STUDIES OX THE EC TOPARISITIC TREMATODES OF JAPAN. J-^Q 



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

 dorsal, situated four tiuies as fir in front of the anterior end of the 

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

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

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

 their way towards the ovary become continuous with the pair c,l yolk- 

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

 portion of the ovary, and the mvjle ijolk-dact thus formed opens into 

 the oviduct about midway between the Ijeginning of the ootyp 

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

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

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

 two sides are entirely distinct both in froat 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 

 bod}^; of large size, about 27 in number. The trunks of the intestine 

 sending out numer(3us short branches on the inner side ; the left 

 trunk lonirer than its fellow: both extendini>' 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 O.OJiO-O.OGS mm. 



Habitat — Gill of Scomhrops cliilodipteroides (Jap, Mutsu). 



Local it ij — Misaki. 



Date — December 1889. 



4. Microcotgle reticulata, n. sp. 

 (PL I, fig. 5 ; ri. Ill, figs. 2, 3, & 4 ; PI. IV, figs. 2 & 3 ; PI. Y, figs. 5 & G.) 



Bodij G-10 mm., or more, long, elongated, and slightly asymme- 



