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Transactions of the Wagner Free Institute of Science of Philadelphia Volume 3, Pts. 3-4

Transactions of the Wagner Free Institute of Science of Philadelphia Volume 3, Pts. 3-4


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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. 1895 Excerpt: ...type. L. erassicardo, however, is a true member of the group. But to this species he adds Pectcn nodosus and its allies, which are not entitled to be admitted. Fischer, in citing Conrad, ignores the original description and mentions P. nodosus as the type, which it never was, and thus subsequent writers were led into error. The modif1cation of the original 73 TERTIARY FAUNA OF FLORIDA orthography by Gabb and Fischer is unnecessary and contrary to the rules of nomenclature followed in this volume. Notwithstanding the fact that the real type is intermediate in form between the P. vcntricosns group and that of /'. Jcffersonius, the balance of characters is decidedly in favor of the latter, and, thus restricted, it forms a fairly natural and recognizable assembly which will contain, besides the type, such forms as P. erassicardo Conr., P. Jcffersonius Say, P. Madisonius Say, P. cdgceombeusis Conr., P. scptenarius Say, --all large species, with conspicuous ribbing, radially squamosc-striate surface, convex and nearly equilateral valves, and more or less developed cardinal laminae. The group is chiefly Miocene. In Pectcn Clintonius we have a species which appears to differ remarkably from such forms as Jeffersonius, and yet the most essential distinction is the absence of ribbing. If we were to imagine a specimen of P. Jcffersonius with the ribs flattened out, the distinction between it and P. Clintonius would be almost imperceptible. In recent Pectens the group is only represented by such forms as P. fuscopurpurens Conrad, which never attain a large size but resemble in their sculpture the young shell of P. Madisonius and its allies. They can hardly be accommodated in the group as here restricted. Pecten (Plagioctenium) deserti Conrad. Pec tcn dcserti Conr., Pac....


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Product Details
  • ISBN-13: 9781235954566
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 196
  • Spine Width: 11 mm
  • Width: 189 mm
  • ISBN-10: 1235954560
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 358 gr


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