436 EDWIN G. CONKLIN. 



EXPLANATION OF PLATE X. 



FIGS. 55-60. All from one experiment. No. 858. Eggs in 2-4-cell stage were 

 left in sea- water diluted with equal parts of fresh water for two hours; then in 

 normal sea-water fourteen hours. Remains of chromatic connections which were 

 formed during the third cleavage are seen in Figs. 55, 56, 60. Other chromatic 

 connections which were formed in later cleavages after the eggs had been returned 

 to normal sea-water are shown in Figs. 57-60. 



