EXPLANATION OF PLATES. 



All the figures were drawn at stage-level with the aid of an Abbe camera, and 

 with a Zeiss apochromatic 2 mm. objective and compensating ocular 4 (= X 600), 

 6(=X750), or8(=Xl000). 



PLATE I. 



Entomophlhora Americana. 



Figures 1-10. Mitosis (X 1000). 



Figure 1. Eesting-nucleus. 



Figure 2. Prophase. Beginning of chromatin aggregation. 



Figures. Prophase. Later stage of aggregation. 



Figure 4. Prophase. Formation of the chromosomes, exposing the radiating 

 linin-fibres. 



Figure 5. Metaphase. Linin-fibres migrating to the poles. 



Figure 6. Late prophase, showing eight chromosomes. 



Figure 7. Early anaphase, showing typical spindle, with the daughter-chromo- 

 somes being drawn toward the poles. 



Figure 8. Late anaphase. The daughter-chromosomes have reached the poles ; 

 the lower pole shows eight chromosomes. 



Figure 9. Telophase. Reconstruction of the daughter-nuclei, which are sepa- 

 rated by a vacuole. 



Figure 10. Telophase. Separation of the daughter-nuclei by constriction. 



Figures 11-14. Zygospore-formation (X750). 



Figure 11. Lateral fusion of the gametes, with budding of the spore from one 

 of the gametes, the several nuclei of the hyphal bodies passing into the young 

 zygospore (form ".r"). 



Figure 12. Fusion of the gametes by their tips, with budding of the spore at 

 the point of union. 



Figure 13. Young zygospore before the formation of the cross-wall, with an 

 attached empty hyphal body. 



Figure 14. The same after the formation of the cross- wall. Figures 13 and 14 

 show the multi-nucleate condition. 



