10 



Now the head of Cuvier's Loudon Skeleton was very nearly a 

 foot longer than that of the Audierne one ; and, with the ex- 

 ception of the width of the occipital foramen in the two animals, 

 which we find to be rather larger in the Audierne specimen, we 

 observe the above relation in size to be well kept up throughout 

 the dimensions of the respective parts of the head. So well kept 

 up, indeed, as to incline us to adopt the idea that these two 

 animals of the Paris Museum must have belonged to the same 

 species. In Cuvier's London and Audierne skulls, as also in the 

 heads deposited in the British and Sydney Museums, the whole 

 length of the head is to the length of the snout always in the same 

 proportion, viz., as 13 to 9. Nevertheless, the Sydney skull differs 

 in a very important point ; for while the British Museum upper 

 jaw appears to belong to the same species as the two Paris skulls, 

 not only on account of the above proportion, but also on accoimt 

 of the width of the snout at the ante-orbital notches in all three 

 being always less than one-third of the whole length, this width 

 in the Sydney skull is considerably more than one-third of the 

 whole length. Again, the width of the head between the orbits 

 in the Yorkshire skeleton, Cuvier's London, and the Audierne 

 skulls, is always less than one-half the length of the head. In 

 the Sydney skull it is considerably more. In Cuvier's London, 

 and the Audierne skulls, the height of the occipital part of the 

 skull is nearly equal to one-third of the whole length. In the 

 Yorkshire skeleton, according to Beale, it is considerably less ; 

 and in the Sydney skull considerably more ; — so that, in general, 

 the Sydney skeleton is further removed from the Yorkshire 

 skeleton than from the three others. And if these last three be 

 considered to belong to one species, viz., the Gatodon onacro- 

 cephalus of Grray, or Northern Atlantic sperm whale, we may 

 infer that the Sydney skeleton belongs to another species of the 

 same genus, which, whether identical or not with Quoy's Physeter 

 pollicyplius, that is, Desmoulins' P. Australis, is certainly nearer 

 in structure to the true Atlantic sperm than to the Yorkshire 

 skeleton. The Sydney whale is assuredly not the Kogia hreviceps 

 of G-ray, for this Cape of Good Hope whale is said to have the 



