EUGLENOIDINA, CHLOROMONADINA 



243 



M. picta Faria, da Cunha and Pinto (Fig. 103, s). In salt water; 

 Rio de Janeiro. 



Order 5 Chloromonadina Klebs 



The chloromonads are of rare occurrence and consequently not 

 well known. The majority possess small discoidal grass-green chro- 



FiG. 104. a, Gonyostomum semen, X540 (Stein); b, Vacuolaria virescens, 

 X460 (Senn);c, Trentonia flagellata, X330 (Stokes); d, Thaumatomastix 

 setifera, X830 (Lauterborn). 



matophores with a large amount of xanthophyll which on addition 

 of an acid become blue-green. No pyrenoids occur. The metabolic 

 products are fatty oil. Starch or allied carbohydrates are absent. 

 Stigma is also not present. 



Genus Gonyostomum Diesing (Rhaphidomonas Stein). With 

 grass-green chromatophores; highly refractile trichocyst-like struc- 

 tures in cytoplasm; in fresh water. A few species. 



G. semen D. (Fig. 104, a). Sluggish animal; about 45-60^ long; 

 in marshy water among decaying vegetation. 



Genus Vacuolaria Cienkowski. Highly plastic ; without trichocyst- 

 like structures; anterior end narrow; with 2 flagella; cysts with a 

 gelatinous envelope. One species. 



V. virescens. C. (Fig. 104, h). About 50-150)u long; fresh water. 



Genus Trentonia Stokes. Bi-flagellate as in the last genus; but 

 flattened; anterior margin slightly bilobed. One species. 



T. flagellata S. (Fig. 104, c). Slow-moving organism; encystment 

 followed by binary fission; about 60/i long; fresh water. 



