26 



MARGARET MORRIS 



Besides these two examples of cleavage there are cases to be 

 found of abnormal division in a plane at right angles to the 

 normal first cleavage plane. One hardly knows whether to call 

 the cell cut off in this manner a large polar body or a small 

 blastomere. The position of the masses of chromatin and the 

 nuclei lead one to think the division may have resulted directly 

 from the second polar spindle. Figure 44 shows one of these 

 cases, in which the cell cut off is of such a size that it might be 



called a polar body. In figure 46, on the other hand, if the di- 

 vision has been completed the cells would have had about the 

 size-relations oi AB and CD in a normal egg. Figure 45 illus- 

 trates an intermediate condition. 



h. Eggs with two polar bodies. No stages illustrating the for- 

 mation of the second polar body were found in the preserved 

 material, but there is no reason to suppose that this process is 

 abnormal in the parthenogenetic eggs in which it takes place. 

 Surface views of the maturation are shown in text-figure 4, and a 

 2-cell stage with two polar bodies. In these nothing appears / 



