180 CONTRIBUTIONS 



folds are only four in number, and are placed near to the 

 base. 



The genus Marginella does not seem to have been ob- 

 served in a fossil state in Great Britain. Seventeen 

 species are given in M. Deshayes's Tables, nine of these 

 are from Paris. From the Tertiary of Maryland Mr Con- 

 rad has described one species, the denticulata- Professor 

 Vanuxem presented me some years since with a specimen 

 from Charleston, S. C., taken from a bed of very recent 

 Formation, (newer Pliocene Period,) he did not deter- 

 mine its species. I suspect it to be analagous with an 

 existing species of the West Indies. 



FAMILY CONVOLUTA. 



GENUS ANOLAX.* Roissy. 



A. gigantea. Plate 6. Fig. 193. 



Description. Shell ovato-elliptical, smooth ; substance 

 of the shell thick ; suture scarcely visible ; spire conical, 

 acute at the apex ; whorls four, flattened above ; columella 

 smooth ; mouth ovate, three fifths the length of the shell, 

 largely emarginate below and slightly so above ; inner lip 



* Andllaria, (Lamarck). I use the name of Anolax on the authority 

 of M. Brogniart. See Terrains du Vicentin, p. 63. 



