220 DENTALIUM, ME8OZOIC. 



D. ARCTUM Pichler, 1857. Jahrb. Min. & Geol., p. 695 ; Giimbel, 

 Geognostische Beschreib. des Bayerischen Alpengebirges, p. 274 

 (1861). 



Trias, Tyrol. 



D. BICOSTALE Ryckholt, 1852. Mem. Couronn. Acad. Roy. Sci. 

 Belg., Vol. xxiv, p. 71, pi. ii, figs. 43, 44. 



Cretaceous, Tournay, Belgium. 



This is considered by Gardner a synonym of D. decussatum Sowb. 



D. BINKHORSTI Pilsbry & Sharp, 1898. New name for D. nysti 



Binkhorst, 1861, not of d'Orb. 1852. See Binkhorst, Monogr. 



Gasterop. et Cephalop. Craie Super, du Limbourg, p. 61, pi. 6, f. 2 



a, b, c. 



Cretaceous of Belgium. 



"D. CALIFORNICUM Stanton, 1895. Bull. U. S. Geol. Surv. No. 

 123, p. 62, 63, pi. xii, fig. 3. 



Cretaceous (Knoxville beds') California. 



D. CHILENSE D'Orbigny, 1847. Voy. Pole Sud, (Astrolabe and 

 Zelee) Geology, pi. iv, fig. 37, 38. 



Cretaceous, Chili. 



D. CIDARIS Geinitz, 1849. Quadersandsteingebirge, p. 144. New 

 name for D. striatum Geinitz, 1839, not of Sowerby. 



D. striatum GEINITZ, 1839 (not of Sowerby). Charac. Schicht. 

 u. Petrifac. Saechs. Kreidegebirg., p. 74, pi. 18, fig. 27. 



D. striatum " Sowerby," MANTELL, Geol. of Sussex, etc., p. 87, 

 pi. 19, f. 28; Reuss, Verstein. Bohm. Kreideform., p. 41, pi. 11, f. 

 18. (Not of Sowerby, 1812, nor of Born, 1780). 



D. reussianum RYCKHOLT, 1852. Mem. Couronn. Acad. Roy. 

 Sci. Belg., Vol. xxiv, p. 70. 



Cretaceous, Belgium, Saxony and England. 



D. CCELATULUM Baily (in Salter), 1857. Quart. Jour. Geol. Soc. 

 Lond., Vol. xiii, p. 87, pi. ii, fig. 8. 



Cretaceous, Upper Greensand, Aberdeenshire. 

 D. COMPRESSUM D'Orbigny, 1850. Prodr. Paleont. Strat., Vol. 

 i, p. 233, No. 135. 



Jurassic, France. 



D. CONFUSUM Sharp & Pilsbry, 1898. New name for D. alter- 

 nans, Ryckholt, Mem. Couronnes et Mem. des Savants Etrangers, 

 pub. par 1'Acad. Roy. Sci. de Belgique, 4to, xxiv, 1850, 1851, p. 

 71, pi. 2, f. 45, 46 (1852). Not D. alternans Chenu, 1842. 



Turonien, at Vise, Belgium. 



