426 EDWIN G. CONKLIN. 



EXPLANATION OF PLATE V. 



FIG. 25. No. 927. 2 per cent. NaCl 16 hrs., at close of third cleavage; normal 

 sea-water 24 hrs. Numerous karyomeres in the cells. 



FIG. 26. No. 867. 8 per cent. MgCb f hrs., during third cleavage; normal sea- 

 water 6j hrs. Numerous karyomeres in resting cells; in dividing cells, polyasters 

 and scattered chromosomes. 



FIG. 27. No. 972, same slide as Fig. 25. Karyomeres in all resting cells; 

 polyasters and scattered chromosomes in dividing ones. 



FIG. 28. No. 971. 2 per cent. NaCl 16 hrs., during third cleavage; normal 

 sea-water 12 hrs. Similar to preceding. 



FIG. 29. No. 828. i percent. NaCl 2 hrs., during third cleavage; normal sea- 

 water 65 hrs. Polyasters and chromatic connections between daughter nuclei. 



FIG. 30. No. 956. Sea-water diluted with equal parts of fresh water 2 hrs.; 

 normal sea-water 36 hrs. The nuclei in yolk-containing cells show many karyo- 

 meres. 



