Feb., 1846.] 21 



Bonellia. 

 Bonellia lineata. Plate 1, fig. 23. Vide Proceed. A. N. S., vol. i. p. 32. 



CALYPTILEA. 



Subgenus Dispotcea, Say. 



All the species of this genus found in the United States belongs to Say's 

 genus Dispotcea, which forms a very natural and distinct group, if the cha- 

 racters of the shells are any criterion of generic distinction. The following 

 list of species occur in the Miocene strata of the Union : 



C. (Dispotcea) corrugata, Brod. \ Recent on the coast of Central Ame- 

 D. ramosa, Con. J rica, and fossil in Virginia. 



C. (Dispotcea) costata, Say, \ Recent ; coast of Central Hmerica. 

 C. rugosa, Brod. ) Fossil in Maryland. 



C. (Dispotcea) multilineata, Con. Fossil. Wilmington, North Carolina. 



C. (Dispotcea) dumosa, Con. " ' " 



Trochus. 

 Trochus peralveatus, Plate 1, fig. 25. Vide Proceed. A. N. S., vol. i. p. 30. 



Myodora. 



Myodora arenosa, Con. (Pandora arenoso, Con.) Foss. Shells of Tert. 

 Form., p. 4, pi. 1, fig. 3. 



Eocene species. 



Ampullaria ? 



Ampullaria ? perovata. Plate 1, fig. 16. Ovate, body whorl ventricose ; 

 spire conoidal? aperture subovate, half the length of the shell. 

 Locality. Claiborne. 



I possess but one imperfect specimen of this shell. It is rather elevated 

 for an Ampullaria ; but to this genus or to Paludina, the form of the aper- 

 ture more nearly allies it, than to any marine genus which is known to me. 



Caricella. 



Shell pyriform, with ribs or spines : spire short, apex thickened or papil- 

 lated ; beak somewhat produced and slightly curved, pointed, not emarginate 

 at base ; columella with four or five oblique, prominent, compressed plaits, 

 decreasing in size towards the base, as in Milra. 



In my publication entitled " Fossil Shells of the Tertiary Formations,' 

 I propose the above name for a group of Claiborne shells, and re- 

 ferred it as a subgenus Turbinella, but the characters are sufficiently dis- 

 tinctive to constitute a genus. The want of an emarginate base widely 

 separates it from Mitra or Voluta. The labrum is always simple, without 

 teeth, and thin. The following species may be designated: C. bolaris, 



