46 
Records of the Geological Survey of India. 
[vOL. XII. 
The premolar is rounded, and carries two transverse ridges and two small talons. 
The larger tooth corresponds exactly in form with the first or antepenultimate 
molar of M.. jjermiensis from Perim Island, represented on plate 9 of the first 
volume of the “ Paleontological Memoirs of Dr. Falconer,” and which is now 
in the Indian Museum. Mr. Theobald’s S 2 iecimen is, however, rather the smaller 
of the two. From the large size of the pi’emolar in the new jaw, I think that 
that tooth must he the last, and that the tooth which it has rejilaced must con¬ 
sequently have been the last milk-molar; the second tooth will consequently be 
the first or antepenultimate true molar, and will correspond to the above- 
mentioned specimen of Falconer’s : the slight difference in size of the two speci¬ 
mens is very jirobahly duo to difference of sex. 
I have already mentioned at page 71 of the last volume of the “ Eecords ” 
the discovery of a comjjlete mandible of this species, and of the possible occur¬ 
rence of lower tusks. Two specimens of the symphysis of the mandible of the 
same species in Mr. Theobald’s last collection have now made it certain that 
certain individuals, probably males, were furnished with small mandibular tusks. 
Both the new specimens Lave been fractured, and exhibit sections of the tusks 
in their alveoli ; these tusks were of small size, and show an oval cross-section, 
of which the vertical diameter in the middle of the symphysis is 1‘6 inches, 
and the transverse diameter 1‘3. 
PEKISSODACTYLA. 
Acekotheeium peeimekse, Pale. & Caut. 
The discovery of a nearly complete cranium of this species in the Siwaliks 
of the Punjab by Mr. Theobald is of great interest, as only very fragmentary 
remains of the species have hitherto been known. The new cranium is further 
interesting, as showing the accuracy of Falconer’s opinion (formed on the evi¬ 
dence of a few generally imperfect teeth), that the Perim Island Rhinoceros 
was hornless, and belonged to the genus Acerotherium. 
The cranium, with the exception of a few minor injuries, only lacks the 
extremity of the nasals, and maxillai and premaxillso, together with the greater 
part of the zygomatic arches, to be complete, and is generally in a very excellent 
state of preservation. As I shall hoj)e on a future occasion to give a figure and 
a more detailed description of this cranium, it will only be noticed very shortly 
here. 
The cranium is that of a fully adult animal, the permanent molars being 
greatly worn down, and the cranial sutures mostly obliterated; it is also of huge 
dimensions. It is at once distinguished from the three species of true Siwalik 
Rhinoceros, of which figures of the emnium are given in the “ Fauna Antiqua 
Sivalensis ” by its straight jirofile, in place of the highly curved profile which 
characterizes the other species. It is further distinguished by the very small 
size of the nasals : these bones are unfortunately broken off near their base, but 
sufficient of them remains to show that they formed merely a short conical pro- 
