

BIOLOGICAL BULLETIN 



flDarine Biological Xaborators 



WOODS HOLL, MASS. 



JEMtorial 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. 



/IDanaging lEtttor 



Frank R. Lillie — The University of Chicago. 



Volume XIII. 



WOODS HOLL, MASS. 

 JUNE TO NOVEMBER, 1907. 



