PLATE 9 



Figs. 41, 42. Two views of the same figure showing different structures. 

 41. The paradesmose, centroblepharoplast and oblique fibers. Immediately below 

 and intermingled with these are the structures shown in 42 : prophase nucleus and 

 alveolar layer. 



Fig. 43. Nucleus becoming closely attached to the paradesmose. 



Fig. 44. Nucleus showing fifty-tivo chromosomes with marked chromomere 

 structure. X 1250. 



Fig. 45. Prophase nucleus in the tangled-skein stage. 



Fig. 46. Prophase nucleus with looped chromosomes. 



Fig. 47. Same stage. In both figures heteroehromosome remains isolated. 



Fig. 48. Beginning of the tangled-skein stage (?); chromosomes at one side 

 of nucleus stain deeper than those on the other. 



Fig. 49. Marked tendency of chromosomes to assume paired arrangement. 



Fig. 50. Tangled-skein stage. 



Fig. 51. Individual in prophase showing completion of division of ectoplasmic 

 structures. Only a few of the surface ridges are indicated. X 300. 



Fig. 51a. Enlarged view of nucleus of last figure. Chromosome number 

 reduced to 26. 



[92] 



