THE MOSQUITO CYCLE 



041 



to twelve portions, or " zygotomeres," then each zygoto- 

 mere becomes a spherical body, or " blastophore " (Fig. 

 59, c), and each blastophore develops upon its surface a 

 number of spindle-shaped radically disposed bodies, or 

 " zygotoblasts " (Fig. 59, d). When the zygote reaches 



a 



FIG. 59. Development of the malaria parasite in the mosquito. 

 (After Ross and Fielding-Quid.) 



maturity the blastophores disappear, leaving its capsule 

 packed with large numbers (" thousands ") of free zygoto- 

 blasts. The capsule then ruptures, and the zygotoblasts 

 are poured into the body cavity of the mosquito. The 

 " blasts " measure 12-16 p, in length, taper at each 

 extremity, and possess a central nucleus (Fig. 59, e), and 

 they make their way to all parts of the body of the host, 



M.B. 



41 



