8 Art. 2.— T. Kaburaki : 



the duct tlie lining epithelium is made up of normal ciliated 

 columnar cells, and the muscular coating is much better developed 

 than elsewhere. 



The seminal receptacle is a lai-ge sack-like organ, situated 

 close in front of the penis. The lining epithelium is made up of 

 large columnar cells of a glandular nature, resting upon a delicate 

 basement membrane, beneath which exists a layer of fine muscular 

 fibres. In the specimen examined, the organ appears to have 

 been in high secretory activity, containing enormous quantities of 

 fine granular substance, which becomes stained with eosin and is 

 perhaps secretion from the wall. Further, the cells were ol)served 

 to contain fine spherical droplets or to be vacuolated. 



Posteriorly the receptacle gives rise to the slendei- vaginal 

 canal, which runs over the entire length of tlie atrium, anc opens 

 into the vestibular part of the atrium l)ehind the unpaired oviduct 

 and just within tlie genital aperture. The vagma is internally 

 lined with an epithelium made up of cylindrical cells resting upon 

 a fine basement meml)rane. Just external to this are found the 

 internal circular and the external longitudinal muscular layers in 

 direct succession. 



Ii€lelloc€p1ni1a brunnea Ij. et Kab. 



(PI. I., fi--. 2.— Text figs. 3, 4.) 



This species is fairly conjnion in the Empire, and numerous 

 specimens have been discovered in cool running brooks at the 

 following places: Yemada and Kanazuchi in Prov. Rikuzen, 

 Koiwai in Prov. Rikuchu, Lunvaslnro in Prov. Iwashiro and 

 Kyoto. 



Eorm and Dimension. — The body is moderately large and 

 rather slender. The head is indistinctly marked ofï from the 

 trunk l:)y a gentle neck-like narrowing of the bod3^ The frontal 

 margin is crenate and weakly arched in tlie median parts, which 

 are thr-own into some folds on the interiorly turned swollen edge, as 

 is shown in text fig. 3. Behind that edge there exists a groove-like 

 depression. The lateral lobes are but little projected. The breadtli 



