The book Elementary Text book of Zoology volume 2 was written by author Carl Friedrich Wilhelm Claus Here you can read free online of Elementary Text book of Zoology volume 2 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Elementary Text book of Zoology volume 2 a good or bad book?
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I), but also on the soft palate, and is far more highly developed than in any other class of animals. Dentition. At the entrance to the digestive organs the jaws are almost always armed with teeth. Only individual genera as Echidna, Manis, and Myrmecophaga are entirely without teeth, while the whalebone Whales, which bear on the inner surface of the palate vertical horny plates (whale-bone), arranged in transverse rows (fig. 673), possess teeth, at least in the foetal condition. Horny teeth, pr...oduced by hardening of papillae of the buccal mucous mem- brane, are present in Ornithorhynchus and Rhytina. The dentition of the Mammalia is never so much developed as that of Fishes and Eep tiles ; and the teeth, which are wedged into alveoli, 286 MAMMALIA. Are confined to the maxillae, prsemaxillse, and mandible. The external part of the tooth (i. E. , the part which projects from the gum, and is called the crown, as opposed to the root) is covered with the harder enamel, which consists of prisms arranged at right angles to the cavity of the tooth (pulp cavity).
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