REPORT 
ON 
EEP-SEA DEPOSIT 
BASED ON THE 
SPECIMENS COLLECTED DURING THE VOYAGE 
OE H.M.S. CHALLENGER 
IN THE YEARS 1872 TO 1876 
BY 
JOHN MURRAY, LL.D., Ph.D. 
ONE OF THE NATURALISTS OF THE EXPEDITION 
AND 
Rev. a. F. RENARD, LL.D., Ph.D. 
PROFESSOR OF GEOLOGY AND MINERALOGY IN THE UNIVERSITY OF GHENT 
