129—42 CRANIA OR RUMINANTS RROM THE INDIAN TERTIARIES. 
occiput is not continued upwards in tlie plane of the infra-cristal portion, but 
slopes forwards to join the f rentals by a gentle curve, so that there is no well- 
marked and angular intercornual ridge overhanging the occiput; between the superior 
angles of the horn-cores, the surface of the frontals is concave from side to side. 
The occipital crest or curved line itself forms a very wide and flattened arch ; 
the extremities of the indentations of the temporal fossae are situated entirely above 
the summit of this arch ; and the horn-cores, again, are above these, so that there 
is a considerable vacant space between the true occipital surface and the horn- 
cores ; the temporal fossae cut deeply into the occiput on either side, so that the 
width of the parietals between them is probably not greater than the interval 
between the external angles of the occipital condyles. The proper muscular 
surface of the occiput is deeply marked by ridges and grooves ; a circular depres- 
sion occurs immediately above the summit of the crest ; at the highest point of the 
frontals the outline of the intercornual ridge is convex. 
The horn-cores are triangular in cross-section and are set obliqiiely on the 
frontals ; their superior angle is somewhat below or in advance of the plane of the 
true occipital surface, so that they are not situated on the highest portion of thfe- 
cranium. The cross-section of the base of the horn-cores has the form of an 
isosceles triangle, the inferior surface forming the base of the triangle ; the plane 
of the anterior surface is continuous with the plane of the frontals ; their antero- 
inferior angle is round and blunted, wliile their superior angle is remarkably sharp, 
and looks directly upwards. Then’ inferior surface is situated nearly at right angles 
to the plane of the frontals; their postero-inferior angle is the most obtuse of 
the three. The horn-cores diminish somewhat rapidly in diameter, and are directed 
outwards, upwards, and somewhat forwards, forming one regular curve, the upper 
border being concave, and the lower convex throughout their length ; at a distance 
of nine inches from the median line of the skull, the anterior surface of the horn- 
core is placed one and a half inches in advance of the plane of the frontals ; there 
is a small “burr ” at the junction of the horn-cores with the frontals. 
Erom the imperfection of the lower portion of the face it is impossible to 
determine the relations of the premaxillse to the other bones. 
The measurements of this specimen are given below in inches 
Width of cranium at superior border of orbits 
. 9'3 
„ at constriction above orbits 
. 8-4 
Intei'val between occipital crest and superior angle of born-cores . 
. 3-2 
Length from superior angles of horn-cores to apex of nasals 
. 80 
Width of parietals between temporal fossae . 
. 50 
Interval between superior angles of bases of horn-cores 
. 4-0 
„ „ antero-inferior angles of ditto . 
. 90 
5, „ orbit and base of horn-core 
. 24 
Antero-posterior diameter of right orbit 
. 2-9 
Interval between supra-occipital foramina . . 
. 4-5 
Length of temporal fossa . . . . 
. 7-0 
Width of nasals at widest part . 
. 2-6 
