384 WM. A. KEPNER AND J. GRAHAM EDWARDS 



contour of the algal cell. This process continued until either 

 a cup or an over arching of the Rhizopod's protoplasm had 

 advanced to the contour a — figure 1. The margin a then ad- 

 vanced to contour b and beyond to margins c and c' which had 

 fused, bringing the spherical green cell within a closely fitting 

 food vacuole. Within five minutes the Eromosphaera was 

 rejected by the Pelomyxa. 



November 13, 1916. The specimen shown here reacting to 

 two desmids, had taken through its dorsal surface two days 

 previously a chilomonas and had unsuccessfully reacted to 

 Paramaecium caudatum. This Pelomyxa came in contact with 

 two rounded, green desmids A and B. Each desmid was then 

 intimately surrounded and carried into the cytoplasm (fig. 2). 

 Within five minutes, however, B was thrown out as 1 leaving 

 a bi-forked cytoplasmic projection from which it had been 

 dropped. Within ten minutes A had been ejected at 2 leaving 

 a distinct cytoplasmic pocket as shown. 



In the above examples we have instances of Pelomyxas hav- 

 ing ingested non-motile plants, which were giving off oxygen. 

 These plants were sooner or later rejected; but this is not al- 

 ways the case as the following observation shows. 



November 7, 1916. Messrs. F. L. Foster and C. Zirkle al- 

 ternated with us in observing a specimen that had been in a 

 hanging drop containing long desmids and Euglenas. This 

 specimen was pushing three non-motile Euglenas ahead of it 

 and gliding by a fourth with which it was in contact. One of 

 the Euglenas was ingested and retained. 



November 27, 1916. A specimen was travelling along in 

 the direction of the two pseudopods 1 and 1 ' as indicated by the 

 arrows (fig. 3). Pseudopod./' came in contact with a rounded 

 bacterial mass within which were two kinds of ciliates. The 

 longer type of ciliate was about the size of Loxocephalus granu- 

 losus, but for these we had no time in which to determine the 

 genera and species. When this contact with the mass of 

 bacteria and of ciliates was made, a reversal of the course of 

 pseudopod 1 occurred as indicated by arrow 2 and pseudopod 3 

 grew out over (above) the bacterial glcea and in this way ex- 



