616 



PROTOZOOLOGY 



eral blood; transmitted by Culex (Huff, 1930). Canaries and ducks 

 are susceptible. Study of nucleus (Chen, 1944). 



P. circumflexum Kikuth (Fig. 264,/). In the red-winged blackbird, 

 cowbird and several other birds, including the ruffed grouse (Fallis, 

 1946) ; growing schizonts and gametocytes form broken rings around 



©®is (o)8§ 



Fig. 264. a, Plasmodium r dictum; b, P. vaughani; c, P. cathemerium; 

 d, P. rouxi; e, P. elongatum; f, P. circumflexum; g, P. polare; h, P. 

 nucleophilum; i, P. gallinaceum; j, P. hexamerium; k, P. oti; 1, P. lophurae. 

 Columns 1, ring-forms; 2, growing schizonts; 3, segmenting schizonts; 4, 

 macrogametocytes; and 5, microgametocytes. X about 1400 (Several au- 

 thors; from Hewitt, modified). 



