PLATE 2 



EXPLANATION OF FIGURES 



5 Pelomyxa reacting to Chilomonas which had made contact with it as it 

 came along path indicated by arrow. X 100. 



6 Pelomyxa reacting to a Cryptomonas with which it had not come in con- 

 tact. X 100. 



7 Polomyxa reacting to two paramecia and a smaller ciliate. X 100. 



402 



