EXCRETORY ORGA XS. 



r>7r> 



Wolffian body, but before opening into the tubuli of this body they 

 unite into a canal known as the longitudinal canal of the Wolffian body 

 (l.c), from Avhich pass off ducts equal in number to the vasa efferentia, 

 each of which normally ends in a Malpighian corpuscle. From the 

 Malpighian corpuscles so connected there spring the convoluted tubuli, 

 forming the generative segments of the Wolffian body, along which 

 the semen is conveyed to the Wolffian duct (v.d). The Wolffian duct 

 itself becomes much contorted and acts as vas deferens. 



s.f 



FIG. 392. DIAGRAM OF THE ARRANGEMENT OF THE URINOGENITAL ORGANS 



IN AN ADULT FEMALE ELASMOBRANCH. 



?n.fZ. Miilleriau duct; iv.il. Wolffian duct; x.t. segmental tubes; five of them are 

 represented with openings into the body cavity, the posterior segmental tubes form 

 the niesonephros ; ov. ovary. 



Figs. 3.92 and 393 are diagrammatic representations of the 

 chief constituents of the adult urinogenital organs in the two 

 sexes. In the adult female (fig. 392), there are present the following 

 parts : 



(1) The oviduct or Mullerian duct (m.d) split off from the 

 segmental duct of the kidneys. Each oviduct opens at its anterior 

 extremity into the body-cavity, and behind the two oviducts have 

 independent communications with the general cloaca. 



s r 



FIG. 393. DIAGRAM OF THE ARRANGEMENT OF THE UKINOGENITAL ORGANS 



IN AN ADULT MALE ELASMOBRANCH. 



m.d. rudiment of Mullerian duct; w.d. Wolffian duct, marked vd in front and 

 serving as vas deferens; s.t. segmental tubes; two of them are represented with open- 

 ings into the body cavity; d. ureter; t. testis ; nt. canal at the base of the testis; 

 VE. vasa efferentia; Ic. longitudinal canal of the Wolffian body. 



