IT2 



The Fly of Chironomus 



ovarian tube. The axis is not 



g9 



al~ 



Fiii. 80. — Abdominal cavity of female fly. 

 «?, alimentary canal, f/s, gluten-gland. The 

 ovary ana the paired spermathecae are also 

 seen. Dorsal surface to left, outlet below. 



Fifi. 8i. — Two ovarioles. i, optical section. 2, surface 

 view, fc, follicular epithelium, o, ovum. 



visibly hollow, but that 

 it is an actual oviduct 

 may be inferred from the 

 fact that all the eggs de- 

 veloped within the nu- 

 merous tubes escape in 

 a continuous egg-mass. 

 The whole collection of 

 ovarian tubes is enclosed 

 within a transparent 

 outer sheath, and consti- 

 tutes the ovary, a smooth, 

 sausage - shaped organ, 

 which unites behind with 

 its fellow. From the 

 point of junction of the 

 two ovaries a short, wide 

 oviduct or uterus passes 

 backwards, and is con- 

 tinued to the genital 

 outlet by the ectodermal 

 invaoination described 

 below. The two ovaries 

 are applied to each other 

 along almost their whole 

 length, but are not every- 

 where in contact, 

 for an unpaired 

 sac, the gluten- 

 gland (fig. 80). lies 

 between them. 

 The three to- 

 gether form a 

 large semi-trans- 

 parent mass, 



