PHYTOMONADINA 279 



B. westiana Pascher (Fig. 112, i). 15-24/t by 13-23/z; brackish 

 water. 



Genus Lobomonas Dangeard. Ovoid or irregularly angular; chro 

 matophore cup-shaped; pyrenoid; stigma; a contractile vacuole, 

 fresh water. 



L. rostrata Hazen (Fig. 112, j). 5-12 /i by 4-8 /*. 



Genus Diplostauron Korschikoff. Rectangular with raised cor- 

 ners; 2 equally long flagella; chromatophore; one pyrenoid; stigma; 

 2 contractile vacuoles anterior; fresh water. 



D. pentagonium (Hazen) (Fig. 112, k). 10-13/* by 9— 10m- 



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 woodland pools. 



G. permaxima P. (Fig. 1 12, 1). 70-150/* by 40-80/x 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; 

 pyrenoids (?); stigma; 2 contractile vacuoles anterior; freshwater. 



G. ovalis K. (Fig. 112, m). 38-42/x by 23-33/*; gelatinous envelope 

 over 2/* thick. 



Genus Scourfieldia West. Whole body flattened; ovoid in front 

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

 matophore; without pyrenoid or stigma; contractile vacuole anter- 

 ior; nucleus central; fresh water. 



S. complanata W. (Fig. 112, n). 5.2-5. 7/* by 4. 4-4. 6m ; fresh water. 



Genus Thorakomonas Korschikoff. Flattened; somewhat irregu- 

 larly shaped or ellipsoid in front view; membrane thick, enclustered 

 with iron-bearing material, deep brown to black in color; proto- 

 plasmic body similar to that of Chlamydomonas; a chromatophore 

 with a pyrenoid; 2 contractile vacuoles; standing fresh water. 



T. sabulosa K. (Fig. 112, o). Up to 16// by 14/*. 



Genus Coccomonas Stein. Shell smooth; globular; body not filling 

 intracapsular space; stigma; contractile vacuole; asexual reproduc- 

 tion into 4 individuals ; fresh water. Species (Conrad 1930). 



C. orbicularis S. (Fig. 113, a). 18-25/1 in diameter; fresh water. 

 Genus Chlorogonium Ehrenberg. Fusiform; membrane thin and 



adheres closely to protoplasmic body; plate-like chromatophores 

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

 numerous scattered contractile vacuoles; usually a stigma; a central 

 nucleus; asexual reproduction by 2 successive transverse fissions 



