RESUME OF URINOGENITAL SYSTEM. 



515 



DIAGRAM OF THE ARRANGEMENT OF THE URINOGENITAL ORGANS IN AN ADULT 

 FEMALE ELASMOBRANCH. 



m. d, Miillerian duct; w. d. Wolffian duct; s. t. 

 them are represented with openings into the body-cavity; 

 segmental tubes ; ov. ovary. 



glandular tubuli ; five of 

 d. duct of the posterior 



In the woodcuts, figs. 8 and 9, are diagrammatically repre- 

 sented the chief constituents of the adult urinogenital organs in 

 the two sexes. In the adult female, g. 8, there are present the 

 following parts : 



(1) The oviduct or Miillerian duct (m.cT) split off from the 

 segmental duct of the kidneys. Each oviduct opens at its an- 

 terior extremity into the body-cavity, and behind the two ovi- 

 ducts have independent communications with the general cloaca. 



(2) The Wolffian ducts (w. d}, the other product of the seg- 

 mental ducts of the kidneys. They end in front by becoming 

 continuous with the tubulus of the anterior segment of the 

 Wolffian body on each side, and unite behind to open by a com- 

 mon papilla into the cloaca. The Wolffian duct receives the 

 secretion of the anterior part of the primitive kidney which 

 forms the Wolffian body. 



(3) The ureter (d) which carries off the secretion of the 

 kidney proper. It is represented in my diagram in its most 

 rare and differentiated condition as a single duct. 



(4) The glandular tubuli (s. t}, some of which retain their 

 original openings into the body-cavity, and others are without 

 them. They are divided into two groups, an anterior forming 



