Download Palaeontographical Society Monographs Volume 37, Nos. 174-179

Download Palaeontographical Society Monographs Volume 37, Nos. 174-179

Palaeontographical Society Monographs Volume 37, Nos. 174-179 by Anonymous

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Author: Anonymous
Page Count: 124 pages
Published Date: 13 Sep 2013
Publisher: Rarebooksclub.com
Publication Country: United States
Language: English
Format: eBook
ISBN: 9781230023618
Download Link: Palaeontographical Society Monographs Volume 37, Nos. 174-179
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 edition. Excerpt: ...as C'. Z0n_r/z'rostris and 0. varians of Billings. I am therefore unable to concur in the opinion expressed by Mr. S. A. Miller in his valuable Catalogue of the Genera and Species of the American Palaeozoic Fossils (1877), namely, that Triplesia is a synonym of Camarella, nor can I admit that the numerous species he classes under Camarella all belong to that genus. Neither Hall nor Billings has sufficiently defined the characters of the genera they have established, nor have they described the internal characters; thus much confusion has prevailed with respect to their true generic value. Triplesia does not appear to have had spiral supports for the labial appendages. In my ' Silurian Monograph ' I followed M'Coy, Phillips, Salter, and others, while erroneously describing the T01." insularis of Eichwald as a species of Orlliis. Since then, the finding of well-preserved internal casts and isolated valves enables me to refer that species to Hall's Trz'plesz'a. Thanks to the kindness of Mr. Whitfield, I have also been able to examine typical examples of T. ewfans and T. Ortoni. The cardinal process in the last-named form is very remarkable. It is more or less developed in different species of the genus. 'In T. Ortoml it is unusually large, measuring about one third of the length of the dorsal valve; it is much thickened and rounded at and near its base (a), with a projection at each of its lateral extremities (6); the stem of the process (0) is nearly cylindrical, about a line and a half in length, when it bifurcates and forms:1' "lV;__ 11., -_;, -, O, ., m-, eek' W two smaller diverging branches, each of which ni_easures 1'D'"'l"l_"@=...

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