I. ÎJIMA AND T. KAliUKAKI. 



body margin of the same side. Mouth at about the hind end of the middle 

 third of body. Pharynx insertion at about the middle of body. Anterior 

 gut trunk with ic-ii pairs of branches; each posterior gut trunk with 

 about 20 lateral branches. 



In all the specimens we have examined, sexual organs were not 

 developed. 



Locality : — Beneath stones and fallen leaves in a cool running stream 

 in the wooded hills to the east of Toyohara (Vladimirofka), Saghalin. The 

 species was collected together with Polycclis karafto described further on 

 in this paper. Collected by Ijima, June 1906. 



10. Sorocelis sapporo, n. sp. 



Woodcuts 19 and 20. 



Frontal margin subtruncate, with a gentle median convexity ; head on 

 both sides produced into moderately distinct tentacles rounded at end. 



20 



ig. Sorocelis Sapporo, n. sp. in the cleep 

 ing state, about 4X. 



20. Same. Diagram of sexual organs. 



Index letters as in woodcuts 2, 4 and 8. 



Trunk in the creeping state slender, 

 being for the most part of a nearly uni- 

 form breadth ; obtusely pointed at the 

 posterior extremity. 



Large specimens in the creeping 

 state measure 17 mm. in length and 2 

 mm. in breadth at pharynx region ; 

 mostly smaller ; breadth and length in 

 ^ the proportion of 1 to 6-8. 



Nearly colorless and translucent, 

 but digestive tracts revealing them- 

 selves in milky white, yellowish, brown- 

 °d ish, darkish or even pinkish color. 



Eyes extremely small, numerous, 

 increasing- in number with growth of 

 body, but never quite reaching 100 

 in total number ; distributed in two 



