250 HANDBOOK OF PROTOZOOLOGY 



Heterophrys myriopoda Archer (Fig. 99, c). Endoplasm and 

 nucleus eccentric; ectoplasm is loaded with spherical algae, 

 living probably as symbionts. Contractile vacuoles indistinct. 

 Diameter 50 to 80 microns. In pools and marshes, and also 

 among marine algae. 



Genus Elaeorhanis Greeff. Body spherical. Mucilaginous 

 envelope with sand-grains and diatom frustules. The cytoplasm 

 with a large oil globule; a single nucleus, eccentric; one or more 

 contractile vacuoles; pseudopodia not granular. One species. 



Elaeorhanis oculea (Archer) (Fig. 99, d). The cytoplasm 

 bluish with a large yellow oil globule; without any food par- 

 ticles. No central granule. Pseudopodia rigid, but apparently 

 without axial filament (?), sometimes forked. Young forms are 

 colonial; solitary when old. Outer diameter 50 to 60 microns, 

 body itself 25 to 30 microns. In lakes and pools. 



Genus LithocoUa Schulze. Spherical body; outer envelope 

 with usually one layer of sand-grains and diatom frustules. 

 No oil globule. Nucelus eccentric. Two species. 



LithocoUa glohosa Schulze (Fig. 99, e). The ectoplasm is 

 reddish in color with numerous small colored granules. Nucleus 

 large; central granule is unknown. Diameter of envelope 35 to 

 50 microns. In lakes, ponds, and rivers; also in brackish water. 



Genus Sphaerastrum Greeff. Body somewhat flattened. 

 The greater part of the axopodia and the body are covered by 

 a thick gelatinous mantle. A central granule and an eccentric 

 nucleus. 



Sphaerastrum fockei Greeft" (Fig. 99,/). Diameter about 30 

 microns. Often colonial. In swamps. 



Suborder 3 Chalarothoraca Hertwig and Lesser 



Heliozoa with isolated or united spicules. 



Genus Pompholyxophrys Archer. Spherical body; outer 

 mucilaginous envelope with minute colorless spherical granules 

 arranged in concentric layers. Nucleus single, eccentric; con- 

 tractile vacuoles. Pseudopodia long, straight, acicular. 



Pompholyxophrys punicea Archer (Fig. 100, a). The cyto- 

 plasm colorless or reddish, with usually many colored granules 

 and green to brown food particles; nucleus large, eccentric. 



