SECTION XII. 263 



Family 5. Peftlnoidae, or Shells with 

 equal valves, generally very flat ; the hinge 

 lies on a ftrelght line like the Efcallop, 

 but is fet with feveral parallel and ftrait 

 ridges and intermediate furrows, and the 

 fides are diffimilar. PI. VI. fig. 6. 



There are few fpecles of this family. Lif- 

 ter ranks the two kinds he figures, Lib. iii. 

 PartL Seft.i. cap. 3. by the name of Pec- 

 tines Margaritiferae Polyginglymi. Wood- 

 ward, among his Peftunculi Leptopoly^ 

 ginglymi figura oblonga, Clafs 3. Se£l. i. 

 Art. 2. Gualtieri, PI. 97. A. figures a kind, 

 and calls it Concha Longa Erachiata ; and 

 Seba, PI. 91. figures fome among the 

 Pinnae, and calls them Volfella : but I can- 

 not find theiyi methodized in any other 

 authors. 



There is a very large and extremely 

 thick fpecies of this family, not yet kown 

 recent, found foffil at Bononia in Italy, 



S 4 which 



