232 EUMETOPIAS STELLliRI STELLER's SEA LION. 



EumetopkiH difler.s Iroin Zalophus tbrougli the presence of a 

 wide si^ace between the fourth and fifth pairs of upper molars, 

 the less emargination of the posterior border of the palatine 

 boneSj the quadrate instead of the triangular and posteriorly 

 pointed form of the postorbital processes, the less relative 

 breadth of the posterior nares, and the larger size of the facial 

 angle; also through its much broader muzzle, the less degree 

 of the postorbital constriction of the skull, and its much less 

 developed sagittal crest. 



Eumetopias differs too widely from Callorhinus and Arctoce- 

 phalus, in dentition and cranial characters as well as in size and 

 pelage, to render comparison necessary. The genus is at once 

 distinguishable from all the others of the family by the wide 

 space between the fourth and fifth upper molars. In distribu- 

 tion it is restricted to the shores and islands of the Xorth Pa- 

 cific Ocean, ranging from Southern California northward to 

 Behring's Straits. Its geographical rei)resentative is the Otaria 

 jiibata of the Southern Seas, which ranges from the equatorial 

 regions (Galapagos Islands) southward. 



EUMETOPIAS STELLEEI, [Lesson) Peters. 



Steller's Sea Lion. 



Leo marinus, Steller, Nov. Comm. Petrop., xi, 1751, 360. 



Phoca jiibaia, Schreber, Siiugeth., iii, 1778, 300, pi. Ixxxiii B (in part only; 

 not P. juhata, Forster, witli wMcli, however, it is in part con- 

 founded). Gmelin, Syst. Nat., i, 1788, 63 (in part ; = P. jM&ato, 

 Schreber). Pander & D'Alton, Skelete der Eobben nud Laman- 

 tine, 1826, pi. iii, figs, d, e, /.Hamilton, Marine Ampbib., 1839, 232 

 (in part not tbe figure of the skull). 



Phoca (Otaria) juhnta, Eichardson, Zool. Beecbey's Voy., 1839, 6. 



Otaria juhata, Pepon, Voyage Terr. Austr., ii, 1816, 40. NiLSSON, Arch. f. 

 Naturgescb., 1841, 329 (in part only ; includes also tbe true Otaria ju- 

 hata). ? Veatch, J. R. Browne's Resources of tbe Pacific Slope, 

 [app.], 150 (probably only in part, if at all). 



Otaria stelleri, Lesson, Diet. Class. Hist. Nat., xiii, 1828, 420. J. MtJLLER, Ar- 

 cbiv f. Naturgescb., 1841, 330, 333. Schinz, Syuop. Mam., i, 1844, 

 473. Gray, Cat. Seals in Brit. Mus., 1850, 47 ; Cat. Seals and Whales 

 in Brit. Mus., 1866, 60. Sclater, Proc. Zool. Soc. Loud., 1868, 

 190. Scott, Mam. Recent and Extinct, 1873, 22. 



Phoca stelleri, Fischer, Synop. Mam., 1829, 231. 



leri rests anteriorly on tbe mastoid processes and tbe points of the canines, 

 the points of tbe pterygoid hamuli being several millimetres above tbe plane 

 of rest, while in 0. juhata the skull in the same jiosition rests posteriorly on 

 the pterygoid hamuli, which project 5" below a plane connecting the mas- 

 toid processes and the points of the canines. 



