49 Bulletin American Museum of Natural History. [Vol. XVI, 



pm 2 and pm 3 , but the amount of obliquity is rather less in the female, 

 and in one specimen (No. 38014) all of the lower premolars stand parallel 

 to the axis of the toothrow. 



Measurements (type skull). Basal length, 

 248 mm.; greatest zyogmatic breadth, 150; 

 mastoid breadth, 139; front border of pre- 

 maxillae to pterygoid hamuli, 134; front bor- 

 Phoca stejnexeri, very der of upper incisors to posterior border of 



Fig. 

 young 

 21311, 



molars ; the right lower molar in 

 this specimen has four cusps, the 

 left only three. Nat. size. 



toca stejnegen^ very 



Bering Isbn^Lower u PP er molar . 8o \ fr nt bor der of premaxilte to 

 - meatus auditorius, 235; palatal length (along 

 median line), 103; palato-maxillary suture to 

 pterygoid hamuli, 49 ; palato-maxillary suture 

 to anterior border of foramen magnum, 148; palatal width between 

 the molars, 50; length of upper toothrow, 52; length of nasals, 61; 

 breadth of nasals at fronto-maxillary suture, 15; least interorbital 

 breadth, 17; length of brain case, 91; greatest width of brain case, 

 100; length of upper jaw, 158; length of lower toothrow, 50. 



Five additional skulls are available for measurement as regards the 

 principal dimensions which, with the corresponding measurements of the 

 type, may be tabulated as follows: 



The skulls of Nos. 38011 and 38012 have not been cleaned, and the 

 teeth have suffered much injury from long immersion (with the skins) in 

 a preservative solution, but it is evident that both specimens are merely 

 4 young adults ' which had not attained their full size. 



Phoca stejnegeri is a member of the P. vitulina group, from 

 other forms of which it differs by its much larger size (see 

 fig. 10, p. 494, for relative size of bullse), and in certain well- 

 marked characters of the skull and teeth, as already detailed. 

 It is doubtless as variable in coloration as is Phoca richardii 

 and P. vitulina 3 , at least in some of its phases. 



l Type. 



8 On the color variations of Phoca vitulina cf. Allen, Hist. N. Am. Pinnipeds, 1880, 

 pp. 562-564. 



