MORPHOLOGY AND TAXONOMY OF THE SPOROZOA 559 



Sub-order 1. Haplocyta Lankester 



Key to Families 



6. Trophozoites unbranehed — 1 terminal 



sucker Family 6. Stomatophoridae 



Trophozoites branched, each branch with 



terminal sucker Family 7. Aikinetocystidae 



7. Male and female gametes well differen- 



tiated Family 4. Schaudinellidae 



Gametes similar Family 5. Rhynchocystidae 



8. Sporonts united by ball and socket joint 



Family 9. Ganymedidae 

 Sporonts without ball and socket joint. . . 9 



9. Sporocysts without funnel at one end .... 10 

 Sporocysts with funnel at one end 



Family 10. Urosporidae 



10. Sporocysts tetraedral Family 13. Tetraedrocystidae Baur 



Sporocysts oval or spindle-shape 11 



1 1 . Sporocysts oval, one pole thickened 



Family 11. Lecudinidae 

 Sporocysts spindle-shape, one side thick- 

 ened Family 12. Allantocystidae 



Si b-order Haplocyta Lank. Homopolaridea. 



Family 1. Monocystidae Aut. 



1 . Trophozoites spherical or oval 2 



Trophozoites much elongated 3 



2. Trophozoites ovoid, often with button at 



anterior end Genus Monocystis Stein 



Trophozoites spherical, no protuberances 



Genus Apolocystis Cognetti 



3. Trophozoite elongated; like nematode 



worm Genus Xenmtocystis Hesse 



Trophozoite elongated: one end swollen; 



club-shape Genus Rhabdocystis Boldt 



Family 2. Zygocystidae Bhatia 1930. 



1 . Association tete-a-tete ; long posterior fila- 



ments Genus Zygocystis Stein 



Association otherwise 2 



2. Association side by side; bod}' striations 



distinct Genus Pleurocystis Hesse 



Conjugants form cross; head of one at- 

 tached to center of the other. . . .Genus Enterocystis Zwetkov 

 Family 3. Diplocystidae Bhatia 1930. 



1. Trophozoites spherical or oval Genus Diplocystis Kunstler 



Trophozoites small, spatulate Genus Lankesteria Mingazzini 



Family 4. Schaudinnellidae Bhatia. 



One genus with epimerite or free as male and 



female gamonts Genus Schatidinnella Nusbaum 



Family 5. Rhynchocystidae Bhatia 1930. 



One genus, with metabolic epimerite. .Genus Rhynchocystis Hesse 

 Family 6. Stomatophoridae Bhatia 1930. 



1. Trophozoites round or oval 2 



Trophozoites ellipsoid or star-shaped 6 



2. Suckers; without filaments or pseudo- 



podium 3 



Suckers; with filaments or pseudopodium . 5 



