BIOLOGICAL BULLETIN 



OF THE 



nrmrine Biological laboratory 



WOODS HOLE, MASS. 



jEMtortal Staff 



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. 



Editor 



FRANK R. LILLIE The University of Chicago. 



VOLUME XLI1I. 



WOODS HOLE, MASS. 

 JULY TO DECEMBER, 1922 



