PHYTOMONADINA 283 



P. montana Geitler. Bluntly conical; anterior end 4-lobed or 

 truncate; posterior end narrowly rounded; plastic; pyriform nucleus 

 anterior, closely associated with 4 flagella; stigma; 2 contractile 

 vacuoles anterior; chromatophore cup-shaped, granular, with scat- 

 tered starch grains and oil droplets ; a pyrenoid with a ring of small 

 starch grains; 17-22.5/1 long (Geitler, 1925); 12-20/* by 8-16/* 

 (Bold); flagella about body length; fresh water, Maryland (Bold, 

 1938). 



Genus Polytomella Aragao. Ellipsoid, or oval, with a small papilla 

 at anterior end, where 4 equally long flagella arise ; with or without 

 stigma; starch: fresh water (Aragao, 1910; Doflein, 1916). 



P. agilis A. (Fig. 114, c, d). Numerous starch grains; 8—18/* by 

 5-9/*; flagella 12-17/* long; fresh water; hay infusion. 



P. caeca Pringsheim. Ovoid with bluntly pointed posterior end; 

 12-20/* by 10-12/*; membrane delicate; a small papilla at anterior 

 end; no stigma; two contractile vacuoles below papilla; cytoplasm 

 ordinarily filled with starch grains; fresh water (Pringsheim, 1937). 



Genus Medusochloris Pascher. Hollowed hemisphere with 4 proc- 

 esses, each bearing a flagellum at its lower edge; a lobed plate- 

 shaped chromatophore; without pyrenoid. One species. 



M. phiale P. In salt water pools with decaying algae in the Baltic. 



Genus Spirogonium Pascher. Body spindle-form; membrane deli- 

 cate; flagella a little longer than body; chromatophore conspicuous; 

 a pyrenoid; stigma anterior; 2 contractile vacuoles; fresh water. One 

 species. 



S. chlorogonioides (P). (Fig. 114, e). Body up to 25/* by 15/*. 



Genus Tetrablepharis Senn. Ellipsoid to ovoid; pyrenoid present; 

 fresh water. 



T. multifilis (Klebs) (Fig. 114,/). 12-20/* by 8-15/*; stagnant water. 



Genus Spermatozopsis Korschikoff. Sickle-form; bent easily, oc- 

 casionally plastic; chromatophore mostly on convex side; a distinct 

 stigma at more rounded anterior end; flagella equally long; 2 con- 

 tractile vacuoles anterior; fresh water infusion. 



S. exultans K. (Fig. 114, g). 7-9/* long; also biflagellate ; in fresh 

 water with algae, leaves, etc. 



Family 4 Chlorasteridae 



Genus Chloraster Ehrenberg. Similar to Pyramimonas, but an- 

 terior half with a conical envelope drawn out at four corners; with 5 

 flagella; fresh or salt water. 



C. gyrans E. (Fig. 114, h). Up to 18/* long; standing water; also re- 

 ported from salt water. 



