DENTALIUM, PALAEOZOIC. 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^VE Hall, 1877. New name for D. obsoletum Hall, 

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



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

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



Coal measures of Iowa. 



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

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



Carboniferous, " Stringocephaluskalk" Nassau, Germany. 



D. TENUISSIMUM Koninck, 1876. Palseont. Nouv.rGalles du 

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



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



D. VENUSTUM Meek & Worth en, 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. 



Entails waleiodorensis KONINCK, Ann. Mus. Roy. d'Hist. Bel- 

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



Carboniferous, Belgium. 



Family SIPHONODENTALIILXE. 



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 : 



