[ "2 ] 



prcferved in this Room •, we muft make 

 a few Remarks on thofe contained under 

 each Title. 



Shells, as FofTils, are divided into 

 three Clafles. 



I ft, Thofe that are found in their na- 

 tural State, without the Addition of any 

 other Matter, or the Change of their 

 Subftance. 



2dly, Thofe that are petrified, having 

 the Shell ftill preferved. 



3dly, Stones in the Form of Shells, 

 but without any Remains of the Pattern 

 Shell, which occafioned their having that 

 Form. 



The feveral Kinds of fofTil Shells are 

 at leaft as numerous as thole that are re- 

 cent, and are found in the Earth in moft 

 Countries of the World, and in many 

 Parts of England^ particularly in the 

 Mines in Derby/hire^ in the Rocks at Be- 

 rcsford in Staff or d//iire, at Alftonfieldy in 

 the fame County, and in great Abun- 

 dance in LincolnJJiire and Glocejler/Iiire^ 



befides 



