MUSEUM OF COMPARATIVE ZOOLOGY. T3 



metopias Stelleri. Captain Bryant writes me that he feels quite sure 

 two species of sea lions inhabit the coast of California and the other 

 Pacific States, but he has not yet had an opportunity of carefully ex- 

 amining them. The three specimens from the west coast of the United 

 States alreaily in collections, — that described by Dr. McBain, the one 

 in the Museum of the Smithsonian Institution, and that in the Museum 

 of the Chicago Academy, — sufficiently establish its occurrence on the 

 California coast. There seems to be nothing known, or at least on 

 record, concerning its habits. 



Subfamily II. — OULOPHOCTN^E. 



AVith thick under-fur ; size smaller, form slenderer, and the ears rela- 

 tively much longer than in Trichophocinat. Digital swimming flaps of the 

 hind feet very long. Molars § ~ § = \%.* 



Genus Callorhinus Gray. 



Callorhinus Gray, Proc. Lond. Zool. Soc, 1859, 359. Type " Arctocephalus 



ursinus Gray," = Phoca ursina Linne. 

 Arctocephalus Gill, Proc. Essex Inst., V, 7, 1866. Same type; not Arctoceph- 

 alus F. Cuvier. 



Facial portion of the skull broad and greatly produced. Otherwise essen- 

 tially the same as in Arctocephalus. 



Callorhinus and Arctocephalus are sufficiently distinguished from the 

 hair seals by the character of the pelage, as well as by the other char- 

 acters given above in the diagnoses of the two groups of hair and 

 fur seals. Callorhinus differs apparently from Arctocephalus mainly, 

 if not almost solely, in the greater prominence of the facial portion of 

 the skull. Between these two groups there are not such radical differ- 

 ences in the form of the skull as are met with in the several genera of 

 the hair seals, by means of which Otaria, Eumetopias, and Zalophus are 

 so trenchantly separated from each other. Callorhinus and Arctoceph- 

 alus, though closely allied forms, are probably generically separable. 



Callorhinus ursinus Gray. Northern Sea Bear. 

 Ursus mannus Steller, Nov. Comm. Academ. Petrop., 11,331, PI. XV, 1751. 

 Phoca ursina Linne, Syst. Nat., I, 37, 1758. (From Steller.) 

 "Phoca ursina Schreher, Saugeth., Ill, 289, 1758. (From Steller.)" 

 Phoca ursina Shaw, Gen. Zool., I, 265, PI. LXII, 1800. 

 Fischer, Synop. Mam., 231, 1829. 

 " " Pallas, Zoog. Posso-Asiat, I, 102, 1831. 



* For a more extended comparison of Oulophociiue with TrichophocincB, see above, 

 pp. 21-23. 



