248 



FRESH-WATER BIOLOGY 



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

 Representative species Anthophysa vegetans M.\i\[er I'jZt. 



Bodies attached in rosette-like clusters, each zooid pyriform 

 in shape, ohUqucly truncate in front, with two lla^ella 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 m- In stagnant water. 



Fig. 378. Anthophysa vegetans. X 500. (.\fter Miiller.) 



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. . . Elvirea 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. Elvirea cionae. x 1200. (After Conn.) 



40 (39) Flagella 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 siibequal, longer than the body. 

 Length 15 ^l. Hay infusions. 



Fig. 380. Dinomonas vorax. 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 obhque; very flexible. 



PhyUomitus Stein. 

 Representative species. . . . PhyUomitus amylophagus Klebs 1886. 



.~ \--'o'(^ "-"*'«» v-V'.'".Sf3 Fig. 381. PhyUomitus amylophagus. X 137 = 



:^f^_2^ \J,jf^^^X2):£^ (After Conn.) 



