SIWALIK BHINOCEROTIDAL 
figure of tlie penultimate upper molar figured in tlie latter plate has been copied in 
the first volume of this work, 1 where a short notice of the species is also given. In 
the preface to the same volume 2 it has been shown that the attempted identification 
of this species with R. sumatrensis ' by the late Professor Brandt is founded upon 
false premises. 
Cranium . — Besides the imperfect specimens of the cranium of this species 
figured in the “ Fauna Antiqua Sivalensis,” reference is made by Dr. Falconer in 
the note already cited to a nearly complete cranium, stated to have been obtained 
by Colonel Baker, the collector of so many Siwalik fossils, and now in the British 
Museum. This skull appears never to have been fully described or figured in a 
scientific work, 3 and I have accordingly given a profile view of it in this volume 
(pi. IX., fig. 2) in order to show its general form ; this figure has been taken from 
a cast in the collection of the Indian Museum. 
An examination of this cast shows that the skull is perfect, with the exception 
of the extremities of the premaxillae, and that it belonged to a two-horned species, 
the rough surfaces for the attachment of the bases of two horns being most distinct- 
ly visible ; the anterior horn must have been of very large size. The nasals are of great 
width and thickness, whence the specific name; this character is well shown in 
the specimen of which an upper view is given in figure 1 of plate LXXII of the 
“ Fauna Antiqua Sivalensis.” The supra-occipital region is produced into a high 
crest. The post-tympanic and the post-glenoidal processes of the squamosal are 
united below the external auditory meatus,—* a character showing that the species 
has no direct affinity with R. sumatrensis. The premaxillae are well developed, and 
perhaps carried a pair of incisors, though, if the mandible provisionally referred to 
this species really belongs to it, it may be doubted whether these teeth, if present, 
were persistent. 4 
In the following table some of the principal measurements of this skull are 
given in the first column, while in the second column are given some of the correspond- 
ing dimensions of the two imperfect specimens figured by Falconer and Cautley : — 
Length from inferior border of foramen magnum to tip of premaxillse (broken) . 29'5 
Greatest width across zygomse 14'7 
Length of six molars 12’5 
Interval between outer surfaces of penultimate molars 8 - 4 
Height of occiput from inferior margin of foramen magnum .... 12’0 12 0 
Width of „ above . . . 8’6 8’4 
„ of „ below 13*3 13 2 * 
Height of foramen magnum 2 5 2 5 
Width of „ 2-1 2-0 
Interval between external angles of occipital condyles 6'0 5*3 
Extreme length of cranium, following curves of upper surface .... 33'0 
Greatest width at orbits 10’4 10'6 
Width of nasals 6'0 
PI. IV., fig. 4. s P. xi. 
1 This skull is figured on a small scale on page 28 of the “ Ward series of casts of Fossils.” Rochester, N. Y. 1866. 
It is stated in the above mentioned note of Dr. Falconer that this species certainly had an upper incisor ; no 
trace of such, however, is seen in the skull on which the note is based. 
