Terrestrial Planarians from Japanese Territories. 



25 



The paired ovary, situated behind the brain, gives rise to tiie 

 oviduct on each side, which 23roceeds backwards just outside the 

 longitudinal nerve cord receiving the vitelline glands at numerous 

 points. The vitelline glands are represented by branching cellular 



Text fig. 11. Genital organs of D. hilgendorfi in sagittal section, diagrammatically shown. 

 Index letters as in text figs. 1 and 3. 



cords, extensively distributed in the interstices between the gut 

 diverticulae. Behind the genital opening the oviduct, supplied 

 with numerous unicellular glands, nears the median line, rising 

 obliquely upwards at the same time, and finally unites with its 

 fellow of the opposite side, to form a short common duct, which 

 soon enters the glandular organ at the posterior end. The duct 

 shows a distinct lumen throughout its entire length. Its direct 

 wall is formed by a richly ciliated epitlielium, outside which is a 

 muscular layer of circular fibres. 



The glandular organ, situated dorsal to the vestibulum, is an 

 oblong muscular organ, which anterior!}^ communicates with the 

 vestibulum, through the ciliated narrow passage, at a point close 

 to the opening of the penis-sheath. It is internally lined with a 



