LARVAE OF ARBACIA PUNCTULATA 



339 



Fig. 13 la, 72 hrs. Control. 



Fig. 14 16, 72 hrs. Larger than control, otherwise normal. 

 Fig. 15 Ic, figure 16 Id, figure 17 le, 72 hrs. Gradual inhibition as to size. 

 Fusion retarded. 



Fig. 18 la, 96 hrs. Control. 



