MORPHOLOGY AND TAXONOMY OF MASTIGOPHORA 311 



4. Intestinal parasites 5 



Free-living forms 6 



5. With large cytostonie Genus Embadomonas 



No cytostonie; with "blastocystis" stage 



Genus Schizobodo 



6. With deep, gullet-like mouth Genus PhyllomUus 



Without gullet-like mouth 7 



7. Broad ventral furrow with rolled edges 



Genus Colponema 

 Without ventral furrow 8 



8. Trailing flagellum from anterior end Genus Bodo (Proivazekia) 

 Trailmg flagellum from center; feedmg 



dorsal Genus Pleuromonas 



Posterior flagellum leaves body from end 



Genus Cercomonas 



Order III. POLYMASTIGmA. 



With one cytostonie and one kinetic complex 



Tribe 1. Monozoa 

 With two cytostomes and kinetic elements 



(distomata) Tribe 2. Diplozoa 



Compound individuals (possibly permanent 



somatellae) Tribe 3. Polyzoa 



Tribe I. Monozoa 



Without cytostome, undulating membrane, or 



axostyle Group 1 



Without cytostome, without undulating mem- 

 brane, with axostyle Group 2 



With cytostome; with undulating membrane; 



without axostyle Group 3 



With cytostome, with undulating membrane, 



with axostyle Group 4 



With cytostome, without undulating mem- 

 brane, with axostyle Group 5 



Group 1 



1 . With one trailing, and two anterior flagella 2 

 With more than two anterior flagella 3 



2. Trailing flagellum leaves body at posterior 



end Genus Enteromonas 



Trailing flagellum leaves body half way 



down Genus Diplocercomonas 



3. With three anterior flagella Genus Tricercomonas 



With more than three anterior flagella .... 4 



4. With four anterior flagella 5 



With six anterior flagella, no trailing flagel- 

 lum Genus Streblomastix 



5. Four equal anterior flagella directed for- 



ward 6 



Two equal flagella directed anteriorly, two 



posteriorly Genus Monocercomonas 



6. Usually free-living, body eUipsoidal or 



truncated Genus Tetramitus 



Coprozoic, body pyramidal or triangular 



Genus Copromastix 



