154 ODOILENVS OBESUS PACIFIC WALRUS. 



states that the animals have the power of rolling them about in 

 every direction, so that when aroused they seldom move the 

 head more than to elevate it, the position of the eyes near the 

 top of the head giving them the needed range of vision. 



The nostrils, as in the Atlantic species, are at the top of the 

 muzzle ; they are " oval, and about an inch in their greatest 

 diameter." The auricular opening is placed nearly in a line with 

 the nostrils and eye, and hence near the top of the head in a 

 fold of the skin. The animal is said to have a keen sense of 

 smell and an acute perception of sound, but a limited power of 

 vision. * 



An idea of the uncouth and peculiar facial aspect of the Pa- 

 cific Walrus may be derived from the above-given figures (Fig. 

 13) drawn by Mr. Elliott, to whose kindness I am indebted for 

 their presentation in the present connection. 



I append herewith measurements of a considerable series of 

 skulls, of different ages, one only of which is marked as that of a 

 female, they being mostly skulls of middle-aged or very old 

 males. 



*See Elliott, 1. c., pp. 161, 162. 



