time after a Purchase Event, Bancshares

         shall, if requested by any holder or beneficial owner of

         shares of Bancshares Common Stock issued upon exercise of the

         Option (except any beneficial holder who acquired all of such

         holder's shares in a transaction exempt from the requirements

         of Section 8(b) by reason of clause (i) thereof) (each a

         "Holder"), as expeditiously as possible file a registration



                                      -16-<PAGE>







         statement on a form for general use under the Securities Act

         if necessary in order to permit the sale or other disposition

         of the shares of Bancshares Common Stock that have been ac-

         quired upon exercise of the Option in accordance with the in-

         tended method of sale or other disposition requested by any

         such Holder (it being understood and agreed that any such

         sale or other disposition shall be effected on a widely dis-

         tributed basis so that, upon consummation thereof, no pur-

         chaser or transferee shall Beneficially Own more than 2% of

         the shares of Bancshares Common Stock then outstanding).

         Each such Holder shall provide all information reasonably re-

         quested by Bancshares for inclusion in any registration

         statement to be filed hereunder.  Bancshares shall use its

         best efforts to cause such registration statement first to

         become effective and then to remain effective for such period

         not in excess of 180 days from the day such registration

         statement first becomes effective as may be reasonably neces-

         sary to effect such sales or other dispositions.  The regis-

         tration effected under this Section 9 shall be at Bancshares'

         expense except for underwriting commissions and the fees and

         disbursements of such Holders' counsel attributable to the

         registration of such Bancshares Common Stock.  In no event

         shall Bancshares be required to effect more than one regis-

         tration hereunder.  The filing of the registration statement





                                      -17-<PAGE>







         hereunder may be delayed for such period of time as may rea-

         sonably be required to facilitate any public distribution by

         Bancshares of Bancshares Common Stock or if a special audit

         of Bancshares would otherwise be required in connection

         therewith.  If requested by any such Holder in connection

         with such registration, Bancshares shall become a party to

         any underwriting agreement relating to the sale of such

         shares, but only to the extent of obligating itself in re-

         spect of representations, warranties, indemnities and other

         agreements customarily included in such underwriting agree-

         ments for parties similarly situated.  Upon receiving any re-

         quest for registration under this Section 9 from any Holder,

         Bancshares agrees to send a copy thereof to any other person

         known to Bancshares to be entitled to registration rights un-

         der this Section 9, in each case by promptly mailing the

         same, postage prepaid, to the address of record of the per-

         sons entitled to receive such copies.


                   10.  Severability.


                   Any term, provision, covenant or restriction con-

         tained in this Option Agreement held by a court or a Regula-

         tory Authority of competent jurisdiction to be invalid, void

         or unenforceable, shall be ineffective to the extent of such







                                      -18-<PAGE>







         invalidity, voidness or unenforceability, but neither the re-

         maining terms, provisions, covenants or restrictions con-

         tained in this Option Agreement nor the validity or enforce-

         ability thereof in any other jurisdiction shall be affected

         or impaired thereby.  Any term, provision, covenant or re-

         striction contained in this Option Agreement that is so found

         to be so broad as to be unenforceable shall be interpreted to

         be as broad as is enforceable.  If for any reason such court

         or Regulatory Authority determines that applicable law will

         not permit Mercantile or any other person to acquire, or

         Bancshares to repurchase or purchase, the full number of

         shares of Bancshares Common Stock provided in Section 2 here-

         of (as adjusted pursuant to Section 6 hereof), it is the ex-

         press intention of the parties hereto to allow Mercantile or

         such other person to acquire, or Bancshares to repurchase or

         purchase, such lesser number of shares as may be permissible,

         without any amendment or modification hereof.


                   11.  Miscellaneous.


                   (a)  Expenses.  Each of the parties hereto shall

         pay all costs and expenses incurred by it or on its behalf in

         connection with the transactions contemplated hereunder, in-

         cluding fees and expenses of its own financial consultants,

         investment bankers, accountants and counsel, except as other-

         wise provided herein.



                                      -19-<PAGE>








                   (b)  Entire Agreement.  Except as otherwise ex-

         pressly provided herein, this Option Agreement and the Merger

         Agreement contain the entire agreement between the parties

         with respect to the transactions contemplated hereunder and

         supersedes all prior arrangements or understandings with re-

         spect thereto, written or oral.  


                   (c)  Successors; No Third Party Beneficiaries.  The

         terms and conditions of this Option Agreement shall inure to

         the benefit of and be binding upon the parties hereto and

         their respective successors and permitted assigns.  Nothing

         in this Option Agreement, expressed or implied, is intended

         to confer upon any party, other than the parties hereto, and

         their respective successors and assigns, any rights, reme-

         dies, obligations, or liabilities under or by reason of this

         Option Agreement, except as expressly provided herein.


                   (d)  Assignment.  Other than as provided in Sec-

         tions 8 and 9 hereof, neither of the parties hereto may sell,

         transfer, assign or otherwise dispose of any of its rights or

         obligations under this Option Agreement or the Option created

         hereunder to any other person (whether by operation of law or

         otherwise), without the express written consent of the other

         party.






                                      -20-<PAGE>







                   (e)  Notices.  All notices or other communications

         which are required or permitted hereunder shall be in writing

         and sufficient if delivered in accordance with Section 8.02

         of the Merger Agreement (which is incorporated herein by ref-

         erence).


                   (f)  Counterparts.  This Option Agreement may be

         executed in counterparts, and each such counterpart shall be

         deemed to be an original instrument, but both such counter-

         parts together shall constitute but one agreement.


                   (g)  Specific Performance.  The parties hereto

         agree that if for any reason Mercantile or Bancshares shall

         have failed to perform its obligations under this Option

         Agreement, then either party hereto seeking to enforce this

         Option Agreement against such non-performing party shall be

         entitled to specific performance and injunctive and other eq-

         uitable relief, and the parties hereto further agree to waive

         any requirement for the securing or posting of any bond in

         connection with the obtaining of any such injunctive or other

         equitable relief.  This provision is without prejudice to any

         other rights that either party hereto may have against the

         other party hereto for any failure to perform its obligations

         under this Option Agreement.


                   (h)  Governing Law.  This Option Agreement shall be

         governed by and construed in accordance with the laws of the


                                      -21-<PAGE>







         State of Missouri applicable to agreements made and entirely

         to be performed within such state.  Nothing in this Option

         Agreement shall be construed to require any party (or any

         subsidiary or affiliate of any party) to take any action or

         fail to take any action in violation of applicable law, rule

         or regulation.


                   (i)  Regulatory Approvals; Section 16(b).  If, in

         connection with (A) the exercise of the Option under Sec-

         tion 3 or a sale by Mercantile to a third party under Section

         8, (B) a repurchase by Bancshares under Section 7 or a repur-

         chase or purchase by Bancshares under Section 8, prior notif-

         ication to or approval of the Board or any other Regulatory

         Authority is required, then the required notice or applica-

         tion for approval shall be promptly filed and expeditiously

         processed and periods of time that otherwise would run pursu-

         ant to such Sections shall run instead from the date on which

         any such required notification period has expired or been

         terminated or such approval has been obtained, and in either

         event, any requisite waiting period shall have passed.  In

         the case of clause (A) of this subsection (i), such filing

         shall be made by Mercantile, and in the case of clause (B) of

         this subsection (i), such filing shall be made by Bancshares,

         provided that each of Mercantile and Bancshares shall use its

         best efforts to make all filings with, and to obtain consents

         of, all third parties and Regulatory Authorities necessary to


                                      -22-<PAGE>







         the consummation of the transactions contemplated hereby, in-

         cluding without limitation applying to the Board under the

         Holding Company Act for approval to acquire the shares issu-

         able hereunder.  Periods of time that otherwise would run

         pursuant to Sections 3, 7 or 8 shall also be extended to the

         extent necessary to avoid liability under Section 16(b) of

         the Exchange Act.


                   (j)  No Breach of Merger Agreement Authorized.

         Nothing contained in this Option Agreement shall be deemed to

         authorize Bancshares to issue any shares of Bancshares Common

         Stock in breach of, or otherwise breach any of, the provi-

         sions of the Merger Agreement.


                   (k)  Waiver and Amendment.  Any provision of this

         Agreement may be waived at any time by the party that is en-

         titled to the benefits of such provision.  This Option Agree-

         ment may not be modified, amended, altered or supplemented ex-

         cept upon the execution and delivery of a written agreement ex-

         ecuted by the parties hereto.















                                      -23-<PAGE>







                   IN WITNESS WHEREOF, each of the parties hereto has

         executed this Option Agreement as of the date first written

         above.


                                       MERCANTILE BANCORPORATION INC.


                                       By: /s/ Thomas H. Jacobsen     
                                          Name:  Thomas H. Jacobsen   
                                          Title: Chairman, President 
                                                 and Chief Executive
                                                 Officer


                                       MARK TWAIN BANCSHARES, INC.


                                       By: /s/ John P. Dubinsky       
                                          Name:  John P. Dubinsky
                                          Title: President and Chief
                                                 Executive Officer




























                                      -24-

                                                              EXHIBIT 99





         NEWS
         RELEASE        FOR IMMEDIATE RELEASE:  OCTOBER 28, 1996

         MERCANTILE
         BANCORPORATION INC.
         Mercantile Tower
         PO. Box 524
         St. Louis, MO       Contact:  Mercantile Bancorporation Inc.
         63166-0524                    Cheryl Karn     Diana Yates
                                       Public Affairs  Investor Relations
                                       (314) 425-8174  (314) 425-8237

                                       Mark Twain Bancshares, Inc.
                                       Keith Miller
                                       Chief Financial Officer
                                       (314) 889-0799



                        NYSE SYMBOL:  MTL
                        In newspaper stock tables generally MercBc or
                        MercBcpMO



                           MERCANTILE BANCORPORATION INC.
                      TO MERGE WITH MARK TWAIN BANCSHARES, INC.

                   ST. LOUIS -- Mercantile Bancorporation Inc., an $18.2

         billion asset bank holding company, and Mark Twain Bancshares,

         Inc. (NYSE-MTB), a $3.1 billion asset bank holding company,

         both headquartered in St. Louis, jointly announced today that

         they have signed a definitive merger agreement.  The

         transaction will be a tax-free exchange valued at approximately

         $855 million.

                   "This merger of Mark Twain with Mercantile brings

         together the strengths of two high-performing organizations and

         solidifies Mercantile's position as the largest locally

         managed,



                                     -more-<PAGE>





         Mercantile And Mark Twain To Merge--First Add




         and independently owned banking operation in St. Louis and the

         state of Missouri," said Thomas H. Jacobsen, chairman and chief

         executive officer of Mercantile Bancorporation Inc.

                   "It is a compelling transaction that will harness the

         middle market lending and other specialty businesses of Mark

         Twain with the power and breadth of Mercantile's operation,"

         Jacobsen added.  "Both institutions are generating strong

         revenue growth, increasing market share and earnings momentum.

         We're convinced that the synergies between our two institutions

         will create a highly competitive banking organization with

         long-term benefits for our customers, employees and

         shareholders."

                   "This is great news for St. Louis and Kansas City at

         a time of rapid change in the financial services industry.  We

         are very pleased to partner with Mercantile Bancorporation and

         form a merged banking entity in which everyone benefits," said

         John P. Dubinsky, president and chief executive officer of Mark

         Twain Bancshares, Inc.

                   "Customers of Mark Twain will benefit from the

         extensive array of consumer products and services developed by

         Mercantile.  Both organizations have outstanding CRA records

         and together will continue to provide civic leadership in the

         region," Dubinsky said.

                   Mark Twain Directors unanimously approved the

         transaction and have indicated that they will vote their shares

         in favor of the merger.

                   Under the terms of the agreement, Mark Twain

         shareholders will receive .9520 shares of Mercantile common

         stock for each share of Mark Twain common stock.  The merger is

         structured as a tax-free exchange and will be accounted for as

         a pooling of interests.  Based on



                                      -more-<PAGE>





         Mercantile And Mark Twain To Merge--Second Add




         Friday's closing price for Mercantile common stock of $52.125,

         the transaction is valued at $49.62 per share of Mark Twain

         common stock.

                   In addition, both Mercantile and Mark Twain will

         rescind all previously announced share repurchase programs.

         Mercantile may repurchase up to 700,000 shares in the open

         market from time to time depending upon market conditions and

         other factors.

                   Mark Twain Bancshares, Inc., one of the highest

         performing banks in the country, has 39 banking locations in

         the St. Louis and Kansas City areas.  Mark Twain's related

         financial services companies include:  Mark Twain Capital

         Markets Group; Mark Twain Brokerage Service, Inc.; Mark Twain

         Commercial Finance Division; Mark Twain International Division

         and Mark Twain Trust.

                   The merger strengthens Mercantile's presence in the

         three largest Missouri markets, increasing market share in the

         Kansas City metropolitan area from fourth to third; and, moving

         Mercantile to a stronger second in market share in the St.

         Louis area.  Mark Twain's pending acquisition in Springfield,

         Missouri will further increase Mercantile's market share by

         approximately 20% in the Springfield area.

                   Upon completion of the merger, Alvin J. Siteman,

         chairman of Mark Twain Bancshares, Inc., will become Chairman

         of Mercantile Bank of St. Louis, and will join the Mercantile

         Bancorporation Inc. Board of Directors.  In addition, John P.

         Dubinsky, will become president and chief executive officer of

         Mercantile Bank of St. Louis and a member of Mercantile's

         management executive committee, reporting to Thomas H.

         Jacobsen, Peter F. Benoist, executive



                                      -more-<PAGE>





         Mercantile And Mark Twain To Merge--Third Add




         vice president, banking division, Mark Twain Bancshares, Inc.,

         will join Mercantile Bank of St. Louis as a key member of the

         management team.  Joseph E. Hasten, the current president of

         Mercantile Bank of St. Louis, will assume the position of

         chairman and chief institutional banking officer of

         Mercantile's Corporate Bank serving the specialized financial

         needs of Mercantile's commercial customers throughout the

         Midwest, reporting to W. Randolph Adams, senior executive vice

         president of Mercantile Bancorporation Inc.

                   Plans call for the merger, which is subject to the

         approval of Mercantile and Mark Twain shareholders and all

         appropriate regulatory agencies, to be completed in the second

         quarter of 1997.



                                       ###


         Mercantile Bancorporation Inc., an $18.2 billion multi-bank
         holding company headquartered in St. Louis, operates banks in
         Missouri, Iowa, Kansas, Illinois and Arkansas.  The company has
         mergers pending with Today's Bancorp, Inc., First Financial
         Corporation of America, and Regional Bancshares, Inc.
         Mercantile's non-banking subsidiaries include companies
         providing brokerage services, asset-based lending, investment
         advisory services, leasing services and credit life insurance.


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