157—70 CRANIA OR RUMINANTS FROM THE INDIAN TERTIARIES. 
It wiU be seen from the above that the proportions of the crania of the two 
species are very similar, but the differences noticed above are sufficient to distinguish 
between the two. 
The fossil cranium differs very markedly from that of Antilope palceindiaa of 
Falconer ; it is much smaller in size, the horns differ in form, position, and direction, 
while the facial and nasal portion are much smaller in proportion to the frontal ; the 
profile of A.palceindica is concave, while it is nearly straight in the new species ; the 
orbit of the former is entirely behind the molar series, and above it in the latter 
species the supra-orbital foramina are very minute, and without a sinus in A. palce- 
indica, while in A. swalensis they are large. It is quite probable that the latter 
may have been the progenitor of the living Indian antelope, the twisted horns of 
the living species being a recently acquired character. 
ANTihOPE PATULicoRNis, n. sp. noUs. PI. 25, f. 3. 
This the third fossil Indian species of the genus is founded on the imperfect 
frontlet figured in Plate XXV, fig. 3, collected by Mr. Theobald in the Siwaliks. 
Though in a very imperfect state, the specimen is very distinct from either of 
the other two Siwalik antelopes ; indeed it is more than probable that it should 
not be referred to the restricted genus Antilope at all, but should rather be placed 
in a separate genus ; its affinities, however, are mostly Antilopine, and I have 
therefore placed it in the type genus, until more complete specimens enable us to 
define its position more exactly. 
The specimen comprises the greater portion of the frontal bones with a portion 
of the horn-core of the left side ; on the posterior surface the greater part of the 
orbital cavities and the anterior extremity of the cerebral cavity are preserved. 
The horn-cores are placed at a short distance above the orbits, and have a 
considerable interval between their bases ; the frontal suture forms a somewhat 
elevated median line, with a longitudinal hollow on either side. At a short dis- 
tance above the border of the orbit there is a very large supra-orbital fossa, 
triangular in shape ; at the superior angle of this fossa, the frontal is pierced by a 
supra-orbital foramen, circular, and of unusually large size ; it passes directly 
through the frontal into the cavity of the orbit. 
The horn-cores present an ellipsoidal cross-section ; they are longitudinally 
marked by parallel ridges and grooves : their general direction is upwards, back- 
wards, and outwards, in a single gentle curve ; their anterior surface is convex 
and the posterior concav^e ; there is a faint trace of a spiral arrangement of the 
grooves on the cores ; the diameter scarcely diminishes at all, in the fragment pre- 
served, towards the extremity. The frontals are of considerable thickness, with 
finely cancellated structure between the outer and inner tables. 
On the posterior aspect the specimen shows the anterior part of the cerebral 
cavity, as far down as the commencement of the cribriform plate of the ethmoid ; 
