206 



PROTOZOOLOGY 



D. ollula S. (Fig. 91,/). Lorica 20-25^ by 15^. 



Genus Stylochrysallis Stein. Body fusiform; with a gelatinous 

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

 without stigma; fresh water. 



S. parasita S. (Fig. 91, g). Body 9-1 l^u long; stalk about 15/x long; 

 on phytomonads. 



Fig. 91. a, Syncrypta volvox, X430 (Stein); b, Synura uvella, X500 



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



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

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



Family 3 Ochromonadidae Pascher 



With 2 unequal fiagella ; no pellicle and plastic ; contractile vacu- 

 oles simple; with or without a delicate test; solitary or colonial; 

 free-swimming or attached. 



Genus Ochromonas W3^ssotzki. Solitary or colonial; body surface 

 delicate; posterior end often drawn out for attachment; 1-2 chro- 

 matophores; usually with a stigma; encystment; fresh water. Many 

 species. 



0. muiahilis Klebs (Fig. 92, a). Ovoid to spherical; plastic, 15-30m 

 by 8-22/i. 



0. ludibunda Pascher (Fig. 92, b). Not plastic; 12-17m by 6-12^. 



Genus Uroglena Ehrenberg. Spherical or ovoidal colony, com- 

 posed of ovoid or ellipsoidal individuals arranged on periphery of a 



