THE ACCESSORY REPRODUCTIVE ORGANS 257 



^/~^fe*P 



a 



-W 



b 



C 



d 







FIG. 69. Part of transverse section through penis of monkey. 



, Erectile tissue ; />, urethra ; <, artery ; </, nerve ; e, Pacinian body ; 

 /, fold of epithelium ; y, surface epithelium. 



particularly large in the walrus. In the Cetacea the penis is often 

 of enormous size (six feet in length in some species), and terminates 

 in a point, but is otherwise normal. It can be withdrawn into the 

 9 



