Both merogonic and gamogonic stages of Eimeria hermani occurred within the nucleus of epithelial cells of the intestine of experimentally infected goslings (Anser anser domesticus L.). They were located within a parasitophorous vacuole. Several developing meronts were often observed in one host nucleus and each of them had its own parasitophorous vacuole. We suppose that two generations of meronts were formed by ectomerogony from 2 to 4 days post infection (DPI). During the gamogony (4-6 DPI), we observed invagination of the host cell nucleoplasm into the parasites and we suppose that this may be connected with the process of the parasite's feeding.