Geology, Physical and Historical Volume 2

Geology, Physical and Historical 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. 1916 edition. Excerpt: ...both in teeth and skeleton, to mammals. They are remarkable in possessing not only mammalian characters, but amphibian as well, i Fig. 499.--Skeleton of a mammal-like (theromorph) reptile, Endothiodon. (Courtesy, American Museum of Natural History, City of New York.) and occupy a position intermediate between mammals and amphib-ians. It seems probable that the Theromorpha include the pro-genitors of the mammals. (Broom, 1911.) One amphibian character is seen in the backbone, the bodies of the vertebrae of which are hollow at both ends (amphiceelous) and, in some cases, are only partly connected with bone. The teeth of certain genera (Cynognathus) are of three kinds as in mammals: incisors, canines, and molars. In some cases the limbs are decidedly mammal-like in structure. An-other group of theromorphs have toothless jaws (Figs. 499, 500), covered with horn like a turtle's (Oudenodon), and some possess, in addition, two long canine teeth (Dicynodon). It is possible that the former (Oudenodon) is the female of the latter. The theromorphs were all land animals, with limbs for the support of the body, but they varied greatly in appearance and habit. Fig. 500.--Skull of a theromorph with beak-like jaw (Oudenodon). The animal was herbivorous. The skull is one and a half feet long. Some (Pareiasaurus, Fig. 501 A, B) were as large as rather small cattle, about nine feet in length and standing about three and a half feet high, but with short legs and small, peg-like teeth, showing that they were herbivorous. They are believed to have been tortoise-like in habits, and probably protected themselves by digging in the ground. Associated with these in the same beds are carnivorous theromorphs (Fig. 502), some with skulls two feet in length, with long, more

Product details

  • Paperback | 104 pages
  • 189 x 246 x 6mm | 200g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236642910
  • 9781236642912