﻿A MONOGRAPH 



CRAG MOLLUSCA, 



DESCRIPTION OF SHELLS 



rilOM THE 



UPPER TERTIARIES OF THE BRITISH ISLES. 



SEARLES V. WOOD, F.G.S. 



VOL. II. 



BIVALVES. 



LONDON: 



PRINTED FOR THE PALM)NTOGRAPHICAL SOCIETY. 

 1851—1861. 



