HAEMOSPORIDIA 



485 



of the stomach (14)- Within the oocysts, repeated nuclear division 

 produces numerous sporozoites (15). When fully mature, the oocyst 

 ruptures and the sporozoites are set free in the haemolymph through 

 which they migrate to the salivary glands (16, 17). The sporozoites 

 make their way through the gland epitheliimi and finally to the duct 



Fig. 225. The life-cycle of Plasmodium vivax (Kudo). 1, sporozoite en- 

 tering human blood; 2, an organism entering an erythrocyte; 3, young 

 schizont ("ring form"); 4-6, schizogony; 7, 8, macrogametocytes; 9, 10, 

 microgametocytes; 11, microgamete-formation in the stomach of a mos- 

 quito; 12, union of gametes; 13, zygote or ookinete; 14, rounding up of 

 an ookinete in the stomach wall; 15, oocyst in which sporozoites are 

 developing; 16, mature ooc^yst ruptured and sporozoites are set free in the 

 liaemolymph; 17, sporozoites entering the salivary gland cells. 



