DEPARTMENT OF MARINE BIOLOGY 



OP 



THE CARNEGIE- INSTITUTION OF WASHINGTON 

 ALFRED G. MAYOR, Directok 



PAPERS 

 FROM THE DEPARTMENT OF MARINE BIOLOGY 



OF THE 

 CARNEGIE INSTITUTION OF WASHINGTON 



VOLUME XVIII 



Published by the Caknegie Ii^stitution of Washtngton 

 Washington, Novbmbkb, 1922 



