426 BIOLOGY OF THE PROTOZOA 



Family 7. Amphimonadidae. 



8. Colonies laterally associated tubes — organ- 

 pipe type Genus Rhipidodendron Stein 



Colonies branched Genus Cladomonas Stein 



Family 8. Monadidae Stein. 



1. Individuals solitary 2 



Colony-forming 5 



2. Naked forms 3 



Cup-dwelling Genus Stokesiella Lemmermann 



3. Stalked; slime-covered; radial striations in 



slime Genus Physomonas S. Kent 



Free-swimming ; not stalked 4 



4. Both flagella active Genus Monas Ehr. 



Main flagellum stiff, anteriorly directed 



Genus Sterromonas S. Kent 



5. Monads in cups; colony branched. .Genus Stylobryon Fromentel 

 Monads not in cups 6 



6. Single cells at ends of branched stems 



Genus Dendromonas Stein 

 Groups of cells (corbels) at ends of 

 branched stems 7 



7. Stalks colorless Genus Cephalothamnium Stein 



Stalks colored yellow or brown Genus Anthophysa Bon- 

 Family 9. Bodonidae Blitschli. 



1. Trailer not united with periplast to form 



undulating membrane 2 



Undulating membrane present — parasites . 18 



2. One flagellum modified as a proboscis 



Genus Rhynchomonas Klebs 

 Both flagella active 3 



3. Individual metabolic 4 



Individual rigid 12 



4. With marginal bristles; occasional 



branched pseudopodia Genus Thaumatomastix 



Lauterborn 

 Without marginal bristles 5 



5. With ventral furrow 



No ventral furrow, cytostome apical or 



absent 8 



6. Flagella united at base by membrane 



Genus Phyllomitus Stein 

 Flagella not united by membrane 7 



7. Trailer short, rarely extending beyond fur- 



row (parasitic) Genus Embadomonas Mackinnon 



Trailer long, extending through furrow 



beyond posterior end Genus Colponema Stein 



8. Trailer used as gliding flagellum Genus Bodo (Ehr.) Stein 



Trailer not a glider 9 



9. Trailer used for attachment Genus Pleuromonas Perty 



Trailer free 10 



10. Parasitic Genus (Prowazekella) Proteromonas Kunstler 



In stagnant waters — not parasitic 11 



11. With apical cytostome Genus Heteronema Dujardin 



Without cytostome Genus Dinomonas S. Kent 



