156 



tubes. It is lined with a single layer of small 

 cubical epithelium. After passing out of the 

 ovary, a considerable number of striated muscular 

 fibres are arranged in a loose network around it, 

 and pass from it to surrounding structures. There 

 are also muscular fibres in the ovary itself in con- 

 nexion with the ovarian tube and egg-follicles. 



The spermatheca consists of a chitinous sac, 

 with large cells lying externally. These resemble 

 the cells of the cuticle, and contain droplets. 

 They do not cover the whole of the surface of the 

 spermatheca. The contents of the spermatheca 

 in the fertilized insect consist of a mass of sper- 

 matozoa, which, in the fresh state, may be seen 

 revolving with great rapidity within the sac. The 

 spermatozoa have a narrow, slightly-curved head 

 and a long tail. The duct of the spermatheca is 

 narrow and thick- walled, and contains muscular 

 fibres. Certain large cells lie in connexion with 

 the duct externally. The mucus gland contains 

 cells filled with secretion. There are small nuclei 

 in connexion with the intra-acinar duct (Fig. 39). 



