298 BIOLOGY OF THE PROTOZOA 



III. KEY TO COMMON GENERA OF MASTIGOPHORA. 



Flagellates colored by chlorophyll and their color- 

 less relations; vacuoles simple or complex 



Class 1. Phytomastigoda 



Flagellates without chlorophyll or relation to chlo- 

 rophyll-bearing forms Class 2. Zoomastigoda 



Class I. PHYTOMASTIGODA, Dofleix. 



1 . Without cellulose shell, furrow, or transverse 



flagellum 2 



With cellulose shell, transverse flagellum 



and furrow Order 3. Dinoflagellida 



2. Chlorophyll yellow or browni; vacuoles 



simple 3 



Chlorophyll green; vacuoles simple or 

 complex 4 



3. Gullet absent; cells not flattened. .Order 1. Chrysomonadida 

 Gullet present; cells usually flattened 



Order 2. Cryptomonadida 



4. Cellulose membrane; no gullet; vacuole 



simple Order 4. Phytomonadida 



With gullet; vacuole system complex 5 



5. Metabolic products paramylum . . . Order 5. Euglenida 

 Metabolic products oil Order 6. Chloromonadida 



Order I. CHRYSOMONADIDA. 



1. Motionless stage dominant or permanent 2 



Motile stage dominant Sub-order 1. Euchrysomonadina 



2. No flagella known; rhizopodia forms 



Sub-order 2. Rhizochrysidina 

 Palmella-stage dominant Sub-order 3. Chrysocapsina 



Sub-order 1. Euchrysomonadina. 



With one apical flagellum Family 1. Chromulinid.^ 



With two, equal, apical flagella .... Family 2. Isochrysid.e 

 With two, unequal, apical flagella. .Family 3. Ochromonadid.e 



With calcareous discs and rods Family 4. Coccolithophorid.e 



With simple or fenestrated skeleton . Family 5. Silicoflagellid.e 



Family 1. Chromulinidae. 



1. Chromatophores indefinite or network 



Tribe 1. Chrysapsidin.e 

 Chromatophores definitely formed 2 



2. Test if present, simple, not sculptured 



Tril)e 2. Euchromulinid^ 

 Test sculptured: vacuole simple or double 



Tribe 3. Mallomonadid.e 

 Tribe 1. Chrysapsidin^e. 



One genus with tribal characteristics . . Genus Chrysapsis 

 Tribe 2. Euchromulinid.e 



1. With marginal tentacles; truncate 



Sub-famil}^ 1. Crytophorin^ 

 No marginal tentacles 2 



2. Naked; without test or house 3 



With test or house 4 



