742 



ORDER: MICROSPORIDIIDA 



fission, but sometimes division into uninucleate forms does not take place 

 till a larger number of nuclei is present. Eventually, a uninucleate form 

 becomes a pansporoblast, and produces typically eight ovoid spores which 









:"\ 



Fig. 315. — Gurleya francottei. Parasitic in Intestinal Epithelium of Larvae of 

 Ttyclwptera ( x ca. 2,000); Stages of Development of Individual Parasites 

 AND Section of Intestinal Epithelium, showing Parasites in situ. (After 

 Leger, L., and Duboscq, 0., 1909.) 



a-f. Stages in multiplication by binary fission. g. Form with two unequal nuclei. 



h-iii. Division of nuclei in pansporoblast and formation of four spores. 



are enclosed in a thin capsule derived from the superficial layer of the 

 pansporoblast. 



Thelohania varians (Leger, 1897). — This is a common parasite of the 

 larvse of Simulium reptans and S. ornatnm, which are often heavily 

 infected. The cells of the body are seen to be filled with uninucleate 



