THE GREAT GROUPS OR -ORDERS" 



T3 



The tortoises have shells over the hodv ; the croco- 

 diliaiis 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 

 leo^less. AVe know enouo-h now to bes^in to learn some- 





Fk;. 



27. — Tuatera. 



