172 GENERATIVE ORGANS OF THE SUMATRAN RHINOCEROS. 



artificially, so as to show better their extent and attached bases. The 

 total length of the glans, to the reflection of the prepuce, was 7 inches, 

 the trumpet-like terminal part being 1 inch long, and 1 inch trans- 

 versely. The lobes of the glans measured 2| inches long by 1J inch 

 across. 



In R. indiwu, according to Prof. Owen (I. c. p. 51), " on each side of 

 the base of the glans, and. rather towards its under part, there is a 

 longitudinal thick oblong ridge or lobe, 3^ inches in length, and 8 lines 

 in basal thickness ; the thick rounded free border of each lobe inclines 

 downwards." Prof. Owen's figure is reproduced in outline, of the 

 original size, in fig. 3, to show the differences thus indicated. By the 

 kindness of Prof. Mower I have been enabled to examine the penis of 

 an Indian Rhinoceros preserved in the stores of the College of Surgeons, 

 and which is probably the same specimen as that dissected and described 

 by Prof. Owen, with whose description and figures it closely corresponds. 

 The lobes, however, seem to me to be (as also indicated in his figures) 

 rather on the upper than on the under part of the penis, as they lie, in fact, 

 on each side of the dorsum a little removed from the middle line, as also 

 is the case in Ceratorhinus. They are about 1| inch in height at the 

 centre, diminishing towards each end till they become undistinguishable 

 from the rest of the glans. Ceratorhinus therefore differs from restricted 

 Rhinoceros in the greater size and development of the lobes, which have 

 now ceased to be mere elevations or ridges attached throughout their 

 length to the body of the glans, but have become freely projecting lobes 

 attached only by their bases *. In R. indicus, too, the terminal part of 

 - S ' 1 QQ 81 ' the glans is more slender, being longer in proportion to its depth, and 

 its apical expansion narrower across in proportion to its height (J inch 

 to 1-J), 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 visceral is confirmed by these differences in the 

 sexual organs. 



* I may mention that Prof. Flower also found for me in the stores of the College of 

 Surgeons a detached glans penis of a Rhinoceros exactly like that now described. Its 

 history is somewhat uncertain ; but it was probably sent over, along with other viscera 

 of animals, by Sir Stamford Raffles when Governor of Java. There can be no doubt 

 that it belongs to a species of Ceratorhinus. 



