and Sea-Lions in the British Museum. 233 
the form of the hinder nares, which are extended much more for- 
wards, 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 Humetopias 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 
bemg 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; Miller? 
Leo marinus, Steller. 
Phoca jubata, Pander & D’ Alton, t. 3. f. d, e, f (skull, not good). 
Phoca Californica et P. Stelleri, Fischer. 
Lion marin de la Californie, Chloris, Voy. Califor. t. 11. 
Hab. 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 jubata; and therefore I supposed it 
might be a second species of the restricted genus Ofarta. 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 jubata), 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 ursinus, now in the Museum, was 
received from St. Petersburg as Otaria leonina, or Leo marinus 
