TERTIARY DENTALTUM. 217 



D. SUBGIGANTEUM d'Orbigny, 1852 (new name for D. giganteum 

 Sowerhy, 1846, not of Phillips, 1836). Prodr. Paleout Strat., Vol. 

 in, p. 94, No. 1,7 64. 



D. giganteum SOWERBY, 1846 (not of Phillips, 1836). Darwin's 

 Geol. Observations on S. America, p. 263, pi. ii, f. 1. 



D. corrugatum Hupe in GAY, 1854. Hist. Chili, p. 276, Atlas 

 Zool., pi. 2, fig. 8. 



Earlier Tertiary, coast of lopocaima, Chili; also New Zealand 

 Miocene. 



D. SUBIRREGULARE Pilsbry & Sharp, 1898. New name for 

 D. ir regular e Seguenza not Risso. 



D. irregulare SEGUENZA 1879, Form. Terz. Prov. Reggio (Cal- 

 abria), p. 275, pi. 10, f. 33, 33a. 



Pliocene, Astian Stage, Italy. 



D. SUBSEXANGULARE d'Orbigny, 1852. New name for D.sexan- 

 gulare Deshayes, 1825. Prodr. Paleont Strat., Vol. iii, p. 94, No. 

 1,755. 



D. subsexangulatum D'ORBIGNY, 1852. A mistake for D. subsex- 

 angulare d'Orb. Prodr. Paleont. Strat, 1852, Index, p. 59. 



D. sexangulare DESHAYES, 1825. Mem. Soc. Hist. Nat. Paris, ii, 

 p. 350, pi. xvii, figs. 4-6. Not of Lamarck. 



Sacco (1. c.) recognizes and figures varieties striolatissima Sacco, 

 noe Bon. (=aprinum Brocchi and others), magnocostata Sacc.,joera- 

 vuta Sacc., acut angular is Cocc. (=colligens Sacc.). 



Tortonian stage, Upper Miocene, to the Astian, Upper Pliocene, 

 Piedmont. 



D. SUBSTRIATUM Deshayes, 1825. Mem. Soc. Hist. Nat. Paris, 

 Vol. ii, p. 366, pi. xviii, figs. 1-2. 



Fusttaria subdriata NEWTON, 1891. Brit. Oliogocene & Eocene 

 Moll., p. 286. 



Entaliopsis substriata NEWTON & HARRIS, 1894. Proc. Malacol. 

 Soc. London, Vol. i, p. 68. 



D. acuticostum var., J. DE C. Sow., in Dixon's Sussex, 1850, p. 96, 

 pi. 7, f. 16. 



Eocene, Barton and Bracklesham beds, England; Paris Basin. 



D. RULCATUM Lamarck, 1818. Anim. s. Vert, Vol. v, p. 343; 

 figured in Deshayes, Descr. Anim. s. Vert. Bassin Paris, Vol. ii, pi. 

 1, figs. 33-35, 1864. 



Eocene of the Paris Basin. 



