1(5. AKCTOCEPIIALUS. 49 



sections, separating A. Hookeri from the other species ; but I hud 

 only young or half-grown specimens of the skulls of this species ; 

 and since I have obtained the young skull from California, I am 

 induced to believe the slight convexity of the forehead and the slen- 

 derness of the lower jaw to be dependent on the age of the specimen, 

 and that most probably the forehead of the adult animal becomes 

 flatter and the lower jaw stronger as the animal increases in age. 



The species of this genus are scattered over the world. 



A. Monterknsis, A. Calif or ti'mnus, and A. Gilliespii are from Cali- 

 fornia. 



A. Hool-erl, A. nvjresce^is, and A. FcdMandkus from the Falkland 

 Islands and Cape Horn. 



A. Delalandii from the Cape of Good Hope. 



A. lohatus, A. cinereiis, and A. australis from Australia. 



a. Skull shwt and broad. 

 * Hinder edffe of the palate transversely truncated. jtl/ly^^^ 



1 . Arctocephalus Monteriensis. ^ '' 



Skull broad ; face short ; palate rather concave in front, nearly -fa/ ^ ■ ^'Q. 

 flat behind, the hinder aperture somewhat contracted, with a 

 nearly straight trans vei*se hinder edge. Teeth large ; the lower jaw ...^ .. /^ 

 elongate. ^ .Q '' ^ 



Arctocephalus Monteriensis, Gray, Proc. Zool. Sac. 1859, 357. t. 72 i . 



(skidl), p. ?,()0. ' 



Inhab. California (ilonterey). Called Lobo marina by the Spaniards. 



a. •' Skull and tongue bones of the Californian Sea Lion (Spanish ^^ /f , V, 



Lobo niarino), taken near Monterey ; A. S. Taylor, July 1S58." ~T ~~' 



Presented by J. H. Gumey, Esq., M.P. 



This skuU is as large as, and very like in external ajipearauce to, ^ 



the skull of the adult Otaria leonina, or Southern Sea Bear of the xQjc 4 



southern part of the west coast of America, which we have in tlye 

 British Museum from the coast of Chili. 



The skulls of the Lobo marino and Otaria leonina are easily dis- 

 tinguished, and, when they are more closely examined, prove to 

 belong to two different genera. The Californian skull has the short 

 flat palate, contracted behind, of the genus Arrtocephalu.><, and the 

 other the very long deeply concave palate, nearly as Avide liehind as in 

 front, of the genus Otaria. It also has the high nose, with a nearly 

 horizontal facial line over the nose, of the former genus, instead of 

 the low nose shch-ing towards the edge of the upper jaw of the Otaria 

 or Sea Lion of Chili. 



The adidt skull is more than double the size of the adult skulls of 

 the other species of Arctocep/iali which we have in the Museum Col- 

 lection, and shows the existence of a Seal of very large size in these 

 seas — as large as the Sea Lion of Chili. 



The skull has been conii)arcd with the skulls oi Arctocephalus De- 

 lalandii, from the Cape, figured in Proc. Zool. Soc. 1858, t. <i9; 



