TERTIARY DENTALIUM. 215 



D SANDBERGERi Bosquet, 1859. Neerland. Verh. Kon. Akad. 

 Wetensch.. Vol. vii, p. 20, pi. ii, fig. 7. 



D. entaUs Braun (not of Linn.) Walchn. Geognos., IT Aufl., p. 

 1,121 (quoted by Pictet &Campiche, Paleont. Suisse). 



D. fissura Nyst, 1843 (not of Laraarck, 1818). Mem. Courron, 

 Sav. Etrang. Brussels, Vol. xvii, p. 346. 



Eocene, Paris Basin, etc. 



D. semialternans Chenu, 1842. Illustr. Conch., Vol. i, p. 7, pi. 

 4, fig. 7. 



Horizon and Habitat unknoivn. Probably Tertiary. 



D. semiclausum Nyst, 1835. Recherehes Coq. foss. prov. An- 

 vers, p. 36, pi. 5, fig. 53. See also Nyst, Ann. Mus. Roy. d'Hist. 

 Nat. Belg., iii, pt. 1, p. 120, pi. 7, f 14. 



Pliocene, Scaldisien stage, near Antwerp, Belgium. 

 D. SEMiNUDUM Deshayes, 1864. Descr. Anim. s. Vert. Bassin 

 Paris, Vol. ii, p. 200, pi. 3, figs. 11-14. 



Eocene of the Paris Basi7i. 



D. SEXANGULUM Graelin, 1788. Syst. Nat. (13), p. 3,739, no. 

 21. — Brocchi, Conch, foss. Subapp., ii, pi. 15, f. 25. — Sacco, Moll. 

 Terr. Terz. Pieraonte e Liguria, pt. 22, p. 92, pi. 7, f. 48, to 54. 



P>. elephantinum Brocchi, t. c, p. 260 (in part). — Deshayes, 

 Mem. Soc. Hist. Nat. Paris, p. 347, 348.— Risso, Hist. Nat. Eur. 

 Merid., iv, p. 399, and of some other authors. 



D. sexangulare Lamarck, 1818. Anim. s. Vert., Vol. v, p. 344, 

 and of most other authors. 



D. sexangulare var. acutangularis Cocconi, 1873. Mem. Accad. 

 Sci. Bologna, 3°, Vol. iii, p. 645. 



D. sexangulare var. snbrecta Cocconi, 1873. ]\lem. Accad. Sci. 

 Bologna, 3°, Vol. iii, p. 645. 



? D. noe Bonelli in Sismonda, Osserv. Miner, e Geol. Piemonte, 

 p. 35. D'Orbigny, Prodr. Paleont. Strat., Vol. iii, p. 178. No. 255. 

 This may be referable to D. subsexaugulare Orb., q. v. 



D. SIMPLEX Michelotti, 1861. Et. Mioc. Inf, in Natuurkundige 

 Verhandl. Hollandsche Maatschappij Wetenschappen te Haarlem 

 (2), XV, p. 136, pi. 13, f. 12, 13. 



Oligocene of Italy, at Carcare, Dego, Mioglia, Pareto, Cassinelle, 

 etc. 



D. soLiDUM Hutton, 1873. Cat. Tertiary Moll. New Zealand, 

 p. 2. 



Tertiary (Pareora), New Zealand. 

 Referred to D. giganteum Sowb. as a synonym by some authors. 



