RHIZOPODS. 



seems less like a drop of froth, for the vesicles 

 are larger, and the two distinct layers of two different 

 sizes at once show that the Rhizopod is not Actino- 

 phrys, but is Actinosphaeriiim. 



tig. 96. — Actuiosphaerium Eichh6ruii, 



There is still another and more important difference, 

 which the reader may not observe unless he searches 

 for it with a high-power (^ or ^) objective. Each 

 ray has a thread or fine rod-like filament running 

 lengthwise through its middle, and differing slightly 

 in color from the softer part of the ray. This rod 

 begins within the body, below the outer layer of larger 

 protoplasmic bubbles, passing out between them and 

 extending almost to the end of the pseudopodal rays, 

 which are seldom withdrawn into the body. 



Actinosphaerium is sluggish, moving slowly and often 

 remaining motionless for a long time in one spot. It 



