MALARIA AND MOSQUITOES 



95 



union of the gametes may ultimately be filled with 

 thousands of these small sporozoites, together with 

 the rest of the cytoplasm, and in addition a blackish 



FIG. 22 STAGES OF MALARIAL PARASITE, SHOWING SPOROZOITE 

 FORMATION, AS SEEN IN SECTIONS OF CYSTS FROM THE OUTER 

 WALL OF THE MOSQUITO'S STOMACH 



A, Rounded oocyst formed from the ookinete; B, early stage of 

 division of oocyst ; C, showing division into numerous nuclei ; 

 D, the protoplasm beginning to form projections ; , cyst 

 containing many sporozoites 



pigment, known as melanin, which is produced by 

 the parent parasites. Ultimately the cyst (Fig. 22, 

 E) bursts, and liberates the contained sporozoites 

 into the body cavity of the host. The sporozoites 



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