86 FRESHWATER RHIZOPODS OF NORTH AMERICA. 



moprium was broken, the detached portion pushed off, and the retained 

 portion drawn in, and with this the large papilla of ectosarc. A moment 

 after, a large protrusion of the body occurred to the left of the posterior 

 extremity, followed by an abrupt discharge from it of twenty -four cells, 

 mostly of Didymoprium, with a few of Bambusina. The discharged cells 

 contained the yellow shriveled remains of the endochrome. A view of the 

 animal in the condition just described is represented in fig. 2. 



Later, as the animal slowly glided along, it presented the appearance 

 seen in fig. 3. The body was depressed pyriform, with the posterior nar- 

 row end crowded with long papilla?. In this condition it measured 0.28 

 mm. long. Eight hours subsequently, the same individual measured 0.24 

 mm. long by 0.16 mm. broad. 



In another instance I observed an active, well-fed Dinainoeba in the 

 act of swallowing a filament of Bambusina. The successive steps of the 

 process are represented in the woodcuts 1-12. 



Successive changes observed in Uinamceba mirabilis while in the act of swallowing a 

 filament of the alga Bambusina. The arrows indicate the course of movement in the 

 swallowing of the alga. 



When first seen, the animal was oval, 0.22 mm. long by 0.16 mm. 

 broad. The alga was 1.12 mm. long, and a portion of it was immersed in 

 the Dinamoeba, entering to the left of the posterior extremity, and extend- 



