Dr. J. E. Gray on Sea-hears. 269 



The genera of the family may be divided into tribes thus :— 



Section I. Palate produced hehind to a line even with the con- 

 dylesofthejaws. Grinders f.f. Sea-lions. 

 Iribe 1.-0tariina. 

 }. Otaria. East and west coast of South America, 

 teection II Palate only extended behind to a line even with the 

 middle part of the zygomatic arch. Sea-bears. 

 iribe2. Callorhinina. Grinders f.f Skull oblong; 

 tace broad, shorter than the orbit ; forehead arched. 



2. Callorhmus. North-west coast of America. 



Tribe 3. Arctocephalina. Grinders f . « ; face of the 

 skull shelving- in front; the fifth and sixth grinders 

 belimd the front of the zygomatic arch. 



3. Phocarctos. Grinders large, lobed, the six upper with 

 two notches on the hinder edge. South America. 



4. Arctocephalus. Grinders thick ; crown conical. Africa. 



5. Euotaria. Grinders large, subcylindrical, crown coni- 

 cal ; face broad. South America. 



6. Gypsophoca. Grinders moderate-sized, compressed, 

 with a small, more or less distinct lobe on the front 

 edge of the cingulum ; face narrow, compressed. Aus- 

 tralia. 



Tribe 4. Zalophina. Grinders f . f , large, thick, in a close 

 continuous series ; the fifth upper in front of the back 

 edge of the zygomatic arch. 



7. Zalophiis. Grinders large and thick, in a close uniform 

 series. South America. 



8. Neophoca. Grinders large, thick, all equal, in a con- 

 tinuous uniform series. Australia. 



Tribes. EuMETOPiiNA. Grinders f-.f, more or less far 

 apart ; the hinder upper behind the hinder edge of the 

 zygomatic arch, and separated from the other grinders 

 by a concave space. 



9. Enmetoptas. West coast of America. 



10. Arctophoca. West coast of South America. 



The skulls of the following species are not known : 



1. Arctocephalus falklandicus, Gray, Hamilton, not Peters. 



New Georgia. B.M. 



2. Arctocephalus 7itvosus, Gray {A. leonina.Ysn:, Murie, Proc 



Zool. Soc. 1869, p. 108 ! ! !). Cape of Good Hope. B.M. 



3. Arctocejyhalus Forsteri, Fischer {Phoca ursina, J.E. Forster) 



Cloudy Bay, New Zealand. (Ann. & Mag. Nat. Hist. 

 1868, i. p. 219.) Grinders f.f, conical. 

 Ann. & Mag. N. Hist. Ser. 4. Vol.'w, 19 



