66 



MULTIPLICATION OF PKOTOZOA 



passes. When the requisite quantity of cytoplasm has been raised into 

 the elevation this is divided off by a constriction, and the daughter forms, 

 termed merozoites, are produced. These grow into adults, which may 

 again reproduce by schizogony. It is often supposed that the multi- 

 nucleate adult, which is termed a schizont, suddenly segments into a 



Fig. 39. — Hepatozoon cams : Developmental Stages in the Spleen of a 

 Bagdad Dog ( x 2,000). (Original.) 



1. Young schizont in mononuclear cell. 2. Slightly older schizont. 



3. Section of an older schizont \\ith anumber of nuclei. 



4. Section of a schizont in w Inch merozoites are commencing to form by a budding process. 

 .5. More advanced stage of budding process as seen in section of mature schizont. 



G. Merozoites and residual body after schizogony : the merozoites are gametocytes which enter 



the mononuclear cells of the blood-stream. 

 7. Section of stage with eight large merozoites which are probably destined to become schizonts 



again. 8. Stage similar to that depicted at 7. 



number of merozoites, as in the case of malarial parasites. It appears, 

 however, that in all cases the merozoites, whether few in number or more 

 numerous, are formed as small buds at the surface of the schizont, as 

 described above. A variable quantity of the cytoplasm is unused in the 

 formation of the merozoites. This residual cytoplasm, within which may 

 be found a certain number of unused degenerate nuclei of varying size, 



