cording to Lyddeker, can trot cheerfully along with three full-grown men on its back. "Tortoise shell" used for combs and other articles is obtained from the overlapping scales of the hawkbill turtle, common in the West Indies. The diamond-back terrapin, found along the Atlantic Coast from Massachusetts to Texas, is prized for making soup.
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Fig. 272.—A Rattlesnake.
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Fig. 273 a.—Head of Viper, showing typical triangular shape of head of venomous snake.
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Fig. 273 b.—Side View, showing poison fangs; also tongue (forked, harmless).
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Fig. 274.—Viper's Head, showing poison sac at base of fangs.
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Fig. 275.—Skull, showing teeth, fangs, and quadrate bone to which lower jaw is joined. See Fig. 284 .
Poisonous snakes of United States named in order of virulence: 1. Coral snakes, Elaps, about seventeen red bands bordered with yellow and black (colored figure 6) (fatal). 2. Rattlesnakes (seldom fatal). 3. Copperhead (may kill a small animal size of dog). 4. Water moccasin (never fatal). 5. Ground rattler.—Effects: Pulse fast, breathing slow, blood tubes dilated, blood becomes stored in abdominal blood tubes, stupefaction
