MORPHOLOGY AND TAXONOMY OF THE MASTIGOPHORA 431 



Family 4. Trichomonadidae Wenyon(?) 



2. Flagella less than five 3 



Flagella six in number Genus Peniatrichomonoides Kirby 



3. Parabasal wound around axostyle. .Genus Gigantomonas Dogiel 

 Parabasal not wound around axostyle 



Genus Trichomonas Donne 



Family 5. Devescovinidae. 



1. With four flagella 2 



With more than four flagella Genus Metadevescovina Light 



2. Without axostyle 3 



With axostyle _. . 4 



3. Trailing flagellum leaves body at anterior 



end Genus Retortomonas Grassi 



Trailing flagellum leaves body at posterior 



end Genus Tricercomonas 



Wenyon and O'Connor 



4. Parabasal wound around axostyle. .Genus Devescovina Foa 

 Parabasal rod-like 5 



5. Parabasal a single rod 6 



Parabasal double; two curved rods . . Genus Foaina Janicki 



6. Parabasal closely applied to nucleus . Genus Janickiella 



Duboscq and Grasse 

 Parabasal free from nucleus 7 



7. Trailing flagellum leaves body near ante- 



rior end Genus Paradevescovina Kirby 



Trailing flagellum leaves body near poste- 

 rior end Genus Tricercomitus Kirby 



Family 6. Spironemidae. 



One genus Genus Spironema Klebs 



Family 7. Streblomastigidae. 



One genus Genus Streblomastix 



Kofoid and Swezy 



Family 8. Chilomastigidae. 



1. With six flagella Genus Hexamastix Alexeieff 



With four flagella 2 



2. Trailing flagellum in cytostome; no axo- 



style Genus Chilomastix Alexeieff 



Trailing flagellum not in cytostome; with 



axostyle Genus Eutrichomastix 



Kofoid and Swezy 



Family 9. Cochlosomidae Tyzzer, 



1. Truncate anterior end with sucker 2 



Anterior end not truncate ; cytostome large 



Genus Cochlosoma Kotlan 



2. Sucker flush with surface of body. . .Genus Cyathosoma Tyzzer 

 Sucker at end of tube-like prolongation 



Genus Ptychosoma Tyzzer 



Sub-order 2. Dikaryomastigina. 



1. With more than four flagella 2 



With four flagella (not parasitic). . .Genus Gyromonw Seligo 



