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to serve as well for this new and singular genus, except that there 
seems to be no suborbital depression, and the masseteric ridge, as 
may be expected from the general elevation of the skull, does not rise 
before the orbit. The horns, whose peculiar twist must constitute the 
diagnosis of the genus Budorcas, appear, from the rough figures 
given, to have the wrinkling at the base very similar to that in Ne- 
morhcedus. 
The following genera may be considered as in some degree allied, 
and deserve the name of Caprine Antelopes. They have no sub¬ 
orbital sinus, but have a fissure in the skull, and their incisors are 
not widened at the summits. 
Rupicapra. 
A minute suborbital fissure, but no fossa ; the masseteric ridge 
ascending high before the orbit; the auditory bulla very small and 
compressed; the basioccipital bone flat; the incisors equal-sized, 
vertical; the molars without supplemental lobes. 
Horns slender, round, vertical, and hooked backwards at the tip. 
Hab. Europe. 
R. tragus. 
Dicranocerus. 
No suborbital depression ; the fissure lengthened ; the nasal bones 
widest posteriorly; the orbit a little elevated above the line of the 
face, and the masseteric ridge not rising before it; the auditory bulla 
moderate, compressed and angular ; the incisors equal-sized, sloping ; 
the molars without supplemental lobes. 
Horns vertical, compressed, with a process on their anterior side, 
and hooked backwards at the tip. 
Hab. North America. 
D. Americanus. 
Aplocertjs. 
Horns round, vertical, gently curved backwards. 
Hab. North America. 
A. Americanus. 
I have seen no skull of this animal, but leave it for the present in 
this location. 
I must forego all notice of the Ixalus probaton of Mr. Ogilby, as 
there is no skull to be seen, and the horns in the only specimen 
known are quite in a rudimentary condition. 
The genera next to be considered are the “ Cervine Antelopes ” of 
Mr. Gray, exclusive of the genus Kolus, which I have rejected. With 
the exception of the Nyl-Ghau and some of the Eleotragi, they are 
the only members of the old genus Antilope that have well-developed 
supplemental lobes in all the true molars; they have always been 
placed near together. 
