INDIAN TERTIARY AND POST-TERTIARY YERTEBRATA. 
SIWALIK RHINOCEROTIDJL 
By R. LYDEKKER, B.A., F.Z.S., 
GEOLOGICAL SURVEY OR INDIA. 
[ WITH PLATES I to X. ] 
Order: UNGULATA, Div. PEBJSSODACTYLA, 
Pamily : R El NO CEE 0 TIE El. 
Introductory. — Although in the first volume of this series of the “ Palgeonto- 
logia Indica, ” a considerable number of teeth and other remains of various species 
of rhinoceros, from the tertiaries and post-tertiaries of India and Burma, have been 
described and figured by Mr. Poote and myself, yet in many cases those remains 
by no means fully illustrated the dentition ' and full affinities of the various species, 
while, from their incompleteness and isolated character, they have in not a few 
instances led to erroneous inferences. The comparatively recent ‘acquisition of a 
much larger series of fossil remains of this family by the Indian Museum from 
Siwalik strata has now enabled me to give a much fuller account of the dentition 
of most of the Siwalik species, and to correct such previous determinations as sub- 
sequently-acquired information has shown to be erroneous. No additional remains 
of the pleistocene species have been acquired, and it will, therefore, be unnecessary 
to refer to them at length in this memoir. 
Number of species of Siwalik rhinoceroses. — In the “ Pauna Antiqua Siva- 
lensis,” three species of fossil Indian true rhinoceroses, from the plio-miocene or 
Siwaliks of India, were named, upon the evidence of a fairly complete series of 
remains ; while a fourth species, named on very fragmentary remains, was provision- 
ally referred 1o the genus Acerotherium , — a determination which has subsequently 
turned out to be correct. The above-mentioned four species have been respectively 
named E. palceindicus , R. platyrhinus, R. sivalensis, and A.perimense. In the first 
volume of the present work two additional species were described from the evidence * 
