5^94 '^- GOTO. 



anterior end of the ootyp, and the sinrjle yolk-àuct thus formed opens into 

 the oviduct about midway between the beginning of the ootyp and the 

 opening of the fjcnito-intc^tinal canal. The latter opens into the oviduct 

 at the beginning of the last third of the whole course of the ovi- 

 duct. The ritcUaria of the two sides are quite distinct in front as well as 

 behind, though the lobes of the opposite sides come close to each other. 

 Testes occupying a narro^^' region between tlie t\\o trunks of the intes- 

 tine, posterior to the ovary; rather small in size; about 25 in number. 

 No lateral branches on the median side of the intestine; the two intes- 

 tinal trunks of equal length, and nearly reaching the posterior end of 

 the body. Caudal disc continuous with the rest of the body ; suclcers 

 occupying the posterior half of the lateral border of the body; about 

 30 on each side; breadth 0.0i)0-0.140 mm. 



Ilahitat — Gill of Chinis ]iexa(jramnuts (Jap. Ainamé). 



Loca littj — Hakodate . 



D<(^6'— August 1<S90. 



8. Microcotijle sciaenae, n. sp. 



(PI. II, figs. G & G ./ ; n. YI, fig. 2.) 

 Bodij about 4 mm. long, slender, asymmetrical, rounded at 

 the anterior end and pointed posteriorly. Anterior suclier with a 

 septum. Common genital opening on the same level as the beginning 

 of the intestinal trunks ; genital atrium armed with two sets of chitin- 

 ous rods arranged in circles (PL YI, fig. 2, a & h). The longer 

 ones ((() are about 0.11 mm. long, each presenting two curvatures in 

 opposite directions, and are situated just in front of the opening 

 of the vas deferens. Only a sniîdl, terminal portion oi these rods 

 projects into tlie cavity of the atrium, the remaining portion lying im- 

 bedded in the mesenchyma. The other shorter ones (Ji) have the 

 f(3rm of a hook and are about 0.02 mm. in length. The.se are arrang- 



