22 
MOLAR TEETH AND OTHER REMAINS OF MAMMALIA. 
the foramen magnum and the summit of the occipital crest of the specimens of the « 
above species figured in the “ Fauna Antiqua Sivalensis” is respectively 9 and 7‘7 
inches ; while that of our specimen is at least lOTO inches and perhaps rather more; 
the height of the occipital foramen in Falconers two species is 1'9 and 1*2 inches 
respectively; and the interval between the external angles of the condyles 4'8 
inches. These measurements are much smaller than those of the present specimen. 
The dimensions of the condyles of the Siwalik species are not given. 
The occiput of jR. palceindicus is further distinguished from the present speci- 
men by the great width of the parietals between the temporal fosse, — nowhere less 
than 3’4 inches ; further, the occiput of R. palceindiGus drawn in plate 74, fig. 
2(? of the “ Fauna Antiqua Sivalensis” differs from the present specimen not only 
by its much smaller size, but by the square form of the upper half of the occiput, 
and by the absence of the unusually deep lateral fossse, and the large median 
tubercle seen beneath the crest of the present specimen. 
Of B. sivalensis there is no figure of the occipital crest given in the " Fauna 
Antiqua Sivalensis ;” the parietals of B. sivalensis^ between the temporal fossse 
though in a much smaller specimen, are wider than in our specimen ; the relative 
size of the two is, however, a quite sufScient distinction. 
Retween our specimen and the occiput of Bhinoceros 'platyrhinus, which is 
the only one of the Siwalik species which approaches it in size, there are very wide 
and well-marked differences. An excellent figure of the occiput of B. platyrhinus 
is given in the “Fauna Antique Sivalensis” {plate 72, fig. 2). On comparing this 
with the figure of the present specimen, the two will he seen to differ greatly in the 
length of the vertical diameter ; this, however, cannot he relied upon, owing to the 
conjectural restoration of the present specimen. The condyle of this specimen, 
though broken, is slightly larger than that of B. platyrhinus^ and the breadth of the 
occiput is also rather larger. The occipital crest, however, at once distinguishes the 
two ; the superior border of this is broad and convex in B. iravadieus ; in B. platy- 
rhinus it is narrow and with a median excavation ; so that the surface of the 
parietals between the temporal fossse in the latter species, as is seen in the crest of 
Colonel Baker’s cranium, is concave, and placed considerably below the outer borders 
of the crest. In the present specimen this surface of the parietals is flat or slightly 
conven, and forms the highest part of the cranium. The narrowest part of the 
parietals in the Siwalik species is 3 '3 inches, while the narrowest part remaining in 
the present specimen is only 1’8 inches. The whole of the upper part of the occiput 
beneath the crest in B. platyrhinus is somewhat hollowed, but not deeply so, and 
with no prominent median projection ; entirely wanting the wide and deep hollows 
of the present specimen. 
The above description or comparison, although, from the state of the materials, 
necessarily incomplete and crude, serves nevertheless to confirm the conclusions 
previously arrived at from the study of the upper molar teeth as to the specific 
distinctness of the large fossil Bhinoceros of the valley of the Irawadi : it may he 
( 40 ) 
