" V 



^ 1^4^ A MONOGRAPH 



V. \ 



HoU. 



OF 



THE CRAG MOLLUSCA, 



WITH 



DESCRIPTIONS OF SHELLS 



FROJI THE 



UPPER TERTIARIES OF THE BRITISH ISLES. 



BY 



SEARLES V. WOOD, F.G.S. 



VOL. L 



UNIVALVES. 



LONDON: 



PRINTED FOR THE PAL.EONTOGRAPHICAL SOCIETY. 



1848. 



