480 PROTOZOOLOGY 



divides apparently twice and thus forms four small cells which 

 develop into a spore. The complete life-history is still unknown. 



Genus Helicosporidium Keilin. Parasitic in insects; schizogony 

 and sporogony; spore with central sporoplasms and a single thick 

 coiled filament. One species. 



H. parasiticum K. (Fig. 223). In body cavity, fat body, and 

 nervous system of larvae of Dasyhelea ohscura and Mycetohia pal- 

 lipes (Diptera), and Hericia hericia (Acarina), all of which inhabit 

 wounds of elm and horse-chestnut trees; schizonts minute; spores 

 5-6)u in diameter; extruded filament 60-65^ by 1^ thick. 



References 



Debaisieux, p. 1928 fitudes cytologiques sur quelques Micro- 

 sporidies. La Cellule, Vol. 38. 



Hesse, E. 1935 Sur quelques Microsporidies parasites de Mega- 

 cyclops viridis Jurine. Arch. zool. exp. et gen., Vol. 75. 



JfROVEC, O. 1936 Studien iiber Microsporidien. Mem. Soc. Zool. 

 Tchecoslovaque de Prague. Vol. 4. 



Keilin, D. 1921 On the life-history of Helicosporidium para- 

 siticum. Parasit., Vol. 13. 



Kudo, R. 1924 A biologic and taxonomic study of the Micro- 

 sporidia. Illinois Biol. Monogr., Vol. 9. 



ScHRADER, F. 1921 A microsporidian occurring in the smelt. 

 Jour. Paras. Vol. 7. 



