2o6 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



EXPLANATION OF PLATE XL. 



Fig. 19. Shows a spindle in the anaphase. The granular zone is well 

 marked. From the spindle irregular fibers, probably mantle- 

 fibers, pass out and penetrate the granular zone. 



Fig. 20. Represents a spindle in the anaphase. Branching fibers extend 

 from the chromosome-groups toward the cell-wall. The granu- 

 lar zone is somewhat obscured by a more general distribution 

 of granular matter between the spindle and the cell-wall. 



Fig. 21. Shows the daughter-nuclei formed. The spindle-fibers still con- 

 nect them. Branching fibers radiate in all directions from them. 



Fig. 22. The spindle-fibers are separated from the daughter-nuclei, each of 

 which is surrounded by a dense mass of granular cytoplasm. 



