REPTILIA 



145 



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. 



Venomous snakes of United 

 States named in order of virulence : 

 i. Coral snakes, Elaps, about sev- 

 enteen red bands bordered with yel- 

 low 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 ab- 

 dominal blood tubes, stupefaction 



FIG. 2730. HEAD OF 

 VIPER, showing typical 

 triangular shape of head 

 of venomous snake. 



FIG. 273 b. SIDE VIEW, 

 showing poison fangs ; also 

 tongue (forked, harmless) . 



FIG. 274. VIPER'S HEAD, 

 showing poison sac at 

 base of fangs. 



FIG. 275. SKULL, showing 

 teeth, fangs, and quadrate 

 bone to which lower jaw 

 is joined. See Fig. 284. 



