A MONOGRAPH 



OF THE 



MOLLUSCA FROM THE GREAT OOLITE, 



CHIEFLY FROM 



MINCH1NHAMPTON 



AND 



THE COAST OF YORKSHIRE. 



BY 



J. MORRIS, F.G.S. AM, JOHN LYCETT. 



PART II. 



BIYALVES. 



LONDON 



PRINTED FOR THE VAIJEONTOGRAPHICAL SOCIETY. 



1S53. 



