300 BIOLOGY OF THE PROTOZOA 



Band-form colonies; cells triangular, broad 



at base Genus Chloi'ode.wncs 



Family 3. Ochromonadidse. 



Cells naked, solitary or colonial . Sub-familj^ 1. Ochromonadin.e 

 With tests, tests often complex. Sub-family 2. Lepochromonadin^ 



Sub-family 1. Ochromonadina; 



1 . Solitary forms 2 



Colonial forms 3 



2. Colorless forms with stigmata Genus Hcterochromonas 



With chromatophores , usually without 



stigmata Genus Ochrornonos 



3. Colonies globular or ellipsoidal 4 



Colonies wheel or funnel-shape Genus Cyclonexis 



4. Cells peripheral, no inner processes, irreg- 



ular Genus Uroglenopsis 



Cells fixed by inner gelatinous, branched, 

 processes Genus Uroglena 



Sulvfamily 2. Le-pochromonadinm 



1. Tests with external markings or processes 



Genus Hyulohryon 

 Tests simple , no markings or processes ... 2 



2. Free-swimming forms 3 



Attached forms 5 



3. Cell at base of cup, no stalk 4 



Stalk of cell attached to base of cup 



Part of Genus Dlnobryon 



4. Test keg-shape with cross constrictions 



Genus Pseudoke'phyrion 

 Test oval or ellipsoid ; no cross constrictions 



Genus Kephyriopsis 



5. Tests with long, often delicate, stalks 6 



Tests without stalks; cells with contractile 



stems Genus Dinobryon 



6. Tests globular or vase-shape; cells at 



bottom Genus Stylopyxis 



Tests beaker-shape , narrow ; cells at mouth 



Genus Poteriochromonas 

 Family 4. Coccolithophoridse. 



Shell plates are unperforated discs (dis- 



coliths) Sub-family 1 . Syracosph^erin^ 



Shell plates are perforated (tremaliths) 



Sub-family 2. Cgccolithophgrin.e 



Sub-family 1. Syracosphcerinoe 



1. Discs without spinous floating processes. . . 2 

 Discs with spinous processes 3 



2. Cells with one flagellum Genus Pontosphcera 



Cells with two equal fiagella Genus Syracosphcera 



3. Body covered with disc-plates 4 



Body plates absent, long floating processes 



Genus Halopappus 



4. Equatorial plates not modified as floats 



Genus Michaelsarsia 

 Equatorial plates modified as floats 5 



5. Equatorial processes beaker-shape . . Genus Syracosphoera 

 Floating processes horn-shape Genus Torosphwra 



