198 SPECIMENS OF PINNIPEDIA. 



6. Brain of young female Elephant Seal, No. 5, from 

 Christmas Harbour. Membranes removed. Its dimen- 

 sions and anatomical characters are described by- 

 Turner in Cltallenger Report, Ixviii., 1888, plates 

 viii., ix. Figures on page 197. 



Subfamily OGMORHINlNiE. 



Anterior nares in front of infra-orbital foramina, which 

 open into floor of orbit ; beak moderately prolonged 

 in front of nares. Inner wall of orbit defective. 

 Pterygoids almost horizontal, separated from base of 



2 2 



skull by a slit or foramen. Dentition : in. ^ - , 



11 5 5 



c. , p.c. - -=32; post-canines two-rooted, except 



the first. First and fifth toes of pes longer than the 

 others. 



I. OGMORHINUS. (Og.) 



Ogmorhinus, Peters, Monatsh. d. k. preuss. Akad. d. Wiss., 



Berlin, 1875. 

 Stenorhinque, F. Cuvier, Mem. du Museum, xi., 1824. 



Premaxillas not quite reaching the nasals; cranial 

 breadth may or may not be wider than inter- 

 zygoinatic ; anterior nares oblique ; inter-orbital 

 part of frontal constricted behind, expanded 

 anteriorly; hard palate scooped out at posterior 

 border, vomer distinct in mid-palatal cleft; basi- 

 occipital not perforated ; par-occipital process present. 

 Wall of auditory meatus short ; groove between 

 tympanic and mastoid temporal. The name Steno- 

 rhynchus was originally given to this genus, but as 

 it had been previously applied to a Crustacean, 

 Ogmorhinus has been substituted. 



(1) Ogmorhinus leptonyx. (Og. l.) 



(Leopard Seal, Southern Ocean.) 



Phoca leptonyx, De Blainville, Journ. de Phys., xci., 1820. 

 Stenorhynchus leptonyx, F. Cuvier, Diet. Sc. Nat., xxxix. : 

 Gray, Zool. Voy. Erebus and Terror, 1875. 



Tympanic bulla triangular, with pointed antero-internal 

 apex, not much swollen, with ridge running from 



