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DEPARTMENT OF MARINE BIOLOGY 



OF 



THE CARNEGIE INSTITUTION OF WASHINGTON 

 ALFRED G. MAYER, Director 



PAPERS 

 FROM THE DEPARTMENT OF MARINE BIOLOGY 



OF THE 

 CARNEGIE INSTITUTION OF WASHINGTON 



VOLUME XII 



WASHINGTON, D. C. 

 * «* 



Published by the Carnegie Institution of Washington 



1918 



