BIOLOGICAL BULLETIN 



OF THE 



flDarine Biological Xaborator\> 



WOODS HOLL, MASS. 



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. 



Efcitor. 



FRANK R. LILLIE The University of Chicago. 



VOLUME X. 



WOODS HOLL, MASS. 

 DECEMBER, 1905, TO MAY, 1906. 



