582 DE. p. E. BEDDABD ON 



are sometimes restricted in their extent to the space lying 

 between the dorsal and ventral vessels. In incompletely mature 

 proglottids this restriction appeared to be (at least usually) the 

 case, the gonadial tissue not extending ovitside or inside of the two 

 excretory tubes. I should also emphasize the fact that the ovary 

 and vitelline glands are, at least for part of their extent, situated 

 side by side. That is to say, the vitelline gland is not wholly 

 behind the ovary. In young proglottids the general lie of the 

 female gonad seemed to me to be rather oblique dorso-ventrally, 

 in accordance with the fact that the duct passes to the exterior 

 ventrally of the dorsal excretory vessel and that the two excretory 

 vessels lie in a nearly parallel plane. 



I have also a new fact of some little importance to add. I 

 have described the uterus in the sexually mature segments 

 as being a tubular structure running across the segments. I 

 have in younger specimens discovered the rudimentary uterus, 

 which consists of a solid chord of closely packed cells which 

 enclose no lumen. This is connected with the gonad tissvie 

 lying between the two excretory tubes and passes towards, but not 

 far towards, the middle line of the body above the larger ventral 

 excretory tube, but below the sperm-duct. The rudimentary 

 uterus ends in a club-shaped blind extremity. 



My former account of the testes of Thysanotcenia gambiana 

 is confirmed by the examination of fresh material. I have, 

 however, two points to add : the first is that while the testes 

 are practically grouped as there stated into two groups, there 

 are, nevertheless, a very few testes lying between the two ventral 

 excretory tubes, and thus really constituting a bridge between 

 the two separate masses, and bringing the arrangement of the 

 testes more into line with that of the second species of the 

 genus Thysanotcenia described in the paper referred to. These, 

 however, are indeed few ; I counted but three in a single 

 proglottid. The general statement with regard to the testes 

 remains, therefore, unafiected. Moreover, each testis is rounded 

 or oval in form, but I could not find the distinctly pear-shaped 

 outline that I describe in the species of Inermicapsifer dealt with 

 in the present paper. I should, furthermore, acid to my fonner 

 account the fact that the testes are mature before the ovaries, 

 and that in segments where the ovaiy is still immature the 

 vagina, as well as the vas deferens, is filled with sperm. The 

 sperm-duct is coiled and the coil lies principally between the 

 nerve-chord and the dorsal excretory tube, extending to a short 

 distance mediad of the latter. The coils have some regularity 

 and lie dorso-ventrally and parallel. I have found granular 

 tissue accompanying the sperm-duct. Cells lay here and there 

 between the coils, sometimes in numbers. 



The testes of the worm from the Hyrax are very distinctly 

 arranged in two sets in each proglottid. The great bulk of these 

 organs are on the side furthest away from the external pore. I did 

 not find a few scattered testes uniting these two groups such as occur 



