JOURNAL OF ENTOMOLOGY AND ZOOLOGY 147 



between the ova around the edge of the follicle to form a sort 

 of lining layer. These were probably undifferentiated ova and 

 nurse cells. In the spermatic follicles columns of spermatogonia 

 were usually found in the upper part and bunches of sper- 

 matozoa in the lower. Between these are columns showing 

 several different stages. From the hermaphroditic gland ex- 

 tends a long slender duct to the ampulla. In all the specimens 

 examined it was found packed full of spermatozoa. In the dis- 

 tended condition it is a large, jiear-sliaped sac, with a wall 10 

 microns thick. There is no epithelial lining la.yer, apparently. 



From the ampulla extends a short, ciliated duct. It soon 

 divides into two jiarts, the male duct, which is very small and 

 lined with short cilia, and the larger female duct, lined with 

 very long, strong cilia. This strongly ciliated duct is rather 

 short and opens into a lamellated portion lined with ordinary 

 short cilia. The lamellated portion divides almost at once into 

 two parts, one leading to the spermatotheca, the other to the 

 oviduct. 



The duct to the spermatotheca, or rather from the sperma- 

 totheca, gradually becomes smaller and after a somewhat wind- 

 ing course enters a mass of circularly disposed muscle fibres, 

 the arrangement of which would indicate that they act as a 

 valve. In the center of this muscle mass is a small chamber 

 from which three ducts pass, — the above mentioned duct which 

 joins it to the oviduct, a duct to the spermatocyst, and a duct 

 to the spermatotheca. The duct to the spermatocyst is small 

 and the spermatocyst itself is a small, thin-walled, oval sac, 

 lined with short columnar cells which appear ciliated although 

 not prominently so in the preparations. In one animal sec- 

 tioned the spermatocyst was empty, in the others it was packed 

 full of spermatozoa and distended to twice or more than twice 

 its size when empty. In the one animal in which the sperma- 

 tocyst was empty all the female organs were dormant and ova 

 were not developing in the hermaphroditic gland, while the 

 glands of the male organs were active and spermatozoa were 

 found in some of the passages ; in all the other animals, the 

 female organs were in a state of activity. 



