MAMMALIA. 
81 
lections are quite insufficient for tlie determination of tlie species, 
and consequently for a satisfactory systematic arrangement, and 
that no real advance in our knowledge can be made unless com- 
plete series of the various seals inhabiting a certain locality are ob- 
i tained. He admitted at first, like his predecessors, the number 
of molar teeth as a character of his generic divisions ; but subse- 
i quently (p. 669) it was found to be much subject to variation, 
i and entirely useless even for specific definition. 
r Finally, Dr. Gray, induced by Mr. GilFs and Prof. Peters^a 
/ publications, reexamined the skulls and skeletons of the OtaricR 
I in the British Museum. He says that the Otariadm must be 
j considered a distinct family from the Earless Seals,^^ and divides 
I them thus (Ann. & Mag. Nat. Hist, xviii. September, pp. 228- 
• 237) 
■ I. The palate produced behind to a line with the condyles ; it is deeply 
; concave behind, and becomes deeper as the animal increases in age. The 
hinder nostril is short, with a truncated front edge. 
1. Otaria, with O.juhata (Forst.) ; the author is not inclined to I’egard 
; O. hjronia and O. godcffroyi (misprinted GeofFroyia”) as distinct. 
’i IT. The palate rather produced behind. The front edge of the hinder 
- nasal opening in a line with the middle of the zygomatic arch. 
A. The grinders the fourth upper (in adult) under the front edge 
I of the orbit, and the last in front of the back edge of the zygomatic arch, 
' Zalophina. 
2. Zalophus (Gill). Palate concave, narrow in front, wider at the line 
of the last grinder, and then contracted behind. The hinder nares narrow, 
elongate, twice as long as wide, acutely arched in front, front edge in a line 
with the front edge of the orbital process of the malar bone. With Z. gil- 
liespii. 
3. Neop)hoca (Gray). Palate concave, broad, as broad before as at the 
hinder part of the tooth-line, then rather suddenly contracted. The hinder 
nares broad, rather longer than broad, with the front edge broadly arched, 
which is further back than the front edge of the orbital process of the zygo- 
5 matic arch or malar bone, which is thick and flat. With N, lohata. 
4. Arctophoca (Ptrs.), with Otaria pliilippii (Viva.), 
B, The grinders 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. 
6. Eumetopias (Gill). 
0. The grinders the third upper under the front edge of the orbit, 
the fifth and sixth behind the back edge of the zygomatic arch j the upper 
hinder grinders two-rooted. 
C. Phocarctos (Ptrs.). 7. Callorhinus (Gray). 
D. Grinders the third upper grinder under the front edge of the 
\ orbit ; the hinder ones far back behind the back edge of the zygoma, Arctoce^ 
\ phalina, 
8. Arctocephalus (F, Cuv., Viva.) Halarctos (Gill). 
