30O FRANZ SCHRADER. 



PLATE II. 



FIG. 8. Cleavage nucleus approaching a polar nucleus derivative. Cytoplasmic 

 area fusing. (P. marilimus.) 



FIG. 9. Two nuclei in apposition. Not certain whether both are polar nucleus 

 derivatives. (P. cilri.) 



FIG. 10. Three nuclei in apposition. The two smaller with chromatin slightly 

 more condensed than that of the larger nucleus. Probably two cleavage nuclei 

 and a polar nucleus derivative. (P. maritimiis.) 



FIG. ii. Nucleus showing 20 chromosomes almost fully condensed and 15 at a 

 slightly earlier phase. The 20 condensed chromsomes seem to be arranged in two 

 groups of 10 chromosomes each. Probably originated from two cleavage nuclei 

 and a polar nucleus derivative. (P. maritimus.) 



