Manual of Conchology; Structural and Systematic, Vol. 1: With Illustrations of the Species (Classic Reprint) - Softcover

Tryon, George W.

9781331945833: Manual of Conchology; Structural and Systematic, Vol. 1: With Illustrations of the Species (Classic Reprint)

Softcover

ISBN 10: 1331945836 ISBN 13: 9781331945833

Verlag: Forgotten Books, 2019

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Excerpt from Manual of Conchology; Structural and Systematic, Vol. 1: With Illustrations of the Species

Behind the arms the circle of which may constitute its crown, that major portion of the head is situated which is usually dis tinctively so designated its dorsal aspect exhibits on either side an eye. The head may be joined to the body by a more or less constricted neck, or is frequently sessile upon the latter, without intervening constriction. The body, or mantle, is dorsally more or less continuous with the head, but ventrally forms a sack anteriorly open, and from which emerges the funnel or siphon (which may also be regarded as a modification of a portion of the foot of the gasteropoda). The sack or body is, in a small portion of the octopod and in the decapod species, expanded into postero lateral membranes, possessing the power of undulatory motion, and which may be considered as the equivalent of fins, in func tion, though not in appearance.

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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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Rese�a del editor

Excerpt from Manual of Conchology; Structural and Systematic, Vol. 1: With Illustrations of the Species

J' The nervous system and phylogeny of the cephalopoda have been studied by Hermann von J hering (leipzig, who states as a result of his researches upon the homologies of the ganglias and nerves, that the arms of the cephalopods in no way represent the foot of the gasteropoda, but are tentacular growths of the head that the only part of the cephalo pod analogous to the foot of the gasteropod, is the siphon.

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.

Rese�a del editor

Excerpt from Manual of Conchology; Structural and Systematic, Vol. 1: With Illustrations of the Species

I propose to compile a Conchological Manual, which, whilst more comprehensive than any similar work hitherto published, shall be so condensed in text and illustration that it may be issued at a much more moderate price. It will include, in systematic order, the diagnoses of all the genera and higher divisions of the mollusca, both recent and fossil, and the descriptions and figures of all the recent species; together with the main features of their anatomy and physiology, their embryology and development, their relations to man and other animals, and their geological and geographical distribution.

The material at my disposal for the purpose of working up this comprehensive plan is ample and unexcelled:

I. - The Library of the Academy of Natural Sciences of Philadelphia contains almost every separate work ever published upon the subject, together with the various volumes of voyages and travels, of general natural history, and especially scientific periodicals, and the published transactions of learned societies throughout the world. For Conchological purposes this library is almost complete, and it is very rarely that its shelves do not afford any reference desired.

II. - The Conchological Museum of the same institution ranks among the largest in the world in the number of species represented, whilst in the richness of its geographical suites, the number of specimens illustrating varietal forms, etc., it is probably the finest collection extant.

It is intended to arrange and describe the valid species in accordance with their inter-relationships, and it is hoped that by so doing their number may be greatly reduced. Every genus and every recent species will be fully illustrated, so far as specimens or hitherto published figures will enable me to do so. The experienced skill of Dr. E. J. Nolan, who has undertaken to furnish the illustrations (of which 30,000 to 40,000 will be required), will sufficiently guarantee the accuracy of this department of the Manual.

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.