The Reactions of Plaiiarians to Light 



103 



almost no goniotaxis, although the worm repeatedly crossed 

 the line of the angle. The response to the directive influence 

 of the light, too, was in this case even less than that of the 



Fig. 13 Planaria maculata. Considerable activity was shown over this course and a decided 

 inability to approach the source of the light beyond about the middle of the aquarium. 



Dendrocoelum just described, as is evident from the general wan- 

 dering character of the course. Although the Phagocata in ques- 

 tion frequented both sides of the aquarium — that which was toward 



