Sporozoa 299 



Fig. 6. 18. A-J. Eimeria stiedae, stages in epithelium of bile ducts (rab- 

 bits); X580-600; diagrammatic: growth stage (A); multinucleate schizont (B); 

 merozoites (C, D); young and more mature macrogametocytes (E, F); oocyst 

 membrane formed (G); stage in microgametogenesis (H); surface view and 

 optical section, microgametes nearly mature (I, J). K. Oocyst with four 

 sporocysts, E. stiedae; x860 (after Kessel and Jankiewicz). L. Isospora 

 bigemina, oocyst with two sporocysts; x2400 (after Wenyon). M. Oocyst of 

 Echinospora Jabbei, xl950 (after Lcger). N, O. Barrouxia schneideri (after 

 Shellack and Reichenow): oocyst with sporocysts (N), xl565; sporocyst with 

 single sporozoite (O), xl895. P. Oocyst with collar, surface view, Jarrina 

 paludosa; xl560 (after L^ger and Hesse). Q-S. Dorisiella scolelepidis (after 

 Ray): division of zygote into two sporoblasts (Q, R), xl340; sporocyst with 

 eight sporozoites (S), xl650. T. Oocyst of Cyclospora caryolytica, two sporo- 

 cysts; xl680 (after Schaudinn). 



