5^ 

 ^^g A MONOGRAPH 



THE CRAG MOLLUSCi^/ 



OR, 



DESCRIPTIONS OF SHELLS 



FROM THE 



MIDDLE AND UPPER TERTIARIES OF THE EAST OF ENGLAND. 



BY * ^ 



SEAELES Y. "wood, F.G.S. 



PART II. 



BIVALYES. 





-'J- 



LONDON: 



PRINTED FOR THE PAL^ONTOGRAPHICAL SOCIETY. 

 1850. 



