Excerpt from The Mineral Conchology of Great Britain, Vol. 2: Or Coloured Figures and Descriptions of Those Remains of Testaceous Animals or Shells, Which Have Been Preserved at Various Times and Depths in the Earth Age makes a great difference in the form of the whorls of this shell, the young. Ones being roundish, and having numerous sharp radii in sets, composed of one long one very prominent at the commencement, and from two to five about two-thirds the length, and all passing over the front. The outer whorls of full grown shells are triangular, the two inner angles being truncated, so as to give the shell an umbilicate appearance; the surface is largely undulated, wrinkled near the back, and has many irregular striae in the place of radii: the inner surface differs from the outer only in the larger whorls being free from striae and losing the radii sooner. 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.