336 HARRY H. CHARLTON. 



PLATE III. 



FIG. ii. (72 hours.) Egg showing four resting nuclei, and a number of 

 mitochondrial bodies. In addition a divided polar body and two or more smaller 

 structures which are probably phagocytic cells. 



FIG. 12. (72 hours.) Fragmented egg looking very much like a normal two- 

 cell stage, except that each blastomere has two or three nuclei. The nuclei contain 

 nucleoli and appear perfectly normal. 



FIG. 13. (8 1 hours.) A later stage of fragmentation. A large resting nucleus 

 is seen in one of the larger segments, while other fragments have none. In two 

 of the cells the mitochondrial body is quite conspicuous. 



FIG. 14. Egg of uncertain age, consisting of twenty-one fragments. Numerous 

 phagocytic cells are seen in and about the fragments. Zona entirely missing. 



