PLATYHELMINTHES 



203 



~V--l,exc.ca, 



— - — ^* QIU. 



-. '-= ct. 



".exc.po. 



Fig. 149. 



Fig. 148. 



Fig. 148. The excretory canal system in Dendrocoelum lacteum. After Wil- 

 helmi. exc.po. excretory pores opening to exterior; l.exc.ca. lateral longi- 

 tudinal main excretory canals. 



Fig. 149. Terminal organ of an excretory canal, the flame cell. After 

 Wilhelmi. ca. excretory canal; ci. bundle of cilia forming the "flame"; 

 nu. nucleus of flame cell ; p. cytoplasm of flame cell. 



