REPORT 
ON THE 
SCIENTIFIC RESULTS 
OF THE 
VOYAGE OF H.M.S. CHALLENGER 
DURING THE YEARS i87 2-7 6 
UNDER THE COMMAND OF 
Captain Sir GEORGE S. NARES, R.N., F.R.S., 
AND THE LATE 
Captain FRANK TOURLE THOMSON, R.N. 
PREPARED UNDER THE SUPERINTENDENCE OF 
THE LATE 
Sir C. WYVILLE THOMSON, Knt., F.R.S., &c. 
REGIUS PROFESSOR OF NATURAL HISTORY IN THE UNIVERSITY OF EDINBURGH 
DIRECTOR OF THE CIVILIAN SCIENTIFIC STAFF ON BOARD 
AND NOW OF 
JOHN MURRAY 
ONE OF THE NATURALISTS OF THE EXPEDITION 
A Summary of the Scientific Results 
APPENDIX (ZOOLOGY, PART LXXXIII.)— REPORT ON SPIRULA. 
bp <2^rDer 
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