28 INDIAN TERTIARY AND POST-TERTIARY VERTEBRATA. 
river, and it therefore appears that the Burmese form, which seems to have belonged 
to a smaller race, was isolated from the other representatives of the species. 
Genus II : RHINOCEROS, Linne. 
Either one or two horns, or rudiments of such, always present j limbs tridactv- 
late. 
Species I. Rhinoceros sivalensis, Ealconer and Cautley 
Synonyms ( ? ) Rhinoceros angustirictus, Talc, and Caut. 
„ EOSS1LIS INDICUS, Baker and Durand. 
Zalabis sivalensis, Cope. 
Previous notices . — The earliest description of a fossil rhinoceros from the 
Siwaliks is one published by Messrs. Baker and Durand in 1836. 1 In that paper 
there is described a complete skull, various teeth, and limb-bones, — all illustrated by 
figures. The authors considered that their skull indicated an animal allied to the 
living JR. indicus, and accordingly gave it the name of JR. indicus fossilis. Erom 
their figures and descriptions it is evident that their skull belongs to the species 
which was subsequently named JR. sivalensis by Ealconer and Cautley. Messrs. Baker 
and Durand did not apparently closely examine the molars of their specimen, or 
they would have seen that it was more nearly allied to R. javanicus than to R. 
indicus. Messrs. Baker and Durand’s paper is copied, without the illustrations, in 
the “ Palaeontological Memoirs ” of Dr. Ealconer. 2 The teeth of which figures are 
given in Messrs. Baker and Durand’s paper apparently belong, as was suggested by 
the authors, to more than one species. The present name of the species appears to 
have been first applied to the specimens figured in the “ Fauna Antiqua Sivalensis,” 
which afford ample means of recognising the species. In Royle’s “ Illustrations of 
the Botany, &c., of the Himalaya Mountains,” published in 1839, there appears a 
figure 3 of the upper jaw and dentition of a rhinoceros from the Siwaliks, which was 
subsequently copied in the “ Eauna Antiqua Sivalensis,” 4 where it is assigned to the 
present species. In the “ Palaeontological Memoirs” 5 a very cursory notice of this 
and the other Siwalik species of the genus is given. In the course of that notice 
the editor quotes a passage from the “ Odontography” 6 of Professor Owen in refer- 
ence to one of the Siwalik species of rhinoceros, and adds a comment of his own which 
appears to have been the source of many subsequent errors. Professor Owen’s 
statement is as follows : “ In one of the extinct species of rhinoceros from the 
1 J. A. S. B. vol. V, p. 486. In the previous volume of the same journal (vol. IV, p. 706, 1835), among a [list of 
Siwalik mammals given by Falconer and Cautley, occurs the name Rhinoceros angustirictus ; it is probable that this 
name was originally applied to the present species, hut subsequently replaced by sivalensis. 
2 Vol. I, p. 158 3 PI. VI, figs. 3, 6. 4 PI. LXXIV, fig. 5. 5 Loc . cit., p. 157. 6 Page 589. 
