ADDITIONAL SIWALIK PERISSODACTYLA AND PROBOSCIDIA. 7 
\ 
the right ramus of a calf, with one milk-molar remaining, is represented in plate II., 
fig. 3. The lower molars have a faint trace of an external cingulum. The inferior 
border of the horizontal ramus is markedly convex : and the ramus itself diminishes 
rapidly in vertical height towards, and at the symphysis,^ indicating that the form of 
this part was very similar to that prevailing in the existing Javan rhinoceros, and 
that the canines^ were of moderate size ; — an inference rendered certain by the size 
of their alveoli in the specimen in which these are preserved. In the specimen 
figured in the woodcut the crown of m. 2 has been hammered off ; while in. 3 is only 
partially protruded. 
Upjjer milk-molars . — In figure 6 of plate I. there are represented the first and second 
right upper milk-molars of a rhinoceros from Gandoi, which may in all probability 
be referred to the present species. These teeth are of considerable importance in 
confirming the conclusions already arrived at as to the distinctness of the latter, 
since four other different types of upper milk-molars have been already described 
and referred to the four other Siwalik rhinoceroses.^ The present specimens may be 
at once compared with the others, without preliminary description. In J?. jpalcBindicus^ 
mm. 1 is more squared, and the anterior collis {a) is not distinctly developed : mm. 2 
has no obstruction at the entrance to the median valley ; and the extremity of the 
latter is cut off as an isolated fossette, which is not the case with the present 
specimen : minor differences will be detected by a comparison of the figures. In 
JS. sivalensis^ the external surface of mm. 2 is more convex, and wants the distinct 
costa which occurs opposite the median valley in mm. 2 of the present specimen® : 
the tooth which is probably mm. 1 of E. sivalensis^ has a square crown, without any 
anterior prolongation. To mm. 2 of U. platyrhinus^ the corresponding tooth of the 
present specimen has no resemblance. In Aceralherimn 'perimens^ mm. 2 has a squarer 
crown, with the two colies shaped more like those of the succeeding teeth : the 
median costa is also more strongly developed. 
In figure 1 of plate II. there is represented the unworn germ of a right upper 
molar of a rhinoceros from Gandoi, which may possibly be the last milk-molar of 
the present species. It has lost the enamel of the anterior surface, and the first 
costa. The buttress was apparently more developed than in the true molars, giving 
the tooth a great resemblance to the molar of R. sivalensis^ var. gajensis ; from which 
it is, however, distinguished by its higher crown. The tooth has also a strong 
resemblance to mm. 4 of R. sivalensis, but has likewise a higher crown. If the serial 
and specific determination of this tooth be correct it indicates a resemblance between 
the milk-teeth of the typical R. sivalensis, of var. gajensis, and the present species, 
not existing in the true molars. 
1 Seen even in the specimen represented in plate II., fig. 5, which is associated with the upper teeth of fig. 4. 
2 Since it is now pretty clearly proved that the outer mandibular cutting teeth of the rhinoceroses are canines, and not 
incisors, they will in future he so termed. 
3 Even if any of these milk -molars be wrongly assigned, this wiU not interfere with the inference drawn from the present 
specimens as to the existence of a fifth Siwalik rhinoceros. 
4 Supra., vol. II., pi. VII., fig. 3. 5 Ibid., pi. VI., fig. 2. 6 Not clearly shown in the figm-e. 
7 Supra., vol. II., p. 34. 8 Ibid., pi. VII., fig. 4. 9 Ibid., pi. III., fig. 2 : vol. I., pi. V., fig. 4. 
