410 BIOLOGY OF THE PROTOZOA 



microgametes. After fusion of a macrogamete and a microga- 

 mete the zygote becomes a motile vermicule which makes its way 

 to the lining membrane of the gut, penetrates it and comes to 

 rest in the submucosa. Here the amphinucleus divides many 

 times and the cell body increases enormously in size, the delicate 

 fertilization membrane, unlike the resistant oocyst of the Coccidia, 

 enlarging with it. As growth progresses, the sporoplasm breaks 

 up in "islands" which suggest the sporoblasts of Coccidia, and 

 about each of them the nuclei are peripherally arranged. The 

 sporozoites are budded out from these islands, each with one of the 

 peripheral nuclei. These are ultimately liberated in the body 

 cavity of the mosquito; make their way to the salivary glands 

 which they penetrate, and come to rest in the lumen from which 

 they finally reach the proboscis. 



(For genera of Hemosporidia and other Coccidiomorpha, see 

 Key, p. 566.) 



