COCCIDIIDA 



.-,.- , ..., . ** 



FIG. 30. Scheme of the development of Coccidium schubergi, Schaud. (from the 

 intestine of Lithobius). (After Schaudinn.) The infection is caused by a cyst (xx.), 

 containing spores, which invades the intestine of a Lithobius, where it bursts and dis- 

 charges the sporozoites (i.). n., A sporozoit invading an intestinal epithelial cell; 

 in., intestinal epithelial cells with young coccidia ; iv., intestinal epithelial cells 

 with a globular schizont ; v., nuclear segmentations within the schizont ; vi., the 

 daughter nuclei arranging themselves superficially ; vn., formation of the mero- 

 zoites ; vin., merozoites that have become free, and which, penetrating into other 

 epithelial cells of the same intestine, repeat the schizogony (ii.-vm.) ; ix. and x., 

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

 individually sexually differentiated ; xia., adolescent macrogamete ; xib., older 

 macrogamete ; xic., mature macrogamete (discharging particles of nucleus) ; xiia., 

 young microgametocyte ; xijb., older microgametocyte ; xnc., increase of nuclei 

 in the microgametocyte ; xnd., the globular residual body around which numerous 

 microgametes have formed ; xiie., an isolated microgamete ; xin., the mature 

 macrogamete surrounded by numerous microgametes and forming a fecundating 

 prominence ; xiv., the nucleus of a microgamete that has penetrated amalgamated 

 with the nucleus of the macrogamete (fecundation) the latter casts off a membrane 

 and becomes a sporont (oocyst) ; xv., xvi., xvn., nuclear segmentation in the 

 sporont ; xvin., sporont with four sporoblasts ; xix., the sporoblasts transformed 

 into spores ; xx., the cysts introduced into the intestine that has liberated the sporo- 

 zoites by bursting. 



