PLATE 1 
EXPLANATION OF FIGURES 
1 First position of specimen with two small fragments of Oscillatoria within 
its body and in the act of ingesting a second filament of Oscillatoria. X 100. 
2 Second position after the ameba had been turned through 180 degrees by 
pushing against the partly ingested algal filament, a. The ameba was given time 
to fix itself to the substratum in this position, when the Oscillatoria filament 
was a second time pushed upon. This time the body of the ameba was not torn 
from the substratum and turned, but the tip of the ameba bent as the filament 
was pushed to position h. X 100. 
3 A very long, quiet Oscillatoria filament was being ingested when the pro- 
jecting part of the filament was bent about the ameba to about the position 
shown in contour h. When bent to this extent, the filament would slip from the 
glass rod and spring back as a straight rod. The filament was thus bent and 
released twenty times before the ameba released its hold on the plant. X 100. 
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