SPECIAL MORPHOLOGY AND TAXONOMY OF SPOROZOA 457 



plasm, has been described by Debaisieiix (1913, 1915) in species of 

 Thelohania and Glugea. 



The hfe history of Stempellia magna as given by Kudo (1924) is 

 typical of the Microsporidia (Fig. 190). The polar filament of the 

 spore (S) is extruded when the spore reaches the mid-gut of its 

 culicine host; the uninucleate sporoplasm creeps out of the opening 



,c^iS) 



Fig. 191. — Thelohania legeri, life cycle. A, Early stages of sporozoite after leaving 

 the spore .S'; B, formation of binucleated individuals; C, repeated binary division; 

 D, fusion of the two nuclei to form the .sporont; E, to H, nuclear and cell diyisions 

 to form eight sporoblasts each of which forms one spore. (After Kudo.) 



made by the cast-off filament, enters a fat cell and becomes an 

 agamont and reproduces by division (A). The products ultimately 

 become multinucleated with from four to eight nuclei (B), the 

 organisms then breaking up into binucleated cells the nuclei of which 

 fuse after discarding some chromatin (C). This is identified as a 

 sporont which may become transformed into a single spore (D), or 



