Selection of Food m Sfeiitor CcBruleus (Ehr.) 



91 



s = starch grains; p = Phacus; c = Coscinodiscus; sp = swarmspore. Where ( — ) occurs 

 it signifies that the group in which it is found was broken; that is, some of the members of the 

 group were eaten while the others were rejected. Thus, in group 36P, 37P, 38p, ( — ), which 

 consisted of four particles fed simultaneously, the first three were eaten while the last one was 

 rejected. Size of starch is given in terms of Phacus. 



TABLE II 



Experiment 2, Discrimination between Starch Grains and Phacus 



SUMMARY 



Eaten, 50 Phacus, and i starch grain. 



Rejected: 18 starch grains, i Coscinodiscus, and I swarmspore. 



