165—78 CRANIA OF RUMINANTS FROM THE INDIAN TERTIARIES. 
Width across zygomatic arches .... 
5, „ tuberosities of maxillae .... 
„ in front of first premolar .... 
Depth from palate to root of nasals .... 
Interval between orbit and fractured summit of frontal (right side) 
Whdth of occiput across paroccipital processes 
Interval between inferior border of foramen magnum and occipital crest 
» i> occipital crest and fractured summit of frontals 
Width above occipital crest .... 
„ across temporal fossae .... 
Interval between external angles of occipital condyles . 
Length of right occipital condyle 
Vertical diameter of foramen magnum 
Transverse „ „ • • 
Vertical diameter of left orbit 
Transverse „ „ ... 
Interval between foramen magnum and posterior basi-occipital tubercles 
„ „ posterior basi-occipital tubercles 
„ „ foramen magnum and fi-ee border of palate 
Width of palate at last molar . 
„ „ second premolar 
Interval between outer surfaces of last molars 
„ „ „ of second premolars 
Length of five molars 
Length of last molar 
Width of hinder barrel of last molar . 
„ fore „ „ 
Length of penultimate molar 
Width of fore barrel of penultimate molar 
Length of first molar . 
IVTdth of fore barrel of first molar 
Length of last premolar 
Width of „ „ . . 
Inches. 
13-30 
10 - 30 
5 - 00 
700 
6 - 50 
11 - 40 
7 - 30 
3-80 
7 - 70 
6-30 
5 - 40 
3 - 10 
2-40 
1 - 90 
2 - 60 
2-80 
2-70 
0-60 
11-40 
4 - 90 
4-20 
8 - 00 
6 - 20 
6-35 
1-60 
1-54 
1-70 
1-50 
1-65 
1-42 
1-70 
1-00 
1-50 
We maiy now compare the cranium of the new genus with the crania of the 
allied genera ; the present cranium is distinguished from that of Bramatherimn by 
the absence of the parietal pair of horn-cores, in consequence of which the crest 
of the occiput is simple and uninterrupted; instead of the convex profile of 
the cranium of Bramatherium the present cranium has a very markedly concave 
])rofile. The base of the horn-cores is widely separated from the orbits, and is as wide 
as the skull above the orbits ; in Bramatherium, on the other hand, the base of the horn- 
cores is approximated to the orbits, and is constricted at its origin from the frontals ; 
the occiput of Hydaspitherium is more quadrate and wider in proportion to its 
height than the occiput of Bramatherium ; no figure of the basis cranii of the latter 
genus is given in Mr. Bettington’s Memoir. The crania of both genera agree in 
having the supra-orbital horns arising from a common base — a character which is 
found in no other Ruminants. The form of the horn-cores of both the genera is 
unknown, though they were probably massive and branched like the posterior horns 
of Swatherimn. And here a question arises as to the homology of the horns of 
