DENTALIUM, PALEOZOIC. 233 



D. SORBII King, 1850. Monogr. Permian Foss., p. 218. 

 D. sorbyi of some authors. 



D. speyeri GEINITZ, 1852. Jahresber. der Wetterauer Gesellsch., 

 1850-'51. p, 198. 



Permian : Ireland, Germany. 



D. SUBCANALICULATUM Sandberger, 1842. Jahrb. Min. u.Geol., 

 1842, p. 399 (no description); Verstein. Kheinischen Schichtensys- 

 tems Nassau, 1850-1856, p. 240, pi. 26, f. 19, 19a. 



" String ocephaluskalk," Villmar, Prussia. 



D. SUBL^EVE Hall, 1877. New name for D. obsoletum Hall, 

 1858, in Miller, 1st edition Amer. Palaeozoic Foss., p. 244. 



D. obsoletum HALL, 1858. Kep. Geol. Surv. of Iowa, i, pt. 2, p. 

 724, pi. 29, f. 16, 17. (Not of Schlotheim, 1832). 



Coal measures of loiva. 



D. TAENIOLATUM Sandberger, 1856. Verstein. Rhein. Schicht. 

 Nassau, 1850-56, p. 241, pi. 26, figs. 21-21a. 



Carboniferous, " String oeeplialuskalk" Nassau, Germany. 



D. TENUISSIMUM Koninck, 1876. Palseont. Nouv.-Galles du 

 Sud, pt. 2, p. 117, pi. 4, fig. 3. 



Devonian, Yass, N. S. Wales, Australia. 



D. VENUSTUM Meek & Worthen, 1861. Proc. Acad. Nat. Sci. 

 Phila., p. 145. 



Subcarboniferous, St. Louis limestone, Waterloo, Monroe Co., Illi- 

 nois. 



D. VERRUCOSUM Eichwald, 1856. Bull. Soc. Imp. Nat. Moscou, 

 Vol. xxix, pt. 2, p. 584 ; Lethsea Rossica, i, p. 1063, Atlas, pi. 40, 

 fig. 6. 



Carboniferous : Artiuskian stage of the Permian, Artiusk, Oural 

 Mts. 



D. WALCIODORENSE (Koninck), 1883. 



Entalis ivalciodorensis KONINCK, Ann. Mus. Roy. d'Hist. Bel- 

 gique, viii, pt. 4, p. 215, pi. 49, f. 16, 17 (1883). 



Carboniferous, Belgium. 



Family SIPHONOD'ENTALIID^. 



The earliest forms referable to this family appear in the middle 

 Cretaceous, the number of species rapidly increasing to the present 

 time, as shown in the following table : 



