ORGANS OF THE SUMATRAN RHINOCEROS. 109 
being longer in proportion to its depth, and its apical expansion narrower across in 
proportion to its height (finch to 14), with its margins, moreover, somewhat crinkled. © 
It is, in conclusion, interesting to observe that the distinctness of the two genera 
Rhinoceros and Ceratorhinus, as shown by other characters—external, cranial, and vis- 
ceral—is confirmed by these differences in the sexual organs. 
DESCRIPTION OF THE PLATE. 
PLATE XX. 
Fig. 1. Glans penis of Ceratorhinus sumatrensis, of about the natural size, viewed 
from above, with the lobes artificially extended, to show better their form 
and attachment. 
Fig. 2. The same, viewed from the side. 
Fig. 5. Outline of glans penis of Rhinoceros indicus, after Owen (Trans. Zool. Soc. iv. 
pl. ix. fig. 6). 
