232 Dr. J. E. Gray on the Skulls of Sea-Bears 
In the front part of the younger skull, which was received 
from Mr. Gould, the teeth are placed rather further back than in 
the adult skull from North Australia received from Capt. Grey, 
the hinder part of the fifth tooth being behind the back edge of 
the zygomatic arch. 
4. ArcropHoca, Peters. 
Dr. Peters described this subgenus from a specimen sent 
from Chili by Dr. Philippi. It chiefly differs from Zalophus in 
the palate being much narrower, but rather wider behind, and 
the teeth rather far apart. I have not seen any skull agreeing 
with these characters. 
Arctophoca Philippi, Peters, Monatsb. 1866, p. 276, 
t. 2. a, B, c (skull and teeth). 
Hab. Juan Fernandez. Dr. Philippi, Mus. Berlin. 
According to the figures, the form of the skull and the large 
size of the orbit are very similar to those of Phocarctos Hookert ; 
but the number and form of the teeth are different. 
B. The grinders 5/5, the third upper being under the front edge of the 
orbit, the last or fifth separated from the rest by a broad space and 
placed far behind the back edge of the zygomatic arch ; the hinder 
grinders two-rooted. 
5. Eumerorias, Gill, Peters. 
Arctocephalus § a***, Gray, Cat. Seals & Whales, p. 51. 
Palate flattish or rather concave in front, as wide in front as 
at the end of the tooth-line, and then slightly narrowed behind. 
Posterior nares oblong, elongate, broadly truncated in front, the 
front edge being behind the line of the orbital process of the 
zygomatic arch. The grinders have large oblong roots; the 
second, third, and fourth upper ones have a subcentral longitu- 
dinal groove on the outer side, and a less marked one on their 
inner surface; the inner side of all but the first of the lower 
ones are similarly grooved; the fifth upper grinder (or more 
properly the sixth in the normal series) has two distinct roots. 
The lower jaw much more elongate than that of Otaria jubata, the 
hinder angle more oblique, and the lower margin long andstraight. 
The skull of the young animal, which was sent by Mr. A. S. 
Taylor to Mr. Gurney from California, and which I first de- 
scribed, with doubt, as A. Monteriensis, junior (P. Z. S. 1859, 
p- 357), and which in the ‘ Catalogue of Seals and Whales’ I 
named Arctocephalus Californianus (see p. 51), agrees in every 
respect in its dentition with the large skull which we received 
from California, and which I described and figured as A. Mon- 
teriensis (P. Z. 8. 1859, p. 358, t. 72); but it differs greatly in 
