THE REPRODUCTIVE ORGANS. 



97 



diverticulum of the vas deferens, near its posterior end, which 

 serves as a receptacle for the semen. 



■W.d M 



Pia. 27. — ^Dia^am exhibiting the relations of the female (the left-hand flffure, 9) and of the 

 male (the right-hand figure, i ) reproductive organs to the general plan (the middle fig- 

 m-e) of these organs in the higher Vertebrccta, 



CI, the cloaca ; R, the rectum ; Bl, the urinary bladder ; U, the ureter ; K, the kid- 

 ney ; TTh, the urethra ; (?, the genital gland, ovary, or testis ; W, the Wolffian body ; 

 Wd, the Wolffian duct; M, the Mtiilerian duct; Pst, prostate gland; Gp, Cowpor'a 

 gland ; Cajp, the corpus spongiosum ; (7c, the corpus cavernosum. 



In the female, V, the vagina; Ut, uterus; Fp, the Fallopian tube; Gt, Gaertner'fl 

 duct ; Pjo, the parovarium ; A, the anus ; Cc, C.s/>, the cUtoris. In the male. Cap, Oo, 

 the penis; K, the uterus masculinus; Fs, vesicula seminalis ; F^f, the vas deferens. 



If the Wolffian bodies, the genitalia, and the alimentary 

 canal of a vertebrate embryo, communicated with the exterior 

 by apertures having the same relative position as the organs 

 themselves, the anus would be in front and lowest, the Wolf- 

 fian apertures behind and highest, and the genital apertures 

 would lie bet\A!'een the two. But' the anal, genital, and uri- 

 nary apertures are found thus related only among certain 

 groups of fishes, such as the Teleostei. In all other Vertebrata 

 there is either a cloaca, or common chamber, into which the 

 rectum, genital, and urinary organs open ; or, the anus is a 

 5 



