159—72 CRANIA OR RUMINANTS PROM THE INDIAN TERTIARIES. 
The compressed horn-core and the large supra-orhital sinus approximate this 
species to the Gazelles ; it is, however, distinguished from the living species of that 
genus hy the inner border of the horn-core being concave instead of convex, by 
the frontal being proportionately shorter, and hy the supra-orhital sinus being wider 
and more open at the base. 
The species is distinguished from Antilope palceindica hy the horn-cores being 
placed wider apart at the base, by their curvature and direction, and by the presence 
of the large supra-orhital sinus and foramen. 
With the frontlet of Antilope patuUcornis the present specimen presents no 
points of resemblance. 
Erom Antilope sivalensis the specimen is distinguished by its smaller size, and 
by the direction of the horn-cores, which rise vertically from the frontals in that 
sj)ecies ; further, the supra-orhital sulcus and foramen are entirely distinct from the 
horn-core in the present specimen, while in A. sivalensis, they are situated on the 
base of the horn-core ; the sulcus also is much larger, and the frontal shorter in the 
present species. 
If the complete cranium be ever diseovered, I imagine that it will be found to 
correspond in general character with the crania of the Gazelles, among which group 
I think the species should probably be placed. 
Family,— SIVA THFBID^. 
Genus : HYDASPITHERIUM, nov. gen. noUs. 
This genus of Sivatheroid animals was originally erroneously named Hydaspi- 
dotlierkim the characters of the genus will be gathered from the description of the 
cranium on which it is founded. It may not be out of place to state here that 
several lower jaws and detached molars have recently been obtained from the Punjab, 
which indicate the former existenee of other species. 
Hydaspitherium megacephalum, nov. sp. noUs. Pis. 26 & 27. 
The magnificent cranium figured in the accompanying plates is perhaps one of 
the most interesting of the fossils discovered by Mr. Theobald in the Siwaliks of the 
Punjab ; it belongs to that strange group of animals represented in the Tertiary 
period of India by Sivatlierium, BramatJierium, and Vislinutherium, a group which 
connects the still living and isolated genus Camelopardalis with other families 
of the order. The distribution of this group in India, as far as we can at 
present judge, is peculiar : Sivatherium seems to have ranged from the Debra Dun 
district as far as the eastern side of the Punjab ; in the Western Punjab its remains 
1 Rec. Geol. Surv. Ind., Vol. IX, p. 154. 
