§ 284. Agreement; filing and provisions thereof. The agreement when approved by the superintendent of financial services shall be executed by the savings banks parties thereto and filed in his office. The agreement may be executed in any number of counterparts, all of which taken together shall constitute the original. The agreement shall name the trustee and contain suitable provisions for the removal or resignation of the trustee, or if the trustee named be a board of trustees, for the removal or resignation of any or all of them, and for the appointment of a successor trustee or for the filling of vacancies in such board of trustees, whether caused by death, resignation, disqualification or removal; it shall also provide the amount of the initial contributions to the fund and the manner of making subsequent calls, and may contain such limitations thereon as the superintendent shall approve, but all such initial contributions to the fund and payments pursuant to further calls shall be made ratably by all the member banks in proportion to their several deposit liabilities, except that the superintendent of financial services may exempt from any such call in whole or in part any member bank or banks the condition of which makes such exemption in his opinion desirable; it may also provide for the liquidation of the fund pursuant to rules and regulations for that purpose acceptable to the superintendent of financial services, provided that on any such liquidation the liabilities incurred or assumed by the trustee pursuant to the provisions hereof shall first be paid and the balance, if any, be distributed among the member banks pro rata according to their contributions; and the agreement may similarly provide for the change or amendment thereof with the approval of the superintendent of financial services and with such approval may be amended in such manner as may be provided therein; and the agreement shall also define the powers of the trustee, which may be all or any one or more or the powers hereinafter set forth, together with any additional powers not inconsistent with the powers herein enumerated or with the purposes of the fund, set forth in the agreement.