1872.] DR, J. E. GRAY ON SEA-BEARS. 65!) 



with the condyle. They have only six grinders in the upper jaw, 

 and the last is placed even with the hinder edge of the zygoma. 



2. The Sea-bears have the front angle of the hinder nasal opening 

 in the middle of the zygomatic arch. 



* Callorhinus, Phocarctos, and Gypsophoca have six grinders in the 

 upper jaw ; and the two hinder grinders are on a level with, or 

 behind, the hinder edge of the zygomatic arch. 



** Arctocephalus has six grinders in the upper jaw, and only the 

 hinder one is behind the hinder edge of the front part of the 

 zygomatic arch. 



*** Eumetopias has five grinders in the upper jaw; the fifth is far 

 away from the rest and behind the hinder edge of the front part 

 of the zygomatic arch, with a pit between the fourth and fifth 

 as if a tooth were absent ; but it is so in all the specimens I have 

 seen, and Mr. Allen figures it with this peculiarity. 



**** Zalophina and Neophoca have only five grinders in the upper 

 jaw, the fifth grinder being opposite the middle of the front end 

 of the broad zygomatic arch. 



Gypsophoca. 



Skull broad behind, at the part behind the ear-hole ; the palate 

 narrow, concave ; the internal nostrils rounded in front, and diverging 

 on the sides behind. Grinders g . |, the two hinder upper with two 

 roots, quite behind the hinder edge of the zygomatic arch ; the fifth 

 lower fitting between the fourth and fifth upper grinders ; the crown 

 of the grinders triangular, elongate, recurved ; the upper with a slight 

 denticle in front of the base, the two hinder smooth ; the lower ones 

 with a notch ou each side. 



Arctocephalus, *** Gypsophoca, Gray, Suppl. Cat. Seals and 

 Whales, p. 24. 



This genus is most like Arctophoca in the position of the teeth ; 

 but the palate is much narrower, the face short, and the hinder part 

 of the skull much larger and more ventricose. It differs from Arc- 

 tocephalus in the position of the upper grinders, the narrowness of 

 the palate, &c. 



Gypsophoca tropicalis. 



Black, grey beneath ; under-fur abundant, reddish brown. 



Arctocephalus niyrescens, b & c, Gerrard, Cat. Bones B.M. p. 147. 



Arctocephalus cinereus, Gray, Cat. Seals and Whales, p. 56 ; Ann. 

 & Mag. Nat. Hist. 1866, xviii. p. 236 (not synonyma) ; Hector, 

 Trans. New Zealand Instit. iv. t. xii. f. 2, p. 196. 



Otaria stelleri, Schlegel, Fauna Japoniea, tab. xxii. fitrs. 5 & 6 

 (skull) ? 



Hah. North coast of Australia (Mr. John Margillivray). 



