122 THE NAL'TILLS. 



Locality: From tlie •' Burrstone," near Beulah P. O., Newton 

 County, Miss. 



Remarks. — This little species is strikingly similar to the species 

 named Astarte opulentora Dall, but that is from the Pliocene 

 of Mexico. 



NOTES ON THE CLASSIFICATION OF THE TORNATELLINID.E. 



BY HENRY A. PILSBRY. 



The TornaiellinidcB are a group of small or minute land snails 

 found on the islands in and around the Pacific. An illustrated 

 monograph has been prepared for the " Manual of Conchology," but 

 as its publication will be delayed until the appearance of \\\ki Achati- 

 nellidcs, a briet sketch of the classification is here published in 

 advance. 



These shells have some resemblance to Achatinellidce and Par- 

 tididce in shape, but differ from both families by having an entering 

 parietal lamella. In at least two species this is absent through de- 

 f^eneration in the adult stage, and in some others it is much nnluced. 

 Some species of the section Lnmellina undergo remarkable changes 

 from youth to maturity, the adult stage being secondarily simplified. 

 Young individuals should always be collected with adults, when 

 possible. 



Key to Genera and Minor Divisions. 

 I. Shell rather solid, glossy, bright or dark colored or variegated ; 

 axis imperforate, but usually superfically riniate in the adult 

 stao-e. Genus Auricui.ella Pfr. 



II. Shell thin, light brown or corneous, not polished. 



a. Axis imperforate, slender, the columella more or less 

 sinuous. 



h. Shell globose-ovate ; columella armed with an angular 

 or bilobed vertical callus or plate, truncate or exca- 

 vated below the prominence. 



Genus Elasmias n. gen. 



c. Spire of few (3 to 4^) whorls; columellar callus 



in form of a vertical, angular or bilobed plate. 



Section Elasmias. 

 \ 



