BIOLOGICAL BULLETIN 



OF THE 



flDarine Biological Xaborator? 



WOODS HOLE. MASS. 



EMtorial 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. 



lE&itor 



FRANK R. LILLIE The University of Chicago. 



VOLUME LI. 



WOODS HOLE. MASS. 

 JULY TO DECEMBER, 1926 



