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PKOTOZOOLOGY 



S. adamsi Smith (Fig. 86, c). Spherical colony with individuals 

 radiating; individuals long spindle, 42-4 7)u by 6.5-7/x; 2 flagella 

 up to 17ju long; in fresh water pond. 



Genus Hymenomonas Stein. Solitary; ellipsoid to cylindrical; 

 membrane brownish, often sculptured; 2 chromatophores ; with- 

 out stigma; a contractile vacuole anterior; fresh water. 



H. roseola S. (Fig. 86, d). 17-50^ by 10-20^. 



Genus Derepyxis Stokes. With cellulose lorica, with or without 

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

 2 equal flagella; fresh water. 



Fig. 86. a, Syncrypta volvox, X430 (Stein); b, Synura uvella, X500 

 (Stein); c, *S. adamsi, X280 (Smith); d, Hymenomonas roseola, X400 

 (Klebs); e, Derepyxis amphora, X540 (Stokes); f, D. ollula, X600 

 (Stokes); g, Stylochrysallis parasitica, X430 (Stein). 



D. amphora S. (Fig. 86, e). Lorica 25-30^ by 9-18/x; on algae in 

 standing water. 



D. ollula S. (Fig. 86,/). Lorica 20-25^ by 15^. 



Genus Stylochrysallis Stein. Body fusiform; with a gelatinous 

 stalk attached to Volvocidae; 2 equal flagella; 2 chromatophores; 

 without stigma; fresh water. 



S. parasita S. (Fig. 86, g). Body 9-1 l/x long; stalk about 15//. 

 long; on phytomonads. 



