BIOLOGICAL BULLETIN 



OF THE 



flDarine Biological Xaborator^ 



WOODS HOLE, MASS. 



BMtorial Staff 



E. G. CONKLIN Princeton University. 



JACQUES LOEB The Rockefeller Institute for JMedical Research. 



T. H. MORGAN Columbia University. 



W. M. WHEELER Harvard University. 



E. B. WILSON Columbia University. 



Efcitor 



FRANK R. LILLIE The University of Chicago. 



VOLUME XXVII. 



WOODS HOLE, MASS. 

 JULY TO DECEMBER 1914 



