BIOLOGICAL BULLETIN 



OF THK 



flDarine Biological Xaborator^ 



WOODS HOLE, MASS. 



EMtorial Staff 



E. G. CONKLIN The University of Pennsylvania. 

 JACQUES LOEB The University of California. 

 T. H. MORGAN Columbia University. 

 W. M. WHEELER American Museum of Natural 



History, New York. 



C. O. WHITMAN The University of Chicago. 

 E. B. WILSON Columbia University. 



lE&itor 



FRANK R. LILLIE 77;,? University of Chicago. 



VOLUME XVII. 



WOODS HOLE, MASS. 

 JUNE 1909 TO NOVEMBER 1909. 



