PLEUROTOMARIA. 
297 
Affinities. — ScJi. tseniatum, Goldfuss,^ and 8ch. fasciatum, Goldfuss,^ besides 
having elevated sinus-bands, are also distinguished by the possession of a few more 
spiral ridges on their whorls- 
14. Pleurotomaria delphinuloidbs, ScJilotheim, sp. PL XXVIII, figs. 10 — 13. 
1821. Helicites DELPHiNTJLOiDES, ScMotheim. Petrefact., p. 102, p. xi, fig. 4. 
1842. Pleueotomabia delphinuloides, d'Archiac and de Verneuil. Geol. Trans., 
ser. 2, vol. vi, pt. 2, p 361, pi. xxxiii, 
figs. 4, 4 a. 
1843. — 8TJBL.a!Vis, F. A. Bdmer. Verst. Harzgeb., p. 27, pi. vii, fig. 9, 
" ? 1843. ExJOMPHALUS DiONYSii ? F. A. Bdmer. Ibid., p. 30, pi. viii, figs. 3 a, b. 
1844. ScHizosTOMA DELPH1NULOIDE8, Qoldfuss. Petref. Grerm., vol. iii, p. 78, pi. 
clxxxviii, figs. 3 a — d. 
1853. Pletjeotomaeia DELPHiNUL.aiPOEMis, Satidberger. Verst. Ehein. Nassau, 
p. 188, pi. xxiii, figs. 1, 1 a—e. 
1860. — DELPHiNtTLifOEMis, McJiwald. Lethaea Rossica, p. 1172, 
pi. xliii, figs. 3 a, h. 
1874. ■ — LXDIA, Billings. Palaeozoic Fossils, vol. ii, pt. 1, p. 62, 
pi. V, figs. 4, 4 a. 
1876. — DELPHINULOIDES, F. Bomer. Leth. Pal., pi. xxxii, fig. 7. 
1884. — STJBL.aivis, Clarice. Neues Jahrb. f. Min., Beil.-Bd. iii, 
p. 340. 
1887. — ViENNATi, (Ehlert. Bull. Soc. d'Etud. Sci. d'Angers, 
p. 30, pi. ix, figs. 2, 2 a, b. 
1887. — Melttikovi, TscJiernyschew, Mem. Com. Greol. Euss., vol. 
iii, No. 3, p. 169, pi. v, figs. 8 a — c. 
1889. — DELPHINULOIDES, WJiidbome. Geol. Mag., dec. 3, vol. 
vi, p. 30. 
Description. — Shell sometimes very large, turbiniform, more or less elevated, 
of four or five rather slowly increasing volutions. Spire rather variable in height, 
broadly conical, symmetrical with the body-whorl, generally exposing the greater 
part of the whorls. Suture deep, narrow, acute. Whorls roundly convex, 
sub-circular or sub-elliptic, arching horizontally or obliquely from the suture to the 
back, which is generally flatly perpendicular for a short distance, and then curving 
more or less in to the lower suture, or in the case of the body-whorl arching round 
the base to the umbilicus with a deep symmetrical curvature. Sinus-baud very 
broad, supra- sutural, flat or slightly convex, level with the rest of the surface, 
situated slightly, above the centre of the back, generally bounded by very fine, 
low, raised, rounded threads or blunt angles, and sometimes bisected by an indis- 
^ 1844, Goldfuss, ' Petref. Germ.,' vol. iii, p. 79, pi. clxxxviii, figs. 4 a — e. 
' Ibid., p. 79, pi. clxxxviii, figs. 5 a, b. 
