THE GREAT GROUPS OR "ORDERS 



Y3 



The tortoises liave shells over the hody ; the croco- 

 (liliaiis have plates placed edge to edge ; the lizards 

 and serpents have overlapping scales ; and on the 



.^- 



Fig. 36.— Crocodiles. 



tuatera the skin is warty. The serpents are practically 

 legless. AYe know enongh now to l)egin to learn some- 



FiG. 37.— Tuatera. 



