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Smithsonian Contributions to Knowledge Volume 26 (Paperback) Loot Price: R320
Discovery Miles 3 200
Smithsonian Contributions to Knowledge Volume 26 (Paperback): Smithsonian Institution

Smithsonian Contributions to Knowledge Volume 26 (Paperback)

Smithsonian Institution

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Loot Price R320 Discovery Miles 3 200

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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. 1890 Excerpt: ... next branch, in which the highly aberrant compressed Ast. Callenoti appeared. This aberrant tendency was still more decidedly brought out in the more rapid production of similar, but more compressed and involute, forms in Oxynoticeras. In this, also, the highest specialization was reached by the introduction of a new structure, the hollow keel, as a nealogic and ephebolic characteristic. The smooth variety of Psil. planorbe, and its immediate congener, Psil. caliphylr htm, were of course the most primitive forms which occurred in the Lias, and we can treat the whole of the two stocks as a connected group arising in Central Europe from the smooth variety of planorbe, though, as a matter of fact, this is probably artificial. The actual process of the evolution of the second branch, and probably of Caloceras, as will be explained in Chapter III., took place in the basin of the Northeastern Alps, and the forms found in Central Europe were migrants. When arranged naturally the genera appear as in the Summary Plates, as an assemblage of distinct and more or less divergent series. We have considered each separate genetic series as a genus, because it was necessary to do this, or else use a cumbersome trinomial or quadrinomial descriptive nomenclature. Even with the aid of binomials, we have not been able to speak of any series under one name as a single species. Had this rule been adopted, i. e. to treat each series as a single species, the opinions of paleontologists are not now in its favor, and probably no one would have followed us in practice, however much disposed theoretically to praise our conservatism. Even Quenstedt in his most recent work has proposed names for the different groups of Arietidae all ending in "ceras." They are highly appropria...


Imprint: Rarebooksclub.com
Country of origin: United States
Release date: May 2012
First published: 2010
Authors: Smithsonian Institution
Dimensions: 246 x 189 x 11mm (L x W x T)
Format: Paperback - Trade
Pages: 204
ISBN-13: 978-1-153-15602-8
Categories: Books
LSN: 1-153-15602-4
Barcode: 9781153156028

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