TERTIARY DENTALIUM. 209 



D. MEDIAVIENSE Harris, 1896. Bull. Amer. Palaeont , Vol. i, p. 

 187, pi. 17, fig. 1 (No. 4, p. 7.3, pl.7,Hg. 1). 



Eocene, Mklivay stage, Alabama and Mississippi. 



D. MiCHELOTTii Hoernes, 1856. Foss. Moll. Tertiiir Beckens von 

 Wien, p. 654-655, pi. 50, i\g. 83.— Sacco, Moll. Terr. Terz. Pie- 

 nionte e Liguria, xxii, p. 96, pi. 7, f. 84-86, with " varieties" iiiter- 

 cosicillafa, rotunduUna, rotundosimplex, costulatior, costulatissima 

 Sacco. 



The involved synonymy includes D. pseudosexagonvm Bonelli, 

 not Dh , pseudoeutalis Sisinonda not Lam., lamarcki Mayer (in 

 part). 



Miocene of the Vienna Basin and Piedmont. 



D. MicROSTRfA Heilprin, 1880. Proc. Acad. Nat. Sci. Phila., 

 1880, p. 375, pi. 20, fig. 3. 



Eocene, Lignitic, Woods Bluff, Alabama^ 

 D. MiNUTiSTRiATUM Gubb, 1860. Joumal Acad. Nat. Sci. Phila.„ 

 (2d Ser.), Vol. iv, p. 386, pi. 67, fig. 46. 



Lower Claiborne Eocene of Texas.. 

 D. MiocENicuM Michelotti, 1847. Descr. Foss. Terr. Mioc. Ital.. 

 Sef)trion, p. 144-145, pi. 16, fig. 12. — Entails mioceiiica Sacco, MoU.. 

 Terr. Terz. Piem. e Ligur., xxii, p. 108, ]A. 9, f. 31-35. 



Lower Miocene of Piedmont, 

 D. MiopsEUDOENTALis (Sacco), 1897. 



Entails miopseudoentalis Sacc, Moll. Terr. Terz. Piemonte e 

 Liguria, xxii, p. 106, pi. 9, f. 7-11, with var. costatior Sacc. 



Miocene of Piedmont. 

 D. MISSISSIPPI ENSE Conrad, 1847. 



D.mississippensis Conrad, Proc. Acad. Nat. Sci. Phila., 1846- 

 7, p. 282 ; figured in the Jouru. Acad. Nat. Sci. Phila. (2), Vol. i, 

 pi. xi, fig. 1. 



D. densatum Conrad, Araer. Journ. of Conch, i, p. 212, pi. 20> 

 f. 15. 



Oligocene, Vicksburg, Mississippi. 

 D. virgiiiianum Chenu, 111. Conch., i, pi. 4, f. 8, 8a, 8b, unde- 

 scribed, may possibly be this species. D. densatum Conr. (from 

 type) is a fragment of an old individual of Mississippiense. 



D. MONTENSE Briart & Cornet, 1889. Mem. Acad. Roy. de Bel- 

 gique, Vol. Ixvii, p. 60, pi. 24, figs. 12 a-b. 



Uj'per Eocene ofMons. 

 14 



