RHIZOPODA. 



In the body of one of these {A. bilimbosa), the 

 existence of starch granules has been detected by 

 the same observer. 



3. IVature of Rhizopoda. — The structure 

 of the remaining Ehizopods differs in no essential 

 respect from that of Am<jeba, In all, the body is 

 composed of the same simple gelatinous substance 

 or ' sarcode,' as it has been termed by Dujardin, 

 and in all, locomotion is performed by means of 

 Ijseudopodia. From this circumstance, the group 

 derives its name. 



3. Rhizopoda allied to Amceba. — The so- 

 called " sun animalcule " (Actinophrys), by some 

 placed among the Infusoria, may be regarded as 

 closely allied to Amoeba. The form of its body 

 ( fig. 2, a) is that of a depressed sphere, furnished 

 with a number of filiform pseudopodia radiating 



Fig. 2. 



Various forms of Rhizopoda : — a, Actinophrys sol in the act 

 of feeding; at d is shown a captured Infusorium which has just 

 entered the substance of the body ; b, portion of the same, mag- 

 nified 450 diameters ; c, Arcella acuminata; d, Difflugia proiei" 

 formis. 



in all directions. These pseudopodia are usually 

 somewhat longer than the diameter of the body. 



