PROF. OWEN ON THE ANATOMY OF THE INDIAN RHINOCEROS. 49 



The external inguinal position of the testis in close contact with the abdominal rings, 

 has already been described. The tunica vaginalis communicated freely with the peri- 

 toneal cavity. Each testis presented an oval figure, seven inches in length, four inches 

 and a half in breadth, and four inches in thickness. It is surrounded by a strong and 

 thick ' tunica albuginea.' On making a section into the gland along the line of attach- 

 ment of the epididymis, the ' corpus Highmorianum' was exposed, in the form of a 

 moderately thick white band, continued from the end of the gland where the efferent 

 vessels pass out to form the ' caput epididymidis,' along the whole longitudinal axis of 

 the gland. From this almost ligamentous band or centre of the cellular framework of 

 the gland, the septal layers diverge to all parts of the external tunic of the testicle, 

 forming the compartments in which the lobes of aggregated ' tubuli seminiferi' are 

 lodged. The branches of the spermatic artery, on penetrating the tunica albuginea, 

 pass directly to the corpus Highmorianum, and their ramifications diverge thence, sup- 

 ported by the radiating septa, and form a rich network upon the inner or vascular layer 

 of the capsule of the testis. 



The vas deferens enters the inguinal canal surrounded by the vessels and especially 

 by the plexiform veins of the spermatic chord, and on entering the abdomen is received 

 in a peritoneal fold and is conducted to the side and then to the back part of the urinary 

 bladder, passing between the bladder and the ureter : having got to the inner side of 

 the termination of the ureter, the vasa deferentia (PI. XVI. tig. 1 , vd, vd) descend straight, 

 slightly converging, to the middle of the back part of the prostate : they penetrate that 

 gland, together with the ducts of the vesiculcc seminales, lying to the inner side of these ; 

 and, communicating with them, the common duct on each side finally terminates by a 

 minute pore (PI. XVII. fig. 4) upon the crucial verumontanum. The vasa deferentia are 

 thickened to about thrice their ordinary diameter in the last three inches of their course ; 

 but their canal or area is not proportionally dilated ; it is, on the contrary, rather 

 contracted, by the thickness of the cellulo-glandular parietes to which the enlargement 

 of the duct is due. 



The vesicular glands or ' vesiculse seminales ' (PI. XVI. fig. 1 , vs, vs) present an elongate 

 subcompressed pyriform shape, eight inches in length, and three inches and a half across 

 the broadest part of the fundus. They have a lobulated exterior, and a structure very 

 similar to that of the same bodies in Man. 



The prostate (76. pr, pr) is much less compact than in Man and more resembles that 

 of many Rodents, being composed of an aggregate of long slender csecal tubes with glan- 

 dular walls, converging to the ducts of the vesiculae and vasa deferentia, and opening by 

 numerous minute apertures on the verumontanum (PI. XVII. fig. 4). The breadth of the 

 prostate is six inches ; its antero-posterior extent four inches : it does not quite surround 

 the beginning of the urethra, but is closely applied to the back and sides of that canal. 



The muscular or membranous part of the urethra, m, extends about three inches from 

 the prostate before it joins the bulbous and cavernous portions, close to which are 



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