BIOLOGICAL BULLETIN 



OF THE 



fiDarine biological laboratory 



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. 



JE&itor 



FRANK R. LTLLIE The University of Chicago. 



VOLUME XLIX. 



WOODS HOLE. MASS. 

 JULY TO DECEMBER, 1925 



