166 



ODOB^NUS OBESUS PACIFIC WALRUS. 



zygomata share tlie general character of the anterior half of the 

 skull. 



Fig. 28. Odoboenus rosmarus. Adult. 

 But equally striking differences are seen in a comparison of 

 the lower jaws of the two species. These differences correlate 



Fig. 29. Odohcvnus obesus. Adult. 



in a most interesting manner with those that characterize the 

 cranium. Thus, in the Atlantic species (Figs. 28 and 30), the 



