STUDIES OX THE ECTOPAEASITIC TREMATODES OF JAP AX. J 99 



ed into the ootyp. It bears a small, globular receptaculum seminis at a 

 short distance from where it bends backwards towards the ootyp. 

 The uterus proceeds from the ootyp almost straight forwards toward 

 the genital atrium. ]^aginal openimj single, dorsal, median, situated 

 about as far behind the common genital opening as this is from the 

 anterior end of the body; it leads into a single vaginal canal, which 

 proceeds straight backwards on the dorsal side of the vas deferens and 

 opens into the yolk-duct just where the paired yolk-ducts unite with 

 each other. The vaginal canal is armed with conical spines near its 

 external opening. Vitellarium of each side distinct only at the anterior 

 end, extending from between the vaginal and the common genital 

 opening to near the posterior border of the body. Paired yolk-ducts 

 arising about midway between the common genital opening and the 

 front end of the ovar}', and soon uniting with each other in the 

 median line on the ventral side of the uterus. Unpaired yolk-diict 

 proceeding almost straight backwards and opening into the oviduct 

 just where this bends backwards towards the ootyp. Genito-intestinal 

 canal arising from the oviduct side by side with the unpaired yolk-duct 

 and proceeding forwards and towards the right finally opens into the 

 intestine. Testes of moderate size, tolerably numerous, occupying a 

 little less than f the whole median portion of the body. Genital 

 atrium as well as the terminal portion of the vas deferens armed with 

 conical spines. Suehers of but slightly unequal size, measuring 

 0.040-0.058 mm. in breadth; about 25 on one side and only one on 

 the other.' ^ 



Habitat — Gill of Belone schismatorlujnchus (Jap. Datsu). 



Locality — Hagi. 



Date— July 1889. 



1). lu reality there may be more. My specimens were, as already stated, collected some 

 time after the death 01 the worms, and consequently some of the suckers may have been torn 

 away. 



