78 CALIFORNIA ACADEMY OF SCIENCES. [Pkoc. 3D Ser. 



EXPLANATION OF PLATE XL 



Fig. 7. The space between the granular zone and the nuclear wall has 

 widened and in this space numerous fibers are seen. The cyto- 

 plasm lias a less regular structure. 



Fig. 8. About the same stage as that shown in fig. 7, but there are many 

 more fibers outside the nucleus. There are also strongly staining 

 fibers m the cytoplasm. 



Fig. 9. The nuclear wall has disappeared at one point and the fibers out- 

 side the nucleus are growing into its cavity. The linin has 

 increased in quantity. 



Fig. 10. The nuclear wall has completely disappeared and the space within 

 the granular zone is filled with a mass of interwoven fibers; those 

 near the center of the space are linin. 



Fig. II. The fibers begin to straighten out and arrange themselves in groups, 

 in which they are parallel to each other. 



Fig. 12. A more advanced stage in this process. 



