MASTIGOPHORA, CHRYSOMONADINA 



263 



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

 sembling that of ripe cucumber. 



S. adamsi Smith (Fig., 107 c). Spherical colony with individuals 

 radiating; individuals long spindle, 42-47/t by 6.5-7// ; 2 flagella up 

 to 17// long; in fresh water pond. 



Fig. 107. 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). 



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. 107, d). 17-50// 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. 107, e). Lorica 25-30// by 9-18//; on algae in 

 standing water. 



D. ollula S. (Fig. 107,/). Lorica 20-25// by 15//. 



Genus Stylochrysalis Stein. Body fusiform; with a gelatinous 

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

 without stigma; fresh water. 



S. parasitica S. (Fig. 107, g). Body 9-1 l/i long; stalk about 15/z 

 long; on phytomonads. 



