MUSEUM OF COMPARATIVE ZOOLOGY. 63 



Stelleri auct.) in the genus Arctocephalus, and the southern sea lion in 

 Otaria, with which he nominally associated the 0. Stelleri. He failed, 

 however, to recognize the identity of his A. monteriensis with the 0. 

 Stelleri, and hence the entire generic diversity of the northern and 

 southern sea lions seems to have escaped his observation. The latter 

 fact was first pointed out by Dr. Gill in his " Prodrome," as above 

 stated. 



Comparison with Otaria jubata. — Having only male specimens of 

 the Eumetopias Stelleri, and only skulls of the female of Otaria jubata, 

 I am unable to make a detailed comparison of these two strictly geo- 

 graphically representative species. The following measurements of a 

 female 0. jubata, taken from the animal itself (at Cabo Corrientes, 

 Buenos Ayres), by Dr. G. A. Maack, are here introduced for future 

 reference, since they are more detailed than any hitherto published : — 



" Measurements of Otaria jubata (adult). 



" Total length to end of tail 1,750 mm. 



" " « " " outstretched hind limbs . . 2,070 " 



Greatest circumference of the body .... 1,050 " 



Circumference of the body in front of fore limbs . 970 " 



" " " hind limbs . . 860 " 



" of the neck 620 " 



Length of left fore fin 700 " 



" « palm 500 " 



" " hind fin (sole) 430 " 



" The general color is brown ; iris, coffee-brown ; barbules, dark yellow." 



Of the large collection of skins and skeletons of the Otaria jubata 

 received by the London Zoological Society in 1868, we as yet have no 

 very detailed account. The measurements of one of the adult females 

 given by Dr. Murie * are as follows : " Greatest length of skin, includ- 

 ing hind extremities, 80 1 inches [2,045 mm.] ; from muzzle to end of 

 tail, 66| inches [1,702 mm.]; tip to tip of fore limbs outspread, 58 

 inches [1,473 mm.]" It hence agrees very nearly in size with that 

 measured by Dr. Maack. 



The measurements of a male specimen of O. jubata — belonging to 

 the same collection as the female — given by Dr. Murie, indicate 

 that it was not nearly full grown. The few reliable facts we have in 



* Proc. Zool. Soc. 1869, p. 102. 



