6 PHOCID-E. 



ft Lower jaw strong, with an acute angle ; orbits moderate. 



4. Stenorhynchus.' Skiill aud muzzle elongate ; gTiiidei-s compressed, 



with three cylindrical elongated lobes, the centre one longest and 

 largest. 



5. MoNACHUS. Skull broad, depressed behind ; muzzle short, broad ; 



orbits large ; grinders small, conical, thick, with a small anterior and 

 posterior lobe; lower jaw broad, with a distinct posterior angle; 

 upper cutting-teeth transversely notched ; palate angularly notched 

 behind. 



b. Cutting-teeth f ; the first grinder in each jaw single-rooted, the rest 

 tico-rooted; muzzle bald, callous between and above the nostrils, and 

 divided by a central groove ; tvrist rather exserted ; fingers subequal ; 

 claws five, large. Phocina. 

 * Branches of lower jaxv diverging; Imuer edge of lower jaw rounded, 

 simple ; palate angularly arched behind ; angle of lower jaw blunt, 

 sloping behind. 

 G. Callocephalus. Muzzle rather naiTow ; whiskers waved ; toes gTa- 

 dually shorter ; web between the hind toes hairy ; hair subcylindiical ; 

 luider-fur thin. 



** Branches of lower jaic diverging; lo^cer edge ofloicerjaw dilated on 

 the inner side. 



7. Pagomys. Palate angularly notched behind; angle of lower jaw 



blunt, sloping behind. 



8. Pagophilus. Palate truncated behind; angle of lower jaw acute, 



erect behind, with a notch above the basal tubercle ; muzzle rather 



Eroduced ; -v^skers waved ; toes gi-adually sliorter ; web between 

 ind toes baldish ; liair dry, flat, close-pressed, without any imder- 

 fur. 



*** Branches of Imoerjaw arched on the side and wide apay-t ; lotcer edge 

 produced on the inner side behind the symphysis ; palate arched. 



9. Halicyon. Tubercle on inner edge of front part of lower jaw elon- 



gate, shai-p-edged ; teeth moderate ; angle of lower jaw simple, with 

 a distinct notch above it. 



10. Phoca. Tubercle on inner edge of front part of lower jaw bhmt, 

 ruooilose; teeth small; angle of lower jaw with a roimded lobe on 

 inner side above the basal tubercle ; muzzle broad, short ; forehead 

 convex ; whiskers smooth^ simple ; ear-hole large ; fingers unequal, 

 the third longest, second' "anS'Tourth long, the first and fifth shorter, 

 nearly equal. 



B. Grindei-s with single root (except the tivo hinder grinders of Hali- 

 chcerus). 



c. Ears xvithaut any co7ich; toes simjjle, of fore feet exseHed, of hind feet 

 large, the inner and outer ones large and long, the three middle ones 

 shorter ; palm and soles hairy, sometimes chaffy and callous from 

 ivear ; muffle hairy to the edge and betioeeti the nostrils. 



* Muzzle large, truncated, simple ; canines large ; grinders lobed, when 

 old truncated. Trichechina. 



11. Halichcebus. Muzzle broad, rounded ; cutting-teeth f ; grinders '—, 



conical, the two hinder of the upper and hinder one of the lower jaw 



