. Elements of comparative zoology. Zoology. 344 SYSTEMATIC ZOOLOGY. The vertebrae are usually proccelous, and the vertebral column is divisible- into the regions of neck (ribless), thorax (with ribs), lumbar (ribless), sacrum (usually two vertebrae which connect with the pelvis), and tail; but in snakes these distinctions fail, and only trunk and tail ver- tebrae are recognizable. A breast-bone is present in. Fig. 142. -Brain of Snake, c, cerebrum; cl, cerebellum; o, optic lobes; I, olfactory nerve; II, optic nerve. lizards and alligators, but none occurs in turtles or snakes. The skull articu
. Elements of comparative zoology. Zoology. 344 SYSTEMATIC ZOOLOGY. The vertebrae are usually proccelous, and the vertebral column is divisible- into the regions of neck (ribless), thorax (with ribs), lumbar (ribless), sacrum (usually two vertebrae which connect with the pelvis), and tail; but in snakes these distinctions fail, and only trunk and tail ver- tebrae are recognizable. A breast-bone is present in. Fig. 142. -Brain of Snake, c, cerebrum; cl, cerebellum; o, optic lobes; I, olfactory nerve; II, optic nerve. lizards and alligators, but none occurs in turtles or snakes. The skull articulates with the vertebral centrum by a single surface (condyle). The hinder angle of the lower jaw is connected with the skull by the quadrate bone, which may be free (fig. 143), or firmly united to the skull; and the. 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 Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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