The American Geologist, Vol. 16 (Classic Reprint)
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| Stand: | 2015-08-04 03:50:33 |
Produktbeschreibung
Excerpt from The American Geologist, Vol. 16 The discovery and description of this genus by Prof. J. M. Clarke has materially added to our knowledge of the structure and development of the siphon in the Endoceratidæ and thrown a new light upon the affinities of the forms of this group. The endosiphon is absent in the maturer stages of Nanno and probably also in Vaginoceras, and in Sannionites it appears to be present only in a fragmentary form in some species. Prof. Clarke´s original specimens in the young of Nanno and that it was in one stage an open tube. This gives a standard by which to judge of the affinities of the genera in the Endoceratidæ and shown clearly that Endoras is the radical from which the genera Sannionites, Nanno and Vaginoceras were derived. Prof. Clarke having generously allowed me to study his types, I have made careful observations upon these interesting fossils. The specimens figured in his plate, figures 5-7, are in my opinion the young of figure 1, as described a full grown siphon of a specimen older obviously than figure 1. 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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