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VIII. On the Male Generative Organs of the Sumatran Bhinoceros (Ceratorhinus suma- 

 trensis). By W. A. Forbes, B.A., F.L.S., Scholar of St. John's College, Cambridge, 

 Prosector to the Society^. 



Received February 25th, read March 16th, 1880. 



[Plate XX.] 



On two occasions the late Pi'of. Garrod had opportunities of dissecting the Sumatran 

 two-horned Rhinoceros ; and his notes on their anatomy will be found duly recorded in 

 the Society's publications 2. Both his specimens were females. 



On March 20, 1879, the Society received on approval a fully adult male of this 

 animal, being, I believe, the first individual of that sex brought alive to Europe. Un- 

 fortunately it died on the 5th of April following, the post-mortem examination showing 

 evidence of dropsy, as well as of tubercle in the lungs and spleen. The skin and 

 skeleton of this specimen are now in the British Museum. 



Prof. Owen, in his account of the anatomy of Bhinoceros indicus (Trans. Zool. Soc. 

 iv. pp. 31-58), has described and figured the male organs of that species ; and the pre- 

 sent account will fill up the corresponding blank that has as yet existed as regards 

 these parts in Ceratorhinus sumatrensis. 



As was to be expected, the two genera closely conform with each other in all main 

 points, with some considerable differences in matters of detail. 



As in B. indicus, there was no scrotum ; each testis measured 4^ inches long by 2 

 broad at the widest part. The epididymis was of the same length as the testis. 



The vasa deferentia were 29^ inches long by ^ inch broad ; unlike these ducts in 

 the Indian species, they were not dilated terminally. The vesiculae seminales resembled 

 in shape those described by Owen : they were Ih inches long, and 1 inch across at the 

 broadest part. The right vesicula had two, the left four, narrow ducts, l|^-2 inches 

 long, which joined the vasa deferentia just before these entered the urethra. The 

 verumontanum is short and rounded, \ inch long and 1 inch broad. The openings of 

 the ejaculatory ducts were very minute ; a larger pore, which was the only represen- 

 tative of a vesicula prostatica, lay close above. 



' Prof. Garrod had the drawings which accompany this paper made by Mr. Smit from the animal whilst 

 still fresh, with the object of laying some notes on the subject before the Society. Unfortunately I have been 

 unable to find any such amongst his numerous MS. papers. He also requested me to make notes and measure- 

 ments of the male organs for him with the like object; and from these sources I have drawn up the present 

 paper. The glans penis is now preserved in the College of Surgeons. 



= Proc. Zool. Soc. 18 73, p. 92, and Trans. Zool. Soc. x. p. 411 (1878). 



VOL. XI. — PABT IV. No. 1. — April, 1881. t 



