Fig. 8 1 . A diagram of the life cycle of a typical member of the Myxosporidia. 

 The schizogony shown here (D-F) probably often does not occur. A, Escape of 

 germ. B, Migration within host. C, Infection of a cell of the latter. D-G, 

 Schizogony and reinfection. H, Multiplication of nuclei. I, Appearance of 

 first pansporoblast. J, Appearance of more pansporoblasts and multiplica- 

 tion of syncytium by plasmotomy. K, L, Development of spores in a pansporo- 

 blast. M, Fully formed spore, before conjugation. N, Ripe spore after con- 

 jugation, env. envelope cell; nu.' nucleus of spore case; nu." nucleus of 

 pole capsule; sph. undifferentiated sporoblast with nuclei which will become 

 those of the germ, spore case, and pole capsules ; vac. vacuole containing 

 glycogen sometimes found ; zy.nu. zygote nucleus. 



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