ACTINOPODA, HELIOZOA oil 



Family 6 Clathrellidae Poche 



Genus Clathrella Penard. Envelope distinct, polygonal; surface 

 with uniform alveoli with interalveolar portion extending out; en- 

 velope appears to be continuous, but in reality formed by a series 

 of cup-like bodies; contractile vacuole large; voluminous nucleus 

 eccentric; filo podia straight, some bifurcated, arising between 

 "cups." 



C. foreli P. (Fig. 21(3, a). Envelope about 40-55ju in diameter; 

 fresh water. 



Family 7 Acanthocystidae Claus 



Genus Acanthocystis Carter. Spherical; siliceous scales, arranged 

 tangentially and radiating siliceous spines with pointed or bifur- 

 cated ends; nucleus eccentric; a distinct central granule in which 

 the axial filaments terminate. Several species. 



A. aculeata Hertwig and Lesser (Fig. 216, b). Tangential scales 

 stout and pointed; spines curved and nail-headed; cytoplasm grey- 

 ish; a single contractile vacuole; diameter 35-40>; spines about 1/3 

 the body diameter; in fresh water. Morphology and reproduction 

 (Stern, 1924). 



Genus Pompholyxophrys Archer. Spherical; outer mucilaginous 

 envelope with minute colorless spherical granules arranged in con- 

 centric layers; nucleus eccentric; contractile vacuoles; pseudopodia 

 long, straight, acicular; fresh water. 



P. punicea A. (Fig. 21G, c). Body colorless or reddish, with usually 

 many colored granules and green or brown food particles; nucleus 

 large, eccentric; solitary, active; diameter 25-35^; outer envelope 

 5-10/x larger; in pools. 



Genus Raphidiophrys Archer. Spherical; mucilaginous envelope 

 with spindle-shaped or discoidal spicules which extend normally 

 outwards along pseudopodia; nucleus and endoplasm eccentric; 

 solitary or colonial; fresh water. Several species. 



R. pallida Schulze (Fig. 216, d). Outer gelatinous envelope 

 crowded with curved lenticular spicules, forming accumulations 

 around pseudopodia; ectoplasm granulated; nucleus eccentric; con- 

 tractile vacuoles; axial filaments arise from the central granule; 

 solitary; diameter 50-60>; nucleus 12-15^ in diameter; spicules 2G> 

 long; among vegetation in still fresh water. 



Genus Raphidocystis Penard. Spicules of various forms, but un- 

 like those found in the last genus. 



R. tubifera P. (Fig. 216, e). Spicules tubular with enlarged extrem- 



