

THE SEAS y ?7 



OUR KNOWLEDGE OF LIFE IN THE SEA Iff- & 

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BY 



F. S. RUSSELL, D.S.C., B.A. (Cantab) 



Assistant Naturalist to the Marine Biological 

 Association, Plymouth ; Formerly Assistant Director 

 of Fisheries Research to the Egyptian Government 



AND 



C. M. YONGE, D.Sc, Ph.D. 



Leader of the Great Barrier Reef Expedition, 1928-9 ; 



Formerly Assistant Naturalist to the Marine 



Biological Association, Plymouth 



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