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Collected Papers Volume 2

Collected Papers Volume 2


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: for the most part fragmentary and dissociated plates of Asterolepids. The records show that a small but characteristic assortaient of Russian Devonian fishes was received in exchange from the School of Mines at St. Petersburg many years ago. Some well-preserved Ptyctodont dental plates from the Upper Devonian of Iowa (State quarry beds) are also contained in the collection. The Ptyctodont type of dentition agrees so closely with that of modem Chimaeroids that the opinion has been generally held, until recently at least, the forms of Devonian fishes possessing these characteristic dental plates must have been similar in their organization to modern Holocephali, and should be provisionally included in the same subclass. The view as to the relationships of Ptyctodontidae which has commonly prevailed up until about the year 1906 is well stated by Dean in his monograph on Chimaeroids, published by the Carnegie Institution of Washington.1 The passage reads: The main virtue in the study of Ptyctodontids is to the writer this, that they present some evidence (1) that Chimaeroids are of Devonian stock; (2) that at this early period their dental plates were still but four in number, representing the dental structure of the jaw-halves of sharks; and (3) that the tritors existed as small points forming together a texture in the dental plates which is well known among early sharks. In the same year (July, 1906) a totally different conception of Ptyctodont relationships was advanced by Dr. Otto Jaekel, of Greifswald, who declared his belief that Ptyctodonts belong to the Chondrostean division of ganoid fishes, and that sturgeons themselves are related to Placoderms (i. e., Arthrodires plus Asterolepids). The reasons for advocating this novel view are not stated by the author, exc...


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Product Details
  • ISBN-13: 9780217460002
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 64
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 0217460003
  • Publisher Date: 08 Jul 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 132 gr


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