SPOROZOA 



435 



to be an erythroblast, an immature red blood cell in which there is 

 little or no hemoglobin. As the parasite enlarges, the host cell be- 

 comes swollen an'4 its nucleus much flattened and distorted. The 

 parasite itself grows long and rather slender and is differentiated 



Pig. 194.: — Hamoproteus (Leukocylozoon) ziemanni in the blood of an owl with £(, 

 pure infection. A, Young parasite in an erythroblast. B, Growing parasite dis- 

 torting the nucleus of the host-cell. C and D, Further stages of growth with marked 

 distortion of the nucleus and of the outline of the host cell. E, Full-grown macro- 

 gametocyte. F, Macrogametocyte and microgametocyte in the same field. G, 

 Formation of microgam6tes from the microgametocyte. (^After microphoiographs of 

 Prof. F. G. Novy.) 



to form either the male or the female gametocyte, readily dis- 

 tinguished by their appearance in stained preparations. Mean^ 

 while, the host cell becomes very much elongated and pointed at 

 the ends. The explanation of this pecuhar distortion of the cell 



