310 BIOLOGY OF THE PROTOZOA 



9. Cells attached Genus Salpingoeca 



Cells f ree-swimniing Genus Lagenoeca 



10. Individuals without test 11 



Individuals with delicate test Genus Diplosigopsis 



11. Individuals sessile or with short stalk 



Genus Diplosiga 

 Individuals with very long stalk .... Genus Codonosigopsis 

 Family 6. Phalansteriidae. 



One genus only Genus Phalansterium 



Family 7. Cryptobiidae. 



Without skeletal bars Genus Cryptobia 



With skeletal bars Genus Trypanophis 



Family 8. Amphimonadidse. 



1 Individual without tubes, tests, or jelly. . . 2 

 Individuals in tubes, tests or jelly 4 



2. Cells without keels or ridges 3 



Cells with lateral keels Genus Streptomonas 



3. Cells ovoidal, spindle-shape or spherical 



Genus Amphimonas 

 Cells horse-shoe-shape or spiral 5 



4. Cells in stalked test Genus Diplomita 



Cells in gelatinous masses or in tubes 6 



5 . Cells horse-shoe-shape Genus Purcilla 



Cells spirally twisted Genus Spiromonas 



6. Cells in gelatinous masses Genus Spongomonas 



Cells in gelatinous tubes 7 



7. Tubes not united laterally Genus Cladomonas 



Tubes fused lengthwise (organ-pipe forms) 



Genus Rhipidodendron 

 Family 9. Monadidse. 



1. Individuals solitary 2 



Individuals colonial 5 



2. Without tests 3 



With tests Genus Stokesiella 



3. Surface smooth 4 



Surface covered with slime and radial 



threads Genus Physomonas 



4. Both flagella active Genus Monas 



Primary flagellum rigid Genus Sterromonas 



5. Individuals with test Genus Stylobryon 



Individuals without test 6 



6. Cells solitary at ends of branched stalks 



Genus Dendromonas 

 Cells colonial at ends of branched stalks . . 7 



7. Stalks colorless, rigid Genus Cephalothamnlum 



Stalks yellow or brown ; plastic Genus Anthophysa 



Family 10. Bodonidse. 



1. Two unequal swimming flagella. . . .Genus Dinomonas 

 One swimming flagellum 2 



2. One swimming, one trailing, or feeding, 



flagellum 3 



Main flagellum replaced by movable pro- 

 boscis Genus Rhynchonionas 



3. Parasitic; parabasal body present. . .Genus Prowazekella 

 Parabasal body absent 4 



