BIOLOGICAL BULLETIN, VOL. XXIV 



CURVE 3 



3> 2 3 4 S 6? 8 O 10 ii 12 13 14 15 16 ([ 18 19 20 21 22 24 25 26 27 28 29 30 31 

 July 3 6 9 12 IS 18 21 24 27 3O Aug. 2 



CURVE 4 



20 



10 



2 3 



Aug. I 



5 6 7 8 O 10 ii 12 13 14 15 16 <L 18 19 20 21 22 

 7 10 13 16 19 22 



24 25 26 27 28 29 30 31 

 25 28 31 



ULLIE AND JUST 



