[ 117 1 

 Sheil ; they are alfo generally auricu- 

 lated. 



Echinites, petrified Sea Urchins, or 

 Hedgehogs. Here are a great Variety 

 of Specimens of this Kind of foffil Shell ; 

 fome of them are filled with Spar or Flint 

 formed within the Shell ; others have their 

 Cavities taken up by various Kinds of 

 earthy or ftony Subflances •, this is for 

 the moft part governed by the Nature of 

 the Place or Bed in which they are found. 

 Some of the Specimens have their Surface 

 fmooth and even, in others it is covered 

 with a Mixture of Excrefcences and Ca- 

 vities, or diverfified with beautiful and 

 regularly difpofed Lines *, their Size and 

 Form is various, according to their dif- 

 ferent Kinds. The Spines of thefe foflil 

 Shells are generally found near them^ 

 and of the fame Subftance : They 

 abound m.oft in Chalk Pits. The Lapts 

 Judaicus^ found in Judea^ is of this 

 Clafs : They are often called Olive 

 StoneSy from their bearing m Figure fome 



