156 



ODOBJENUS OBESUS PACIFIC WALRUS. 





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. Odobcenus olesus. 



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

 many important differential characters, and on these differ- 



