BIOLOGICAL BULLETIN 



OF THE 



fIDarine Biological laboratory 



WOODS HOLL, MASS. 



Editorial Staff. 



E. G. CON KLIN The University of Pennsylvania. 

 JACQUES LOEB The University of California. 

 T. H. MORGAN Bryn Mawr College. 



W M. WHEELER American Museum of Natura/ 

 History. 



C. O. WHITMAN The University of Chicago. 

 E. B. WILSON Columbia University. 



FRANK R. LILLIE The University of Chicago, 



VOLUME V 



WOODS HOLL, MASS. 

 JUNE, 1903, TO NOVEMBER, 1903. 



