MALE EEPRODUCTIVE SYSTEM. 357 



cavernosa. The free end of the penis is soft, and 

 obliquely truncated ; and is invested by a loose 

 sheath of skin, the prepuce. The external aper- 

 ture of the urethra is a slit-like opening on its 

 posterior surface. 



g. The uterus masculinus is a large median sac, 

 slightly bilobed in front, attached to the dorsal 

 surface of the urino-genital canal, into which it 

 opens, and extending forwards along the dorsal 

 surface of the bladder to about the middle of its 

 length. 



h. The posterior ends of the vasa deferentia are 

 slightly dilated, and run back, side by side, along 

 the dorsal surface of the neck of the bladder, 

 between it and the uterus masculinus. They 

 open separately into the ventral wall of the uterus 

 masculinus, just in front of its communication 

 with the urino-genital canal, and opposite the 

 hinder end of the obturator foramen. 



Slit tip the uterus masciiliniis along one side luith scissors. 

 Note the large aperture leading into the urino-genital canal, 

 and, just in front of this, the small paired openings of the 

 vasa deferentia. 



i. The prostate is a series of glandular masses, grouped 

 around the dorsal surface and sides of the uterus 

 masculinus and vasa deferentia, and opening by 

 short ducts into the urino-genital canal. There 

 are four or five lobes, the largest of which is an 

 anterior lobe, closely applied to the dorsal wall 

 of the uterus masculinus, and bilobed in front : 

 behind this is a smaller posterior lobe, sometimes 

 divided into two ; a pair of still smaller lateral 

 lobes lie in the angle between the vasa deferentia 

 and the uterus masculinus. 



k. Cowper's glands are a pair of glandular bodies, 

 varying greatly in size, and placed on the dor- 



