306 PROTOZOOLOGY 



surface convex, dorsal surface with a broad longitudinal groove; 

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

 other shorter and trailing; fresh water with vegetation. 



iV. apocamptus S. (Fig. 123, j). Oval with broad posterior end; 

 6-1 1/x long. 



N. sinuatus S. (Fig. 123, h). Posterior end truncate or concave; 

 about 22/t long. 



Genus Triangulomonas Lackey. Rigid body, triangular, with con- 

 vex sides; one surface flat, the other elevated near the anterior end; 

 pellicle brownish; a mouth at anterior end with cytopharynx and 

 reservoir: two flagella, one trailing; salt water. 



T. rigida L. (Fig. 123, I, m). Body 18m by 15/z; anterior flagellum 

 as long as the body; posterior flagellum 1.5 times the body length; 

 Woods Hole (Lackey, 1940). 



Genus Marsupiogaster Schewiakoff. Oval; flattened; asymmet- 

 rical; cytostome occupies entire anterior end; cytopharynx con- 

 spicuous, 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. 123, n). About 27/x by 15/x; fresh 

 water; Hawaii. 



M . picta Faria, da Cunha and Pinto (Fig. 123, o). 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- 

 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. Genera (Poisson and Hollande, 1943; Hol- 

 lande, 1952). 



Genus Gonyostomum Diesing (Rhaphidomonas Stein). With a sin- 

 gle flagellum: chromatophores grass-green; highly refractile tricho- 

 cyst-like bodies in cytoplasm ; fresh water. A few species. 



G. semen D. (Fig. 124, a). Sluggish animal; about 45-60/x long; 

 among decaying vegetation. 



Genus Vacuolaria Cienkowski (Coelomonas Stein). Highly plastic; 

 without trichocyst-like structures; anterior end narrow; two flag- 

 ella; cyst with a gelatinous envelope. One species. 



V. virescens C. (Fig. 124, 6). 50-70 M by 18-25/*; fresh water. Cy- 

 tology (Fott, 1935; Poisson and Hollande, 1943). 



