TERTIARY DENTAL1UM. 209 



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

 187, pi. 17, fig. 1 (No. 4, p. 73, pi. 7, fig. 1). 



Eocene, Midway stage, Alabama and Mississippi. 



D. MICHELOTTII Hoenies, 1856. Foss. Moll. Tertiiir Beckens von 

 Wien, p. 654-655, pi. 50, fig. 33. SACCO, Moll. Terr. Terz. Pie- 

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

 cosicillata, rotundulinct, rotundosimplex, costulatior, costiilatissima 

 Sacco. 



The involved synonymy includes D. pseudosexagonum Bonelli, 

 not Dh , pseudoentalis 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 Gabh, 1860. Journal Acad. Nat. Sci. Phila. 4 

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



Lower Claiborne Eocene of Texas* 



D. MIOCENICUM Michelotti, 1847. Descr. Foss. Terr. Mioc. ItaL 

 Septrion, p. 144-145, pi. 16, fig. 12. Entalis miocenica SACCO, MolK 

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



Lower Miocene of Piedmont. 

 D. MIOPSEUDOENTALIS (Sacco), 1897. 



Entalis miopseudoentalis SACC., Moll. Terr. Terz. Piemonte e 

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



Miocene of Piedmont. 

 B. MISSISSIPPIENSE Conrad, 1847. 



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

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

 pi. xi, fig. 1. 



D. denmtum CONRAD, Amer. Journ. of Conch, i, p. 212, pi. 20, 

 f. 15. 



Oligocene, Vicksburg, Mississippi. 



D. virginianum 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. 



Ujjper Eocene ofMons. 

 14 



