FRESH- WATER RHIZOPODS. 



167 



/ 



^^Sgafe^-^W-M .- ->-:% '". 





FIG. 86. Group of corftmon fresh-water Rhizopods (after Leidy). A, Actinophrys 

 soZ, the " sun-animalcule," filled with vacuoles and containing three food-bodies 

 (zoospores of an alga) ; a fourth is just being ingulfed. The nucleus is not seen, 

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

 tended. 



C 1 , Arcella mitrata, a transparent individual showing the protoplasmic body sus- 

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

 (Highly magnified.) 



