STUDIES OX THE ECTOPARASITIC TREMATODES OF JAPAN. X89 



folded many times on itself. Vaginal opening single, median, and 

 dorsal, situated four times as far in front of the anterior end of the 

 ovary as it is behind the common genital pore. The vaginal canal 

 continues single for a little more than half its whole course towards 

 the ovary, then divides, and the two canals after traversing one-fourth 

 their way towards the ovary become continuous with the paired, yolk- 

 ducts. These unite at the level of the anterior end of the S-shaped 

 portion of the ovary, and the single jjolk-duct thus formed opens into 

 the oviduct about midway between the beginning of the ootyp 

 and the point where the former receives the genito-intestvial canal. 

 This opens into the oviduct about half-way between the origin of the 

 oviduct and the beginning of the ootyp. The vitcllaria of the 

 two sides are entirely distinct both in front and behind ; ending 

 anteriorly at some distance from the point of bifurcation of the 

 alimentary canal, and reaching posteriorly the terminations of the 

 intestinal trunks, of which the left extends beyond the right. Testes 

 occupying a little less than one quarter of the whole length of the 

 body; of large size, about 27 in number. The trunks of the intestine 

 sending out numerous short branches on the inner side ; the left 

 trunk longer than its feUow; both extending into the caudal disc, 

 and entirely surrounded by the vitellarium. Caudal disc a little 

 longer than J the entire length of the body ; posterior suckers about 

 50 on each side; breadth 0.040-0.068 mm. 



Habitat — Gill of Scombrops chilodipteroides (Jap. Mutsu). 



Locality — Misaki. 



Date — December 1889. 



4. Microcoti/le reticulata, n. sp. 

 (PI. I, fig. 5 ; PL in, figs. 2, 3, & 4 ; PI. IV, figs. 2 & 3 ; PI. V, figs. 5 & 6.) 

 Body 6-10 mm., or more, long, elongated, and slightly asymme- 



