206 TERTIARY DENTALIUM. 



D. INCERTULUM (Sacco), 1897. 



Fustiaria incertula SACC., Moll. Terr. Terz. Piem. e Ligur., xxii, 

 p. 113, pi. 10, f. 34. 



D. intermedium COPPI, Framm. di Paleont. Modense, p. 16, Boll. 

 R. Comitato Geol. Ital.. vii, p. 203, 1876, not of Gay, 1854. 



Upper Miocene, Tortonian and Piacenzian, S. Agata and Monte- 

 gibbio, N. Italy. 



D. INCERTUM Deshayes, 1826. Mem. Soc. Hist. Nat. Paris, 

 Vol. ii, p. 362-363, pi. xvii, fig. 17 ; Descr. An. s. Vert. Bassin 

 Paris, ii, p. 202, pi. 1, f. 26, 27. . 



Eocene of the Paris Basin. 



D. INCISISSIMUM Meyer & Aldrich, 1886. Journ. Cincinnati Soc. 

 Nat. Hist., Vol. ix, p. 40, pi. 2, fig. 1. 



Eocene (Oligocene) Wautubbee, Mississippi. 



D. INCISTJM Chenu, 1842. Illustr. Conch., Vol. i, p. 4, pi. 6, figs. 

 S-9. 



Described from Italy, without more exact locality. It is prob- 

 ably pliocene, and is not unlike D. agile. 



D. INOPINATUM Mayer. 



A European Eocene species allied to D. sexangulum, of which we 

 have seen no description. 



D. INTERMEDIUM Hupe", in Gay, 1854. Hist. Chile, viii, p. 276, 

 Atlas, Zool., pi. 2, fig. 9. 



Tertiary, coast of Topocaima, Chili. 



D. INTERRUPTUM Gmelin, 1789. Syst. Nat. (13), p. 3,739. 

 Entalis interrupts SACCO, Moll. Terr. Terz. Piem. e Ligur., xxii, p. 

 108, pi. 9, f. 36-46. 



Tortonian upper Miocene, S. Agata, Stozzano, Montegibbio, north- 

 ern Italy. 



D. IRREGULARIS Kisso, 1826. Hist. Nat. Europ. Merid., Vol. iv, 

 p. 400. 



Probably Pliocene or Miocene, at " Trinite." Not recognized 

 thus far by other authors. 



D. JANI Homes, 1856. Foss. Moll. Tertiar Beckens Wien, p. 

 657, pi. 50, f. 37. QUENSTEDT, Petrefactenkunde, vii, p. 807, pi. 

 217, f. 84, 85. Fustiaria jani SACCO, Moll. Terr. Terz. Piem. e 

 Ligur., xxii, p. 112, pi. 10, f. 25-33 with var. striatellulata Sacc. 



Miocene and Pliocene, Tortonian to Astian, Northern Italy and 

 Austria. 



