248 FRESH-WATER BIOLOGY 



35 (34) Stalk long, stout, greatly branched. Anthophysa Bory de St. Vincent. 



Representative species. . . Anthophysa vegetans MuWer lySt. 



Bodies attached in rosette-like clusters, each zooid pyriform 

 in shape, obUquely truncate in front, with two flagella of un- 

 equal length. Clusters attached to a branched pedicel or 

 free swimming, moving through the water in a rolling motion. 

 In older stages the pedicel becomes dark brown in color. 

 Length of zooid 5 to 10 ji. In stagnant water. 



Fig. 378. Anthophysa vegetans. X 500. (After Miiller.) 



36 (3) Sometimes plastic but not producing pseudopodia 37 



37 (60) Chromatophores not present; flageUa often numerous 38 



38 (49) Flagella usually two, one usually trailing; very minute forms. 



Order Heteromastigida . . 39 



39 (40) FlageUa three in number, one directed forward. . Elvirea Parona. 



Representative species. . , . Elvirea cionae Parona 1886. 



Body ovate to elongate, laterally compressed. The shorter 



" " ^ /^^ ^i^iijJi M ^ flagellum directed forward. Mouth and nucleus anterior. 



"^ ^ ^ F^ Fresh water. 



Fig. 379. Elvirea cionae. X 1200. (After Conn.) 



40 (39) FlageUa two in number 41 



41 (42) Both directed forward Dinomonas Kent. 



Representative species Dinomonas vorax Kent 1880. 



Body persistent in shape, subpyriform, widest posteriorly, 

 slightly curved. Flagella subequal, longer than the body. 

 Length 15 /*. Hay infusions. 



Fig. 380. Dinomonas vorax. X 1000. (After Conn.) 



42 (41) One flagellum traUing, the other directed forward 43 



43 (46) Body spiral or obUque 44 



44 (45) Body not spiral, anterior end obUque; very flexible. 



Phyllomitus Stein. 

 Representative species. . . . Phyllomitiis amylophagus Klebs 1886. 



Fig. 381. PhyUomitus amylophagus. X 1375. 

 (After Conn.) 



