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Diagram illustrating the various stages in the closing of the mantle in Pelecypoda:
A, Mantle completely open:
B, rudiments of siphons, mantle still completely open;
C, mantle closed at one point;D, mantle closed at two points, with complete formation of siphonal apertures;
E, development of siphons, ventral closure more extended;
F, mantle closed at three points, with fourth orifice:
f, foot; s.a., s.h, anal and branchial siphons; 1, 2, 3, first, second and third points of closure of mantle

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