2OO J. THOMAS PATTERSON. 



PLATE IV. 



FIG. 13. Two naked ova that have not become surrounded by a capsule. 

 Such eggs apparently float about in the parenchyma, but probably never produce 

 embryos. X 543- 



FIG. 14. A binucleated capsule in which the lower nucleus is surrouned by an 

 intravitelline membrane. X 798. 



FIG. 15. A binucleated capsule. X 543. 



FIG. 16. Two ova completely surrounded by a follicular layer of vitelline cells. 

 Only a part of one of the eggs is seen in the section. X 543. 



FIG. 17. A typical case of an aborting spindle. Note that chromosomes are 

 absent from the spindle. X 798. 



FIG. 1 8. Another example of aborting spindle, in which the chromosomes are 

 located among the rays at one end. X 798. 



