Nature Volume 73

Nature Volume 73

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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. 1906 edition. Excerpt: ...opening is observed in the form of a bony tube in three skulls, it is of course possible that it was not invariably present in the Sauropoda, and that in some forms the foramen was partially or completely roofed over. It will be recalled that the skull of Diplodocus has a long snout or antorbital extension supporting a series of slender, pencil-like teeth. The skull of Morosaurus differs widely from this type, first in the highly convex forehead or antorbital region, which is undoubtedly correlated with the presence of the great spoon-shaped cropping teeth, which were comparatively powerful and presented considerable resistance. Above, there are four premaxillary and eight maxillary teeth, decreasing in size as they extend toward the back of the jaw. From twelve to thirteen teeth are preserved in the mandible. The deep, massive proportions of the premaxillaries, maxillaries, and mandibular rami are also mechanically correlated with the insertion and powerful functions of these large teeth. It is evident, however, that as in Diplodocus the animal had no power of masticating its food, and that these anterior teeth served simply for prehensile purposes. The anterior narial or respiratory openings are very large, facing forward rather than more directly upward, as in Diplodocus, while the openings in front of the orbits are correspondingly reduced. As restored in this specimen, the orbits are of enormous size, but considerable restoration was necessary in the bone surrounding this region, so that the contours of the orbits cannot be certainly ascertained. In the superior aspect of the skull it is evident that the frontal and nasal bones were much longer than in Diplodocus. It is noteworthy that the occiput or back part of the skull more

Product details

  • Paperback | 824 pages
  • 189 x 246 x 41mm | 1,442g
  • United States
  • English
  • black & white illustrations
  • 1236969650
  • 9781236969651