IG 



Art. 2. — Ï. Kaburaki 



The oviduct of each side springs from the lateral aspect of the 

 ovary as an ampullaceous passage, which is filled with spermatozoa. 

 This soon takes the character of a narrow tube, which proceeds 

 straight backwards just along the (^uter side of the nerver .cord. 



In the region 

 of the genital 

 aperture it 

 n ears t h e 

 median line, 

 to open into 

 the outer end 

 of the rather 

 wide vaginal 

 canal, without 

 uniting witli 

 its fellow of 

 the opposite 

 side into a 

 common duct. 

 Its direct wall 



is made up of an homogeneous layer without nuclei, much as in 

 both the preceding species. Immediately outside this layer come 

 two layers of internal circular and external longitudinal muscular 

 fibres. An inversion in the relative position of these two mus- 

 cular layers occnrs in the terminal parts of the oviduct, as described 

 by Stoppenbrixk (7(3). External to the muscular layers there 

 exists a cellular coating which probal)ly represents the sunken 

 parts of the lining epithelium. 



As already indicated, the oviduct receives the vitelhne glands 

 at several points of its course. The mode of connexion is quite 

 similar to that found in PI. j^olychroa, PI. ùurmacnsis, Dendrocoelum 

 lacteum and others. It is effected by means of a spherical giant 

 cell, wdiich usually contains an internal space filled with sper- 

 matozoa and probably communicating -with the lumen of the 

 oviduct. The cytoplasm of the cell is finely granular and exhibits 

 but little a.ffinit}^ for haematoxylin; the nucleus is far larger than 



jis od go 



Te.xt. fig. 5. Diagram .jf copulatory organs of Planaria fjoiio- 

 cepJiala Dugès m sagittal section. 

 ed ejaculatory duct, p penis, p.i penis-sheath. 

 Other letters as in text fig. 2. 



