358 



VERTEBRATES I FISHES. 



The Genus Zygcena has the head flattened horizontally, 

 with the sides much extended laterally. The Hammer- 

 Fig. 241. Fig. 342. 



Hammer-head, Z. malleus. Val. Head of Hammer- 



head. 



head Shark, Z. malleus, Val., attains the length of twelve 

 feet, and is bold and ferocious. 



The Genus Pristis has a very long, depressed snout, 

 armed on each side with pointed spines, planted like teeth. 



Fig. 243. 



Saw-Fish, P. antiquorum, Lath. 



The Common Saw-Fish, P. antiquorum, Lath., attains 

 the length of fifteen feet. 



Fig. 244. 



Sting Ray, Trygon hastata, Storer. 



RAIID^E, RAY OR SKATE FAMILY. This Family com- 



