224 



LIGHT AND THE BEHAVIOR OF ORGANISMS 



an object because of its size or orm. The eyes function 

 merely in distinguishing different degrees of intensity or 

 movement perhaps. Caprella seems to possess eyes of this 

 kind. At any rate when exposed to Hght from two sources 

 it swims toward any point between them, depending upon 







•3 mm 



Fig. 32. Camera outline of Caprella sp. (?). A, dorsal view; B, side view, 

 showing the extent of bending during locomotion. See text. 



their relative intensity, indicating that orientation is not 

 regulated by the same factors as in the toad. 



An idea of the general form and structure of the form on 

 which the following observations were made can be gained 

 by referring to Fig. 32. This creature is found in abun- 

 dance attached to Eudendrium colonies. I did not ascer- 

 tain the species. 



a. Orientation. — While attached this form shows no 

 indication of orientation, but when free it usually swims 

 toward a source of light fairly accurately. When it swims 

 slowly the anterior end, with its appendages spread out, is 

 thrown toward the ventral surface until it is nearly at right 



