. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. 320 COMPARATIVE ZOOLOGY. scales, the others have bony plates combined with scales. 1. Ophidic/*, or Snakes, are characterized by the absence of visible limbs;164 by the great number of vertebrae, amounting to over four hundred in the great Serpents; by a corresponding number of ribs, but no sternum; and no true eyelids, the eyes being covered with a transparent. Fig. 298.—Adder, or Viper (Pelias berus). England. skin. The tongue differs from that of nearly
. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. 320 COMPARATIVE ZOOLOGY. scales, the others have bony plates combined with scales. 1. Ophidic/*, or Snakes, are characterized by the absence of visible limbs;164 by the great number of vertebrae, amounting to over four hundred in the great Serpents; by a corresponding number of ribs, but no sternum; and no true eyelids, the eyes being covered with a transparent. Fig. 298.—Adder, or Viper (Pelias berus). England. skin. The tongue differs from that of nearly all other Reptiles in being bifid and extensile. The mouth is very dilatable. The skin is frequently shed, and always by re- versing it. Snakes make their way on land or in water with equal facility. As a rule, the venomous Snakes, as Vipers and Rattle- snakes, are distinguished by a triangular head covered with small scales; a constriction behind the head; two or more fangs, and few teeth; small eyes, with vertical pupil; and short, thick tail. In the harmless Snakes, the head gradu- ally blends with the neck, and is covered with plates; the teeth are comparatively numerous in both jaws; the pu-. 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; Birge, E. A. (Edward Asahel), 1851-1950. New York : Harper & Bros.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1883
