304 



A. M. Banta 



TABLE Xlll— {Continued) 



Dark and illuminated regions returned to normal 



very short time. No careful study of the animal's actions at the 

 bounding plane between the illuminated and dark regions was 

 attempted, but numerous instances were noted in which animals 

 started into the illuminated area and at once turned back. 



Several other experiments upon Asellus under the influence of 

 direct sunlight were made and the results were fully as striking as 

 in the observations tabulated above. On the average for the whole 

 time of the experiments of this series only 9.6 per cent of the ani- 

 mals were in the illuminated area. 



By way of summary it may be said that Asellus was extremely 

 sensitive to direct sunlight, which it avoided if opportunity was 

 aiForded, and that immediately upon entering the illuminated area 

 It otten turned back. 



