STUDIES ON THE ECTOPAKASITIC TREMATODES OF JAPAiT. gll 



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

 to the left than to the right of the median line. Oviduct arising from 

 the front end of the larger half of the ovary, thence proceeding for 

 a short distance forwards and towai'ds the left, and then bending on 

 itself and retracing its course, proceeds backwards, and approaching 

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

 tinued into the ootyp, which is therefore situated on the right side 

 of the body at a shoi't distance from the trunk of the intestine. Ovi- 

 duct bearing a tolerably large, round receptaculum seminis at its 

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

 at first proceeds forw^ards and towards the left side of the body, and 

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

 slightly towards the right, and then proceeds straight forwards. 

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

 hind. Pairei yolk-ducts slightly asymmetrical, that of the left side 

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

 obliquely across the long axis of the body, and uniting with each 

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

 ovary. The unpaired yolk-duct thence proceeds backwai'ds and slightly 

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

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

 the oviduct. Genito-intestinal canal arising from the oviduct a 

 little anterior to the opening of the unpaired yolk-duct, proceeds 

 forwards, and towards the I'ight 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 Pagrus tumifrons (Jap. Tai). Some- 

 times on the Cijmothoa parasitic in the mouth-cavity. 



Locality — Mogi (nejir Nagasaki) and Hakodate. 



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



