

BIOLOGICAL BULLETIN 



OF THE 



noarine 38tolo0tcal laboratory 



WOODS HOLE, MASS. 



JEMtorial Statt 



E. G. CONKLIN Princeton University. 



GEORGE T. MOORE The Missouri Botanic Garden. 



T. H. MORGAN Columbia University. 



W. M. WHEELER Harvard University. 



E. B. WILSON Columbia University. 



JEMtor 



FRANK R. LILLIE The University of Chicago. 



VOLUME XLV. 



WOODS HOLE. MASS. 

 JULY TO DECEMBER, 1923 



