Sporozoa 327 



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Fig. 6. 35. A. Young trophozoite of Coelosporidium periplanetae (aftei- 

 Ivani^). B. Nuclear division in binucleate trophozoite of Haplosporidium 

 cernosvitovi, x2000 (after Jirovec). C. Phismothum of Coelosporidium peri- 

 planetae (after Ivanit). D, E. Division of plasmodium (C. periplanetae) 

 into uninucleate trophozoites (after Ivanic). F. Sporoblasts in C. peri- 

 planetae (after Ivanic). G. Young spores in plasmodiiun of C. periplanetae, 

 x2290 (after Sprague). H. Spores within a pansporocyst in Haplosporidium 

 cernosvitovi, xI375 (after Jirovec). 



In Haplosporidium cernosvitovi, a histozoic species from oligochaetes, 

 nearly mature spores generally lie within a distinct membrane (Fig. 6. 

 35, H). 



Shape of the spore (Fig. 6. 36) and structure of the membrane vary in 

 different species. The membrane apparently is bivalved in Coelospori- 

 dium periplanetae (Fig. 6. 36, B) and seems to be operculate in certain 

 other species. In some cases, the membrane is extended into horns or may 

 show adherent filaments, while the "tail" in Urosporidiiim possibly rep- 



