688 



THE GENERATIVE ORGANS. 



The body of the testis is seen at this period, in sections, in 

 the anterior part of the fifth abdominal segment. It consists 

 of small closely-packed cells which have a radial arrangement, 

 surrounded by a distinctly differentiated capsule of mesoblastic 

 cells. 



The Ovary is smaller than the testis on the third day ; it is 

 pyriform, and measures "2 mm. in its long diameter. The 

 genital cord is continuous with its posterior extremity or apex. 

 The genital cord of the ovary is much more slender than that 





/feiW:J'?S 



5%;SM|SiJ: 



FlG. 99. A section through the ovary and genital cord, from a pupa about three days 

 old. f, genital cord ; i, mesoblastic stroma of the ovary ; 8, neck of the ovary ; 



y, yelk-stocks. 



of the testis, it does not join its fellow, and has a length of 

 about 2' mm.; it terminates by joining a minute vesicular in- 

 vagi nation of the hypodermis on the ventral surface of the 

 abdomen immediately in front of the position of the future 

 anus. At this period the genital cord is a solid string of small 

 cells similar to those which form the ajx-x of the ovary, sur- 

 rounded by a very thin, apparently structureless, sheath con- 

 tinuous with the peritoneal coat of the ovary. 



In sections, the ovary is seen to consist of a solid cellular 



