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yet retain their Spines, by which may be 

 feen the Manner of their Difpofition. 



Echinorum Radioli. Many Specimens 

 of the Spines of the different Kinds of 

 Echini, preferved in their recent State 

 as they drop from the Shell they differ 

 in Length and Thicknefs, fome of them 

 being very fmall and lharp, others large 

 and obtufe. 



PatelU^ Limpet Shells ; thefe are of a 

 gibbous Shape, the Apex or Summit o( 

 the Shell is fometimes whole, at others per- 

 forated j not unfrequently fharp pointed, 

 often obtufe. The Fiih adheres very firmly 

 to the Rocks, and is covered by one of 

 thefe Shells. Some of the Specimens 

 here preferved are very curious v many 

 have circular Ridges, others are radiated. 

 The Deck and Chambered Patellae are 

 worth Notice , in fome, half the Circum- 

 ference is dentated, not unlike the Wheel 

 of a Watch. They are chiefly found in 

 Ihe Vv-armer Climates, particularly the 

 Eaji Indies and South America^ 



Aures 



