BIOLOGICAL BULLETIN 



or Tin-: 



fiOavtnc Biological Xaborator^ 



\Y< M >;>S IK )[.!,, MASS. 



E&itorial Statf 



K. (1. CONK i. ix Tlie University of Pennsylvania. 



JAMJTKS Loi;i: Tin' University of California. 



T. H. MDKCAX Colinnlna University. 



\V. M. WHKKLKR American ^fiiscuni <>f Xafural 



C. O. WHITMAN Tlie University of 

 \\. \>. \\ILSDN Columbia Universit. 



lEMtor 



I'k ANK R. LIIJJK The University nf C///cng(>. 



VOLUME XI. 



WOODS HOLL, MASS. 

 H \E TO NOVEMBER, 1906. 



