222 SOME MINUTE ANIMAL PARASITES 



cyst around itself, and becomes a spore (Fig. 41, 



4-iij. Little by little tne spore-coat tnickens untu 



i K. -/...'*"-' *.:' 4. -'""*'* "* * "^'Vv* ":"'" I.-'"..-. .y .*'-,*" ."*/" t.-i^I' ./ V'.M-ilv I "">'-./ T 



FIG. 41 NOSEMA APIS : SPORES AND SPORE STRUCTURE 



Piece of epithelium from the chyle stomach of the bee, showing 

 two colonies of sporoblasts and young spores of N. apis. 

 The tissue near the colonies shows eight sets of meronts, some 

 of which have recently entered the tissue. B, Epithelial cell 

 crowded with spores ; fresh preparation. C, Spore showing all 

 five nuclei. D, Fresh spore showing discharged polar filament. 

 E, Spore from which amoebula is about to issue. Polar fila- 

 ment has been expelled, but is lying near. Sporoplasmic 

 nuclei show well, sporocyst nuclei distinct, nucleus of polar 

 capsule degenerating. C and E are on a larger scale than A,B,D 



