PLATE 8 



Fig. 32. Prophase with division of the centroblepharoplast completed in the 

 tubular part but no split yet appearing in the ectoplasmic structures. An unusual 

 figure. X 300. 



Fig. 33. Splitting of the centroblepharoplast and the formation of the 

 paradesmose between the bases as they separate. 



Fig. 34. A later stage of the same with the halves forming new tubes con- 

 nected at the tip. Note development of spines at tip. 



Fig. 35. An earlier stage of the same showing the split beginning at the base, 

 with the ectoplasmic structures drawing apart. 



Fig. 36. Splitting completed; paradesmose elongates as the new ceutro- 

 blepharoplasts move apart. 



Fig. 37. Vertical view of an early stage of splitting of centroblepharoplast. 



Fig. 38. Vertical view of individual in prophase with the divided centro- 

 blepharoplasts connected by paradesmose. Part of oblique fibers and alveolar 

 layer shown. Note aster arrangement of alveoli around centroblepharoplasts. 

 X 300. 



Fig. 39. Prophase nucleus showing tlie breaking up of the chromatiu- 

 enerusted network. 



Fig. 40. Paradesmose, centroblepharoplasts and their related fibers in the 

 prophase, witli the nucleus elongating preparatory to formation of mitotic spindle. 



[90] 



