598 DR. F. E. BEDDAB.B ON 



dorsally. In young ovaries, such as the one figured in text- 

 fig. 81, the riper eggs lie in straight lines connected by delicate 

 threads with the central mass, and suggestive almost of the 

 pseudopodia of a Rhizopod with the eggs carried along them. 

 This radiating appearance of the ovary is retained until the organ 

 is quite mature, when it consists of a group of sacs with, for the 

 most part, definite walls, enclosed in which lie the ripe ova. I 

 refer to this appearance of the ovary in considering the uterus on 

 a later page. It seems possible that this condition of the ovary 

 is to be compared to the testes, and that there are really several 

 separate ovaries, which, however, are more closeh'^ adpressed than 

 are the testes. In any case we have instances, like Stilesia, 

 where the single ovary consists simply of a single mass of egg- 

 cells, a condition which is to be compared with one of the sub- 

 divisions of the ovary in the present species. 



The vitelline gland in the immature segments lies exactly 

 opposite to the ovary, the vagina dividing, as described later, into 

 two ducts, which end respectively in the ovary and vitelline gland. 

 It is large and conspicuous in the mature proglottid. The shell- 

 gland is also quite conspicuous in this tapeworm. 



The vagina is wider and with thicker walls for a short space 

 after its orifice on to the exterior. It then nari-ows and runs a 

 very straight course towards the interioi- of the proglottid. It 

 then becomes again wider, and opens gradually or abruptly into 

 a dilated receptaculum seminis, which lies beside the vesicula 

 seminalis. This region of the female duct is thin- walled. It is 

 on a level with the ventral water-vessel. From the median end 

 of the swollen receptaculum arise two tubes, one of them being 

 the vitelline duct and the other the duct leading to the shell-gland 

 and to the ovary. These two ducts are very much narrower than 

 the receptaculum, into which they suddenly open. In immature 

 proglottids the receptaculum is rather wider than the vagina, and 

 gradually widens towards the internally situated end, there 

 diverging into two horns which are respectively the vitelline 

 duct and the ovarian duct. These ducts are in these immature 

 segments of hardly less calibre than the end of the receptaculum 

 into which they open. These and the sperm-duct pass towards 

 the exterior between the dorsal and ventral water vascular tubes. 



The terminal region of the vagina, i. e. that part nearest to the 

 external orifice of the tube, has a lining which is very deeply 

 stained by logwood, and so has the narrow region which imme- 

 diately ensues ; the rest of the vagina is not deeply stained in this 

 way. I noticed in the larger of the two specimens which I report 

 upon in the present communication that the narrow region of the 

 vagina lying between the terminal part and the portion which 

 may be termed receptaculum was much shorter than in the other 

 example. I am not certain, however, whether there may not be 

 some variation in this matter from segment to segment, an ex- 

 pansion of the lumen accounting for the different appeax^ance, It 



