430 BIOLOGY OF THE PROTOZOA 



Order 2. POLYMASTIGIDA. 



Sub-order 1. Monokaryomastigina. 

 Key to Families. 



1 . Bodj' not spirally wound (see exception in 



Family 2) . . . *. 2 



Body spirally wound or with spiral stripes . 8 



2. Cy tostome, if present, not sucker-like .... 3 



With sucker-like cytostome Family 9. Cochlosomidab 



3. Without trailing flagellum 4 



With trailing flagellum 6 



4. Flagella six or more in number 5 



Flagella less than six in number. .Family 3. Tetramitidae 



5. Flagella grouped 1 Family 1. Callimastigidae 



Flagella distributed over body. Family 2. Dinenymphidae 



6. With undulating membrane. . . .Family 4. Trichomonadidae 

 Without undulating membrane 7 



7. Without cytostome Family 5. Devescovinidae 



With definite cytostome Family 6. Chilomastigidae 



8. Flagella four or more in number; anterior 



Family 8. Streblomastigidae 

 Flagella twelve or more in number; lateral 



Family 7. Spironemidae 



Key to Genera. 



Family 1. Callimastigidae da Fonseca. 



Body spherical Genus Callimastix Weissenberg 



Body watch-glass shape Genus Selenomonas Prowazek 



Familv 2. Dinenymphidae Grassi. 



1. With axostyle 2 



Without axostyle. . . (Questionable) Genus Rhynchodinium 



Da Cunha and Penido 



2. Many flagella in spiral rows Genus Dinenympha Leidy 



Four to eight flagella leaving body at pos- 

 terior end Genus Pyrsonympha Leidy 



Family 3. Tetramitidae Biitschli. 



1. Four flagella in one group 2 



Four flagella in two groups 4 



2. With axial fibril (coprozoic forms) ( lenus Copromastix Aragao 

 Without axial thread 3 



3. With cytostome Genus Tetramitus Perty 



Without cytostome, pseudopodial feci li ag 



( renus Collodictyon Carter 



4. Axostyle extends to posterior end . . .Genus Monocercomonas Grassi 

 Axostyle does not run to posterior end; 



body ridged Genus Polymastix Biitschli 



Familv 4. Trichomonadidae Wenyon(?) 



1. With axostyle * 2 



Without axostyle Genus Trichomitus 



Kofoid and Swezy 



1 Genus Hegneiia, Brumpt and Lavier, with 7 flagella; like Euglena bin color- 

 less and no stigma. 



