STUDIES ON THE ECTOPAHASITIC TREMATODES OF JAPAN. 949 



the pharynx, at about tlie plane of the middle of the whole length of 

 tlie latter, rcuis short and thick. Orarii at the hinder end of the an- 

 terior third of the body proper, ovoid, being longer from riglit to 

 left, not lobed. Ocihict arising at the front end of the ovary in the 

 median line, thence proceeding forwards with a sliglit winding or two, 

 and continued into the ootyp. Uterus not very long, opening into 

 the genital atrium near its bottom, lltdhiritini maiidy confined to the 

 Literal regions and the anteri()r lobe of the l)ody, and oidy accompan}'- 

 ing the intestinal branches into the median region. I'aired yolh-ductfi, 

 ijolh-rcscrvoir, and vnpaired ijoJlc-duct as in the preceding species. Testes 

 small, globular, numerous, confined to the median region between the 

 intestinal trunks. Va(jinal opcniiuj a little behind the conmion genital 

 opening ; vaginal canal proceeding as usual backwards and towards the 

 median line, and a.fter forming a capacious, globular receptacuhuii 

 semliils, opening finally into the yolk-reservoir. 



Hahltat — Gill of an undetermined species of fish the Japanese 

 name of which is Hazara. 



L oca I Itij — M isaki . 



Date— Auismt 1891. 



Ô. Trlstominn Xû:au'ae^^' n. sp. 

 (PL XXV, figs. 1-3.) 

 Bodii elongated-ovate, al)out 12 nnn. long by 7 mm. broad, with 

 the truncate anterior border perfectly straight, with the anterior 

 lobe of the body separat(.'d from the lateral borders only by a 

 shallow constrictii^n ; lateral margin entire, destitute of any chitin- 

 ous corpuscle ; with a large notch at the posterior end of the body 



1). Dedicated to Shunjiro Nozawa, Xoiiakii^hi, Naturalist to the Fisheries Bureau 

 of the Hokkaido Chö, to whom as well as to Kazutaka Itö Esqr., the then Director of the 

 Fisheries Bureau, are due my best thanks for giving mo numerous facilities for collection 

 during my stay in Hakodate. 



