MASTIGOPHORA, CHRYSOMONADINA 205 



pore; a single small chromatoi^hore; leucosin grain, contractile 

 vacuole; fresh water. 



P. aspergillus P. (Fig. 90, c, d). Shell about 35/i long by 25m wide; 

 chromatophore very small ; a large leucosin grain ; fresh water. 



Genus Myxochrysis Pascher. Body multinucleate, amoeboid; with 

 yellowish moniliform chromatophores, many leucosin granules and 

 contractile vacuoles; holozoic; surrounded by a brownish envelop 

 which conforms with body form; flagellated swarmers develop into 

 multinucleate Plasmodium; i)lasmotomy and plasmogamy; fresh 

 water. 



M. paradoxa P. (Fig. 90, e-j). Plasmodium 15-18/i or more in 

 diameter; in standing water. 



Family 2 Syncryptidae Poche 



Solitary or colonial chrysomonads with 2 equal flagella; with or 

 without pellicle (when {)resent, often sculptured) ; some possess stalk. 



Genus Syncrypta Ehrcnbcrg. Spherical colonies; individuals with 

 2 lateral chromatophores, embedded in a gelatinous mass; 2 con- 

 tractile vacuoles; without stigma; cysts unknown; fresh water. 



S. volvox E. (Fig. 91, a). 8-14^ by7-12M; colony 20-70ai in diam- 

 eter; in standing water. 



Genus Synura Ehrenberg. Spherical or ellipsoidal colony com- 

 posed of 2-50 ovoid individuals arranged radially; body usually 

 covered by short bristles; 2 chromatophores lateral; no stigma; 

 asexual reproduction of individuals is by longitudinal division ; that 

 of colony by bipartition ; cysts spherical ; fresh water. 



S. uvella E. (Fig. 91, 6). Cells oval; bristles conspicuous; 20-40)u by 

 8-17/x; colony 100-400^ in diameter; if present in large numbers, 

 the organism is said to be responsible for an odor of the water re- 

 seml)ling that of ripe cucumber (Moore). 



aS. adamsi Smith (Fig. 91, c). Spherical colony with individuals 

 radiating; individuals long spindle, 42-47^ by 6.5-7m; 2 flagella up 

 to 17ai long; in fresh water i)ond. 



Genus Hymenomonas Stein. Solitary; ellipsoid to cylindrical; 

 membrane brownish, often sculptured; 2 chromatophores; without 

 stigma; a contractile vacuole anterior; fresh water. 



H. roseola S. (Fig. 91, d). 17-50m by 10-20^. 



Genus Derepyxis Stokes. With cellulose lorica, with or without a 

 short stalk; body ellipsoid to spherical with 1-2 chromatophores; 

 2 equal flagella; fresh water. 



D. amphora S. (Fig. 91, c). Lorica 25-30m by 9-18^; on algae in 

 standing water. 



