Japanese Freshwater Triclads. 



11 



its lumen, iiuich as in Bd. annandalei. In tlie parenchyma around 

 tlie penis there exist numerous eosinopJiil penis-glands, tlie ducts 

 of which open into the cavity. 



The paired ovary occupies a ventral position l)ehind the first 

 (or second?) paii- of the gut branches. It is nearly ovoid in shape 

 and is composed of egg-cells in several stages of development. 



The vitelline glands are represented by branched cords of cells 

 arranged in single or double rows. They are widely distributed 

 in the interspaces between the gut branches and connected with 

 the oviduct at numerous points. The mode of connexion has 

 not been bnjught under ol)servation. 



Text fii^. 4. Sagittal section of genital organs of Bd. brunnca, diagrammatically shown. 

 Index letters as in text fig. 2. 



From the postero-lateral aspect of the ovary the oviduct arises 

 as a funnel-like wi<lening, which soon takes the character of a 

 narrow duct, pursuing a backward course just along the outer side 

 of the longitudinal nerve cord. In front of the genital aperture it 

 nears the median line, rising slightly upwards at the same time, 

 and unites with its fellow of the opposite side into a short unpaired 

 duct before opening into the posterior part of the genital atrium 

 behind the annular space from above. The oviduct shows a 

 distinct lumen in its whole length. As in Bd. annandalei, its direct 

 wall is of an homogeneous and ciliated epithelium which shows 



