*211 Whittemore, J.

These four bills in equity seek declarations under Gr. L. c. 231A as to the effect of Gr. L. c. 32, § 91A, inserted by St. 1958, c. 684, § 1 (approved as an initiative law in the election of November 4,1958), upon the rights of three police officers of the city of Boston and one police officer of the city of Worcester who had been retired for accidental disability (total and permanent incapacity). Two of the plaintiffs, former Boston police officers, were retired on July 1, 1939, and September 1, 1942, respectively, under St. 1922, c. 521, § 13, a special statute which established the Boston retirement system. The other plaintiffs were retired under G. L. c. 32, § 7, on, respectively, December 1, 1952, and February 1, 1956. The eases were consolidated in the Superior Court and reserved and reported without decision. The Attorney General having been notified under G. L. c. 231A, § 8, has appeared and taken part.

Section 91A requires, in substance, that a person “pensioned or retired under any general or special law for disability, including accidental disability” refund so much of his adjusted pension or retirement allowance for any year as, when added to his earnings for that year, exceeds “the regular compensation which would have been payable to such person in such . . . year had he continued in service in the grade held by him at the time he was pensioned or retired.”

The plaintiffs rely upon G. L. c. 32, § 25 (5), as appearing in St. 1956, c. 525, which we discuss below. They concede that apart from this statute it is established that members of contributory retirement systems have no vested or contractual rights in the statutory benefits. Foley v. Springfield, 328 Mass. 59, 61. Kinney v. Contributory Retirement Appeal Bd. 330 Mass. 302, 304-306. Roach v. State Bd. of Retirement, 331 Mass. 41. McCarthy v. State Bd. of Retirement, 331 Mass. 46, 47-48.

The retroactive application of § 91A is made express by St. 1958, c. 684, § 2.

Section 25 (5) of c. 32 provides: “The provisions of sections one to twenty-eight, inclusive, and of corresponding *212 provisions of earlier laws shall be deemed to establish and to have established membership in the retirement system as a contractual relationship under which members who are or may be retired for superannuation are entitled to contractual rights and benefits, and no amendments or alterations shall be made that will deprive any such member or any group of such members of their pension rights or benefits provided for thereunder, if such member or members have paid the stipulated contributions specified in said sections or corresponding provisions of earlier laws.”

We agree with the contention of the defendants and the Attorney General that § 25 (5) applies to members of a retirement system governed by G. L. c. 32, §§ 1-28, or corre-spending provisions of earlier laws who are “retired for superannuation.” This construction is required to give meaning to the quoted words. Their significance is confirmed by reference to the proposals which preceded the statute as enacted. 1955 House Doc. No. 2821, general in terms, failed of enactment (1955 Senate Journal, p. 1405). While the bill was pending, however, there had been a proposal in the Senate (ibid. 1315; Senate Doc. No. 805) to amend the bill to insert the words “retired for superannuation.” In 1956 House Doc. No. 2805 was recommended by the committee (1956 House Journal, p. 883) based on House Docs. No. 332 and No. 1168; all three bills were general in terms. A Senate amendment (1956 Senate Journal, p. 1128) inserted the words “who are or may be retired for superannuation.” See, for passage, 1956 Senate Journal, p. 1259; 1956 House Journal, p. 1729.

We hold that the specification “retired for superannuation” controls the generality of the prior words: “shall be deemed to establish and to have established membership in the retirement system as a contractual relationship.”

We do not agree with the plaintiffs that this construction is to be rejected because it makes an unreasonable distinction between pensioners. Bases for the distinction can be found and the express language may be taken to reflect them.

*213 We reject also the plaintiffs’ contention that since they might be recalled to active service under Gf. L. c. 32, § 8 (2) (or St. 1922, c. 521, § 19), and, if recalled, might thereafter be retired for old age, they are persons who “may be retired for superannuation.” We hold that the statute in using the words “are or may be retired” intended to provide for retroactive and future application of the act in respect of persons retired for superannuation.

We do not reach the question whether § 25 (5) has any application to persons retired under St. 1922, c. 521.

A decree is to enter in each case declaring that Gf. L. c. 32, § 91A, is applicable to the plaintiff.

So ordered.