PLASMODIA 



295 



P. Vivax. The parasite of tertian malaria completes its asexual 

 development in forty-eight hours; the paroxysms accordingly 

 occur on alternate days. The adult parasite is larger and shows 



CULEX. 



ANOPHELES 



FIG. 46. Comparison between Culex and Anopheles. 



more active ameboid movements than the quartan form. The 

 average number of merozoites produced is usually about sixteen. 

 P. Falciparum. The developmental cycle in the human host 

 occupies from twenty-four to forty-eight hours. The parasite is 

 much smaller than the two other varieties and rarely reaches more 



