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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