78—12 INDIAN TERTIARY AND POST-TERTIARY VERTEBRATA. 
Siwaliks of tlie Funjab. As the specimen comes from a horizon in the Siwaliks 
(as inferred from its mineral condition), where no remains of JEquus occur, and as it 
presents certain peculiarities characteristic of the lower dentition of Hippotherium, 
it may he referred to that genus. Since the specimen is smaller than, and of 
different proportions from, another jaw of the same genus referable to the next 
species, it seems probable that it may be referred to H. antilopinum. This speci- 
men shows five teeth, the two anterior of which (pm. 8, pm. 4) are stouter and 
less worn than the succeeding tooth (m. 1,) whence it is inferred that the five teeth 
are respectively the two last premolars, and the three true molars. 
The premolars (pm. 3, pm. 4) are considerably wider and stouter than the 
true molars ; the last true molar is extremely thin : the four anterior teeth exhibit 
at their antero-external angles a semi-detached column of enamel, very characteris- 
tic of the lower molars of this genus. 1 11 The fragment of the mandible remaining 
shows that the inferior border was highly convex towards the middle. 
The dimensions of the specimen are as follows : — 
Depth of jaw at pm. 3 2 - l 
„ „ „ m. 1 2-65 
Length „ five teeth 5'0 
„ „ three true molars 2 - 92 
„ „ 3rd premolar 1^08 
Width „ „ „ . ■ 061 
Length „ 4th „ . . , 1*1 
Width „ „ „ . . 0'6 
Length „ 1st true molar 0'94 
Width . 0'5 
Length „ 2nd „ * 0 96 
Width „ „ „ . 0-48 
Length „ 3rd „ . . . . . . . , . . . . l - 02 
* Width „ „ 0-43 
Lower milk-molars. — In figure 1 of plate XII there is represented a part of 
the left mandible of a young hippothere, collected by Mr. Theobald in the Punjab. 
This specimen shows four teeth, namely, the three last milk-molars (mm 2, mm 3, 
mm. 4), (inferred to be such from the fourth tooth (m. 1) in the specimen being 
less worn than the preceding one), the first true molar (m. 1) just touched by 
wear, and the alveolus of the second true molar. The specimen is inferred to 
belong to a Hippotherium from the district whence it was obtained, and from the 
presence of the detached column of enamel on the outer side of the third milk- 
molar. Prom the exact similarity of the first true molar (m. 1) in this specimen 
with the corresponding tooth in the last specimen, the jaw is inferred to belong 
probably to H. antilopinum . It will be noticed that the milk-molars are of smaller 
dimensions than the premolars in the last specimen. The length of the three milk- 
molars is 3- 7 inches. 
1 This column is scarcely perceptible in the figure ; it is well shown in figure 10 of plate V of Gaudry’s 
11 Animaux Fossiles du Mont Leberon.” 
