HAEMOSPORIDIA 



287 



Plasmodium malariae (Laveran) (Fig. 121, o-u). The para- 

 site of the quartan malaria of man. Schizogony is completed 

 in 72 hours. In tropical and subtropical countries. 



Numerous species of female mosquitoes belonging to the 

 genus Anopheles transmit these organisms. The malaria para- 

 sites are usually studied in stained blood films or smears and, 

 therefore, the following comparison of the above-mentioned 

 three species of Plamodium is based upon observations of 

 stained specimens. 



Plasmodium praecox (Grassi and Feletti) (Fig. 122, a-d). 

 The organism is parasitic in birds, causing the so-called "bird 

 malaria." Numerous birds such as lark, canary, sparrow, finch, 

 barn-yard fowls, duck, pigeon, crow, owl, etc., are known to 

 harbor the organism. The mosquito in which the sexual repro- 

 duction takes place belongs to the genus Culex. The life-his- 

 tory is similar to that of Plasmodium vivax outlined above. 



Family 2 Haemoproteidae Doflein 



The schizogony takes place in the endothelial cells of verte- 

 brates. Certain merozoites penetrate into the circulating blood 

 cells, in whic hthey develop into gametocytes. If the blood 



