~ DEPARTMENT OF MARINE BIOLOGY 
AA OF 
THE CARNEGIE INSTITUTION OF WASHINGTON 
ALFRED G. MAYOR, Direcror 
PAPERS, 
FROM THE DEPARTMENT OF MARINE BIOLOGY 
OF THE 
CARNEGIE INSTITUTION OF WASHINGTON 
VOLUME XIII 
WASHINGTON, D. C. 
PUBLISHED BY THE CARNEGIE INSTITUTION OF WASHINGTON 
1919 
