STUDIES OX THE ECTOPAllASITIC TREMATODES OF JAPAX. 211 



directed towards tlie left side of the body, and the whole lying more 

 to the left than to the ri"-ht of the median line. Ocidact arisino: from 

 the front end of the larger lialf of the ovary, thence proceeding f jr 

 a short distance forwards and towards the left, and then bendinfi^ on 

 itself and retracing its course, proceeds backwards, and approaching 

 the posterior end of the body bends towards the right, and is con- 

 tinued int(3 the ootyp, which is therefore situated on the riglit side 

 of the body at a short distance from the trunk of the intestine. Ovi- 

 duct bearing a tolerably large, round receptaciduni seminis at its 

 foremost end where it bends on itself. From the ootyp the uterus 

 at first proceeds fcjrwards and towards the left side of the bodv, and 

 reaching the angle of the smaller (inner) half of the ovary, bends 

 slightly towards the right, and then proceeds straight forwards. 

 Vitdlaria of the two sides distinct in front but continuous be- 

 hind. Faire I yolk-ducfs slightly asymmetrical, that of the left side 

 being situated a little anterior to its fellow ; the ducts directed 

 ob]i(|uely across the long axis of the bod}^, and luiiting with each 

 other on the same level as the front end of the smaller half of the 

 ovary. The nupaired yolk-duct thence proceeds Ijackwards and slightly 

 towards the left, and reacliing the angle of the V-shaped ovary, bends 

 on itself and proceeds towards the right side, and finally opens into 

 the oviduct. Geiiito-intcstinal canal arising from the oviduct a 

 little anterior to the opening of the unpaired ^^olk-duct, proceeds 

 forwards, and towards the right opens into the intestine. Testes 

 numerous, rather small, extending from a little behind the ootyp 

 to the level of the pedicels of the foremost pair of suckers. 



Habitat — Mouth-cavity of Vagrus tuuiij'rons (Jap. Tai). Some- 

 times on the Cijmothoa parasitic in the mouth-cavity. 



Locality — ]\Iogi (near Nagasaki) and Hakodate. 



Date— July 1889 (Mogi) and August 1890 (Hako.). 



