

aiyonofMoliuiBB 

 gectional Library 



TO 



JOHN GWYN JEFFREYS, Esq., F.R.8., 



AND 



JOSHUA ALDER, Esq., 



NATURALISTS 



EMINENTLY DISTINGUISHED FOR THEIR KNOWLEDGE OF 



THE BRITISH MOLLUSCA, 



THESE VOLUMES ARE DEDICATED BY 



THE AUTHORS. 



