PLATE 11 



Prophase. 



Fig. 37. Chromidial masses with connecting fibers in the segmenting skein. 

 Chromidial cloud within the kinetic membrane. Macrokaryosome being pushed 

 aside by the expanding kinetic membrane. Peripheral chromatin gathered just 

 within the nuclear membrane. 



Fig. 38. Macrokaryosome in a niche of the nuclear membrane. The seg- 

 menting skein within a precocious spindle formation. 



Fig. 39. Further organization of the skein into the tripod stage. 



Fig. 40. Tripod stage of segmenting spireme. Peripheral chromatin in 

 larger granules. Further separation and initial division of basal granules, pro- 

 ducing four basal granules and eight flagella, splitting of rhizoplast. 



Fig. 40a. Another view of figure 40, showing the four basal granules. 



Fig. 41. Segmenting skein in the form of a double crescent with four 

 terminal knobs of chromatin. Two small granules which may be the division 

 center. Chromidial cloud within the kinetic membrane, macrokaryosome passive. 



Fig. 42. Same as figure 41. 



Fig. 43. Disintegration of macrokaryosome. A moribund stage. 



Fig. 44. Expanding kinetic membrane commensurate with the nuclear mem- 

 brane. Macrokaryosome in a niche of the nuclear membrane. Some chromatin 

 still encrusted upon the membrane. Ehizoplast evident. 



Fig. 45. Longitudinal splitting of segmenting skein, producing seven or 

 eight terminal knobs, in all probability the elements of the future chromosomes. 



Fig. 46. Blepharoplasts separated. Precocious splitting of peripheral 

 chromatin. A precocious equatorial plate with macrokaryosome apparently 

 upon it. 



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