323 
DEVONIAN FAUNA. 
184.2. Belleeophon" steiatus, d'Archiac and de Verneuil. Qeo\. Trans., eer. 2, 
vol. vi, pt. 2, pp. 353 and 389, pi. xxviii, fig. 6. 
1843. — — ?, F. A. Romer. Verst. Harzgeb., p. 32, pi. ix, 
figs. 4 a, b. 
1848. — — Bronn. Index Palaeont., p. 164. 
1849. — — d'Orhigny. Prodrome, vol. i, p. 72. 
? 1849. — SowEEBTi, d'Orbigny. Prodrome, vol. i, p. 126. 
1850. — STEIATUS, F. A. Burner. Beitr., pt. 1, p. 33. 
1851. — — Bronn. Lethaea, 3rd edit., pt. 2, p. 442, pi. i, 
figs. 11a — c, and pi. iii^, figs, 19 «, h. 
1853. — LINEATTJS, Sandherger. Verat. Ehein. Nassau, p. 179, 
pi. xxii, figs. 5, 5ffl — h. 
1854. — STEIATUS, Morris. Catal. Brit. Poss., p. 288. 
? 1854. — SowEBBTi, Morris. Ibid., p. 288. 
1855. — STEIATUS, M'Coy. Synopsis Brit. Pal. Eocks, p. 400. 
1861. — Pelops, Hall. Descr. New Sp. Fossils, p. 28. 
1862. — — — Fifteenth Eeport N. Y. State Cab. Nat. 
Hist., p. 56. 
1869. — LiNEATUS ?, Zeuschier. Zeitsch. Deutsch. Geol. GeselL, 
vol. xxi, p. 267. 
? 1871. — PEOPiN-QUUS, Meeh. Proc. Acad. Nat. Sci. Phil., p. 78. 
? 1873. — — — aeol. Surv. Ohio, Pal., vol. i, p. 226, 
pi. XX, figs. 4 a, b. 
1876. — STEIATUS, F. Bomer. Lethsea Pal., pi. xxxii, fig. 9. 
1879. — . Pelops, Hall. Pal. N. T., vol. v, pt. 2, p. 95, pi. xxii, 
figs. 7 — 13 ; pi. xxvi, fig. 1. 
? 1883. — Meeki, de Koninch. Ann. Mus. Eoy. H. N. Belg., vol. viii, 
pt. 4, p. 138, pi. xlii bis, figs. 24—26. 
? 1883. — AFFiNis, de Koninch. Ibid., p. ] 38, pi. xlii bis, figs. 18 — 20. 
1883. — STEIATUS, Tryon. Structural Conch., vol. ii, p. 322, 
pi. Ixxxii, fig. 95. 
1884. — STEIATUS ?, Clarke. Neues Jahrb. f. Min., Beil.-Band iii, 
p. 347. 
? 1887. — SowEEBYi, Fischer. Manuel Conchyl., p. 853, fig. 601. 
1888. — — Etheridge. Foss. Brit., vol. i. Pal., p. 165. 
? 1888. — — — Ibid., p. 293. 
1889. — Pelops, Barrois. Faun. Cale. d'Ebray, p. 210, pi. xv, 
figs. 14 a, b. 
Description. — Shell of median size, involute, horizontally symmetrical. Spire 
and umbilicus deep, rather open. Whorls rising from the suture and curving 
very rapidly round to the back, which is rounded, but rather obliquely flattened 
above and below, and meets in the centre in a small prominent squared keel. Keel 
bounded by very fine threads. Ornament consisting of delicate, sharp, distant, 
transverse ridges, much recurved on the keel, and proceeding from it at first 
nearly perpendicularly on each side, but bending obliquely forward and occasionally 
coalescing as they approach the suture ; these ridges in some specimens com- 
