98 EXPLANATION OF FIGURES IN PLATES. 



PLATE IV. PHYLLACTINIA CORYLEA. 



FIG. 43. Early stage in synapsis. 



FIG. 44. 'Synapsis ; ends of chromatin strands protruding from contracted mass. 

 FIG. 45. Late synapsis stage stained to specially differentiate the central body. 

 FIG. 46. Loosening up of chromatin after synapsis. 

 FIG. 47. Early spirem stage. 



FIG. 48. Culmination of spirem stage; eight distinct chromatin strands corre- 

 sponding to eight chromosomes of later stages. 



FIG. 49. Same stage; strands spreading from center without forming cone. 

 FIG. 50. Young penicillate cell. Three nuclei showing central bodies. 

 FIG. 51. Full-grown penicillate cell. 



FIG. 52. Transverse section of ascus, showing prophase in formation of spindle. 

 FIG. 53. Primary nucleus of ascus ; equatorial-plate stage, eight chromosomes. 



