22 ELEMENTS OF COMPARATIVE ZOOLOGY. 



mallet, the eyes being on the outer ends of the lobes. In 

 the sawfishes the snout is drawn out in a long beak, either 

 edge of which is armed with sharp teeth. 



FIG. 1. Sawfish 

 (Pristis pecti- 

 natus). After 

 Goode. 



FIG. 2. Common Skate (Raia erincea). 



ORDER II. RAIJE (Skates, Rays). 



In the skates and rays the body is usually flattened, and 

 the gill-slits are on the under surface. In most forms the 

 body is sharply marked off from the tail, but in those saw- 

 fishes which belong to this order the body is shark-like. 

 The width of body in the true skates is partly due to 



