Cestode of the Genus Zscliokkeella. 43 



inwards from the cirrus-sac and parallel with the vagina. 

 Its outer half only is somewhat closely coiled. Its inner end 

 is obscured by the mass of female glands. I have not 

 detected a vesicula seminalis, nor any netu'ork formed by the 

 vasa effereiitia, such as is described by Beddard (1912) for 

 Inermicapsifer and Hyracotania. 



The ovary (figs. 2 & 4, Ov.) is a fairly compact, some- 

 what lobulated organ of crescentic shape, the convexity 

 being anterior. The space between the two backwardly- 

 directed horns is occupi<'d by the compact shell-gland and a 

 small spherical organ (fig. 4, R S.), which appears to be at 

 the extremity of the vagina, and which I believe to be the 

 receptaculum seminis, and is closed in behind by the vitelline 

 gland, which lies at a somewhat lower level, towards the 

 ventral side. 



The vagina opens at an external pore, quite distinct from 

 that of the cirrus-sac, but immediately behind it. Its outer 

 half has a narrow lumen, and its course is somewhat undu- 

 lating. The inner hall, however, becomes straighter and 

 widens out into a thin-walled, spindle-shaped expansion. It 

 then narrows again before passing over the outer part of the 

 ovaiy to open into the small rounded organ which I have 

 called the receptaculum seminis. This organ, as described 

 here, appears to be a new structure. If my interpretation of 

 it be correct, it may possibly have been overlooked in the 

 accounts o£ related species, and the dilated, fusiform, proximal 

 portion of the vagina, which I have mentioned above, may 

 not be, as has been supposed, the true receptaculum seminis*. 



The small " recej)taculum " is connected with the ovary by 

 a short oviduct, which opens into it below, and is apparently 

 continued immediately, in the same straight line and in a 

 backward direction, to the shell-gland. Ventral to, and 

 extending behind, the latter organ, and connected with it 

 by a shoit duct, is the large compact vitelline gland (figs. 

 2 & 4, v.). 



From the shell-gland, on the dorsal side, a duct passes 

 upwards and forwards, bending round over the anterior edge 

 of the ovary, and then continuing its course below this to 

 the right, across the middle of the segment (fig. 4, Ut.). 

 This is the beginning of the uterus, which is visible by 

 reason of the contained ova in segments which are just 



* See Fulirmanii, 1902, fig. 18, is. {" ZschokJda^' linstoioi) ; t. Janicki, 

 1910, pi. xiii. tig. 17 , R.S. {'^ Iiiei-inicapsifer " hyracis). Also Beddard, 

 1912, p. 607, in the key to the genera: "Receptaculum seminis [in 

 Zichokkeella and Inermicapsifer] long and forming end of vagina.'' 



