SA R CO DIN A , PRO TEO M YXA 



179 



The latter are biflagellated, seek a new host, and transform them- 

 selves into amoeboid stages. Encystment common. 



Pseudospora volvocis Cienkowski (Fig. 67,/, g). Parasitic in 

 species of Volvox. Body diameter about 12 to 30 microns. 



Pseudospora parasitica Cienkowski. Attacks Spirogyra and 

 allied algae. 



Pseudospora eudorini Roskin. Parasitic in Eiidorina elegans. 



Genus Protomonas Cienkowski. Body irregularly rounded 

 with radiating filopodia. Food consists of starch grains. Divi- 

 sion into biflagellate swarmers which become amoeboid and 

 unite to form pseudoplasmodium. Fresh or salt water, 



Protomonas amyli Cienkowski (Fig. 67, h-j). In fresh water. 



Fig. 67 a. Lahyrinthula cienkowskii. X about 150 (After Doflein). 



b-e. Labyrinthomyxa sauvageaid. (After Duboscq). b, c, small and 

 large flagellated forms inlife (X750); d,e,pseudoplasmodia formed 

 by fusiform bodies and large amoebae (stained, X375). 



f, g. Pseudospora volvocis. X500 (After Robertson). 



h-j. Protomonas amyli. (After Zopf). h, amoeba; i, flagellate phase; 

 j, cyst. 



Family 3 Vampyrellidae Doflein 



Filopodia radiate from all sides or formed from a limited 

 area of the body. Flagellate swarmers absent. The organisms are 

 able to bore through, by secreting probably a specific enzyme, 

 the cellulose membrane of various algae and engulf the proto- 

 plasmic contents. The metabolic products of chlorophyll 

 substance appear as carotin, a reddish substance, in the form of 



