406 UNGULATA 
plate, and a strongly-marked buttress at the antero-external angle 
(not distinctly shown in the figure). The visceral anatomy, accord- 
ing to Beddard,! does not differ materially from that of the next 
species. In respect to its dentition and anatomical characters 
this species is indeed more nearly allied to the Sumatran than to 
the Indian Rhinoceros; and therehy indicates that the division of 
the existing Rhinoceroses into separate genera is not advisable. 
Fic. 170.—Javan Rhinoceros (Rhinoceros sondaicus). 
Ceratorhine Group.—The adults with a moderate-sized compressed 
incisor above, and a laterally placed, pointed, procumbent canine 
below, which is sometimes lost in old animals. Nasal bones narrow 
and pointed anteriorly. A well-developed nasal, and a small frontal 
horn separated by an interval. The skin thrown into folds, but 
these not so strongly marked as in the former group. The 
smallest living member of the family, the Sumatran Rhinoceros, R. 
sumatrensis, Cuvier, now represents this group. Its geographical 
range is nearly the same as that of the Javan species, though not 
extending into Bengal; but it has been found in Assam, Chittagong, 
Burma, the Malay Peninsula, Sumatra, and Borneo. So far as 
can be determined during the life of the type specimen, it appears 
that the hairy form from Chittagong, described as R. Jusiotis, is only 
a variety of this species.2 The molar teeth of the Sumatran Rhino- 
ceros are almost indistinguishable from those of the Javan species, 
1 Trans. Zool. Soc. vol. xii.; see also Proc. Zool, Soc. 1889, p. 9. 
? See Beddard and Treves, Proc. Zool. Soc. 1889, Pp. 9 
