AN 



INTRO DUCTI N 



TO 



CONCHOLOGY: 



OR, ELEMENTS OF 



THE NATURAL HTSTORY OF 



MOLLUSCOUS ANIMALS. 



BY 



GEORGE JOHNSTON, M.D., LL.D., 



FELLOW OF THE ROYAL COLLEGE OF SURGEONS OF EDINBURGH. 



<^ 





LONDON: 



JOHN VAN VOORST, PATERNOSTER ROW. 



M.D.CCCIi. 



