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GENERAL BIOLOGY OF MICRO-ORGANISMS 



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FIG. 78. Developmental cycle of Eimeria (Coccidium) schubergi. I, Sporzoit; 

 II, sporozoit penetrating a cell of the host; III and IV, stages of growth; V to 

 VII, asexual multiplication; VIII, agamete or merozoit beginning again the asexual 

 cycle; IX and X, agametes destined to form sexual cells (gametes); XI, a to c, devel- 

 opment of the macrogamete; XII, a to d, development of microgametes; XIII, 

 fertilization; XIV and XV, the fertilized cell or zygote; XVI and XVII, metagamic 

 division of the zygote; XVIII, formation of the sporoblasts; XIX, formation of 

 the spores and sporozoits; XX, sporozoits emerging from the spores and from the 

 oocyst. (From Doflein after Schaiidinn,) 



