HISTORY 



OF 



BRITISH MOLLUSCA, 



AND THEIR SHELLS. 



PROFESSOR EDWARD FORBES, F.R.S., 



OP KING'S COLLEGE, LONDON ; 

 AND 



SYLVANUS HANLEY, B.A., F.L.S., 



OF WADHAM COLLEGE, OXFORD. 



VOLUME IV. 



PULMONIFERA AND CEPHALOPODA. 



LONDON: 



JOHN VAN VOORST, PATERNOSTER ROW. 



M.DCCC.LIH. 



