. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. 68 COMPARATIVE ZOOLOGY. be classed into incisors, canines, premolars, and molars. For such a dental series exhibits a double purpose, pre- hension and mastication. The chisel - shaped front teeth are fitted for cutting the food, and hence called incisors. These vary in number: the Lion has six in each jaw; the Squirrel has two in each jaw, but remarkably developed; the Ox has none in the upper jaw, and the Elephant none in the lower; while the Sloth has none at all.'" The ca-. FiG. 32.—Skull of the
. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. 68 COMPARATIVE ZOOLOGY. be classed into incisors, canines, premolars, and molars. For such a dental series exhibits a double purpose, pre- hension and mastication. The chisel - shaped front teeth are fitted for cutting the food, and hence called incisors. These vary in number: the Lion has six in each jaw; the Squirrel has two in each jaw, but remarkably developed; the Ox has none in the upper jaw, and the Elephant none in the lower; while the Sloth has none at all.'" The ca-. FiG. 32.—Skull of the Babirusn, or Malayan Hog, showing growth ;incl curvature of the canines. nines, so called bec^ause so prominent in the Dog, are conical, and, except in Man, longer than the other teeth. They are designed for seizing and tearing; and the}' are the most formidable weapons of the wild carnivores. There are never more than four. Thej' are wanting in all Rodents, and in nearly all herbivorous quadrupeds. The molars, or grinders, vary greatly in shape, but close-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Orton, James, 1830-1877. New York, Harper and brothers
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