DENTALIUM, PALEOZOIC. 231 



D. granosum var. Icevigatum EICHWALD, 1860. Lethsea Rossica, 

 Vol. i, pi. 40, fig. 11, no text. 



Orthocer allies limestone, Poulkova, Russia. 



D. HERCULEUM Koninck, 1863. Quart. Journ. Geol. Soc. 

 London, Vol. xix, p 8, pi. iv, figs. 10-12. 



Entalis herculea WAAGEN, Mem. Geol. Surv. India, Productus 

 Limestone fossil?, p. 181-182, pi. xvi, figs. 1, 2, 3 (1887). 



Carboniferous " Productus Limestone" Salt Range, India. 



D. IBERGENSE Rremer, 1855. Geol. Kennt. n.-w. Hartzgebirges. 

 Palseontographica, Vol. v, p. 36, pi. vii, fig. 7. 



Upper Devonian, Iberg White Chalk, Hartz Mountains. 



D. ILLINOIENSE Worthen, 1883. Geol. Surv. of Illinois, Vol. 7, 

 p. 325. 



Subcarboniferous ; Lowest beds of the Chester limestone (KaskasJcia 

 Group), Chester, Illinois. 



D. INGENS Koninck, 1841. Descr. Anim. foss. terrain Carbon- 

 ifere Belgique, p. 317, pi. 22, fig. 2. Ann. Mus. d'Hist. Nat.Belg., 

 viii, pt. 4, p. 217, pi. 49, f. 10-12, 18, 19 (1883). 



Carboniferous, Vise, Belgium. 



A large species, sbaped like D. ceras, but smooth with circular 

 instead of longitudinal wrinkles. It attains a length of 200 mill. 



D. incequale RYCKHOLT, 1852, not of Bronn, 1831. Mem. Cou- 

 ronn. Acad. Roy. Sci. Belg., Vol. xxiv, p. 67-68, pi. ii, figs. 41-42. 

 (Carboniferous at Vise)=D. ingens de Kon., internal cast. 



D. INORNATUM M'Coy, 1844. Synops. Garb. Foss. Ireland, p. 47, 

 pi. 5, f. 30. R. ETHERIDGE, Geol. Mag. (dec. ii), iv, p. 248, pi. 

 13. f. 1. 



Carboniferous, Ireland; and " Ardross limestone," near Elie, Fife, 

 Scotland. 



D. MARTINI Whitfield, 1882. Ann. N. Y. Acad. Sci., Vol. ii, p. 

 203 ; Rep. Geol. Surv. Ohio, vii, p. 423, pi. 3, f. 10. 



Devonian, Upper Helderberg limetone, near Dublin, Ohio. 



D. MEEKIANUM Geinitz, 1866. Garb, und Dyas in Nebraska, 13, 

 pi. 1, f. 20 ; Geol. Surv. Illinois, Vol. v, p. 590, pi. 29, f. 8. 



Carboniferous, Danville, Illinois. 



D. MISSOURIENSE Swallow, 1863. Trans. Acad. Sci. St. Louis, 

 Vol. ii, p. 99. 



Subcarboniferous, KaskasJcia Group, Chester, Illinois, and St. 

 Mary's, Mo. 



