THE MALARIA PARASITE 



517 



" ookinet " ; it passes into the outer wall of the mosquito's 

 stomach, where it becomes encysted (Fig. 60, a, 6). At 

 this period the zygote is about 7-8 ^ in diameter. If 

 development proceeds, it acquires a distinct capsule and 

 begins to grow rapidly, and when mature at the end of a 



FIG. 60. Development of the malaria parasite in the mosquito. 

 (After Ross and Fielding-Ould.) 



week or more, according to the temperature, is 60 /x in 

 diameter, and projects into the body-cavity of the insect 

 (Fig. 60, b). Its substance next divides into eight to 

 twelve portions, or " zygotomeres," then each zygotomere 

 becomes a spherical body, or " blastophore " (Fig. 60, c), 

 and each blastophore develops upon its surface a number 

 of spindle-shaped, radially disposed bodies, or " zygoto- 

 blasts " (Fig. 60, d). When the zygote reaches maturity 



