PLATE 1 



EXPLANATION OF FIGURES 



1 A specimen encountering a green plant, Eromosphaera. The arrow in- 

 dicates the direction in which the spherical plant-cell was turned when the Pelo- 

 myxa first came in contact with it. X 100. 



2 Pelomyxa reacting to two desmids, which had been encountered synchron- 

 ously. The desmid at pseudopod B was rejected at 1 ; that at pseudopod A 

 was rejected at 2. X100. 



3 and 4 A specimen reacting to a non-motile ciliate-containing glea of bac- 

 teria. The outline to the right shows the contour of the larger kind of ciliate 

 that was enclosed in the glea. X 100. 



400 



