424 WILLIAM A. KEENER AND WILLIAM H. TALIAFERRO. 



EXPLANATION OF PLATE I. 



FIG. i. (a) The pseudopodia have closed behind the prey; (b), (c), (d), and 

 (e) shows how the left pseudopodium grew down along and then away from the 

 right pseudopodium. The broken line in (e) indicates the place where the two 

 surfaces of the left pseudopodium fused to enclose the prey. (ap) indicates the 

 bilobed margin of the ectoplasm that over-arched the forming food vacuole. X 166. 



FIG. 2. The Chilomonas paramcecium was first encountered at position i . The 

 prey next retreated to position 2, indicated by the dotted contour. When the 

 second contact with the Amoeba proteus was made it retreated to position 3. The 

 contour of the position 3 is indicated by the darkest line. It lay in this third 

 position when it was ingested by the Amceba. X333. 



