202 



MAMMALIA. 



cles), open close together into the urethra. At this point open the 

 ducts of the prostates, which differ much in form, and are often 

 divided into several groups of glands. Further down a second pair 

 of glands, known as Cowper's glands, opens into the urethra. Re- 

 mains of the Miillerian ducts, which in the female are used as the 



oviducts, frequently persist 

 between the openings of the 

 vasa deferentia. They are 

 called the organ of Welber 

 (icterus masculinus), and in 

 the so-called Hermaphrodites 

 their parts are much en- 

 larged, and may be differen- 

 tiated in the manner peculiar 

 to the female sex. In all 

 cases the end of the urethra, 

 which functions as a uro- 

 genital canal, is in connec- 

 tion with external copulatory 

 organs : these always have 

 the form of an erectile 

 penis, which, in the Mono- 

 tremata, is concealed in a 

 pouch in the cloaca. The 

 penis is supported by cavern- 

 ous erectile bodies, which in 

 the Monotremata are con- 

 fined to paired corpora 

 cavernosa urethras ; but in all 

 other Mammalia there are, 



FIG. 677. Urinary and sexual organs of Cricetus j n addition to the COrpUS 



TO /a<ms (after Gegenbaur). .K, Kidney ; U, Ureter; , , 



//.Urinary bladder ; T, Testis ; .F, Funiculus sper- CavemOSUm uret/irce (C. Spon- 



maticus (Spermatic cord); N, Epididymis; Vd, q l osum \ which is unpaired 



Vas deferens ; V, Vesicular seminales ; Pr, Pro- y ' 



state ; % Urogemtal sinus (Urethra) ; Gc, Cowper's and SUITOUnds the urethra, 



glands ; Gt, Tyson's glands ; Cp, Corpora caver- twQ upper Corp0 ra cavernosa 

 nosa penis ; C, Corpus cavernosum urethra? ; E, 



Glaus penis ; PP, Prepuce. penis, which are attached to 



the ischium, and only rarely fuse with one another. A cartilaginous, 

 or bony support, the so-called os penis (Carnivora, Rodent*), may 

 also be developed, especially frequently in the glans, which is 

 formed by the corpus cavernosum urethra (fig. 677). The glans, 

 which is bifid only in exceptional cases (Monotremata, Marsupials), 



