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Excerpt from British Conchology, Vol. 4: Or an Account of the Mollusca Which Now Inhabit the British Isles and the Surrounding Seas Body rather slender: mantle furnished at the upper corner (and in some species also at the lower corner) of the mouth of the shell with a minute tentacular process: head depressed above and extended in front, where it forms a long and stout snout - like projection, which is divided at the extremity into two lobes, that serve as lips; it is armed with a pair of jaws and a very short spinous tongue: tentacles wholly or partially setose or hairy; tips blunt: eyes on small prominences or tubercles, one at the outer base of each tentacle: gills composed of from a dozen to twenty separate strands: foot lanceolate, narrow, double-edged, broader and more or less truncated in front, some what contracted in the middle, and pointed behind sole grooved down the middle for about half its length towards the tail, whence it emits a glutinous thread by which the animal suspends itself to foreign bodies or to the surface of the water opercular lobe large, divided into two wing-like expansions; beneath it at its hinder extremity issues a short tentacular appendage, which is in some species double or triple. Shell oblong or oval, seldom umbilicate: epidermis very slight: spire usually elongated: mouth oval or trumpet-shaped, angulated above and slightly expanded below; its lips or mar gins are continuous. 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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