1865. ] DR. J. E. GRAY ON THE MUSTELIDZ. 135 
Pteronura, Gray, Loudon’s Mag. Nat. Hist. 1837, p. 586; Cat. 
Mamm. B. M. xxi. 
Pteronurus, Lesson. 
Pterura, Wiegm.; Schinz, Syn. Mamm. i. 356. 
PTERONURA SANBACHII. 
Fur soft, liver-coloured brown; orbits paler; lips, chin, and 
throat yellow, the latter brown-spotted ; length of head 64, body 10, 
tail 12 inches; width of head from ear to ear 43; diameter of the 
fore foot 33; hind feet 4 inches long and 3 wide. 
Pteronura sanbachii, Gray, Loudon’s Mag. Nat. Hist. 1837.4, FOC tiem WN rf 
Péerura sanbachii, Wiegm. Arch. iv, t. 10; Schinz, Syn. Mamm . Bp 
< LEY 
aS 392 SLOI9 Cor 
Hab. Demerara (Edmonston, Mus. Roy. Inst. Liverpool). 
See also Lutra solitaria, Natterer, Schinz, Syn. Mamm. 256 
(‘Chestnut brown, beneath dirty white; tail conical, graduate, at- 
tenuate, slightly fringed each side ;’’ length of body and head 2 feet 
1 inch, tail 1 foot 3 inches), which may be the same as the former. 
Hab. Brazil, Ypanema. 
Tribe 3. ENuyprina. Head depressed. Hind feet large, elon- 
gate, rather fin-like, hairy above and below, oblique, truncated ; 
the outer toes largest; claws small. Tail short, cylindrical. 
Grinders massive, flat-topped. Flesh-tooth oblong, triangular, 
transverse; inner side narrow, tubercular: grinders similar, 
larger, outer edge narrow. Marine. 
17. ENuyprIs. 
Tail short, cylindrical. Muzzle bald, oblong, triangular. Soles 
entirely hairy, like the upper surface of the feet; claws acute, 
small. Skull much dilated behind, and swollen. Teeth 34; pre- 
molars 3/3, 3/3 ; grinders very large, massive, flat-topped. 
Enhydra, Fleming, Phil. Zool.; Gray, Cat. Mamm. B. M. xxi. 
72; Baird, Mamm. N. A. 189. 
Enhydris, Fischer, Syn. Mamm. 228. 
Pusa, Aken. 
Latax, Gloger (not Gray). 
Professor Lichtenstein’s figure of the animal, in the Darst. Saugeth. : 
t. 49, represents the hind feet as too small and too much like those 
of a common Otter. The hind foot is like a compressed fin, quite 
as much, and even more so than the case of the Seal. It differs 
from the foot of the Seal in the toes gradually increasing in length 
from the inner to the outer one, making the foot appear obliquely 
truncated. In the Seals, the inner and outer toes are the longest, 
and the middle ones are the shortest. In some respects the foot 
of the Sea-Otter resembles that of the Beaver; but it differs in the 
toes, as well as in being entirely covered, both above and below, with : 
short, close, silky hairs. The front claws are small, short, and very 
