SIWALIK AND NABBADA EQUIDiE. 
25—91 
These dimensions show that the relative proportions of the fossil jaw are 
nearer to those of the jaw of the kiang than to that of the horse. Unfortunately 
none of the specimens show the ‘ angle * of the mandible, in which there is such 
a marked difference in the two living species. The inferior border is arched, and 
very thick as in the kiang. 
A symphysis of the mandible of a fossil horse in the Indian Museum, one of 
Mr. Theobald's Siwalik collection, shows that this portion of the jaw was elongated 
as in the living horse, and strikingly different from the corresponding part in the 
kiang. I cannot, however, say whether this specimen may not belong to E. nama- 
dicus ; it agrees exactly in form with the symphysis of the mandible of JE. sivalensis 
from the Siwaliks drawn in figure 6 of Plate LXXXII of the “ Eauna Antiqua 
Sivalensis,” but that reference may be incorrect. 1 
Upper mil/c-molars. — In figure 1 of plate XY are represented the milk-molars 
of a young colt of a species of Equus from the Siwaliks. It is probable, from the 
evidence of a specimen of upper milk-molars from the Narbada to be described 
under the head of the next species, that the present specimen bolongs to JE. sivalensis. 
These teeth agree in general form with the milk-molars of the domestic horse, 
presenting the elongated form usually characteristic of the deciduous series. These 
teeth are contained in a fragment of the right maxilla, collected by Mr. Theobald ; 
the portion containing the first milk-molar has been broken away. 
Other remains. — The Indian Museum possesses a considerable series of limb- 
bones of true horses from the Siwaliks. It is not, however, possible to be certain 
as to the species to which these should be referred, and accordingly only such of 
them will be noticed as bear on the question of the reputed monodactyle character 
of Uippotherium antilopinum. 
Gannon and phalangeal bones . — There are a considerable series of ‘cannon 5 and 
phalangeal bones in the Indian Museum, obtained by Mr. Theobald from the upper 
Siwaliks of the Kangra district, in company with the teeth of Equus sivalensis , 
which may probably be referred to that species, and certainly to the genus Equus , 
as the remains of j Uippotherium have not been obtained from these higher beds. 
These bones are of a slender type, and many of them agree with the ‘ cannon ’ and 
phalangeal bones figured in the c£ Eauna Antiqua Sivalensis ” as belonging to 
R. antilopinum . 2 
It may be noticed in passing that the last mentioned specimens are, as already 
said, those on the evidence of which M. Gaudry stated that H. antilopinum was un- 
provided with lateral phalanges. There is little, if any, doubt but that these bones 
belong to Equus. No hippothere has the first phalangeal bone so constricted. 
Other corresponding bones are figured in the same plate of the “Eauna 
1 In the description of the plate the specimen is erroneously said to belong to the maxilla. 
* PI. LXXXV, figs. 11 to 14. 
