A MANUAL 



OF 



THE LAND AND FRESH-WATER 



SHELLS 



OF 



THE BRITISH ISLANDS, 



ARRANGED ACCORDING TO THE MORE MODERN SYSTEMS 

 OF CLASSIFICATION; 



AND 



DESCRIBED FROM PERFECT SPECIMENS IN THE AUTHOR'S 

 CABINET: 



WITH 

 COLOURED PLATES OF EVERY SPECIES. 



BY W: TiJ:RTON,,M.D. 



Scire tuum nihil e^t nisi te scire hoc scidt alter. 



LONDON: 



PRINTED FOR 



LONGMAN, REES, ORME, BROWN, AND GREEN, 



PATERNOSTER-ROW. 



1831. 



