PLATE 10 



EXPLANATION OF FIGURES 



Arenicola. Normal and inhibited development 

 48 to 50 Normal development. 



51 Four days in KNC m/100000 from the beginning of elongation. 



52 Six days in KNC m/10000 from the beginning of elongation. 



53 Six days in KNC to/25000 from the beginning of elongation. 



54 to 55 Eight days in KNC m/10000 from beginning of elongation. 

 56 A worm which has completed metamorphosis in KNC m/25000. 



62 



