1052                             LAWS OF MARYLANDd                        [CH. 636

equal to the sum of the taxes which would be imposed by [Sections
1400 and 1410 of] the Federal Insurance Contributions Act if the
services covered by the agreement constituted employment within
the meaning of that Act;

(3)   Such agreement shall be effective with respect to services in
employment covered by the agreement perfornled after a date speci-
fied therein, but in no event may it be effective with respect to any
services performed prior to the first day of the calendar year in which
such agreement is entered into or in which the modification of the
agreement making it applicable to such services, is entered into
except that a modification entered into after December 31, 1954, and
prior to January 1, 1958, may be effective with respect to services
performed after December 31, 1954, or after a later date specified in
such modification;

(4)   All services which (a) constitute employment as defined in
§ 32, (b) are performed in the employ of the State of Maryland and
a political subdivision of the State and (c) are covered by a plan which
is in conformity with the terms of the agreement and has been
approved by the State Agency under § 34, shall be covered by the
agreement;

(5)   All services which (a) constitute employment as defined in
Section 32, (b) are performed in the employ of a political subdivision
of the State, and (c) are covered by a plan which is in conformity with
the terms of the agreement and has been approved by the State
Agency under Section 84, shall be covered by the agreement;

(6)  As modified, the agreement shall include all services described
in either paragraph (4) of OR paragraph (5) of this sub-section and
performed by individuals to whom Section 218 (c) (3) (C) of the
Social Security Act is applicable, and shall provide that the service
of any such individual shall continue to be covered by the agreement
in case he thereafter becomes eligible to be a member of a retirement
system; and

(7)  As modified, the agreement shall include all services described
in either paragraph (4) or paragraph (5) of this subsection and per-
formed by individuals in positions covered by a retirement system
with respect to which the Governor has issued a certificate to the
Secretary of Health, Education and Welfare pursuant to Section 88
(b) of this sub-title.

(b) (Interstate Instrumentality) Any instrumentality jointly
created by this State and any other State or States, is hereby author-
ized, upon the granting of like authority by such other State or
States, (1) to enter into an agreement with the [Federal Security
Administrator] Secretary of Health, Education and Welfare whereby
the benefits of the Federal Old Age and Survivors Insurance System
shall be extended to employees of such instrumentality, (2) to require
its employees to pay (and for that purpose to deduct from their
wages) contributions equal to the amounts which they would be
required to pay under Section 34 (d) (2) if they were covered by an
agreement made pursuant to Section (a) of this section and (3) to
make payment to the Secretary of the Treasury in accordance with
such agreement, including payments from its own funds and other-