PLATE 10 

 Prophase. 



Fig. 28. Typical vesicular nucleus. Chromidial granules forming around the 

 hyaline area. 



Fig. 29. Unequal constriction of primary karyosome. 



Fig. 30. Unequal constriction of primary karyosome. Organization of 

 peripheral chromatin into granules connected by a slightly chromatic con- 

 tinuous fiber. Partial separation of basal granules. 



Fig. 31. Differential division of primary karyosome into a macrokaryosome 

 and a microkaryosome. Kinetic membrane surrounding the microkaryosome. 



Fig. 32. The same as figure 31 with peripheral chromatin encrusted upon 

 the nuclear membrane. Extranuclear chromidial cloud. 



Fig. 33. The unequal constriction of the macrokaryosome. Note the granular 

 organization of the microkaryosome. 



Fig. 34. First signs of segmentation of microkaryosome. 



Fig. 35. Segmenting microkaryosome with fibers connecting the two polar 

 chromidial masses. Intranuclear chromidial cloud. 



Fig. 36. The same as figure 35; nucleus elongated; peripheral chromatin 

 granules; separation of basal granules, only four flagella. 



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