Terrestrial Planarians from Japanese Territories. 45 



course, the cords are connected by very numerous transverse com- 

 missures, and lateral^ give off numerous brandies towards the 

 nerve plexifs, lying below the superficial muscular system. ■ 



The common genital opening leads into the moderateh^ wide 

 atrium with a wall composed of an epithelium of high columnar 

 cells and a muscular coating. Anteriorly the atrium is in com- 

 munication with the seminal vesicle and posteriorly with the 

 glandular canal. 



Numerous testes are ventrally arranged in a single row on each 

 side of the body just outside the nerve cords, beginning from be- 

 hind the ovary and extending posteriorly nearly to the insertion 

 of the pharynx. The vasa deferentia, filled with spermatozoa, 

 extend backwards to a point in front of the genital opening, where 

 they bend inwards slightly rising upwards at the same time, and 

 finally open, each separately, into the relatively narrow seminal 

 vesicle. The vesicle shows a definite wall consisting of a single 

 epithelium of columnar cells and a muscular coating, passing be- 

 hind into a tubular passage which soon communicates with the 

 atrium. In the species examined the male organ is wholl}'- devoid 

 of intromittent part of any sort. 



vd sv 



Text fig. 23. Sagittal section of the copulatory orgaus of Ehynchodetnu^ ijimai, clia- 

 grammatically shown. 

 at atrium. 



Other letters as in text fig. 1. 



