EUGLENOIDINA 213 



H. mutabile (Stokes) (Fig. 97, I). Elongate; highly ])Iastic; 

 longitudinally striated; about 254/i long; in cypress swamp. 



Genus Tropidoscyphus Stein. Slightly plastic; pellicle with 8 

 longitudinal ridges; 2 unequal flagella at anterior pole; holozoic 

 or saprozoic; fresh or salt water. 



T. octocostatus S. (Fig. 97, m). 35-63/^ long; fresh water, rich in 

 vegetation. 



Genus Distigma Ehrenberg. Plastic; elongate when extended; 

 body surface without any marking; 2 flagella unequal in length, 

 directed forward; cytostome and cytopharynx located at anterior 

 end; endoplasm transparent; holozoic. One species. 



D. proteus E. (Fig. 97, n). 50-1 10/z long when extended; nu- 

 cleus central; stagnant water; infusion. 



Genus Entosiphon Stein. Oval, flattened; more or less rigid; 

 flagella arise from a cytostome, one flagellum trailing; protrusible 

 cytopharynx a long conical tubule almost reaching posterior end ; 

 nucleus centro-lateral; fre>sh water. 



E. sulcatum (Dujardin) (Fig. 97, o). About 20// long. 



E. ovatum Stokes. Anterior end rounded; 10-12 longitudinal 

 striae; about 25-28/z long. 



Genus Notosolenus Stokes. Free-swimming; rigid oval; ventral 

 surface convex, dorsal surface with a broad longitudinal groove; 

 flagella anterior; one long, directed anteriorly and vibratile; the 

 other shorter and traihng; fresh water with vegetation. 



N. apocamptus S. (Fig. 97, p). Oval with broad posterior end; 

 6-1 1m long. 



N. sinuatus S. (Fig. 97, q). Posterior end truncate or concave; 

 about 22/x long. 



Genus Marsupiogaster Schewiakoff. Oval; flattened; asym- 

 metrical; cytostome occupies entire anterior end; cytopharynx 

 conspicuous, 1/2 body length; body longitudinally striated; 2 

 flagella, one directed anteriorly, the other posteriorly; spherical 

 nucleus; contractile vacuole anterior; fresh or salt water. 



M. striata Schewiakoff (Fig. 97, r). About 27 fi by IS/x; fresh 

 water; Hawaii. 



M. picta Faria, da Cunha et Pinto (Fig. 97, s). In salt water; 

 Rio de Janeiro. 



Order 5 Chloromonadina Klebs 

 The chloromonads are of rare occurrence and consequently not 



