X. INTRODUCTIOTSr. 



A History of British Mollusca and their 

 Shells ; Professor Edward Forbes and Silvanus 

 Hanley. 



A Manual of Land and Fresh-Water Shells 

 of the British Islands ; William Turton, 

 revised and much enlarged by John Edward Grey. 



Illustrations of British Conchology ; Thomas 

 Browm. 



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. 



