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



shown especially in the more shallow hollowing of their an- 

 terior portion. Their shortness is due to the shortness of the 

 premaxillary portion of the palate, which is one-fifth shorter 

 than in P. hispida. In view of these differences the Okhotsk 

 Sea form seems well entitled to subspecific recognition. 



6. Phoca ochotensis Pallas. 

 OKHOTSK SEAL. 

 Figs. 5-6. 



Phoca ochotensis PALLAS, Zoog. Rosso- Asiat. 1,1811,117 (Okhotsk Sea). 



Type of present description, No. 18169, 9 ad., mouth of Gichiga 

 River, Okhotsk Sea, Aug. 17, 1901; N. G. Buxton, Jesup North Pacific 

 Expedition. 



General color above yellowish olive-brown, profusely marked with 

 small, irregular, dark brown and blackish spots, most numerous and 

 largest over the median area; below yellowish or ochraceous brown, with 

 fewer and more sharply defined spots of black. Tail dark above and 

 much spotted, lighter and unspotted on the sides and below. Upper sur- 

 face of feet heavily spotted, the lower surface without spots. Whiskers 

 white, crenulate for the basal third, the apical portion straight and 

 smooth; longest whiskers 75-90 mm. in length. Nails dark brown or 

 blackish, long and narrow. The digits of the manus recede in length 

 from the ist to the 5th, the front border of the manus being much less 

 square than in Phoca vitulina and P. stejnegeri. There seems to be no 

 sexual difference in color and very little in size. 



Measurements. Total length, 1470 mm. ; tail, 130; hind foot, 265. 

 Two other males and a female range in total length from 1340 (female) 

 to 1470 (male) mm. 



Skull. The skull is long and narrow in proportion to its breadth, 

 with the rostral portion greatly attenuated in comparison with any of its 

 allies, perhaps most resembling in general outline that of Phoca grcen- 

 landica. The audital bullae are very large and greatly inflated, the 

 portion forming the meatus auditorius much produced and sharply con- 

 stricted from the bulla, as in Phoca grcenland-ica. The premaxillae are in 

 contact with the nasals for a short distance, and the frontals extend 

 further forward along the nasals then in P. vitulina. The dentition 

 differs strikingly from that of any of the allied species, the teeth being 

 intermediate in stoutness between those of P. grcenlandica and P. vitu- 

 lina, stand in a straight line, and are separated by well-marked diastema. 

 The upper premolar-molar series are all bicuspid; there is a high main 

 cusp, with the point curved backward, and a small accessory cusp behind 

 it; in front of the main cusp the cingulum is strongly beaded, with, in 

 some specimens, an incipient cusp. There is a similar tendency to the 



