Fossil Vertebrates in the American Museum of Natural History Volume 2

Fossil Vertebrates in the American Museum of Natural History Volume 2

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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. 1903 edition. Excerpt: ...metacarpal, such as has been de-scribed as occurring with teeth of llfylagaulus, could very ap-: l propriately bear it. This claw phalange is long, compressed, the proximal facet very little keeled, the distal end slightly fissured but not symmetrically so, and shows no hood at the base. The hind foot when set in position on wax shows an unmistakable twist, the external side being bent down distally as if the animal walked on the outside edge of the foot, turning the claws inward underneath. This may serve to explain the short, stout fifth digit, as contrasted with the long, slender second; a proportion seen also in the armadillo and some other modern Edentates. REVISION OF Tl-IE SPECIES. On comparing the two skulls and three other more fragmentary specimens from Colorado with five specimens of M ylagauli from Nebraska in the Cope Collection, it appears that a considerable number of species are represented. On reviewing the description of Mesogaulus ballensis Riggs I find that I was in error in identifying it with llfylagaulus monodon, but its position can hardly be determined until more is known of the milk dentition and the history of the changes in tooth pattern in this curious family. As far as at present determinable the characters of the known species are: Mylagaulus monodon Cope. Type, a jaw with the enlarged molar and two alveoli posterior to it, from the Loup Fork of the Republican River Valley. A second specimen, a lower tooth from the same locality, referred to it by Professor Cope, is considerably larger. Enamel lakes in four rows. There are seven lakes in the type; nine in the associated specimen, No cement outside external enamel ring. Extreme anteroposterior diam. of molar? 1 1. 5 mm. 13. 5 mm. transverse " " " 6....show more

Product details

  • Paperback | 250 pages
  • 189 x 246 x 13mm | 454g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236510550
  • 9781236510556