X. INTRODUCTION. 



A HISTORY OF BRITISH MOLLUSC A AND THEIR 



SHELLS ; Professor Edward Forbes and Silvanus 



Hanley. 

 A MANUAL OF LAND AND FRESH-\VATEU SHELLS 



OF THE ' BRITISH ISLANDS ; William Turton, 



revised and much enlarged by John Edward Grey. 

 ILLUSTRATIONS OF BRITISH CONCHOLOGY ; Thomas 



Brown. 



TESTACEA BRITANNICA ; George Montague. 

 HISTORIA VERMIUM TERRESTRIUM ET FLUVIATILIUM; 



O. F. Muller. 

 CATALOGUE DES MOLLUSQUE TERRESTRIS ET FLUVI- 



ATILLS DU PAS DE CALAIS ; Bouchard Chantreux. 



