

650 



processes : there are no anterior ones. The rhinencephalic fossa is narrow, but of unusual 

 longitudinal extent : the optic nerves traverse a common canal of nearly an inch in extent 

 before it divides. The ascending plates from the palatine processes of the maxillary form an 

 unusually deep groove for the reception of the vomer. The anterior parts of the left upper 

 jaw and of both rami of the lower jaw have been the seat of disease in this specimen. The 

 individual bones in the right half of the section are numbered according to the TABLE OF 

 SYNONYMS. 



The specimen was a male ten feet in length, seven feet in girth, and was killed in Public 

 Sound, Falkland Islands, by Lieut. Robinson, R.N. 



Presented by Admiral Beaufort, C.B., F.B.S. 



3972. The right external laniariform incisor of the Otaria jubata. Hunterian. 



3973. The right upper and lower canines of the Otaria jubata. Hunterian. 



3974. The right upper canine of the Otaria jubata. Hunterian. 



3975. The right lower canine of the Otaria jubata. Hunterian. 



3976. The left lower canine of the Otaria jubata. Hunterian. 



3977. The skull of an Otaria. 



It differs from the Otaria leonina in the angular emargination of the posterior palate, each 

 side of the notch showing a small projection. The upper margin of the foramen magnum is 

 pierced by two venous sinuses. The mastoid is broader than it is deep. The jugular foramina 

 are longer than they are wide : the petrosals do not send down the wedge-shaped process. The 

 pterygoid processes are pierced by the ectocarotids. The zygomatic arches are much more 

 slender : the frontals form a greater proportion of the prosencephalic chamber, and have rela- 

 tively smaller superorbital plates. The bony palate is much shallower than in the Otaria 

 jubata. In many respects this skull is more nearly allied to the Arctocephalus, but the sixth 

 socket is too distinct to permit any other inference than that it contained a tooth, which would 

 give it the dental formula of Otaria. 



Hunterian. 



3978. The lower jaw of an Otaria. 



This is smaller in size, and with relatively much smaller canines, than in the female Otaria 

 leonina. The cingulum is less developed on the inner side of the molars. 



Hunterian. 



