310 COMPARATIVE ZOOLOGY. 
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Fig. 290.—Lizard (Lacerta). 
throat and a crest on the back. Except some of the Mon- 
itors of the Old World, all the Lizards are terrestrial. 
3. Chelonians, or Tortoises and Turtles, approach the 
Amphibians in some respects, but are of anomalous struct- 
unre. The skeleton is external, so as to include not only 
Fie. 291.—Hawk'’s-bill Turtle (Hretmochelys imbricata). Tropical Atlautic. 
