HELICOSPORIDIA 



679 



Fig. 293. Diagram illustrating the probable development of Helico- 

 sporidia, X about 1600 (Keilin). a-c, schizont and schizogony; d, spo- 

 ront(?); e, three stages in formation of four-celled stage; f, hypothetical 

 stage; g, young spore before the spiral filament is formed; h, mature spore; 

 i, j, opening of spore and liberation of sporoplasms. a-h, in living host 

 larva; i, j, in dead host body. 



ony and sporogony; spore with central sporoplasms and a single 

 thick coiled filament. One species (Keilin, 1921). 



H. parasiticum K. (Fig. 293). In body cavity, fat body, and nerv- 

 ous tissue of larvae of Dasyhelea obscura and Myceiobia pallipes 

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

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

 5-6/x in diameter; extruded filament 60-65/* by 1/z thick. 



References 



Borchert, A.: (1930) Nosemainfektion. Arch. Bienenk., 11:1. 

 Braem, F.: (1911) Beitrage zur Kenntnis der Fauna Turkestans. 



VII. Trav. Soc. Imp. Nat., St. Petersbg., 42:1. 

 Chatton, E. and Krempf, A.: (1911) Sur le cycle evolutif et la po- 



