The Protozoa 



153 



Development of Coccidium schnbergi 1, entrance of sporozoites in cell; 2, its 

 growth; 3, nuclear multiplication; 4, division into merozoites; 5, macro-and 

 microgametes; 6, zygote divided into four sporozoites. 8-11, Emeria stiedae. 8, 

 auto-infection; 9, formation of sporoblasts; 10, change of spores into sporozoites; 

 11, spore with two sporozoites, much enlarged; c, z, sporozoite; e, epithelial cell; 

 k, ii, nucleus; mi, microgamete; o, macrogamete; r, residual body; sp, spore; 

 sp', sporoblasts. (1-7 after Schaudinn; 8-11 after Wasielewsky and Metzner.) 



20. Subclass 1. Telosporidia ( ) Sporozoa in 

 which the life of the individual ends in spore formation. 



21. Order 1. Gregarinida ( ) Telosporidia 

 possessing a firm pellicle and complex ectosarc ; intracellular during the 

 early stages of the life cycle, later free in the body cavities of inverte- 

 brates. 



Examples: Monocystis, Porospora, Gregarina. (Fig. 71.) 



-?• 





rJ. 





§M 



i& 



A. B. C. 



Fig. 73. Plasmodium malariae. 



A. Parasites of tertian malaria. 



B. Parasites of estivo-autumnal malaria. 



C. Parasites of quartan malaria. (After Thayer and Hewetson.) 

 (From supplement No. IS to the Public Health Service, /an. 20, 1915.) 



