CNIDOSPORIDIA, ACTINOMYXIDIA 533 



nucleate envelope; 2 inner cells multiply into 16 cells which unite in 

 pairs; nucleus of zygote of sporont divides first into 2; 1 of the nu- 

 clei divides into 6 which form 3 shell-valves and 3 polar capsules, 

 while the other nucleus together with a portion of cytoplasm remains 

 outside the envelope, and undergoes multiplication; multinucleate 

 sporoplasm migrates into spore; sporoplasm later divides into a 

 large number of uninucleate sporoplasms which, when spores gain 

 entrance into a new host, begin development. 



S. stolci C. and M. (Fig. 254, 6). Spore spherical; in Clitellis are- 

 narius and Hemitubifex henedii. 



S. gigas Granata (Fig. 254, c). In the coelom of Limnodrilus hoff- 

 meisteri. 



Genus Hexactinomyxon Stole. Each of 3 shell-valves prolonged 

 into 2 processes; spore appears as a 6-armed anchor. 



H. psammorydis S. (Fig. 254, e). In the gut-epithelium cf Psam- 

 moryctes harhatus; sporoplasm multinucleate. 



Genus Synactinomyxon Stole. Spore with 2 prolonged shell-valves 

 and 1 conical valve. 



S. tuhificis S. (Fig. 254, /, g). In the gut-epithelium of Tuhifex 

 tuhifex. 



Genus Neoactinomyxum Granata. 3 shell-valves without any pro- 

 cess, distended to hemisphere. 



A'', glohosum G. (Fig. 254, h). In the gut-epithelium of Limnodrilus 

 udekemianus; spore with numerous sporoplasms. 



Genus Guyenotia Naville. Pansporoblast with 8 spores; spore 

 spherical with 3 shell-valves, each drawn out posteriorly into digiti- 

 form process, longer than diameter of spore; sporoplasm with 32 

 nuclei. 



G. sphaerulosa N. (Fig. 254, i). In the gut-epithelium of Tuhifex 

 tuhifex; spores 15/i in diameter; appendages of mature spore 40m long. 



References 



AuERBACH, M. 1910 Die Cnidosporidien. Leipzig. 



Caullery, M. and F. Mesnil 1905 Recherches sur les Actinomy- 



xidies. Arch. f. Protistenk., Vol. 6. 

 Davis, H. S. 1917 The Myxosporidia of the Beaufort region. Bull. 



U. S. Bureau Fish., Vol. 35. 

 Fantham, H. B., a. Porter and L. R. Richardson 1939 Some 



Myxosporidia found in certain fresh-water fishes in Quebec 



Province, Canada. Parasitology, Vol. 31. 

 1940 Some more Myxosporidia observed in 



Canadian fi,shes. Ibid., Vol. 32. 

 Granata, L. 1924 Gli Attinomissidi. Arch. f. Protistenk., Vol. 50. 



