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On the Development of the Cetacea; Together with a Consideration of the Probable Homologies of the Flukes of Cetaceans and Sirenians (Paperback) Loot Price: R326
Discovery Miles 3 260
On the Development of the Cetacea; Together with a Consideration of the Probable Homologies of the Flukes of Cetaceans and...

On the Development of the Cetacea; Together with a Consideration of the Probable Homologies of the Flukes of Cetaceans and Sirenians (Paperback)

John Adam Ryder

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Loot Price R326 Discovery Miles 3 260

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1887. Excerpt: ... It now remains for me to present the data and the conclusions to be drawn therefrom in support of the hypothesis stated at the outset, and in order to render the evidence as conclusive as possible it will be necessary to consider the subject under discussion, first, in relation to the organization of the adult whales, compared with that of the Pinnipedia; secondly, in relation to the modes of development of the marine and land mammals, entering into the discussion of special sets of structures and their bearings upon the questions involved. I.--The Contrasts Between The Marine, Amphibious, And TerRestrial, MAMMALIA. (1) External form.--As remarked by Huxley, in the Cetacea "the form of the body is still more fish-like than in the Sirenia." This is a trait especially well marked in the existing genera Physalus and Leucorhamphus, in which the caudal peduncle is vertically expanded as in fishes, with high carina on the dorsal and ventral aspects. This fishlike physiognomy is intensified by the development of the median dorsal integument into a rigid fin-like integumentary fold, filled up with tough non-contra-tile connective tissue, and with adipose cells filling in the meshes between the fibers. There is a superficial layer of very tough fibers just under the integument, which runs parallel with the anterior sloping border of the fin. The medullary fibers are for the most part disposed horizontally and constitute the bulk of its middle or central substance. Blood-vessels, and probably nerves, enter the base of the fin, and transverse its medulla in the plane of the vertical median line of the body, not being evident superficially. Beyond their outward resemblance they have no morphological likeness to the mobile dorsal fins of fishes, which are actuate...

General

Imprint: General Books LLC
Country of origin: United States
Release date: 2012
First published: 2012
Authors: John Adam Ryder
Dimensions: 246 x 189 x 2mm (L x W x T)
Format: Paperback - Trade
Pages: 30
ISBN-13: 978-1-235-60897-1
Categories: Books
LSN: 1-235-60897-2
Barcode: 9781235608971

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