PHYTOMONADINA 191 



chromatophore cup-shaped; pyrenoid; stigma; a contractile 

 vacuole; fresh water. 



L. rostrata Hazen (Fig. 90, j). 5-12^1 by 4-8/x. 



Genus Diplostauron Korschikoff. Rectangular with raised 

 corners; 2 equally long flagella; chromatophore; one pyrenoid; 

 stigma; 2 contractile vacuoles anterior; fresh water. 



D. pentagonium (Hazen) (Fig. 90, k). 10-13/z by 9-10;u. 



Genus Gigantochloris Pascher. Unusually large form, equalling 

 in size a colony of Eudorina; flattened; oval in front view; 

 elongate ellipsoid in profile; membrane radially striated; 2 

 flagella widely apart, less than body length; chromatophore in 

 network; numerous pyrenoids; often without stigma; in wood- 

 land pools. 



G. permaxima P. (Fig. 90, 0- 70-150^ by 40-80^ by 25-50^. 



Genus Gloeomonas Klebs. Broadly ovoid, nearly subspherical; 

 with a delicate membrane and a thin gelatinous envelope; 2 

 flagella widely apart; chromatophores numerous, circular or oval 

 discs; pyrenoid (?); stigma; 2 contractile vacuoles, anterior; 

 fresh water. 



G. ovalis K. (Fig. 90, m). 38-42iU by 23-33/x; gelatinous envelope 

 over 2yu thick. 



Genus Scourfieldia West. Whole body flattened; ovoid in front 

 view; membrane delicate; 2 flagella 2-5 times body length; a 

 chromatophore; wdthout pyrenoid or stigma; contractile vacuole 

 anterior; nucleus central; fresh water. 



S. complanata W. (Fig. 90, n). 5.2-5.7 /j. by 4.4-4. 6^; fresh water. 



Genus Thorakomonas Korschikoff. Flattened; somewhat ir- 

 regularly shaped or ellipsoid in front view; membrane thick, 

 enclustered with iron-bearing material, deep brown to black in 

 color; protoplasmic body similar to that of Chlamydomonas; a 

 chromatophore with a pyrenoid; 2 contractile vacuoles; standing 

 fresh water. 



T. sahulosa K. (Fig. 90, o). Up to 16^ by 14/x. 



Genus Coccomonas Stein. Shell smooth; globular; body not 

 filling intracapsular space; stigma; contractile vacuole; asexual 

 reproduction into 4 individuals; fresh water. 



C. orbicularis S. (Fig. 91, a). 18-25/^ in diameter; fresh water. 



Genus Chlorogonium Ehrenberg. Fusiform; membrane thin 

 and adheres closely to protoplasmic body; plate-like chromato- 

 phores usually present, sometimes ill-contoured; one or more 



