A MONOGRAPH 



OF 



THE CRAG MOLLUSCA 



OK, 



DESCRIPTIONS OF SHELLS 



FROM THE 



MIDDLE AND UPPER TERTIARIES OF THE EAST OF ENGLAND. 



BY 



SEARLES V. WOOD, F.G.S 



PART I. 



UNIVALVES. 



LONDON : 

 PRINTED FOR THE PALiEONTOGRAPIIICAL SOCIETY. 



1848. 



