‘ 
412. MR. G. BUSK ON FOSSIL REMAINS FROM BORNEO. [June 10, 
the posterior, are somewhat slender, and the latteris curved forwards 
towards the summit. There is a very minute tubercle at the bottom 
of the fissnre. The crochet (ec, fig. 4, p. 413) projects directly for- 
wards, and rises from the hinder column at a very open angle. There 
is no trace of a crista. 
Posterior surface. 
The question now is to determine the species, recent or extinct, to 
which these teeth belong. Although the evidence afforded by a 
single tooth, and that in a not fully developed condition, cannot be 
regarded as very ample or sufficient in many cases, still I think in 
the present it may be safely relied upon. 
Without entering into other details, I may say that the dimen- 
sions of the tooth alone exclude from consideration, among existing 
species, R. indicus, R. bicornis, and R. simus, leaving of known 
species only &. sondaicus and R. sumatranus, and, amongst quater- 
