STUDIES OX THE ECTOrAllASlTIC TREMATODES OF JAPAX. 95 1 



a capacious ovijiJal rcceptacidum scmtnis at aljout two-thirds of its whole 

 course, and finally opsning into the yolk-re-JLn'X'oir. Testes numerous, 

 globular, present not only in the median region posterior to the ovarv, 

 but extending on both sides a little way into the lateral regions of tlie 

 body. Vas deferens formed as usual, proceeding at first forwards on the 

 left side of the ovary ; fjrming, also as usual, a large loop at the 

 front end of the ovary, and after descril)ing numerous, complicated 

 convolutifjns it enters the penis, inside whicli it expands and forms 

 a sort of vesicida seminalis, and finally opens into the cavity of the 

 penis at a short distance from its apex. 



The body oï this species is no transparent that even in alcoholic 

 specimens the internsd organs, even the smallest vasa etferentia, can be 

 seen throui-h, and their relations ascertained without staininu' and 

 mounting'. 



o 



Hahital — Fin of TJ)ijniLus sihi (Jap. Shibi). 



Locality — Osatsube (Hokkaido); collected Ijy Mr. Xozawa in 

 whose honour it is named. 

 Date — Not recorded. 



6. Tr'istomum hipamsiticum, n. sp. 

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

 Body elongated-oval, about 6 mm. long by 3 mm. broad, with 

 a sudden diminution of breadth in the anterior part a little behind 

 the anterior suckers ; with the anterior border slightly convex ; with 

 a notch at the posterior end of the body ; lateral margins entire, with 

 a series (of about sixty-two) of chitinous corpuscles like those of Trist. 

 0/// »a ??;;;/, one of which is represented in fig. 5, PI. XXV; the series 

 beginning a little behind the anterior suckers at the point where 

 the body undergoes a sudden increase of bretidth, and terminating a 

 little before reaching the posterior sucker. Anterior sachers nearly 



