Fig. 206. IrtTB-HIflTORY OP COCCIDIUM SCHUBBROI. 



1, Two epithelial cells containing schizonts, with a sporozoite shown entering 

 one of them. 2, Schizont fully developed, with nuclei dividing. 3, Schizont, 

 with numerous nuclei formed by division of original nucleus. 4, Group of mero- 

 zoites formed by division of schizout. 5, An epithelial cell containing a male and 

 female gametocyte, 6 $ andG C^>, Male and female gametocytes more developed. 



7 $ and 7 <, Gametocytes showing separation of chromatin from karyosome. 



8 , Male gametocyte dividing up into male gametes. 8 O, Female gamete, with 

 nucleus of chromatin and projection of protoplasm attracting male gametes. 9, 

 Zyprote just after conjugation. 10, Zygote later stage, forming oocyst. 11, Zygote, 

 with nucleus^ dividing. 12, Zygote, with four nuclei produced by division. 13, 

 Oocyst containing four spores. 14, Each spore divided into two sporozoites, with 

 sporal residuum. 15, Oocyst and spore-cyst ruptured and sporozoites escaping. 



418 



