cm. 



I 



m. 



\ 



^.(d.J. j^ 



DESCRIFnON OF PLATE. 



Diagrammatic representation of a portion of the chyle stomach of the honey bee, 

 showing the Ufe-history of Xoseina apis. The numbers indicate the different successive 

 stages in the development of the parasite. (Based on the researches of Drs. Fantham 

 and Porter.) 



ep. Epithelial cells lining the chyle stomacli. The darker oval bodies are the nuclei 

 of these cells. c.?rt. Circular muscle fibres. L??i. Longitudinal muscle fibres. 1. Spores 

 taken in with the food, and seen floating in the cavity of the chyle stomach. 2. A 

 spore with extruded polar fllanu-nt just prior to giving rise to an amcebula. 3. Amre- 

 buht freshly issued from the spores. 4. I)aug!iter ama-bulao which become planonts. 

 5. An amccbula wiihin an epithelial cell of The cliyle stomach. 6. Planonts within the 

 epithelial cells. They have withdrawn the pseudopodia and become rounded in 

 outline 7. A meront within an epithelial lell ^. Epithelial cells each containing two 

 meroni<. In the uppermost of the three cells bearing the number 8. a meront is seen 

 in process of division. 9. Group of daughter nieronts within tlie epithelial cells. 10. 

 Newly developed spores being discharged into the cavity of the chyle stomach owing 

 to the rupture of the epithelial cell. 11. Epithelial cells which have broken away from 

 the walls of the chyle stomach. Daughter meronts are seen within the cells. 12. 

 Mature spores floating in the cavity of the chyle stomach. 



D 2 



