DENTALIUM, MESOZOIC. 219 



D. TRIGONUM Hoeninghaus, 1831. Jahrb. Min. Geol., p. 155. 

 Nomen nudum. 



Tertiary, Tabbiano. 



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. taurograeilis Sacc. 



Elvezian, Tortonian and Piacenzian stages, Montegibbio, 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. 



Oligocene 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. 

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



D. XIPHIAS Sharp & Pilsbry, 1898. New name for D. affine 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. fur Vaterl. Naturkunde 

 in Wuerttemberg, Jahrg. xii, p. 213. 



Lower Lias, zone of Ammonites angulatus, near Vaihingen. 

 D. ANGULATI Quenstedt, 1852. Handb. Petrefaktenktinde, 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. (Pondicherry). 



Antale arcotinwn STOLICZKA, 1868. Cret. Faun. Southern India, 

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



