BIOLOGICAL BULLETIN 



OF THE 



flDarine Biological Xaborator\> 



WOODS ROLL, MASS. 



Editorial Staff. 



E. G. CONKLIN The University of Pennsylvania, 

 JACQUES LOEB The University of California. 

 T. H. MORGAN Bryn Mawr College. 



W. M. WHEELER American Museum of Natural 

 History. 



C. O. WHITMAN The University of Chicago. 

 E. B. WILSON Columbia University, 



] 



/ 



Efcitor. 



FRANK R. LILLIE The University of Chicago, 



VOLUME V 



WOODS HOLL, MASS. 

 JUNE, 1903, TO NOVEMBER, 1903, 



