Manual of Conchology; Structural and Systematic, Vol. 1: With Illustrations of the Species (Classic Reprint) - Softcover

Tryon, George W.

 
9781331945833: Manual of Conchology; Structural and Systematic, Vol. 1: With Illustrations of the Species (Classic Reprint)

Synopsis

Excerpt from Manual of Conchology; Structural and Systematic, Vol. 1: With Illustrations of the Species

Behind the arms the circle of which may constitute its crown, that major portion of the head is situated which is usually dis tinctively so designated its dorsal aspect exhibits on either side an eye. The head may be joined to the body by a more or less constricted neck, or is frequently sessile upon the latter, without intervening constriction. The body, or mantle, is dorsally more or less continuous with the head, but ventrally forms a sack anteriorly open, and from which emerges the funnel or siphon (which may also be regarded as a modification of a portion of the foot of the gasteropoda). The sack or body is, in a small portion of the octopod and in the decapod species, expanded into postero lateral membranes, possessing the power of undulatory motion, and which may be considered as the equivalent of fins, in func tion, though not in appearance.

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Other Popular Editions of the Same Title

9783337803452: Manual of Conchology, Structural and Systematic: Vol. 1

Featured Edition

ISBN 10:  3337803458 ISBN 13:  9783337803452
Publisher: hansebooks, 2019
Softcover