Proceedings of the United States National Museum, 1925, Vol. 64 (Classic Reprint)

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Excerpt from Proceedings of the United States National Museum, 1925, Vol. 64Shell attaining a large size, fusiform, conical or ovate, cross sec tion triangular or circular, early whorls bearing varices, entirely concealed in adult Shells, after 7 to 10 volutions, outer lip extending to tip of spire and in each succeeding volution completely enveloping spire, space between spire and each enveloping whorl filled with callus, later whorls smooth, or sculptured with narrow spiral threads on and below the shoulder, aperture elliptical, gradually constricted posteriorly into a narrow channel ascending the spire, outer lip thin except at posterior end of aperture, expanded, bearing near the base a very shallow sinus, siphonal notch at base of aperture wide and very deep, anterior fasciole swollen, base of columella slender, curved backward, undercut by siphonal notch, columellar callus thickened at base of posterior channel, thinner over inner lip and extending' to base of columella, base of body whorl of young shells sculptured with spiral sulci that widen toward the base.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.