6(52 



ANATOMY OF VERTEBRATES. 



520 



on each side finally terminates by a minute pore 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 con- 

 tracted, by the thickness of the cellulo-glan- 

 dular parietes to which the enlargement of 

 the duct is due. The vesicular glands, ib. 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, ib. p, resem- 

 bles that of many Rodents, being composed 

 of an aggregate of long slender crecal tubes 

 with glandular walls converging to the ducts 

 of the vesiculae and vasa deferentia, and 

 opening by numerous minute apertures on 

 the verumontanum. The breadth of the 

 prostate is six inches ; its antero-posterior 

 extent four inches : it does not quite sur- 

 round the beginning of the urethra, but is 

 closely applied to the back and sides of that 

 canal. The muscular part of the urethra 

 extends about three inches from the prostate 

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

 are situated two large subcompressed oval Cowperian glands, ib. 

 c, c. Each of these measures three inches and 

 a half by two inches and a half. The great 

 plexus of veins above the dorsum penis, near its 

 root, is enveloped in a mass of elastic tissue, 

 like the f dartos' of the human scrotum. 



The fleshy part of the ' levatores penis,' fig. 

 520, /, /, measures fourteen inches in length, 

 five inches across their basal origin, and be- 

 tween one and two inches in thickness. Their 

 oblique origin is extended over the space of 

 one foot from the en to-pelvic part of the pubis 

 down to the ischium. The tendinous part 

 of the muscle commences where the pubic portion joins the 

 ischial one at the inner and under border of the fleshy part: 



Penis and muscles, 

 Rhinoceros, 



521 



Apex of glans, penis, 

 Rhinoceros. 



