C) 



Qli 





/^' ^DEPARTMENT OF MARINE BIOLOGY 



THE CARNEGIE INSTITUTION OF AVASHINGTON 

 ALFRED G. MAYER, Director 



r 



PAPERS 



/^ 



FROM THE DEPARTMENT OF MARINE BIOLOGY 



OF THE 

 CARNEGIE INSTITUTION OF WASHINGTON 



VOLUME XII 





WASHINGTON, D. C. 

 Ill 



Published by the Carnegie Institution of Washington 



1918 



