564 BIOLOGY OF THE PROTOZOA 



Order 2. Schizogregarinida Leger 1892. 



4. Sporocysts less than 8 5 



Sporocysts 8 or more 7 



5. One sporocyst in gametocyst 6 



Two sporocysts in gametocyst Genus Mattesia Naville 



6. Schizogony in lumen Genus Ophryocystis Schneider 



Schizogony, intracellular Genus Merogregarina Porter 



7. Intracellular throughout most of cycle. ... 8 

 Celozoic throughout 9 



8. With 16 sporocysts Genus Lipotropha Keilin 



With more than 16 sporocysts Genus Mensbiera Bogolavlensky 



9. Trophozoite elongate, worm-like. . Genus Schizocystis Leger 

 Trophozoite globular Genus Cdulleryella Keilin 



FAcutheroschizon mesnili not known in sexual cycle. 



Sub-class 2. COCCIDIOMORPHA. 



1 . Gametocytes develop independently; many 



microgametes Order 1 . Coccidiida 



Gametocytes associated in pseudo-conju- 

 gation; few microgametes Order 2. Adeleida 



Order 1. Coccidiida (Coccidia Leuckart). 



1 . Zygote and sporoblasts protected by resis- 

 tant unchanging sporocyst capsules 



Sub-order 1. Eimerilna 

 Zygote with delicate, growing sporocyst 



Sub-order 2. Haemosporidhna 



Order 2. Adeleida. 



1. Zygotes with tough, resistant sporocyst; 



non-motile Sub-order 1 . Adeleina 



Zygotes ^ath delicate sporocysts; motile 



Sub-order 2. Haemogregarinina 



Sub-order 1. Eimeriina. 

 Key to Fmn i lies 



1. Growing and multiplicative phases cy to- 



zoic 2 



Growing and multiplicative phases celo- 

 zoic _■ ■ • • 5 



2. Trophozoite and microgametocyte divide 



into secondary forms (Schizontocytes) 



Family 4. Garyotrophidae 

 Trophozoite divides into agametes (mero- 

 zoites) . . . 3 



3. Zygotes develop directly into sporozoites 



(asporocystid) Family 6. Laxkesterellidae 



Zygotes divide to form sporoblasts 4 



4. Schizogony in one type of host, sporogony 



in another Family 5. Aggregatidae 



Schizogony and sporogony in the same host 



Family 3. Eimeriidae 



5. Schizonts and gametocytes intracellular 



(cytozoic) Family 2. Selexococciidae 



All stages celozoic Family 1. Gryptosporidiidae 



