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Excerpt from A Monograph of the Limniades and Other Freshwater Univalve Shells of North America Shell conoid, whirls convex, modifying the spiral cavity: aperture ovate or subrotund, widest anteriorly, the margins united, sharp, and never re ected: aperture closed with a thin corneous Opercle, of which the lines of increase are generally concentric. 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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9781333351120

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