PLATE 5 



EXPLANATION OF FIGURES 



Differential acclimation 

 34 to 36 Further cases of over-development of apical and median anterior 

 regions as compared with basal, lateral and posterior. 



37 Differential acclimation after greater degree of inhibition, showing modi- 

 fication in course of basal portion of ciliated band. 



38 A larva showing apical acclimation and basal inhibition. 



39 Apical acclimation and basal inhibition. 



126 



