SEALS. . 7 
* Muzzle large, truncated, simple; canines large ; grinders 
lobed, when old truncated. 'Trichechina. 
9. Hauicuarvus. Muzzle broad, rounded; cutting teeth £; 
grinders 2 conical, the two hinder of the upper and hinder 
one of the lower jaw double-rooted, rest simple; canimes 
moderate; whiskers crenulated; muffle hairy; palm and 
soles hairy; claws 5°5, elongate. 
10. Tricuecuus. Muzzle very broad, truncated, swollen and 
convex above ; muffle, palm and soles chaffy, callous, with 
the hair more or less worn off in the adult (hairy when 
young ?); cutting teeth ¢ m youth, 2 in adult; grinders 
4°4, truncated, all single-rooted ; canines of upper jaw very 
large, exserted. 
** Muzzle of the male with a dilatile appendage; cutting 
teeth 4; grinders with a large swollen root, and a small, 
compressed, simple, plaited crown ; muffle hairy. Cysto- 
phorina. 
muzzle of the skull broad, truncated im front; forehead con- 
vex; hinder palatine bone short, transverse ; hair flat, trun- 
cated, close-pressed ; whiskers round, rather waved, thick ; 
| 
: 11. Morunea. Nose transversely wrinkled above, exsertile ; 
front claws obsolete ; crown of grinders finely plaited. 
12. CystopHora. Nose of male with a large compressed hood 
extending to the back of the head; muzzle very broad, 
hairy; nostrils large ; muzzle of skull broad, narrowed on 
each side im front; forehead flat; palatine bone broad, 
square; hair elongate, cylindrical; whiskers flat, waved ; 
claws 5°5, distinct; crown of grinders strongly wrinkled. 
d. Ears with a subcylindrical distinct external conch ; toes of 
the hind-feet subequal, short, with long membranaceous 
flaps at the end; fore-feet fin-like ; palm and soles bald, 
longitudinally grooved ; nose simple, with a rather large 
: callous muffle above and between the nostrils ; cutting 
teeth &, upper often bifid ; grinders Arctocephalina. 
13. ARCTOCEPHALUS. Cutting teeth $, upper subequal; muz- 
zle rather tapering in front; whiskers cylindrical, thick, not 
waved ; palate of the skull rather narrower behind than in 
front, short, scarcely reaching the middle of the zygomatic 
| arch ; lower jaw narrow, rounded below, without any angle 
; behind. 
