EHINOCEEOS DECCANENSIS. 
11 
the Kne of the outer wall of the tooth, and far from parallel to the axis of the 
median collis (e). The outer wall is entirely wanting, and so in fact is the masti- 
catory surface of the entire tooth, that of the anterior collis only excepted. 
Molar 3, though unhappily also much damaged, is more perfect than molar 2, 
and exhibits the trihedral form seen in most of the Rhinocerotes. It had under- 
gone hut little wear at the time when its owner was entombed. This is proved by 
the great height of the anterior collis. 
The guard occurs only on the anterior walls very much below the crown of the 
collis. As in the other teeth the anterior vaUey is extremely deep, and was intruded 
into a very stout and long crochet {hz ), the base of which is seen at some depth. 
The posterior coUis (/) is represented by a little spur-like cusp (shown in figs. 1 
and 2, Plate I) low down on the posterior angle of the tooth. 
The teeth of both jaws are furnished with long fangs, but they were not 
exposed sufficiently in any case to observe any peculiarities they may possibly 
possess. 
The thickness of the enamel varies greatly in different parts of the teeth, 
being thickest in the walls of the median collis and thinnest in the walls of the 
crochets and in the exterior walls of the anterior valleys. In the lower molars it 
was thickest in the outer wall, and thinnest in the walls of the anterior collis. 
The length of the upper molar series measured along the edge of the crowns 
from the posterior angle of molar 3 to the anterior angle of premolar 2 is 10‘9 inches. 
As before mentioned (page 6), the supradental part of the left maxillary bone 
is much affected by crushing, so much so that when the malar bone is placed 
in apposition its plane lies almost at a right angle to its normal position. The 
distortion is greatest above the true molars. On account of this distortion the 
zygomatic arch has not been figured. It forms a strong broad band connecting 
the maxilla with the squamosal bone by a rather flat arch. The zygomatic process 
is unfortunately rather broken at its base, and the connection of the zygoma with 
the squamosal bone therefore incomplete. 
The lachrymal bone shows a well marked post-orbital projection, and the malar 
bone has a distinct protuberance on its upper edge opposite to the position the post- 
orbital process would occupy if developed in this genus. 
The squamosal bone is figm*ed in Plate III, fig. 1, in order to show the peculiar 
form of the groove between the post-glenoid and post-tympanic processes in 
which the meatus auditorius is situated, as the form of this part of the cranium in 
Rh. Deccanensis differs very greatly from many other species, as will be shown 
further on in enumerating the points of difference between this and other allied 
species. 
The area between the two processes is wide and shallow at its upper part, 
rather deeper below the opening of the meatus ; in plan it is very nearly rhom- 
boidal. The post-glenoid process terminates in a lobe about two-thirds of an inch 
below its inferior junction with the post- tympanic. The latter process is greatly 
