. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. VERTEBRATA. 309 ahvays by reversing it. Snakes make their way on land or in water with equal facility. As a rule, the venomous Snakes, as Vipers and Eattle- snakes, are distinguished by a triangular liead covered with small scales; a constriction behind the head; two or more fangs, and few teeth ; small eyes, with vertical pupil; and. Fig. 289.—a, Head of a harmless Suake (upper view); b, heads of various venom- ous Suakes. short, thick tail. In the harmless Snakes, the head grad- ually blends with the
. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. VERTEBRATA. 309 ahvays by reversing it. Snakes make their way on land or in water with equal facility. As a rule, the venomous Snakes, as Vipers and Eattle- snakes, are distinguished by a triangular liead covered with small scales; a constriction behind the head; two or more fangs, and few teeth ; small eyes, with vertical pupil; and. Fig. 289.—a, Head of a harmless Suake (upper view); b, heads of various venom- ous Suakes. short, thick tail. In the harmless Snakes, the head grad- ually blends with the neck, and is covered with plates; the teeth are comparatively numerous in both jaws; the pupil is round, and the tail tapering. This rule, however, has many exceptions. 2. Lizards may be likened to Snakes provided with four limbs, each having five ;' The body is cover- ed with horny scales. All have teeth, which are simple in structure; and the halves of the lower jaw are firmly united in front, while those of Snakes are loosely tied to- gether by ligaments. Nearly all have a breast-bone; and tlie eyes (save in the Gecko) are furnished with movable lids. In the common Lizards and Chameleon, the tongue is extensile. The tail is usually long, and naturally snaps off at the twelfth caudal. The Chameleon has a prehen- sile tail. The Iguana is distinguished by a dewlap on 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 Orton, James, 1830-1877. New York, Harper and brothers
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