l^Q S. GOTO. 



paper on I)ipIo:oo)i, the yolk-cells are during this season almost con- 

 tinuonsl}^ poured doirn the yolk-ducts, the s[)erniatoz(Xi in the vagina 

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

 yolk-ducts were also tilled entirely Avitli spermatozoa- instead of with 

 yolk-cells. Therefore there can scarcely he any d()ul)t th:tt the vagina 

 re:dly serves as such in these forms, and the stune is in all prohnhility 

 true of other species. 



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

 this name f^r the one already in vogue, caiialis ritcUo-intestinaJi.'i, on 

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

 connection with the yolk-duct. This n:ime, which was first used 

 by the ediior of the "American Xaturidist ",'"* is of wider a])plica- 

 tion and will cover .all those c:!ses which may l)e brouglit to light 

 l)y future investigations, pi-ovidcd only that the canal connects the in- 

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

 can:d was first observed in its true relaticm by Ijima'^^ and although 

 the C(3nnecti(m with the intestine was denied or questioned by some 

 M'l'iters his observation was afterwards confirmed and extended l)y 

 Dieckhoff,^^ R. Wright and MacaUum'*^ and l)y t,he ])resent 

 writer,*'-' and in this paper further cases will be brouglit forward. 



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

 Tridoiuuui, Epihaclla, Monocottjlc, and Calicotiili', but is present in alj 



1 ). Goto— Der Laurer'sche Kanal itikT die Scheide. Central] datt f. Bakteriol. u. Parasiten- 

 kunde, Bd. Xiy, 1S93. p. 793. 



2). yol. XXV, 1891. p. GG5. 



3). Ijiuia— Ueber den Zusammenhang des Eileitero mit dem Vi'rdanuugscanxl l>ei gewissen 

 Polystomeeu. Zoo!. Auzeig., yil, 1831. p. G35. 



4). Dieckhoff-Z. c. 



5). R. Wright and Macallum— Spliyraniira Osleri. Journal of Morphology, yol. 1, 1887. 



G). tioto— This Journal, Vol. IV, 18;)0. p. 185. 



„ — On the Connecting Canal between tlie Oviduct and the Intestine in some 

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



