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Herbert Eugene Walter 



width of the aquarium and in doing so showed considerable indif- 

 ference to the directive influence of the light. Its susceptibility 

 to goniotactic stimulus is plainly shown by its behavior upon reach- 



Fig. 12 Bdelloura Candida. This path was traversed with much "wigwagging;'' there was indif- 

 ference to the source of light and locomotion was not of long duration. 



ing the angle formed at the junction of the sides and floor of the 

 aquarium, as well as by its manner of finally coming to rest. 



A typical Phagocata (Fig. n), on the other hand, exhibited 



