130 S. GOTO. 



paper on Dlplozoon, the yolk-cells are during this season almost con- 

 tinuously poured tloicii the yolk-ducts, the spermatozoa in the vagina 

 can not but have come from another individual. Often indeed the 

 yolk-ducts were also filled entu-ely with spermatozoa instead of with 

 yolk-cells. Therefore there can scarcely be any doubt that the vagina 

 really serves as such in these forms, and the same is in all probability 

 true of other species. 



Caxalis genito-ixtestixalis — I have proposed'^ to substitute 

 this name for the one already in vogue, canalis vitello-intesimalis, on 

 the ground that in many, indeed in most, species it has no direct 

 connection with the yolk-duct. This name, Avhich was first used 

 by the editor of the " American Naturalist ",-^ is of wider applica- 

 tion and will cover all those cases which may be bi'ought to light 

 by future investigations, provided only that the canal connects the in- 

 testine with any one part of the genital system. The genito-intestinul 

 canal was first observed in its true relation by Ijima'^ and although 

 the connection with the intestine was denied or questioned by some 

 writers his observation was afterwards confirmed and extended by 

 Dieckhoff,^' R. Wright and Macallum^^ and by the present 

 writer,"^ and in this paper further cases will be brought forward. 



Among the genera described in this paper this canal is absent in 

 Tristomum, Epihdella, ilonocotjjle, and Calicotijle, but is present in ;ill 



1). Goto — Der Laurer'sche Kanal und die Scheide. Ceutralblatt f. Bakteriol. u. Paraaiten- 

 kunde, Bd. XIV, 1893. p. 793. 



2). Tol. XXV, 1891. p. 665. 



3). Ijima — Ueber den Zusammeuhang des Eileiters mit dem VerJauungsoanal bei gewissen 

 Polystomeen. Zool. Anzeig., VII, 1834. p. 635. 



4). DieckhofE— Z. c. 



5). R. Wright and MacaUum— Sphyranura Osleri. Journal of Morphology, Vol. 1, 1887. 



6). Goto— This Journal, Vol. IV, 1830. p. 185. 



„ — On the Connecting Cana,l between the Oviduct and the Intestine in some 

 Monogen. Trematodes. Zoolog. Anzeig., XIV, 1891. p. 103. 



