and Sea-Lions in the British Museum, 233 



the form of the hinder nares, which are extended much more for- 

 wardsj so that the front end, which is very narrow and acute, is 

 much in front of the prominence of the orbit of the zygomatic 

 arch, being, in fact, about in a line with the middle of the lower 

 edge of the orbital concavity. 



This skull is evidently that of a very young animal, for the 

 bones are separate ; but it has the same number and disposition 

 of the teeth as the large skull. There is the same wide space 

 between the fourth and fifth upper grinders ; but there is at the 

 back edge of the fourth grinder, on the right side of the skull, 

 a small pit, from which, no doubt, a small rudimentary tooth 

 has fallen out ; and there is a much wider but shallow pit on 

 the other side, which may have been produced by the loss of a 

 rudimentary tooth ; the last upper grinder has a large swollen 

 undivided root. If this is a young skull of Eumetopias Monte- 

 riensis, that species is curious for having the teeth in the old and 

 young skulls in the same situation as regards the bones of the face. 



The adult skull and the young one were from the same loca- 

 lity, and, I believe, collected by the same person; and this 

 being the case, I am inclined to regard them as the same, only 

 showing a curious peculiarity in the growth of the animal, and 

 also showing that the form and position of the hinder nostril 

 probably varies as the animal increases in age. 



Eumetopias Stelleri. Northern Sea-Lion or Fur-Seal. 



Arctocephalus Monteriensis, Gray, P. Z. S. 1859, t. 72 (skull). 



Eumetopias Californiana, Gill. 



Otaria Stelleri, Gray ; Peters ; Miiller ? 



Leo marinus, Steller. 



Phocajubata, Pander & D'Alton, t. 3. f. rf, e,/ (skull, not good). 



Phoca Califomica et P. Stelleri, Fischer. 



Lion marin de la Calif ornie, Chloris, Voy. Califor. 1. 11. 



Hah. California; Behring^s Straits. 



The Sea- Lion of Steller has been one of the zoological para- 

 doxes. Professor Nilsson, like most preceding authors, regarded 

 it as a variety of the Otaria juhata ; and therefore I supposed it 

 might be a second species of the restricted genus Otaria. Dr. 

 Peters has solved the enigma by uniting it to the Seal which I 

 described from California, observing that the skull in the Berlin 

 Museum, figured by D'Alton under the name of " Steller's Sea- 

 Lion " {Phoca juhata), was received from Kamtschatka, and a 

 second skull of an old male in the Berlin Museum was received 

 from M. Brandt as coming from Behring's Straits. 



It is to be regretted that these skulls escaped the researches 

 of Professor Nilsson, who visited most museums in Europe to 

 examine the typical specimens. 



The specimen of Callorhinus ur sinus, now in the Museum, was 

 received- from St. Petersburg as Otaria leonina, or Leo marinus 



