46 WM. A. KEPNER AND B. D. REYNOLDS. 



Plate IV. 



Fig. 8. Difflugia spiralis. At 11:29 A.M. specimen A lay as indicated 

 in figure. Four minutes earlier a fragment had been taken from a pseudopod 

 of this animal A and removed from the drop of water. Specimen B was 

 brought to position indicated in figure. Fragment C was cut from B without 

 disturbing A even so much as to cause it to retract its pseudopod. B was 

 then removed. A travelled to position A' and moved out of field. It was 

 then brought back to less than half a shell's length from fragment C, but 

 though one of its pseudopods passed directly over C, it did not react to 

 fragment C, nor did this fragment of B's ectoplasm react towards the in- 

 complete cell A. X 250. 



