98 POST-PLEIOCENE FOSSILS. 



Melampus bidentatus, H. 6f A. Adams, Gen. Mollusca, Vol. 2, p. 243, 

 Melampus bidentatus, Say, Conch. United States, ed. Binney, p. 84. 



Dkscription. " Shell thin, fragile, dirty-brownish, very little elevated, obtuse ; body- 

 whorl with minute transverse wrinkles and revolving impressed striae ; labium bidentate ; 

 the superior tooth transverse, prominent, terminating at the exterior edge of the colu- 

 mellar ; labrum with four or five elevated striae, not attaining the edge ; base not con- 

 tracted." — Say. 



Plate XIV. Fig. 15, Natural size. 

 " 15a, Magnified. 



Locality. Simmons'. Museum, College of Charleston; Cabinet F. S. H. 



