P R 0 C E E D I N G S 
OF THE 
YORKSHIRE 
GEOLOGICAL AND POLYTECHNIC SOCIETY. 
New Series, Vol. XII. , Part III., pp. 227— 273. 
mith Gwo flMates. 
Edited by JAMES W. DAVIS, F.S.A., F.G.S , &c. 
18 9 3- 
