MALE ORGANS OF PERISSODACTYLA, 



6G1 



the corpus spongiosum and urethra occupying the concavity. The 

 veins of the corpus cavernosum are surrounded by a soft tissue of 

 unstriped muscular fibre. The glans penis is elongate, sub- 

 cylindric at the base, becoming rather depressed at the end, 

 which is obtuse and rounded. Besides the ordinary muscles, 

 there are a pair of ' levatores penis,' arising from the pubis, send- 

 ing their tendons into the dorsum, where they coalesce above the 

 vena dorsalis, and run along a sheath of the thick sclerous wall 

 to the glans. 

 ^ § 377. In Perissodactyla. — In the Rhinoceros the testes are 

 inguinal, in close contact with the abdominal rings. The tunica 

 vaginalis communicates freely with the peritoneal cavity. The 

 testis is surrounded by a strong and thick ' tunica albuginea : ' the 

 ' corpus Highmorianum ' is continued in the form of a moderately- 

 thick white band, from the end where the efferent vessels pass out 

 to form the i caput epididymidis,' along the whole longitudinal axis 

 of the gland. From this band or centre of the cellular frame- 

 work of the gland, the septal layers diverge to all parts of the ex- 

 ternal tunic, forming the compartments in which the lobes of 

 aggregated i 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, 

 supported by the radiating septa, and 

 form a rich network upon the inner or 

 vascular layer of the capsule of the 

 testis. The vas deferens in the in- 

 guinal canal is surrounded by the ves- 

 sels and especially by the plexiform 

 veins of the spermatic chord; on en- 

 tering the abdomen it 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 termina- 

 tion of the ureter, fig. 519, m, the 

 vasa deferentia, ib. vd, descend straight, 

 slightly converging, to the middle of 

 the back part of the prostate, p : 

 they penetrate that gland, together 

 with the ducts of the vesicular glands, vs, lying to the inner 

 side of these ; and, communicating with them, the common duct 



519 



Accessory glands, male organs. 

 Rhinoceros. 



