PKOTOZOA 



27 



The further development of these takes place in the 

 mosquito, a blood-sucking insect. When the blood is received 

 into the alimentary canal of the insect the crescentic shape 



Lmfai/tWfeb*. r 



FIG. 1 1. Plasmodium. Diagram illustrating life-history, after Minchin and the 

 British Museum models. 1, sporozoite ; 2-4, growth of sporozoite after 

 entering red blood corpuscle ; 5, breaking up into sixteen merozoites ; 

 6, merozoites ; 7, the Plasmodium becoming a garnetocyte ; 8a, 9a and 

 8b, 9b, male and female gametes the changes which occur in the female 

 gametocyte in producing the gamete are not shown ; 10, conjugation of 

 male and female gametes to form zygote ; 11, zygote in stomach wall of 

 mosquito; 12, spore mother cells in cyst in stomach wall of mosquito; 

 13, cyst containing ripe sporozoites. 



changes into a rounded one. The male cells yield each four to 

 six chromidia, which migrate to the surface of the cytoplasm, 

 and a corresponding number of filiform microgametes are 

 produced and liberated. The female cells mature by the 



