(a) In this section, “transverse dimension” means the measurement across both shells of a hard-shell clam at the widest point perpendicular to the hinge line where the two shells meet.

(b) A clam dealer may possess hard-shell clams having a transverse dimension of less than the size required by the Department if the dealer offers a bill of lading approved by the Department as proof that all clams were caught in waters outside the State.