MORPHOLOGY AND TAXONOMY OF MASTWOPHORA 313 



Order IV. HYPERMASTIGIDA. 



1. Organisms with plications or folds; seg- 



mented appearance Family 6. Teretonymphid.e 



Organisms without plications or folds 2 



2. Flagella placed in spiral rows . . . Family 5. Holomastigotid.e 

 Flagella not in spiral rows 3 



3. Flagella in one or more bundles or tufts. . . 4 



Flagella not in bundles Family 4. Trichoxymphid.e 



4. One anterior bundle or tuft of flagella. ... 5 



Four anterior bundles of flagella . Family 3. Staurojcenid.^ 



5. Flagella directed anteriorly; parabasal in 



calyx Family 1. Lophomonadid.e 



Some flagella directed posteriorly; para- 

 basal not in calyx Family 2. Jcenid.e 



Family 1. Lophomonadidae. 



With from five to fifteen flagella Genus E ulophomonas 



With more than fifteen flagella Genus Lophomonas 



Family 2. Joenidse. 



1. Without trailing flagellum 2 



With one ti-ailing flagellum Genus Parajoetiia 



2. Parabasal body "feathered" 3 



Parabasal not feathered 4 



3. Without anterior ridges and striatic ns. ... 5 



With anterior ridges and striations . Genus Joenopsis 



4. Parabasal a simple curved rod on left of 



nucleus Genus Joenina 



Parabasal a lobed collar below nuclear 



basket Genus Joenia 



5. Anterior end of body flat and dense. Genus Microjcenia 

 Anterior end curved; without dense plate 



Genus Mesojoenia 

 Family 3. Staurojoenidae. 



One genus with characters of the family 



Genus Staurojoenia 

 Family 1. Trichonymphidse. 



1. Flagella arranged in two or more zones. . . 2 

 Flagella in one, anterior, zone 3 



2. Flagella in three zones Genus Trichonympha 



Flagella in two zones Genus Pseudotrichonympha 



3. Flagella as long as or longer than body 



Genus Leidyonclla 

 Flagella relative!}' short (Gymnonympha 



Dobell?) Genus Leidyopsis 



Family 5. Holomastigotidse. 



1. Spiral rows of flagella extend from end to 



end 2 



Spiral rows do not extend to posterior end 



Genus Microspiroirichonympha 



2. Spiral rows of flagella few m number 3 



Spiral rows numerous and close set 4 



3. Nucleus embedded in dense anterior mass 



Genus Holomastigotes 

 Nucleus not in dense anterior mass . Genus Spiroirichonympha 



4. No spiral ridges; flagella increase in length 



posteriori}' Genus SpirotrichonympheUa 



Many spiral ridges; flagella equal in length 



Genus Holomastigotoides 



