248 



FRESH-WATER BIOLOGY 



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

 Representative species Anthophysa vegetans Miiller 1786. 



Bodies attached in rosette-like clusters, each zooid pyriform 

 in shape, obliquely 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 ft. In stagnant water. 



FIG. 378. Anthophysa vegetans. X 500. (After Muller.) 



36(3) Sometimes plastic but not producing pseudopodia. . 37 



37 (60) Chromatophores not present; flagella often numerous. .... 38 



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



Order Heteromastigida . . 39 



39 (40) Flagella three in number, one directed forward. . . EMrea Parona. 



Representative species Elvirea cionae Parona 1886. 



Body ovate to elongate, laterally compressed. The shorter 

 flagellum directed forward. Mouth and nucleus anterior. 

 Fresh water. 



FIG. 379. EMrea cionae. X 1200. (After Conn.) 



40 (39) Flagella two in number , 41 



41 (42) Both directed forward Dinomonas Kent. 



Representative species Dinomonas wrax Kent 1880. 



Body persistent in shape, subpyriform, widest posteriorly, 

 slightly curved. Flagella subequal, longer than the body. 

 Length 15/1. Hay infusions. 



FIG. 380. Dinomonas wrax. X 1000. (After Conn.) 



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



43 (46) Body spiral or oblique 44 



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



Phyllomitus Stein. 

 Representative species. . . . Phyllomitus amylophagus Klebs 1886. 



FIG. 381. Phyllomitus amylo 

 (After Conn. 



X I37S- 



