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GENERAL BIOLOGY OF MICRO-ORGANISMS 



Pig. 8o. — Developmental cycle of Eimeria (Coccidium) schubergi. 7, Sporozoit; 

 //, 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 micro'gametes; 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 a]ter Schaudinn.) 



