PLATE 10 



Nuclei on this and the following plates have. the reduced number of chromo- 

 somes. In some figures the paradesmose is shown in position, i.e., above the 

 nucleus. In others it is omitted or only indicated by faint lines to secure 

 clearness. 



Fig. 52. Late prophase; nucleus elongated and attached to the parades- 

 mose. 



Fig. 53. Same stage; tubular part of paradesmose omitted. 



Fig. 54. Chromosome arrangement previous to spindle formation. 



Fig. 55. Spindle fibers extending from centroblepharoplasts through 

 nuclear membrane and attached to chromosomes. 



Fig. 56. Showing process of unfolding of chromosomes in the metaphase. 

 Heterochromosome distinct. Vertical view, with paradesmose uppermost and 

 outside nuclear membrane. 



Fig. 57. Lateral view of same stage with paradesmose above the nucleus. 



Fig. 58. Same stage viewed from below, i.e., the interior of the body. 

 Paradesmose is on opposite side of nucleus. 



Fig. 59. Metaphase; paradesmose partly imbedded within the nucleus. 



Fig. 60. Final division of the chromosomes; heterochromosome distinct and 

 still undivided. Entire nucleus elongating. 



Fig. 61. Early anaphase; heterochromosome divided. 



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