BY T. HAKVEY JOHNSTON. 00 



round to enter directly into the Vtigina, the edge of the male 

 organ reaching a swollen rounded part, which evidently was 

 functional as an outer receptacuhun seminis. 



As already mentioned, the female pore lies immediately 

 behind, and at about the same dorso-ventral level, as the 

 male aperture. From it there passes inwards, the wide 

 vagina, which almost immediately becomes thrown into a 

 number of irregular coils. In this portion of the duct, one 

 pore is frequently more swollen and rounded than the rest, 

 and, being filled with spermatozoa, evidently acts as an 

 external receptaculum seminis. This latter may be seen per- 

 sisting even in ripe segments. After passing inwards between 

 the excretory vessels, it commences to arch posteriorly, just 

 behind the coiled portion of the vas deferens, which it crosses 

 dorsally, here widening into an elongate, thin-walled recep- 

 taculum seminis. The latter passes into a very short, narrow 

 fertilising duct, which passes through the shell-gland. 



The female complex lies just behind the middle of the 

 segment. It has already been stated that it separates the 

 male organ into a posterior and an anterior field. The ovary 

 is a transversely elongate organ, 0!24 mm. in breadth, very 

 distinctly bilobed, each lobe being made up of a number 

 of short tubes. The ovarian bridge lies ventrally below the 

 receptaculum. The short oviduct passes backwards to meet 

 the fertilising canal. The vitellarium lies in the bay between, 

 and behind, the ovarian lobes, as a rather solid organ, 0-075 

 mm. in breadth, whose margins are lobed. From it, there 

 passes forwards a very short yolk-duct, to the shell-gland, 

 which lies just antero-dorsally to it. 



The uterus at first develops in the region of the ovary, 

 but soon begins to increase in size by the development of 

 processes, the other organs in the segment becoming dis 

 placed. In the ripest proglottids present in the specimens, 

 the uterus may be seen as a large, ventrally situated, trans- 

 verse sac with strongly sacculated walls. The whole of the 

 midregion of the segment, with the exception of the extreme 



