Terrestrial Planarians from Japanese Territories. 



41 



soon takes the character of a narrow duct and pursues a backward 

 course just above the nerve cords, receiving the vitelHne glands at 

 numerous points. The vitelUne glands present an appearance of 

 branching cellular masses, extensively distributed in the inter- 

 spaces between the gut branches. Behind the common genital 

 aperture the oviduct rises obliquely upwards, to open into tlie 

 glandular organ from behind, without uniting with its fellow of the 

 opposite side into a common duct. The oviduct shows a distinct 

 lumen in its entire length. Its actual wall is formed by a richly 

 ciliated epithelium, directly below which is a thin muscular layer. 



Text fio-. 21. Copniatory org-ans of Plac. glaucus in sagittal section. Diao-rammatio. 

 Index letters as in text figs. 1 and 3. 



The glandular organ is a nearly oblong body with a thick 

 muscular sheath, opening into the vestibulum at a point below the 

 opening of the penis-sheath. The cavity is lined with an epithe- 

 lium made up of liigli columnar cells of a glandular nature. 



The vestibulum is supplied with an upwardly directed out- 

 bulging, which appears to serve as a seminal receptacle during 

 copulation. 



