118 



VERTEBRATA. MAMMALIA. 



enormous develop ement of the upper canines, and the 

 consequent enlargement of the head. These are 

 produced into tusks projecting downwards two feet 

 in length, slightly curved, and diverging at the points. 

 Their ivory is now generally considered superior to 

 that of the elephant. In form, the Walrus (called 

 also Morse, and Sea-horse) resembles the Seals, but 

 is more bulky in its proportions ; its habits are like- 

 wise similar, save that it appears to be herbivorous. 

 It usually exceeds an ox in size, and sometimes at- 

 tains to that of the elephant. It seems to be confined 

 in its geographical range to the frozen seas of the 

 northern hemisphere. 





