208 MAMMALIA. 



FAMILY II. PHYSETERID.E. 



Head enormous, terminating in an abrupt, 

 square muzzle ; lower jaw narrow, pointed, armed 

 with stout conical teeth ; upper jaw destitute of 

 teeth and whalebone ; blow-hole single. 



Physeter (Linn.). Sperm-whale. The only genus ; 

 characters those of the family. 



P. macrocephalus. Fig. 329 ; -^ n. s. 

 tursio. 



328 



329 



FAMILY III. DELPHINID.E. 



Head of moderate size, often prolonged into a 

 beak ; both jaws commonly furnished with teeth, 

 which are numerous, and conical in form ; no whale- 

 bone plates ; blow-hole single, crescent-shaped. 



Monodon (Linn.). Narwhal. No teeth, except a 



