THE GENERATIVE ORGANS. 



293 



varies greatly in its form, and lies retracted in a reduplication 

 of the skin (foreskin or prepuce} which is richly glandular (gl. 

 Tysoniance). 



Female sexual organs. The ovaries (fig. 678) are unsymmetrical 

 only in the Monotremata, in consequence of the reduction of the right 

 ovary. In all other cases they are equally developed on either side ; 

 they are placed in folds of the peritoneum, close to the funnel-shaped 

 dilated mouths of the oviducts, by which they are sometimes corn- 



Fro. 678. Female generative organs. , of Ornithorhyncus (after Owen) ; b, of Viverra 

 genetta; c, of Cercopithecus nemestrinus; Ov, Ovary ; T, Oviduct ; U, "Uterus ; V, Vagina ; 

 .H", Urinary bladder ; Ur, Ureter j M, Mouth of Uterus ; F, opening of Ureter ; 8, 

 urogenital Sinus ; Kl, Cloaca ; D, Intestine. A style is passed through the opening 

 of the latter into the Cloaca. 



pletely surrounded. The oviduct is divided into the Fallopian tube, 

 which is always paired and begins with a free ostium ; the dilated 

 sometimes paired, more frequently unpaired, middle portion the 

 uterus ; and the terminal part, or vagina, which is unpaired, except 

 in Marsupials, and opens behind the opening of the urethra into the 

 short urogenital sinus, or vestibule. In the Monotremata the two 

 tubular uteri open, without forming a vagina, on papilliform 

 prominences into the urogenital sinus, which is still connected with 

 the cloaca (fig. 678 a). 



According to the different degrees of duplicity of the uterus 



