STUDlEb OX THE ECTOPAKAfSlTlC TKEMATuDE« UE JAPAN. ^95 



wards, but sometime.s makes more or less windiiig-s (PI. FJ, tig\ 5). 

 In M. fiisifoiin is (1*J. n, tig. o) tlie vagina is but sliglitly enlarged, 

 but in M. truncata it assumes the shape of u goblet with its short neck 

 directed towards the front end of the body (Ph \\, ivj;. 1). In tiic 

 latter species it comnuinicates l)y an exceedingly shoi't. paired canal 

 with eitlier of the paired yolk-ducts; while in most otlier species the 

 sinjrle vao'inal canal i)roceeds backward for ii ^i-eater or Jess distance 

 aloni»- the median line of the bodv, and then divides riii'ht and left 

 into two branches, the paired vaginal canals, which tinally open each 

 into the paired yolk-duct ot the corresponding side, just as in (Jnclto- 

 cotijle. In J/, scidcnae the vagina immediately divides into two canals, 

 which, after proceeding backwards for a short distance, unite with 

 each other in the median line of the body between the vas deferens on 

 the dorsal and the uterus on the ventral side, then again separate from 

 each other, and proceed l^ackwards for a short distance, and finally 

 open into the paired yolk-ducts (PI. II, iig. ()). In Axinc Iwleroccrca 

 also, the vagina divides immediately into the paired canals; but in 

 this species these remain separate throughout their whole lengths, and 

 [)roceeding backwtnxls just on the inner side of the main trunks of the 

 intestine, finally 1)ecome continuous with the yolk-ducts " (PI. Nil, 

 fig. 1). Tliere is in this species another o})ening a little behind the 

 vagina (PJ. \lll, tig. o, .1), wdiich leads into a blind cavity, the 

 internal surface of winch is armed with low, conical spines like those 

 of the vagina; but although I have directed special attention to the 

 point I have not been able to observe any connection with the genital 

 organs, and am perfectly at a loss wdiat function to attribute to it. 

 In Axiiic aJ)ermNS the vaginal canal is single throughout its extent, 

 and opens' info the fore end of the un[)aired yolk-ducts. In Axlnc 



1). The Ijoundiry between the vag-inal canal and the yollc-duct is marked in the figure 

 with an asterisk. 



