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opposite sides of the body will be stimulated 

 differently according to the direction of the light 



Fig. 92. Eye Capsules of Flatwobm: (B) Section of "Goblet 



Eye" (from Plate after Hesse); (A) Location of Eyes 



(after Parker and Has well). 



(B, from Allgem. ZooL, Gustav Fischer.) 



For details, see p. xxxv. 



and according to their own orientation in the 

 body. Here the function of paired eyes in enabl- 

 ing the organism to adjust its own axis of locomo- 

 tion to the direction of the light comes into view. 



177 



