360 PROTOZOOLOGY 



radiating filopodia, giving the appearance of a typical heliozoan, 

 with a single flagellum which is difficult to distinguish from the 

 numerous filopodia, but which becomes conspicuous when the 

 pseudopodia are withdrawn; fresh or salt water. 



C. infusionum C (Fig. 164, a). 25-30/1 long; freshwater in- 

 fusion. 



C. marina Caullery. About lO/i in diameter; salt water. 



Family 4 Lithocollidae Poche 



Genus LithocoUa Schulze. Spherical body; outer envelope with 

 usually one layer of sand-grains, diatoms, etc.; nucleus eccentric. 



L. glohosa S. (Fig. 164, h). Body reddish with numerous small 

 colored granules; nucleus large; central granule unknown; 

 envelope 35-50// in diameter; in lakes, ponds, and rivers; also in 

 brackish water. 



Genus Astrodisculus Greeff . Spherical with gelatinous envelope, 

 free from inclusions, sometimes absent; no demarcation between 

 2 regions of the cytoplasm; pseudopodia fine without granules; 

 fresh water. 



A. radians G. (Fig. 164, c). Outer surface usually with adherent 

 foreign bodies and bacteria; cytoplasm often loaded with green, 

 yellow, or brown granules; nucleus eccentric; a contractile 

 vacuole; diameter 25-30/i including envelope; in pools and 

 ditches. 



Genus Actinolophus Schulze. Body pyriform, enveloped in a 

 gelatinous mantle; stalked; stalk apparently hollow; axopodia 

 long, numerous; nucleus eccentric; salt water. 



A. pedunculatus S. (Fig. 164, d). Diameter about 30/t; stalk 

 about lOO/i long. 



Genus Elaeorhanis Greeff. Spherical; mucilaginous envelope 

 with sand-grains and diatoms; cytoplasm with a large oil globule; 

 nucleus eccentric; 1 or more contractile vacuoles; pseudopodia 

 not granulated, sometimes forked; fresh water. 



E. cincta G. (Fig. 164, e). Bluish with a large yellow oil globule; 

 without any food particles; no central granule; pseudopodia 

 rigid, but apparently without axial filaments, sometimes forked; 

 young forms colonial; soHtary when mature; outer diameter 50- 

 60/1 ; body itself 25-30/t; in lakes and pools. 



Genus Sphaerastrum Greeff. Somewhat flattened; greater part 

 of axopodia and body covered by a thick gelatinous mantle; a 

 central granule and an eccentric nucleus; fresh water. 



