The Cretaceous chimaeroids of North America. Bulletin of the AMNH ; v. 31, article 19.
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Date
1912
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New York : Published by order of the Trustees, American Museum of Natural History
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Abstract
""It is shown in this paper that: 1. The genera of Cretaceous chimaeroids which have been described from North America are reducible to three - Edaphodon, Leptomylus, Isotaenia. 2. Edaphodon is the most common form. The 12 species which have been referred to it are reducible to six. 3. of these six, the two named by Cope, Edaphodon smocki and E. tripartitus, are identifiable with the European forms E. agassizi and E. sedgwicki, respectively. 4. These two species survived to a later time (Danian) in America than in Europe (Senonian). The time relations between Europe and America at the close of the Cretaceous were similar to those of the present day; i.e., certain species still living in America which had but recently (in a geological sense) become extinct in Europe. 5. Leptomylus represents the advancing line with a tendancy to develop cutting, instead of crushing, dental plates. This genus, however, is too specialized to be considered ancestral to the modern forms. Their ancestor is probably a genus like Elasmodus or Elasmodectes. 6. There are three localities in America from which Cretaceous chimaeroids are at present known: New Jersey, Mississippi and Wyoming. The first has yielded 9 of the 11 American forms, the other two localities only one species each"--P. 225-226.
Description
p. 195-227, [2] leaves of plates : ill., map. ; 24 cm.
Includes bibliographical references (p. 226-227).
Includes bibliographical references (p. 226-227).
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