FLAGELLATE PROTOZOA (MASTIGOPHORA) 



249 



45 (44) Body spiral, elongated Spiromonas Perty. 



Representative species. . . Spiromonas angusta Dujardin 1841. 



Body five or six times as long as broad. Fla- 

 gella subequal, as long as the body, one directed 

 forward; body sometimes temporarily attached 

 by one. Length 10 n. Hay infusions. 



Fig. 382. Spiromonas angusla. X looo. (After Conn.) 

 There is doubt as to the identity of Conn's form. 



46 (43) Body neither spiral nor oblique 47 



47 (48) Kidney-shaped to spherical; flagella arising from a ventral depres- 

 sion, one trailing. Food absorbed by a dorsal vacuole. 



Pleuromonas Perty. 

 Representative species Pleuromonas jaculans Perty 1852. 



Body kidney-shaped, very small; sometimes attached by the pos- 

 terior flagellum. Contractile vacuole anterior; nucleus posterior. 



Length s to g ^. Stagnant water and infusions. Movements 

 jerking and leaping. 



Fig. 383. Pleuromonas jaculans. X looo. (After Conn.) 



(47) Pear-shaped to spindle-shaped; flagella arising from the anterior 

 end, one trailing. Food not taken in by a dorsal vacuole. 



Heteromita Dujardin. 

 Representative species. . . Heteromita ovata Dujardin 1841. 



Body ovate, widest posteriorly. Flagella unequal, the 

 trailing one twice as long as the anterior one. Length 

 25 to 40 fi. River water with aquatic plants. 



Fig. 384. Heteromita ovata. X 500. (After Conn.) 



49 (38) Flagella usually numerous, frequently arranged in groups. 



Order Phytomastigida 



SO 



S° (53) Flagella two in number 51 



51 (52) Body expanded into two wings; flagella long. 



Trepomonas Dujardin. 

 Representative species Trepomonas agilis Dujardin 1841. 



Very irregular in shape, different appearances being presented 

 from different points of view. The broad, wing-like lateral lobes 

 curve backward nearly to the middle of the body. Length 20 /*. 

 Pond water. 



Fig. 385. Trepomonas agilis. X 4S0. (After Conn.) 



