FRESU-WATER RUIZOPODS. 



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Fig. 86.— Group of cortmon fresh-water Rhizopods (after Loidy). A, Actinnjihriix 

 sol, the "sun-animalcule," filled with vacuoles and containin.LT three food-bodies 

 (zoospores of an alga) ; a fourth is just being ingulfed. The nucleus is i^ot seen. 



B, Difflugia urceolata, with shell built of sand-grains and pseudopodia far ex- 

 tended. 



C, Arcella mitrata, a transparent individual showing the protoplasmic body sus- 

 pended within the shell ; several vacuoles are shown, but no nucleus. 



(Highly magnified.) 



