488 



H. L. Wieman. 



the appearance of such a lobe in cross section. As the fol- 

 licle^ grow out their epithelial covering remains closely attached 

 to tlie outer surface, so that in the fully developed organ the fol- 

 licles are separated from each other by a layer of epithelial cells. 



Fig. 5 From larva about two days older than the preceding. A, section of the 

 distal end of the lobe; £, the degenerating cells; c, cysts of spermatocytes. X 265. 



In the early larval stages each lobe is filled with intermingled 

 germ and epithelial cells as is shown in fig. 3, A, B. The termi- 

 nal cap of epithelial cells (ex.) is comparable in appearance and 

 position to the expanded base of the terminal thread of the ovari- 

 ole of the mature female. A delicate thread-like process is seen 

 at t which reminds one of the terminal thread of the ovariole. 

 This appendage does not appear in later stages. The region of 

 the epithelial cap is continuous with the rest of the testis, which, to 



