MORPHOLOGY AND TAXONOMY OF MASTIGOPHORA 309 



7. Flagella of dissimilar length 8 



Flagella of similar length Family 8. Amphimonadid.e 



8. One primary flagellum, one secondary 



Family 9. Monadid.e 

 One primary flagellum, one trailing 



Family 10. Bodonid^ 



Family 1. Trimastigidae. 



Trailing flagella arise from anterior tip . . Genus Macromastix 

 Trailing flagella arise below anterior tip 



Genus Dallingeria 

 Family 2. Bicoecidae. 



1. Peristomial region thin, skin-like 2 



Peristomial region thick, proboscis-like 



Genus Poteriodendron 



2. Individuals attached by contractile stalk 



Genus Bicoeca 

 IndiA'iduals without contractile stalk Genus Histiona 

 Family 3. Oicomonadidae. 



1. One swimming flageUum 2 



One trailing flagellum Genus Ancyromonas 



2. No cytostome, free-living Genus Oicomonas 



With cytostome. free-living or parasitic. . . 3 



3. Free-living; mouth small with gullet Genus Thylacomonas 

 Parasitic in digestive tract 4 



4. With parabasal body Genus Leptomonas 



Without parabasal body 5 



5. Lumen-dwelling; no intracellular stage 



Genus Rhizomastix 

 With intracellular- non-flagellated stage 



Genus Leishmania 

 Family 4. Trypanosomatidse. 



Undulating membrane extends down the body 



Genus Trypanosoma 

 Undulating meml^rane at base of flagellum 



only Genus Crithidia 



Family 5. Choanoflagellidse. 



1. With one protoplasmic collar 2 



With two protoplasmic collars (?) 10 



2. Without test or shell 3 



With test or shell .^ 9 



3. Individuals not embedded in jelly 4 



All but collar enclosed in jelly; colonial. . . 8 



4. Solitary; short stalked or sessile. . . .Genus Monosiga 

 Branched or otherwise colonial; not sessile 5 



5. Stalks attached; individuals clustered at 



ends 6 



Individuals in free-swimming colonies .... 7 



6. Stalk not branched Genus Codonosiga 



Stalk branched Genus Codonocladinm 



7. Colonies stellate Genus Astrosiga 



Colonies band-form, simple or branched 



Genus Desmarella 



8. Individuals without stalks; irregularly 



placed Genus Proterospongia 



Individuals with stalk, radially arranged 



Genus Sphceroica 



