NEW TAPEWORMS FROM THE HYRAX. 599 



is certain, moreover, that the wide internal region of the vagina, 

 before it divides into vitelline duct and ovarian duct, is susceptible 

 to variation ; for in some cases it was an abruptly formed spherical 

 sac, at other times merely a wider tube than the immediately pre- 

 ceding region of the vagina, I mention later that the end of the 

 receptaculum contains ripe ova in the mature proglottids. I have 

 never seen spermatozoa therein. 



Utenos. — In both of the two examples of this species the last few 

 segments became somewhat shorter from side to side than those in 

 front, and were also longer in the antero-posterior direction. One 

 would naturally associate these changes in the facies of the pro- 

 glottids with complete maturity and the existence in those segments 

 of embryos. As I find in these segments completely ripe eggs quite 

 detached from the ovary and associated together in small masses 

 I shall assume that the anatomical structure of these proglottids 

 is that of complete maturity. In this case the present species 

 difi'ers from those which we have been considering by the entire 

 absence of numerous paruterine organs like those of Inermi- 

 capsifer, etc. Even were these terminal segments not so fully 

 mature as I presume them to be, there would be, I should 

 imagine, at least some preparation for the formation of the 

 paruterine organs. But there is none. 



The ripe eggs were massed into more or less spherical groups 

 surrounded by a membrane. These were not to be distinguished 

 from the lobes of the ripe ovary, and I imagine that they were 

 merely the persistent ovary. In addition to these masses of eggs, 

 the end of the vagina, i. e. the dilated portion which I have termed 

 receptaculum seminis, was found in many cases to be full or nearly 

 full of ripe eggs unaccompanied by any interstitial cells. This 

 was not only the case with a receptaculum which was swollen into 

 a spherical contour at its base, but also in cases where the re- 

 ceptaculum ended merely as a slightly wider tubular sac. I have 

 no reason whatever to doubt these facts, as the receptaculum is 

 quite easy of identification. I am therefore disposed to think 

 that there is no uterus as a distinct and separate structure but 

 that the eggs are partly voided into the receptaculum and partly 

 remain in situ awaiting the loosening and perhaps disintegration 

 of the proglottids. It may be that one of the rounded sacs which I 

 regard as an ovary is really a uterus. Of this I cannot be positive, 

 especially in view of the very few completely mature proglottids 

 in both specimens. That both specimens were identical looks as 

 if the conditions above described are to be I'egarded as noimal. 



The testes extend through a good part of each proglottid, and, 

 as seen in sagittal sections, there are five or six rows of them 

 laterally, though not so many in the median region. In transverse 

 sections they are seen to extend from edge to edge of each segment, 

 being nowhere interrupted save where they meet with the female 

 reproductive organ. This row is mostly one deep, but in places two 

 or even three deep. I counted from 40 to 50 or so of separate testes 



