109 



II. Face of skull moderately elongated. Forehead rather convex, 



slightly rounded from nasal bone to vertex. Lower jaw elon- 

 gated, slender. 



Arctocephalus hookeri. 



Arctocephalus hookeri, Gray, I. c* p. 45 ; Voy. Erebus and Terror, 

 t. skull. 



Palate deeply concave in front, narrow and rather concave behind, 

 with a deep hinder aperture, which has a transverse truncated front 

 edge with a slight central lobe directed backward ; outer upper 

 cutting-teeth very large, conical, acute ; orbit moderate ; zygoma 

 slender ; angle of jaw bent inwards. 



Hab. Falkland Islands (and Cape Horn?). 



The skull of four half-grown specimens. They are all very uni- 

 form in their characters. 



We have also the skull of a very young Seal which appears to be- 

 long to the same species. 



In three of the skulls the outer upper cutting-teeth are very large 

 and acute, more than half the size of the canines, and like them in 

 form. In one skull (perhaps of a female ?) the upper outer canines 

 are much smaller and more slender, not half the size of the same teeth 

 in the other skulls of the same size, and the canines themselves are 

 also much more slender; the front of the palate is also more concave. 



III. Face of skull moderately elongated ; forehead flattened from 

 nasal bone to the vertex. Lower jaw rather short, strong. 



Arctocephalus delalandii. 

 Otaria delalandii, F. Cuvier. 



Face rather short ; palate concave, hinder aperture narrow, with 

 a rather acute ovate anterior edge ; teeth large ; lower jaw short, 

 strong. 



Hab. Cape of Good Hope. 



Two skulls of adults from the Cape (PL LXIX.) ; and one half- 

 grown, habitat unknown. These skulls agree in the form of the 

 hinder palatine opening, but vary in other respects a little from each 

 other : the two adult ones differ in the aperture of one being wider 

 and shorter than that of the other ; in the young skull the front edge 

 of the aperture is more acute in the centre than in either of the 

 others ; the outer cutting- teeth of the upper jaw are large, but much 

 smaller than the very large canines. 



• ft 



Arctocephalus nigrescens. 



Arctocephalus nigrescens, Gray, Zool. Erebus and Terror, t. 

 f. , skull (inedit.). 



Face rather elongate. Palate slightly concave, flat behind, hinder 

 aperture narrow, with a nearly straight front edge. 

 Hab. Falkland Islands? 



