344 THE UlUNO-GENITAL SYSTEM, THE ADL'ENALS, ETC. 



Fig. 224. 



B. The female reproductive organs. 



The position of these organs has ah-eady been given (p. $^5)- 



I. The ovaries. 



a. General description. 



Each sac-Hke ovary (Fig-. 

 224) is subdivided by thin- 

 walled septa into numerous 

 complete chambers, to the 

 inner walls of which the 

 ova are attached. The 

 walls of adjacent sacs are 

 intimately attached to each 

 other, and the subdivision 

 corresponds with the ex- 

 ternal lobulated appearance 

 of the organ. According 

 to Spengel the number of 

 lobules is about fifteen 

 (Rathke nine to thirteen, 

 Brandt nine). Whether 

 this segmentation of the 

 ovary corresponds with the 

 segmentation of the body 

 has not been determined 

 (Spengel). No part corre- 

 sponding with Bidder's 

 organ has been found in 

 J^aua esculenta. 



During the breeding 

 season the ovaries undergo 

 an extraordinary increase in 

 size so as to occupy the 

 greater part of the body- 

 cavity and to displace the 

 other viscera. The ovaries 

 are entirely surrounded by 

 peritoneum. 



b. Minute structure. [The layer of peritoneum covering the 

 ovary possesses cilia (Thiry), the ciliated cells being arranged in 

 isolated patches (Schweigger-Seidel,AValdeyer) on the ventral surface 

 of the organ, and on the mesovarium ; these patches are some- 



The feiH.ile reproductive organs ; the ovary of the right 

 side has been removed. 



y Kidney. 



0. 7'. Opening of the oviduct into pieuro-iJeritoneal cavity. 



Ov Oviduct. 



Ova Ovary. 



P Opening of oviduct into the cloaca. 



jS, .51 Openings of the ureters. 



Vt Dilated liinder portion of the oviduct. 



t Groove in which ureters lie. 



* Fold in groove separating the oiieninL's of the ureters. 



