ACTINOPODA, HELIOZOA 507 



Family 2 Actinophyridae Claus 



Genus Actinophrys Ehrenberg. Spheroidal; cytoplasm highly vac- 

 uolated, especially ectoplasm; with often symbiotic zoochlorellae; 

 nucleus central; 1 to many contractile vacuoles; axopodia straight, 



Fig. 214. a, Actinocoma ramosa, X630 (Penard); b, Actinophrys sol, 

 X400 (Kudo); c, Actinosphaerium eichhorni, X45 (Kudo); d, Camp- 

 tonema nutans, X350 (Schaudinn). 



numerous, axial filaments terminate at surface of the nucleus; "sun 

 animalcules"; fresh water. 



A. sol E. (Figs. 90; 214, b). Spherical; ectoplasm vacuolated; endo- 

 plasm granulated with numerous small vacuoles; a large central 

 nucleus; solitary but may be colonial when young; diameter variable, 

 average being 40-50^; among plants in still fresh water. Reproduc- 

 tion, morphology and physiology (Belaf, 1923, 1924); food habit 

 (Looper, 1928). 



