234 J- McA - KATER. 



PLATE II. 



FIG. 14. Chromosomes lining up on equator to form horse shoe around the 

 spindle. Paradesmose visible above spindle. 



FIG. 15. Metaphase. 



FIG. 16. Polar view of metaphase. 



FIGS. 17 AND 18. Migration of chromosomes to poles of spindle. 



FIG. 19. The nucleus has become elongated into a cylinder with pointed ends 

 and the chromosomes are fusing together. The paradesmose is seen on anterior 

 side of nuclear membrane and the basal granules are enlarging. 



FIG. 20. The chromosomes have fused into a single mass at the poles, and the 

 basal granules have divided. 



FIG. 21. The chromatin masses of the preceding one have broken up to form a 

 spireme comparable to that of Fig. 13. 



FIGS. 22 AND 23. Reconstitution of the daughter nuclei and division of the cell. 



FIG. 24. A case where fission was either delayed or prevented by some unknown 

 cause. 



FIG. 25. Beginning of encystment. The flagella have been lost and the cell is 

 packed with starch bodies. 



