76—10 INDIAN TERTIARY AND POST-TERTIARY VERTEBRATA. 
may have been present in the complete jaw. The last true molar has only just 
come into wear. This specimen will he termed a. 
In figure 16 of the same plate a palatal specimen is figured ; it shows the three 
true molars and the last premolar ; it is of slightly larger size than the last specimen 
and will be alluded to as specimen b. 
In figure 18 of the same plate a detached upper molar is figured of the natural 
size. 
In figure 1 of plate SI of this memoir there is drawn part of the left upper 
molar dentition of a species of Kippotherium , collected by Mr. Theobald in the 
Siwaliks of Niki, in the Punjab. The second tooth in this specimen (pm. 4) 
being less worn than the succeeding tooth, is inferred to he the last premolar, 
whence the four teeth will he, respectively, the 3rd and 4th premolars (pm. 3, pm. 4) 
and the 1st and 2nd true molars (m. 1, m. 2). Erom the size of the teeth in this 
specimen (which we shall call specimen c) it is inferred to belong to H. antilopinum. 
The teeth are of the normal hippotherian type, showing the characteristic isolated 
anterior ‘ pillar,’ and the plications of the central islands of enamel. The premolars 
are somewhat larger than the true molars, and the grinding surfaces of all the teeth 
are approximately square. 
In the following table the dimensions of the three specimens above noticed are 
compared together ; the specimens are indicated by the letters given above — 
Width of palate posteriorly . 
„ „ „ between 3rd premolars 
Length „ molar series . 
„ „ three true molars 
„ „ 1st premolar 
Width . 
Length . 
Width 
Length . 
Width , 
Length , 
Width , 
Length , 
Width , 
Length , 
Width i 
2nd 
1-25 
0-83 
0-96 0'9l 
095 
0-93 0 
0-86 
0-8 
0-85 0 
0-85 
076 0 
8 0-85 
0-85 
075 
The comparatively slight variations in these dimensions leave little room for doubt 
that the three specimens belong to the same species, seeing that no difference in the 
form of the teeth can be detected. 
Upper milJc-molars . — The next specimen for notice is the anterior portion of the 
palate of a colt, also collected by Mr. Theobald in the Siwaliks of the Punjab near 
the village of Niki. In figure 2 of plate XI of this volume the dentition of the left 
side of this specimen is figured. The teeth shown are the' four milk- molars (mm. 1 
to mm 4.), and the germ of the first true molar (m. 1), which has never come into 
