BIOLOGICAL BULLETIN 



OF THE 



fiDarine Biological Xaboraton? 



WOODS HOLE, MASS. 



JEMtortal Staff 



E. G. CONKLIN Princeton University. 



JACQUES LOEB The Rockefeller Institute for Medical Research. 



GEORGE T. MOORE The Missouri Botanic Garden. 



T. H. MORGAN Columbia University. 



W. M. WHEELER Harvard University. 



E. B. WILSON Columbia University. 



FRANK R. LILLIE The University of Chicago. 



VOLUME XXXIII. 



WOODS HOLE, MASS. 

 JULY TO DECEMBER, 1917 



