100 S. GOTO. 



of the ovary, is of an irregular shape, and occupies a position 

 anterior to the rest of the ovary (PJ, XY, fig. 1, or). The 

 remaining part is twice bent on itself at equal distances apart so 

 that it may be considered as consisting of four portions united end to 

 end. The ovidut portion is very much larger than the other three 

 portions. 



In Hexacotyle the ovary makes numerous, exceedingly complex 

 windings which can not he described with any degree of clearness, and 

 the reader is therefore referred to figs. 1 & 7 of PI. XIV. In Hexaco- 

 tyle acuta I have not been able to obtain a general view of the whole 

 ovary, and fig. 1 on the plate just referred to has been composed from 

 a series of sections, controlled as much as was practicable by examina- 

 tions of the specimens mounted in toto. The general form of the 

 ovary is that of a long cylinder bent on itself at its middle portion, 

 each half of which makes numerous convolutions. 



In Epihdella the ovary is a simple, sphericiil body, in which 

 the zones of formation and growth can not he distinctly separated 

 from each other, but the younger ova are found towards the 

 periphery, while the riper ones are situated in the central part. In 

 some species of Tristomum also the ovary is simply an irregularly 

 globular body ; but in most species it consists of a certain number of 

 more or less distinct lobes, which are incompletely separated from one 

 another by an intervening layer of connective tissue, all however freely 

 communicating with one another at the centre of the ovary. As in 

 Epibdella the unripe ova occupy the periphery, while the riper ones are 

 situated more in the central part. 



The ovarian ova are in all the species totally destitute of any 

 external membrane. 



Oviduct — As I have stated elsewhere,'' I designate by this 



. 1). CentralbLatt f. Bakteriol. «. Parasitenkunde, Bd. XIV, 1893. p. 798. 



