PLATE 9 



EXPLANATION OF FIGURES 



Nereis. Development in KNC 

 39 to 41 Four days in KNC to/100000, beginning twelve hours after fertiliza- 

 tion. 



42 Six days in KNC to/IOOOOO, beginning twelve hours after fertilization. 

 Possible acclimation in posterior region. 



43 to 47 Five hours in KNC to/1000, beginning twelve hours after fertilization. 



60 



