156 



ODOB^NUS OBESUS PACIFIC WALRUS. 



DiFPERENTiAL CHARACTERS. As already stated, tlie Pa- 

 cific Walrus dijffers from the Atlantic Walrus very little in 

 external characters, except in facial outline and in the size and 



Fig. 14. Odohcemis oiesus. 



^'' set " or curvature of the tusks. The skulls, however, afford 

 many important differential characters, and on these differ- 



