MALE ORGANS OF PERISSODACTYLA. 



661 



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- 

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

 which is obtuse and rounded. Besides the ordinary muscles, 



mf 



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 alons; a sheath of the thick sclerous wall 



' O 



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 ' caput epididymidis,' along the whole longitudinal axis 

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



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

 ternal tunic, forming the compartments in which the lobes of 

 ao-oreirated ( tubuli seminiferi ' are lodged. The branches of the 



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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; 011 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- 



J5 



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



