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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. 1921 edition. Excerpt: ...structureless substance covering the posterior surfaces of the incisor teeth, which some have supposed to be enamel, but which may be cementum. (e) The enamel is not divided into two layers. Among the marsupials the rodent-like dentition of the wombat has already been noticed. A similar modification occurs in one of the lemurs, cheiromys, a native of Madagascar. CHAPTER XXI THE TEETH OF MAMMALIA continued) CARNIVORA This order includes the flesh-eating mammals, or beasts of prey. They are divided into two groups: carnivora fissipedia (terrestrial carnivora) and carnivora pinnipedia (aquatic carnivora). In all the carnivora the teeth are adapted for a flesh diet. The full number of incisors are present. The canines are large, especially in the male animal; they are used in sexual combat. In the walrus, one of the aquatic carnivora, the female has canines as large as the male. These animals use their canines for hanging on to rocks. The molar series is reduced in number, and adapted for slicing rather than for grinding. The temporo-maxillary joint is a pure hinge joint, allowing no side-to-side movement. The temporal muscle is Very large, the zygomatic arch being specially wide, to allow the passage of the large muscle, while the external pterygoid is proportionately reduced in size. In herbivorous animals it has been noted that the incisors are usually reduced in number while the full molar series is present. These animals have large external pterygoid muscles, firmly attached to the interarticular fibrocartilage of the temporo-maxillary joint; and the shape of the articular surfaces of the glenoid cavity and the condyle of the mandible allows considerable side-to-side movement in the joint. CARNIVORA FISSEPEDIA--The different members more

Product details

  • Paperback
  • 189 x 246 x 3mm | 109g
  • United States
  • English
  • black & white illustrations
  • 1236776615
  • 9781236776617