MASTIGOPHORA, CHRYSOMONADINA 



211 



with a flagellum, a chromatophore, and a leucosin mass; cyst may 

 show a wing-like rim; cold freshwater streams. 



Fig. 94. a, b, Rhizochrysis scherffeli, X500 (Scherffel). a, 4 chroma- 

 tophore-bearmg individuals and an individual without chromatophore- 

 b, the last-mentioned individual after 7 hours, c, d, Chrysarachnion insi- 

 dians (Pascher). c, part of a colony composed of individuals with and 

 without chromatophore, X1270; d, products of division, one individual 

 lacks chromatophore, but with a leucosin body, X2530. e, f, Chrysothy- 

 lakion vorax (Pascher). e, an individual with anastomosing rhizopodia and 

 excretion granules," X870; f, optical section of an individual; the cyto- 

 plasm contains two fusiform brownish chromatophores, a spheroid 

 nucleus, a large leucosin body and contractile vacuole, X about 1200. 



