156 



ODOB^ENUS OBESUS PACIFIC WALEUS. 



DIFFERENTIAL CHARACTERS. As already stated, the Pa- 

 cific Walrus differs from the Atlantic Walrus very little in 

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



FIG. 14. Odobazniis obesus. 



* l set " or curvature of the tusks. The skulls, however, afford 

 many important differential characters, and on these differ- 



