DENTALIUM, MESOZOIC. 219 



D, TRiGONUM Hoeninghaus, 1831. Jahrb. Min. Geo!., p. 155. 

 Nomen nudum. 



Tertiary, Tahbiano. 



D. TRiQUETRUM Brocchi, 1814. Coq. foss. Subapp., ii, p. 628. — 

 Gadilina triquetra Sacco, Moll. Terr. Terz. Piem. e Ligur., xxii, p. 

 113, pi. 10, f. 35-46, with var. taiirogracilis Sacc. 



Elvezian, Tortonian and Piacenzian stages, Montegibhio, Bordig- 

 hera, Monte del Cappuccini, etc., N. Italy. 



D. TRYONi Pilsbry & Sharp, 1898. Proc. Acad. Nat. Sci. Phila., 

 1897, p. 468, pi. 10, f. 5, 9 ; pi. 11, f. 22. 



OUgocene of San Domingo. 



D. viTREUM Gmelin, 1788. Syst. Nat. (13), p. 3,739, No. 20. 

 — Antale vitreum Sacco, Moll. Terr. Terz. Piemonte e Liguria, 

 xxii, p. 100, pi. 8, f. 42-49. 



Lower Miocene to Upper Pliocene, Elvezian to Astian stages, north- 

 ern Italy. 



D. vuLGARE (Da Costa). 



Sacco describes a Pliocene variety perstriolata in Moll. Terr. Terz. 

 Piera. e Ligur., xxii, p. 98, pi. 8, f. 1-5. 



D. XIPHIAS Sharp & Pilsbry, 1898. New name for D. ajfine De- 

 shayes, 1864, not of Biondi, 1859. 



D. affine Deshayes, Descr. Anim. s. Vert. Bassin Paris, Vol. ii, 

 p. 201, pi. 1, figs. 12-14. 



Eocene, Paris Basin. 



Mesozoic species. 



D. ALATUM Gardner, 1878. Quart. Journ. Geol. Soc. Lond., 

 Vol. 34, p. 60, 61, pi. iii, figs. 16-20. 



Cretaceous, Gualt at Folkstone, England. 

 D. andleri Oppel, 1856. Jahresh. Ver. fiir Vaterl. Naturkunde 

 in Wuerttemberg, Jahrg. xii, p. 213. 



Lower Lias, zone of Ammonites angulatus, near Vaihingen. 

 D. angulati Quenstedt, 1852. Handb. Petrefaktenkunde, p. 



443. Nomen nudum. 



Lias of Europe. 



D. arcotinum Forbes, 1846. Trans. Geol. Soc. London (Ser. 2), 

 Vol. vii, p. 138, pi. 12, fig. 16. 



Cretaceous of India. CPondicherry). 



Antale arcotinum Stoliczka, 1868. Cret. Faun. Southern India, 

 Vol. ii, p. 445, pi. xxvii, fig. 23. 



