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Refemblance to an Olive. It is in reality 

 the Spine of an Echinus filled with Spar ^ 

 it is very beautifully fluted and ftriated 

 longitudinally it is common in Syria^ and 

 fometimes found with us. 



Belemnites^ vulgarly called Thunder- 

 bolts or Thunder Stones. They are com- 

 pofed of feveral Crufts of Stone encircling 

 each other, of a conical Form, and va- 

 rious Sizes ufually a little hollow, and 

 fomewhat tranfparent, formed of feveral 

 Stricg radiating from the Axis to the Sur- 

 face of the Stone and when burnt or 

 rubbed againft one another, or fcraped 

 with a Knife, yield an Odour like rafped 

 Horn, their Size is various, from a quar- 

 ter of an Inch to eight Inches ; and their 

 Colour and Shape differ. They are fup- 

 pofed to be originally either a Part of 

 fome Sea Produdion, or a Stone formed 

 in the Cavity of fome Worm Shell, which 

 being of a tender and brittle Nature, has 

 perifhed, after giving its Form to the 

 Stone. They are very frequently found 



in 



