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Drawing illustrating the various degrees of union of the mantle lobes: 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.b., anal and branchial siphons; 1, 2, 3, first, second and thrid points of closure of mantle; b.a., byssal aperture

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