250 FRESH-WATER BIOLOGY 



52 (51) Body not laterally expanded, sometimes attached by a stalk. Flagella 



arising from the anterior end. . . Amphimonas Dujardin. 



Representative species Amphimonas globosa Kent 1880. 



Body subspherical, attached by a. filamentous pedicel. Flagella equal, twice the 

 length of the body. Diameter 12^. Pond water. 



Fig. 386. Amphimonas globosa. X 875. (After Kent.) 



Conn reports a form, found abundantly in the fresh waters of Connecticut, which 

 he assigns to this genus, with some doubt. Although never attached by a pedicel, 

 the two equal flagella would seem to place it here. 



S3 (so) Flagella four in number 54 



54(55) With a deep, vertical furrow Collodictyon Caxtet. 



55 (54) Without a vertical furrow 56 



56 (57) With three flagella directed forward, one trailing. Body pear-shaped, 



rounded in front, acute behind. . Trichomastix Blochmann. 

 Representative species Trichomastix sp. 



American species observed have not been de- 

 termined. 



Fig. 387. Trichomastix sp. X 750. (After Conn.) 



57 (56) With all four flagella directed forward 58 



58 (59) Body ellipsoidal, with two thread-Uke processes at the posterior 



end. Hexamita Dujardin. 



Representative species Hexamita inflata Dujardin 1838. 



Body plastic, posterior end bifid, giving rise to the trailing, flagella-like 

 processes by means of which it may be temporarily fixed. Length 10 to 

 IS (1. Pond water and infusions. 



Flo. 388. Sexamila inflata. X 875. (After Conn.) 



