GOS Ml". R. J. Ortlepp on a new 



A tine duct, vas efferens, arises from each testis; these 

 eventually unite together to form the large and much con- 

 voluted vas deferens. The vas deferens commences just 

 dorsal of tlie ovary, and its convolutions fill up the space 

 between the ovary and the ventral excretory vessel : having 

 reached this vessel the vas deferens bends upwards, passing 

 over and between it and the dorsal excretory vessel. It then 

 again passes ventralwards and with a few convolutions passes 

 dorsal of the nerve-trunk to join up with the cirrus. 

 Throughout its whole course it is thin-walled with its lumen 

 tilled with spermatozoa. The cirrus is small, unarmed, and 

 only feebly muscular; it is lodged inside the cirrus-pouch 

 and its proximal portion may form one or two slight bends. 



The cirrus-pouch is pyriform in shape, about 100 /i long 

 and 40 /x. broad at its proximal end. It has a weakly mus- 

 cular wall, possessing only a thin layer of muscular fibres. 

 Its opening is on the edge of the proglottid, on a slight 

 bulging overhung by the free posterior angle of the segment 

 preceding. 



The ovary is situated in the middle of the segment. It 

 consists of about 15 club-shaped lobules, radiating dorsally, 

 anteriorly, and ventrally from their common centre. Its 

 lateral diameter is about 200 ytt. A slight concavity in its 

 posterior face is occupied by the shell and yolk glands. The 

 yolk-gland, which is about one-fifth as large as the ovary, 

 occupies a position aporally, while the shell-gland, which is 

 about one-twelfth as large as the ovary, occupies a more or 

 less similar position on the poral side of the ovary. 



The vaginal aperture is situated immediately posterior to 

 that of the cirrus-i)ouch ; it passes straight inwards along 

 tlve posterior edge of the cirrus-pouch to the dorsal surface 

 of the ventral excretory canal. This distal portion of the 

 vagina is thick-walled and muscular, having a very small 

 lumen. On passing over the ventral excretory canal it bends 

 obliquely inwards, passing between the dorsal and ventral 

 excretory canals, and at the same time its wall becomes much 

 thinner and its lumen mucii enlarged. The portion of the 

 female duct from here to the ovary I take to be the recepta- 

 cnlum semiuis, especially as it is in all mature segments 

 filled with spermatozoa. The proximal portion of the 

 receptaculum semiuis bends obliquely upwards and passes 

 into the ovary. 



A functional uterus is not developed ; the eggs when found 

 become scattered about singly throughout the central body 

 l)arcnchynia, being limited laterally by the ventral excretory 

 vessels and dorsally and ventrally by the transverse musclc- 

 slicath. 



