308 BIOLOGY OF THE PROTOZOA 



Class II. ZOOMASTIGODA. 



1. With flagella and pseudopodia . . . .Order 1. Pantastomatida 

 No pseudopodia; with or without mouth. . 2 



2. With one or two primary flagella . Order 2. Protomastigida 

 With more than two flagella 4 



3. Not more than eight flagella except in 



Calonymphidse Order 3. Polymastigida 



More than eight flagella Order 4. Hypermastigida 



Order I. PANTASTOMATIDA. 



Cells polyaxonic; with many flagella Family 1. Holomastigid^ 

 Cells monaxonic; one to three, rarely four, 



flagella Family 2. Rhizomastigid^e 



Family 1. Holomastigidae. 



One genus with the characters of the family 



Genus Mullicilia 

 Family 2. Rhizomastigidse. 



1. Flagellum base with ring of pseudopodia 



Genus Pteridomonas 

 Flagellum base without pseudopodia 2 



2. Individuals with stalk; pseudopodia ray- 



like. Genus Adinomonas 

 Individuals without stalks 3 



3. Pseudopodia if present, without axial fila- 



ments 4 



Pseudopodia with axial filaments. . .Genus Dimorpha 



4. Usually one swimming flagellum 5 



One swimming, one trailing flagellum 7 



5. Cytoplasmic axial rod absent 6 



Cytoplasmic axial rod present Genus Cercomastix 



6. Flagellum rises from the nucleus .... Genus Mastigamceha 

 Flagellum rises independently of the nucleus 



Genus Mastigella 



7. Anterior end with trough-like depression 



Genus Bodopsis 

 Anterior end without depression .... Genus Cercobodo 



Order II. PROTOMASTIGIDA. 



1. One flagellum only 2 



Two flagella 6 



Three flagella; one swimming, two trailing 



Family 1. Trimastigid^ 



2. Protoplasmic collar absent 3 



Protoplasmic collar present 5 



3. Tentacle-like process absent 4 



Tentacle-like process present . . . Family 2. Biccecid^ 



4. Undulating membrane absent. . .Family 3. Oicomonadid.e 

 Undulating membrane present; internal 



parasites Family 4. Trypanosomatid.e 



5. Collar never enclosed in jelly. . . .Family 5. Choanoflagellid.'E 

 Collar entirely enclosed in jelly. .Family 6. Phalansteriid.e 



6. Undulating membrane present; parasites 



Family 7. Cryptobiid^ 

 Undulating membrane absent 7 



