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426 Newberry. Ann. Sci., Cleveland, vol. 1, 1853, p. 106. D. White: Bull. Geol. Soc. Am., vol. 6, 1895, p. 317. [Pottsville group; Sewell formation.]

Fontaine & I. C. White. Second Geol. Surv. Pa., Rept. Progr. PP, 1880, p. 101, pl. xxxviii, fig. 4. [Dunkard formation (Permian).]

Fontaine & I. C. White. Second Geol. Surv. Pa., Rept. Progr. PP, 1880, p. 102, pl. xxxiii, figs. 1-3. [Dunkard formation (Permian).]

(Geinitz) Grand 'Eury. Fl. Carb. Dept. Loire, Paris, 1877, p. 236, pl. xxvi, fig. 19. D. White: Bull. Geol. Soc. Am., vol. 11, 1900, p. 171. [Conemaugh formation.]

(Lesquereux) D. White. Bull. Geol. Soc. Am., vol. 11, 1900, p. 169. [Pottsville group i Kanawha formation.]

Lesquereux. Second Geol. Surv. Pa., Rept. Progr. P (Coal Fl.), vol. 3, 1884, p. 804, pl. cix, figs. 5, 6. D. White : Bull. Geol. Soc. Am., vol. 11, 1900, p. 169. [Pottsville group; Kanawha formation.]

Dawson. Quart. Jour. Geol. Soc., London, vol. 18, 1862, p. 324, pl. xiii, figs. 23, 24. D. Wrhite : Bull. Geol. Soc. Am., vol. 11, 1900, p. 162. [Pottsville group; Kanawha formation.]

(Sternberg) Newberry. Ann. Sei., Cleveland, vol. 1, 1853, p. 153, text-fig. 7. D. White: Bull. Geol. Soc. Am., vol 6, 1895' p. 318. [Potts ville group; Nuttall sandstone lentil of Sewell formation.]

Newberry. Ann. Sei., Cleveland, vol. 1, 1853, p. 153, text-fig. 4. D. White: Bull. Geol. Soc. Am., vol. 11, 1900, p. 165. [Potts ville group; Sewell and Kanawha formations.]

Lesquereux. Second Geol. Surv. Pa., Rept. Progr. P, 1884, p. 818, pl. cxi, figs. 25, 26. Lacoe, in Millspaugh : Bull. No. 24, W. Va. Agric. Exp. Sta., Morgantown, 1892, p. 526. [Pottsville group ; Kanawha formation.]

Newberry. Ann. Sei., Cleveland, vol. 1, 1853, p. 153, text-fig. 6. D. White : Bull. Geol. Soc. Am., vol. 6, 1895, p. 317. [Pottsville group; Sewell formation.]

(Presl) Lesquereux. Second Geol. Surv. Pa., Rept. Progr. P (Coal Fl.), vol. 2, 1880, p. 578, pl. lxxxv, figs. 22, 23. D. White : Bull. Geol.