CRANIA OP RTJAIINANTS PROM THE INDIAN TERTIARIES. 69—156 
forms a triangular process fitting in between tlie nasals and frontals ; at tlie junction 
of the lachrymo-frontal, naso-frontal, and naso-lachryinal sutures there is a small 
elongated fissure representing the larger infra-orbital vacuity of other antelopes. 
The facial surface of the lachrymal is much depressed. The maxillse have a 
large tuberosity above the second molar. With the exception of the direction of the 
horn-cores and the smaller size of the supra- orbital sinuses, the whole of the above 
characters exactly correspond with those of the cranium of Antilope cervicapra. 
On the inferior aspect the basi-occipital is rather different from that of the 
recent species : the posterior tubercles are nearly similar in both ; the anterior pair 
of tubercles in the recent species are very large, and nearly three quarters of an 
inch in height, and are separated by a long interval from the posterior pair ; in tlie 
fossil species the two pairs of tubercles are more closely approximated, and the 
anterior pau are but very slightly raised above the surface of the basi-occipital : in 
consequence of their small size the whole basi-occipital becomes somewhat triangular 
in form. By the approximation of the two pairs of tubercles the tympanic bulla 
appears to be placed more anteriorly than in the recent species, being partly in 
advance of the anterior border of the first pair of tubercles, whereas in A. cerm- 
capra it does not extend farther forward than the middle of these tubercles. 
The palate of the fossil species is considerably wider in proportion to its length 
than in the recent species ; the embedded crowns of the molar teeth also show a 
greater width in proportion to their length, the grinding surface being probably 
nearly square instead of oblong. Whether the maxillse presented the peculiar 
sickle-hke edges on the palatal surface, which are found in the recent species, we 
are unable to say from the present specimen. 
The measurements of this cranium are given with those compared below with 
those of a cranium of an adult specimen of Antilope cervicapra : — 
A. cervicapra. A. sivalensis. 
Width at superior border of orbits .... 
Inches. 
. 4-30 
Inches. 
5-20 
„ inferior „ „ . 
. 3-40 
4-10 
Interval between outer sui'faces of born-cores at base 
. 3-40 
4-10 
„ „ bases of horn-cores 
. 1-00 
0-90 
„ „ superior angles of supra-orbital foramina . 
. 1-70 
2T0 
Direct distance between extremities of inter-frontal suture . 
. 2-60 
3-50 
Interval between middle of fronto-parietal and occipito-parietal sutures 
. 2-00 
2‘20 
„ „ inferior border of foramen magnum and summit of occipital crest . 1'80 
2-49 
„ „ occipital crest and occipito-parietal suture . 
. 0-70 
0-90 
Greatest width between temporal fossae 
. 2-70 
3-20 
Width of occipital through petrosals .... 
. 3-40 
3-80 
Interval between meatus auditorius and orbit 
. 1-70 
2T0 
Antero-posterior diameter of right orbit 
. 1-70 
2T0 
Transverse „ „ ... 
. 1-50 
1-70 
Interval between inferior border of foramen magnum and palate 
. 3-60 
4-30 
Width of palate between last molars .... 
. 1-50 
1-80 
Interval between outer sides of last molars 
. 2'30 
3-40 
Length of three last molars ..... 
. 1-60 
2-20 
„ last molar ..... 
. 0-65 
0-80 
Breadth ....... 
. 0-45 
0-65 
Circumference of base of right horn-core 
. 3-80 
4-90 
