140 



ANIMAL BIOLOGY 



between the toad or frog (Fig. 250) and the "horned 

 toad," which is a lizard (Fig. 265), 



FIG. 265. "HORNED TOAD" LIZARD, of the Southwest 

 (Phrynosoma cornita) . x . 



STUDY OF A TURTLE OR TORTOISE 



SUGGESTIONS. Because of the ease with which a tortoise or 

 turtle may be caught and their movements and habits studied, it is 

 suggested that one of these be studied as an example of reptiles. 

 Besides a live specimen, a skeleton of one species and the shells of 

 several species should be available. 



FIG. 266. EUROPEAN POND TURTLE (Emys lutaria). (After Brehms.) 



The body (of a turtle or tortoise) is divided distinctly into 

 regions (Fig. 266). Is there a head ? Neck ? Trunk ? 

 Tail ? The trunk is inclosed by the so-called shell, which 



