double-rooted, the rest simple ; canines moderate ; whiskers crenu- 

 lated; muffle hairy; palm and soles hairy; claws 5-5, elongate: 



12. Tricheciius. Muzzle very broad, truncated, swollen and convex 



above ; nmflle, palm, and soles chafFy, callous, with the hair more or 

 less worn oil" in the adult (hairy when young?) ; cutting-teeth a in 

 youth, I in adult ; grinders 4-4, truncated, all single-rooted ; canines 

 of upper jaw very large, exserted. 



*• Muzzle of the male icith a dilatile appemlage; cutting-teeth | ; gj-inders 

 with a large szvollen root and a small, compressed, simj)le, plaited 

 croion ; miiffle hairy. Cystophorina. 



13. MonuNGA. Nose transversely wi-inkled above, exsertile ; muzzle of 



the skidl broad, truncated in front ; forehead convex ; hinder palatine 

 bone short, transverse ; hair flat, truncated, close-pressed ; whiskers 

 round, rather waved, thick ; front claws obsolete ; crown of grinders 

 finely plaited. 



14. Cystophora. Nose of male vnih a large compressed hood extending 

 to the back of the head ; muzzle very broad, hauy ; nostrils large ; 

 muzzle of skull broad, narrowed on each side in front ; forehead flat ; 

 palatine bone broad, square ; hair elongate, cylindrical ; whiskers flatr- 

 waved ; claws 5-5, distinct ; cro^\Ti of grinders strongly wrinkled. 



d. Ears with a subcyliiidrical distinct external conch; toes of the hind 

 feet snhcqual, short, icith long membranaceous Jlaps at the end; fore 

 feet Jin-like ; palm and soles bald, longitudinally grooved ; nose simple, 

 ivith a rather large callous muffle above and betiveen the nostrils; 



cutting-teeth f, tipper often bifid; grinders ^. Arctocephalina. 



15. Callorhinus. Cutting-teeth subequal ; face of skuU short; fore- 

 head convex, regularly rounded from the end of the nasal bone to 

 the middle of the vertex ; nasal opening small ; palate rather concave, 

 contracted behind, short, nearly reachuig the middle of the zygomatic 

 arch ; lower jaw short, thick, flattened, expanded beneath just in 

 front of the condyle. ■ 



16. Akctocephalus. Cutting-teeth subequal ; face of skull elongate ; 

 forehead flattened, and nearly horizontal from the nasal bone to the 

 vertex ; nasal opening large, high ; palate rather narrower behind than 

 in front, rather concave, sliort, not reaching behind the middle of the 

 zygomatic arch ; lower jaw naiTow, with a crest-like ridge behind, 

 beneath, just in front of the condyle. 



17. Otaria. Muzzle broad, high in front ; forehead rather convex ; 

 occiput high ; cutting-teeth |, upper and outer one very large, like 

 canines; grinders of adult -with very large roots and small, com- 

 pressed, lobed crown ; palate-bone rather wider behind than in front, 

 long, extending nearly to the articulation of the jaws behind ; lower 

 jaw broad, dilated in front and behind at the angle ; upper jaw elon- 

 gate, and dilate with age. 



