188 S. GtOTO. 



These unite with each other at the level of the front end of the 

 posterior S-shaped portion of the ovary, and the single tjolk-duct opens 

 into the oviduct at a little distaace from the beginning of the ootyp. 

 The genito-intestinal canal opens into the oviduct about midway between 

 the origin of the latter and the beginning of the ootyp. The vitellaria 

 of the two sides are entirely distinct both in front and behind ; 

 they end anteriorly near the point of bifurcation of the alimentary 

 canal, and posteriorly with the body proper, not extending into the 

 caudal disc, but leaving the posterior portion of the intestinal trunks 

 naked. Testes occupying a little less than one-fifth the whole length 

 of the body, posterior to the ovary ; of rather small size, about 40 

 in number. The two trunks of the intestine sending oat only a few 

 short branches towards the median side ; the left leg longer than the 

 right, and both extending for a certain distance into the caudal disc. 

 This occupies about ^ the whole length of the body. Posterior suckers 

 about 29 on each side ; breadth 0.068-0.128 mm. 



Habitat — Gill of Sebastes sp. sp. (Jap. Ma-zoi and Nagara-zoi). 



Locality — Hakodate. 



Date— August 1890. 



3. Microcotyle elegans, n. sp. 

 (PI. I, fig. 4; PI. V, fig. 2.) 

 Boiij about 4 mm. long, slender, symmetrical. Anterior sucker 

 with a septum. Common genital opening a little in front of 

 the beginning of the intestinal trunks; atrial spines conical, about 

 0.005 mm. in length; a few spines being also present on the posterior 

 wall. Omrg in the anterior half of the body,, its hinder end being 

 nearly at the middle of the whole length. Its anterior half is inter- 

 mediate in form between the corresponding portions of J)/, caulata and 

 M. sebastis; the posterior half is S-shaped, and the terminal portion is 



