BIOLOGICAL BULLETIN 



OF THE 



flDarine Biological %aboraton> 



WOODS HOLE, MASS. 



3EMtorial Staff 



E. G. Conklin- — Princeton University. 



George T. Moore — The Missouri Botanic Garden. 



T. H. Morgan — Columbia University. 



W. M. Wheeler — Harvard University. 



E. B. Wilson — - Columbia University. 



flbanaging EMtor 



Frank R. Lillie — The University of Chicago. 



Volume XLIV. 



WOODS HOLE. MASS. 

 JANUARY TO JUNE, 1923 



