T H E 



ZOOLOGY 



VOYAGE OF H.M.S. EREBUS & TERROR, 



UNDER THE COMMAND OE CAPTAIN SIR JAMES CLARK ROSS, R.N., F.R.S., 



DURING THE YEAES 



1839 TO 1843. 



BV AUTHORITY OF THE LORDS COMMISSIONERS OF THE ADMIRALTY. 



EDITED liY 



JOHN RICHARDSON, M.D., F.E.S., &c.; 

 JOHN EDWARD GRAY, Esq., Ph.D., F.R.S., &c. 



MOLLUSCA. 



BY 



EDGAR A. SMITH, E.Z.S., Zoological Department, British Museum. 



LONDON: 

 E. W. JANSON, 28, MUSEUM STREET, W.C. 



M.DCCC.LXXIV. 



