A Monograph Of The Fossil Malacostracous Crustacea Of Great Britain

Author : Thomas Bell
Publisher : Forgotten Books
ISBN 13 : 9780331806519
Total Pages : 192 pages
Book Rating : 4.8/5 (65 download)

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Download or read book A Monograph of the Fossil Malacostracous Crustacea of Great Britain written by Thomas Bell and published by Forgotten Books. This book was released on 2017-11-23 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from A Monograph of the Fossil Malacostracous Crustacea of Great Britain: I, II. London Clay, Gault, and Greensand IN examining the zoological characters of the Crustacea which existed during the Eocene period, it is impossible not to be struck by the fact, that notwithstanding the obvious relation in most of them to the members of recent groups, amounting often to an almost typical representation of a family, there is at the same time, probably without exception, such a discrepancy as forbids their association under the same generic formula. In some few cases, indeed, it has been difficult, in consequence of that general destruction of the minute but very important organs about the oral, antennary, and ophthalmic regions, which too often prohibits any very correct appreciation of the relations of the species, to assign to the extinct form its true place amongst its recent allies. But ordinarily there have been, amongst the numerous specimens which I have been so fortunate as to have placed at my disposal, some which have sufficed to indicate their affinities with great probability, if not with absolute precision; and these have led me to adopt the conclusion above stated, which is somewhat at variance with the recognised relation between the Eocene and more recent forms of most other classes of animals, of which representatives are found even in that early member of the tertiary series. In making the necessary comparisons, and in endeavouring to assign to the different characters and structures their absolute or relative importance, I have found it requisite to investigate with some care the homologies of the different regions and subordinate portions of the carapace, as it happens too often that we are driven to that part, almost exclusively, as the basis of our diagnosis. I will, therefore, make a few remarks on this important element in our generalization, before I enter upon the detailed application of these data to the determination and description of the objects themselves. 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.