STUDIES OX TUÉ ECTOrAUASITlC TllEMATODES OF JAPAN. 953 



this is behind the anterior sucker, but a little nearer the median line; 

 vcujtnal canal swollen at the Ijeginninijf, then becoming very tine, and 

 taking the usual course and describing some convolutions, opens at 

 last int(j the yolk-reservoir after it has Ibrmed an elongated, oval, 

 capacious receptacuhim semi nis just in front of the reservoir. Testes nu- 

 merous, irregularly polygonal, confined to the median regi(3n between 

 the intestinal trunks, mostly l)ehind the ovary. 



Habitai — Carapace of a copepod, probably of the genus Parapetahis, 

 parasitic on the gill of TJiijnnus alhacom (Jaj). Söda-gatsuwo). 



Localitij — ]\Iisaki. 



Dalc—Awj-mt 1891. 



o 



Tokyo, March 12, 1S04. 



