British Conchology, or an Account of the Mollusca Which Now Inhabit the British Isles and the Surrounding Seas, Vol. 5

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Excerpt from British Conchology, or an Account of the Mollusca Which Now Inhabit the British Isles and the Surrounding Seas, Vol. 5: Marine Shells, and Naked Mollusca to the End of the Gastropoda, the Pteropoda, and Cephalopoda, With a Supplement and Other Matter, Concluding the Work Body slug-like, semioval when at rest, but capable of con siderable extension, of a ¿eshy substance: mantle enveloping the upper portion Of the body, and covering the greater part of the shell in those genera which have one: head snout shaped, prominent: mouth vertical, armed with large and strong jaws: odontophore having in the middle a single row of rhachidal teeth and on each side a row of numerous uncinate or hook - like teeth: tentacles apparently 4, separate, the front or false pair resemble lips, and the hinder or true pair are semitubular and not unlike the ears of a quadruped: eyes small, sessile, in front of the hinder or true tentacles: foot large, attached to the body throughout its whole length, it expands on each side, so as to form two lobes, which interfold over the back and are in many genera used for swimming gills placed in a particular cavity or receptacle towards the posterior part of the back, and protected by the mantle gizzarcl composed of several cartilaginous plates: vent placed behind the branchial cavity. Each individual is of both sexes, the organs of generation are separated and situate at the op posits extremities of the body. Shell present in some genera only, usually internal and for the most part concealed by the mantle, it is shield-shaped, thin, and slightly convolute at the smaller end, which is thick ened and furnished inside with a small tubercle or projection spire extremely short and terminal, coated over and concealed in the adult, but heterostrophe in the fry: mouth extending the whole length of the shell. 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.