COCC1D1IDEA 



FIG. 67. Life-cycle of Eimeria (Coccidiutn) schubergi, Schaud., from the intestine of 

 Lithobius. (After Schaudinn.) The infection is caused by a cyst (xx), containing spores, 

 which reaches the intestine of a Lithobius, where it discharges the sporozoites (r). n, A 

 sporozoite invading an intestinal epithelial cell ; ill, intestinal epithelial cell with young 

 trophozoite ; iv, intestinal epithelial cell with a globular schizont ; v, nuclear segmentation 

 within the schizont ; VI, the daughter nuclei arranging themselves superficially ; vn, forma- 

 tion of the merozoites ; vin, merozoites that have become free, and which, penetrating into 

 other epithelial cells of the same intestine, repeat the schizogony (li-vin) ; IX and x, 

 merozoites which, likewise invading the epithelial cells of the same intestine, become 

 sexually differentiated ; Xia, young macrogametocyte ; xib, older macrogametocyte ; xic, 

 mature macrogametocyte (discharging particles of chromatin) ; xiia, young microgametocyte ; 

 xnb, older microgametocyte ; xnc, increase of nuclei in the microgametocyte ; xnd, the 

 globular residual body around which numerous microgametes have formed ; xne, an isolated 

 microgamete ; xm, the mature macrogamete surrounded by numerous microgametes and 

 forming a cone of reception or fertilization prominence ; Xiv, shows the nucleus of a 

 microgamete that has penetrated and fused with the nucleus of the macrogamete (fertilization) 

 the latter forms a membrane and becomes an oocyst ; xv, XVI, xvii, nuclear segmentation 

 in the oocyst; xvin, oocyst with four sporoblasts ; xix, the sporoblasts transformed into 

 spores, each containing two sporozoites ; xx, the cyst introduced into the intestine and 

 liberating the sporozoites by bursting. 



