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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. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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