69 



II. Molar teeth 5 t |, the posterior generally caducous in adult : canines of 

 upper jaw greatly hypertrophied and developed as tusks; those of lower 

 jaw atrophied: incisors, except external of upper jaw, deciduous. (Ros- 

 maroidt ".) 



A. Form comparatively etypical, with the hinder legs flexible forwards. 



Ear conchs obsolete. Skull with the mastoid processes strong and 



salient ; the surface continuous with the auditory bullae ; no postorbital 



processes ; distinct alispheuoid canals. Anterior limbs about as large 



as posterior; feet with the toes decreasing in a curved line, destitute of 



claws : posterior feet with the five digits scarcely increasing toward 



inner; all provided with claws. 



ROSMARIDAE. (XXVII.) 



SUPER-FAMILY PHOCOIDEA. 



XXV. OTARIIDAE. 



Genera. 



§• 1. 



Zalophus Gill. 



Zalophus sensu. strict. Neophoca Gray. 



§.2. 

 Eumetopias Gill. 

 Otaria Peron. 



Oiaria sensu strict. Phocarctos Peters, Gray. 



Arctocepkalus F. Cuv. =Halarctos Gill. 



Arctocejihalus Gray. 



Gypsophoca Gray. 



Arctophoca Peters=Euotaria Gray. 

 Callirhinus Gray. 



XXVI. PHOCIDAE. 



SUB-FAMILIES. 



I. Maxillar zygomatic process with the posterior surface subvertical or very 

 oblique. Malar oblong-rhomboid, emarginated above and below. 



A. IntermaxiUaries narrow, prolonged, and wedged behind between the 

 supramaxillaries and nasals. Nasal bones narrow, diminishing in 

 width backwards. Incisors f ; exceptionally ;!. 



PHOCINAE. (A.) 



B. IntermaxiUaries terminating far from nasals. Nasal bones narrow and 

 shortened. Incisors #. 



CYSTOPHOR.INAE. (B.) 



II. Maxillar zygomatic process with its lower and posterior surface extended 

 horizontally backwards, and its angle continued far behind along the inner 

 side of the malar. Malar elongated, bow-shaped, and curved upward in 

 front. 



A. IntermaxiUaries narrow, not continued backward between nasals and 

 supramaxillaries. Nasal cavity expanded, with the nasal bones w'dest 

 toward the middle and very long. Incisors ' 



J ° STENORHYNCHINAE. (C.) 



