STUDIES OX THE ECTOPAÈASITIC TREMATODES OF JAPAX. 935 



respectively from tlie anterior and posterior portions; proceeding towards 

 the median line, and unitinü; with its fellow of the opposite side 

 at the front end of the ovary a little to the left of the median 

 line. UnpciireJ yolk-duct very short, proceeding from the point of 

 union of the paired yolk-ducts straight to the oviduct. Vaginal 

 opening a short distance behind the common genital opening, 

 nearly on the same longitudinal line ; vaginal canal long, mak- 

 ing numerous convolutions and opening into the yolk-duct at 

 the point of union of the paired ducts of the two sides. Testes 

 large, two in number, paired, irregularly ellipsoidal, situated just 

 behind the ovary. A single short vas effercns arising from each 

 testis, immediately uniting with the (3ther and forming the vas 

 deferens. This proceeds forwards with numerous complicated convolu- 

 tions as represented in fig. 3, PI. XX^"I, and finally entering the 

 penis at its base and traversing nearly its whole length finally opens 

 near its apex. Vroslatc gland very large, vesicular, elongated, just 

 behind the penis. 



Hahitat — Gill oî Lclhriniis sp.! (Jap. Kuchibi-dai). 



Local it g — Hagi . 



Da/d— August 1889. 



2. Epihdclla ovata, n. sp. 

 (PI. XXVI, figs. 4-8.) 

 Bodg srpiarish-oval, a little broader in the posterior part, Hat, 

 about 2 mm. long. Anterior suckers elliptical, connected with each 

 other by a thin membrane. iVs^t'r/or SHtiYT elli[)tica], with its long- 

 er axis at a right angle to the long axis of the body, witli a 

 marginal membrane, with a pair of notches on its anterior and 

 posterior margins, due to the insertion of muscular fibres at these 

 points; with three pairs of hoolcs of the form represented in fig. 5, 



