Fossil Vertebrates in the American Museum of Natural History Volume 3

Fossil Vertebrates in the American Museum of Natural History Volume 3

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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. 1909 edition. Excerpt: ... in Neohipparion, and we may yet find species of this genus completely monodactyl, paralleling the direct line of descent of the modern horse, and more advanced in foot structure while more primitive in teeth. Rhinoceroses are not common in the Rosebud beds on Porcupine Creek. only two skulls having been found. They have been provisionally referred to Diceratlwrium, with which they appeared in the field to agree. If H115 reference is confirmed, and no intermediate forms turn up later, we may conclude, as Osborn has already suggested, that the Aplwlops-Teleocefllfi' group of Rhinoceroses were of Old World origin and not derived from the rhinoccroses of the American Oligocene. The Tapirs are indicated only by a single lower molar, which adds nothing to our knowledge of their development. The Oligocene genus Elotherium persists into the Lower Rosebud. I In the Upper Rosebud the true peccaries are represented by an intermediate stage between the Oligocene Perchzerus (Thinohyw) and the more specialized genera of the later Tertiary. The camels are represented by two or more species, apparently of ilw genus Miolabils, as seen in the field, and not far from M. transmxmill-1W? of the Mascall beds in Oregon. They have short-crowned teeth, "Pl?" incisors unieduced, and separate metapodials, and difier chiefly in size from the John Day camels. In the Middle Miocene of the Plains the camels have long-crowned teeth; some have separate, others united metapodials, and the upper incisors 1 and 2 are generally present though Often reduced in size. In the Upper Miocene the teeth are long-crowned, the upper incisors absent, the metapodials united. _ Oreodonts are very abundant in the Rosebud. Promerycochceril-8 15 very common in the lower...show more

Product details

  • Paperback | 180 pages
  • 189 x 246 x 10mm | 331g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236800419
  • 9781236800411