Abstract
SYNOPSIS. The structure of the oocyst and formation of sporozoites of Aggregata eberthi were studied with the electron microscope. After penetration of the microgamete, a cyst wall containing fine projections is formed beneath the “anhist” layer which is pushed away. The cytoplasm is retracted beneath the cyst wall and is irregular in outline. Lipid inclusions are abundant, while paraglycogen is less so. Vacuoles present in the early stages of development may be instrumental in elaboration of the cyst wall. Granulations appear in the early oocyst cytoplasm and form large compact masses in the sporoblasts, assuming a crystalline appearance (crystalloid) in the sporozoites. The sporoblasts are separated by the coalescence of vesicles. Each sporoblast is surrounded by an epispore and a striated endospore which is perforated by the “dehiscence device.” Three sporozoites of classical structure are formed in each sporoblast.
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