Excerpt from A History of British Mollusca, Vol. 3: And Their Shells Shell hemispherically ovate, oblique, imperforate, with a. Spire of few whorls, last whorl very large; columella flattened, smooth, or slightly denticulated, forming a nearly straight sharp-edged border to the inner side of the hemispherical mouth; surface smooth, or striated, or spi nous, protected by an epidermis; operculum obliquely Innate, solid, corneo-calcareous, with a tooth on its lower margin. Animal with two slender tentacula, with detached eye bearing sus-tentacula at their external bases. Foot rather short, triangularly oblong. Structure of the tongue (as observed by Loven) complicated; each transverse series of teeth has a. Minute central denticle, flanked by three laterals, of which the first is largest, transversely -ex panded and laminar, the second and third minute, and bounded by numerous uncini, the first of them very large, broadly hooded and denticulated, the remainder narrow and linear. 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.