MORPHOLOGY AND TAXONOMY OF MASTIGOPHORA 307 



2. Parabasal body invisible in life 3 



Parabasal body visible 4 



3. Mouth-like fold at base of flagellum Genus Eugknopsis 

 Without fold at base of flagellum. . .Genus Astasia 



4. Spindle-shape ; anterior end narrowed 5 



Flask-shape, anterior end funnel-like 



Genus Urceolus 



5. Parabasal body single Genus Peranema 



Parabasal double or triple Genus Jenningsia 



6. Organisms free-living 7 



Organisms parasitic or coprozoic Genus Scytomonas 



7. Body crescentic or S-shape Genus Menoidium 



Body not curved, usually with keels Genus Petalomonas 



Family 3. Heteronemidae. 



1. Cells metabolic 2 



Cells rigid 4 



2. Parabasal body invisible; no cortical gran- 



ules 3 



Parabasal visible; spirally placed cortical 

 granules Genus Dinema 



3. Second flagellum shorter than half the body 



Genus Distigrna 

 Second flagellum as long as, or longer than 



t'ody Genus Heteronema 



4. Periblast smooth; without keels 5 



Periplast with keels 8 



5. Second flagellum trails behind 6 



Second flagellum carried on side Genus Meianema 



6. With internal tube Genus Entosiphon 



"W ithout internal tube 7 



7. With slit-like ventral furrow Genus Anisonema 



With broad, pocket-like ventral furrow 



Genus Marsupiogaster 



8. Body broadly truncate; pyramidal .. Genus Notosolenus 

 Body ellipsoidal 9 



9. Second flagellum half body length or 



shorter 10 



Second flagellum as long as body or longer 



Genus Ploeotia 

 10. Keels inconspicuous, two to four in number 



Genus Sphenomonas 

 Keels conspicuous; eight in number. Genus Tropidoscyphus 



Oedek VI. CHLOROMONADIDA. 



1. Cells with discoidal, bright green cliroma- 



tophores 2 



Colorless; pseudopodia from ventral surface 



Genus Thaumatomastix 



2. Cortex without refractile,. trichocyst-like 



rods ' 3 



Cortex with trichocyst-like rods Genus Gonyostomum 



3. Cells metabolic; narrowed anteriorly Genus Vacuolaria 

 Cells narrowed posteriorly; not metabolic 



Genus Trentonia 



