28 PLEIOCENE FOSSILS. 



PECTEN EBOREUS.— Con. 



Plate XI., Figs. 1 to 5. 



Pecten eboreus, Con., Am. Jour. Sci., Vol. XXIIL, p. 341. 1833. Foss. Ter. Form., p. 48, pi. 23 



and 24, fig. 3. 

 Pecten Holbrookii, Raw., Proc. Ac. Nat. Sci., Vol. II., p. 96. 1844. 



P. testa tenui, orbieulari, depressa, sub-cequivalvi, incequilaterali ; 24-26 costis parviuscu- 

 lis, plants, concentrice striatis ; auriculis inoequalibus. 



Description. Shell orbicular, depressed, valves nearly equal, sub-inequilateral, ribs 24 to 

 26, rather flat, with concentric, undulating lines ; ears unequal, buccal ear with a deep 

 sinus ; lower valve less convex. 



This Pecten, although variable, is well marked by the flat, somewhat rough and rather 

 distant ribs, and oblique outline. 



Plate XL, Fig. 1. Upper valve, natural size. 

 " 2. Lower valve. 

 " 3. Side view of fossil. 

 " 4. Outline of the ribs. 



" 5. Magnified view of a section of the ribs and interstices, showing the concentric 

 undulating lines. 



Locality. Waccamaw. 



Museum, College of Charleston, S. C. 



