E UGLENOIDIDA , CHLOROMONA DID A 



127 



Notosolemis sinuatus Stokes (Fig. 42, n). 

 microns long. Both in standing water. 



Body about 20 



ORDER 6 CHLOROMONADIDA KLEBS 



The Phytomastigina placed in this order are of rare occur- 

 rence and consequently not well known. The majority possess 

 small discoidal grass-green chromatophores which on addition 

 of an acid become blue-green. The metabolic products are 

 fatty oil. Starch or allied carbohydrates are absent. Stigma 

 is also not present. 



Fig. 43 a. Gonyostomum semen. X325 (After Stein). 



b. Vaciiolaria virescens. yillS (After Senn). 



c. Trentonia flagellata. X 200 (After Stokes). 



d. Thaumatomastix setifera. X500 (After Lauterborn). 



Genus Gonyostomum Diesing. With grass-green chromato- 

 phores. There are highly refractile trichocyst-like structures in 

 the cytoplasm. 



Gonyostomum semen Diesing (Fig. 43, a). Sluggish animal. 

 Body about 45 to 60 microns long. In marshy water among 

 decaying vegetation. 



Genus Vacuolaria Cienkowski. Body grass-green, without 

 trichocyst-like structures. Anterior end narrow. With two fla- 

 gella. Cysts with a gelatinous envelope. 



Vacuolaria virescens Cienkowski (Fig. 43, b). Body about 

 75 to 100 microns long. Fresh water. 



Genus Trentonia Stokes. Bi-fiagellate as in the last genus, 

 but anterior margin is slightly bilobed. 



Trentonia flagellata Stokes (Fig. 43, c). Slow-moving or- 



