SEALS. 7 



* Muzzle large, truncated, simple j canines large ; grinders 

 lobed, when old truncated. Trichechina. 



9. HALICHCERUS. Muzzle broad, rounded; cutting teeth f; 



grinders ^, conical, the two hinder of the upper and hinder 

 one of the lower jaw double-rooted, rest simple; canines 

 moderate; whiskers crenulated; muffle hairy; palm and 

 soles hairy; claws 5'5, elongate. 



10. TRICHECHUS. 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 in youth, % 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 j grinders with a large swollen root, and a small, 

 compressed, simple, plaited crown j muffle hairy. Cysto- 

 phorina. 



11. MORUNGA. Nose transversely wrinkled above, exsertile ; 

 muzzle of the skull broad, truncated in front ; forehead con- 

 vex ; hinder palatine bone short, transverse ; hair flat, trun- 

 cated, close-pressed ; whiskers round, rather waved, thick ; 

 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 in 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 sub cylindrical 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 j grinders ||- Arctocephalina. 



13. ARCTOCEPHALUS. Cutting teeth f, 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. 



