The Mastigophora 125 



Fig. 4. 7. A. Cyst of Cladonema pauper urn; diagrammatic (after 

 Pascher). B. Cvst of Ochromouas reptans; x2250 (after Conrad). C. Cyst of 

 Cellionella palensis; diagrammatic (after Pascher). D-F. Dinohryon diver- 

 gens; completion of nuclear division (D) is sometimes followed li\ encvst- 

 ment (E) to produce a binucleate cyst (F); xl2I0 (after Geitler). G. Cvst of 

 Ochromonas ludibunda: xl500 (after Conrad). H-J. Stages in development 

 of the cyst wall in Uragleiia snniara; diagrammatic (after Conrad). 



Suborder 1. Euchrysomonadina. On the basis of flagellar equipm-nt 

 four families have been erected: Chromulinidae, with one flagelltun. 

 Syncryptidae, with two equal flagella; Ochromonadidae, with one long 

 and one short fiagellum; and Prymnesiidae, with three flagella. 



Family 1. Chromulinidae. This group includes solitary and colonial 

 types. The type genus, Chromulina Cienkowski (67), contains small 

 naked flagellates with one band-like chromatophore or two smaller ones 

 (Fig. 4. 1, B, F). Amoeboid changes in form are observed in some species. 



Solitary types without a lorica or test are assigned to Chromulina and several addi- 

 tional genera: Amphichrysis Korshikoff (165); Chrysapsis Pascher (202; Fig. 4. 1, H, I); 



