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Excerpt from The Nautilus, Vol. 23: A Monthly Journal Devoted to the Interests of Conchologists; May, 1909, to April, 1910 It is to be noted that. Say, with his usual nice observation, de scribes the minute, revolving lines which are still characteristic of the Delaware River form, and which are not. Uncommon in Specimens from other localities. In many instances, however, they are entirely lacking. Say described his species as sinistral. Without going into the question as to whether the shell is really sinistral or ultra-dextral, it may be said that with the exception of Say's original figures, and those of Call (rep. Dept. Geo]. Ind., 1899, p. 411, pl. Viii, fig. All the published illustrations known to the writer treat it as dextral, and in accordance with this practically universal custom the figures for the present paper have been drawn in that position. Those who prefer to consider the shell as sinistral have only to reverse the plate. 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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