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Excerpt from The Nautilus, Vol. 25: A Monthly Journal Devoted to the Interests of Conchologists; May, 1911, to April 1912 In young, and even many half-grown specimens, there is plainly a single cardinal tooth, strongly curved. With advancing age there appears an indentation in the middle (above), as the anterior and posterior parts are growing more. They grow also in thickness, even the thinner anterior often becomes grooved, and at the same time the whole tooth becomes more curved, resp. Angular, resembling the two in the left valve (inversely). But a careful examination will show that the two shanks are connected. 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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