JOURNAL OF ENTOMOLOGY AND ZOOLOGY 149 



in large droplets. I have not determined the exact relation of 

 these glands to the oviduct, but in the dormant specimen the 

 glands are separate and open into the oviduct by numerous 

 channels, and in active specimens, for at least a portion of its 

 course, the oviduct is separate. The oviduct ends in a large 

 opening with folded walls, situated in back of and somewhat 

 below the other two genital openings. 



The male branch of the common duct is very short and opens 

 into a large, thin-walled, convoluted, glandular sac. The walls 

 of this sac are lined with columnar epithelium about 50 microns 

 high, which seems to consist entirely of mucus cells. The upper 

 portion of nearly all the cells is empty and presents the char- 

 acteristic apiiearance of mucus cells, there being only a little 

 protoplasm gathered around the spherical dark-staining nuclei 

 at the base of the cells. 



It is possible that these cells possess cilia, as there is usually 

 a condensation of substance just bej'ond their upper borders, 

 but this may be a secretion product, and, if it does indicate cilia, 

 these cilia are very small and scanty. Near the end of the 

 glandular sac, the cells at one side become changed in character. 

 They remain about the same length as the mucus cells, but 

 become more closely packed, so that the nuclei which lie at the 

 extreme base, lie side by side, almost touching each other. The 

 cells are full of dark-staining secretion for about half their 

 length. The upper half is much less dense, but contains the same 

 substance, which is being thrown off into the lumen, where it 

 collects in droplets. This area of secreting cells gradually widens 

 so as to include the whole of the end of the gland, which soon 

 narrows down into a ciliated duct. The duct gradually de- 

 creases in size and the epithelial cells become shorter, while a 

 surrounding layer of circularly placed muscle fibres becomes 

 gradually thicker, until it passes into a tube, where it opens 

 into a wide canal, lined with very short, strongly ciliated cells 

 and surrounded by a heavy muscular wall. The external open- 

 ing is large, and the lining membrane is thrown into folds. 



