VERTEBRATA : MAMMALIA. 



FIG. 97. 



All the Common Seals belong to a family named the 

 Phocidse. They are comparatively long and slender, and 

 have the external ears obsolescent, the anterior legs smaller 

 than the posterior, and the anterior and posterior feet pro- 

 vided with claws. The Phocidse include some genera in 



which the incisors are 

 ? ; others in which 



4 7 



they are \ ; and others 

 in which they are -. 

 The canines are nor- 



Common Seal, Phoca mtulina, Liuu. lllilllj developed, Elld 



the molars are generally ^. The seals of this family are 

 from three to twenty feet in length, and are remarkable 

 for the beautiful and intelligent expression of their eyes, 

 and also for their docility when in a state of captivity. 

 The Walrus of the Arctic Seas is the only living repre- 



FIG. 98. 



Walrus, Rosmarus obesus, Gill. 



sentative of the family Rosmaridae. It is seal-like in its 

 general appearance, but is especially remarkable on account 

 of its enormously developed upper canine teeth, which ex- 

 tend downwards in the form of large tusks. Its body is 

 very large, equaling in size that of the largest ox, and is 

 covered with short brown hair. 



