76 



PHYSIOLOGICAL ACTIVITIES OF THE PROTOZOA 



the prey, which is then digested without even the formahty of carriage 

 into the shell of the captor (Fig. 23). 



Other rhizopods, as an ameba, throw out pseudopodia under the 

 stimulus of the touch of some other living animal or plant. These 



Fig. 24 



Actinobolus radians with tentacles partially retracted and -with five ingested halterias; 



swimming. (After Calkins.) 



surround the victim, which frequently does not begin to struggle until 

 ensheathed in a wall of protoplasm, from which it rarely escapes. 

 Large animals like rotifers, and relatively large plants like the des- 

 mids are thus captured and digested. 



While most of the protozoa thus far described wait until the prey 



