INOCERAMUS. 209 



l-iioceramnx, l)iit subsequently it possesses the chai'actcrs of Arlinorerniinis. Also 

 it appears that a somc^Yllat similar plication has originated independently in I. 

 Salumoni (p. 263), and probably too in 1. radians, Schli'itei',' and 1. fascial as, Miiller." 



Pictet and Roux I'egarded snhKuIcatiis as a variety of /. milratus in ■which the 

 number of plications had decreased ; the stratigraphical distriljution and also the 

 evidence of the extensive series of specimens of .suhsiilcahis which has now been 

 obtained are opposed to this view. 



Distrihittioii. — Lowest zone of the Upi)er Gault of Folkestone. Upper Green- 

 sand of Blackdown. Red Limestone of Hunstanton. 



Inocekamds sulcatus, rarliusou, 1819. Plate XLVII, figs. 15—20. 



1819. Inocekamus svj^catvs, J. Parkinson. Trans. Geol. Soc.ser. 1, vol. v, p. .50, 



pi. i, fit;;. 5. 



1821. — — J. Sowcrliij. Mill. Conch., vol. iii. p. 184, ])1. ccevi, 



figs. 1 — 7. 



1822. — — G. Matitell. Foss. S. Dowus, p. 95, pi. xi.x, fig. 16. 

 — — — A. Brotiijniart in Citvier. Osscinens Foss., vol. ii, 



pt. ii, j.p. 333, 336, pi. vi, fig. 12. 



1836. — —A. Gohlfms. Petruf. Gonn., vol. ii, p. 112, ].l. ex, 



fig. 1. 



1837. — — W. Hi.<iii</rf. Lethsea Suecica, p. 56, pi. xvii, fig. 9. 

 1846. — A. (VOrhiijrnj. Pal. Fianr. TeiT. Cret., vol. iii, p. 504, 



[.l. ccctiii, figs. 3 — 5. 

 1850. — — A.frOrhlijtiij. Pimlr. de Pal., vol. ii, p. 139. 



1853. — — F. J. Piclet and W. liuiLi: Moll. Foss. Grcs verts dc 



Geneve, p. 499, pi. xlii, 

 figs. li(-c (not d-f). 



1854. — —J. Morrie. Cat. Brit. Foss., e.l. 2, p. 170. 



1855. — — G. Cotleati. Moll. Foss. de I'Yonne, p. 107. 



1864. AcTiNOCERAMUs scLCATUs, F. IS. Meek. Check List Ciet. Foss. N. Amer. 



(Smithson. Miscell. Coll., No. 

 177), p. 32. 

 1869. Inocekamus stjlcattjs, F. J. Ficlet and G. Campiche. Foss. Terr. Cri't. 



Ste. Croix (Mater. Pal. Suisse, 

 ser. 5), p. 105. 

 1875. — — A. J. Jiikcs-Broune. Quart. Jomu. Geol. Soc., vol. 



xxxi, p. 298. 



1877. — C. Schliiler. Pala?ontogTapLiea, vol. xxiv, j). 266. 



1884. (AcTJNOCEBAMUs) SULCATUS, J. F. Whilcaiif. Mcsozoic 



Fossils, vol. i (Geol. Siirv. 

 Canada), p. 241, pi. xxxii, 

 fig. 3. 



1 ' Palttontographica,' vol. xxiv (1877), \>. 270. pi. iii, fig. 2. 



2 ' Jahrb d k i.rcuss. gcol. Landesansf. ffir' 1887 (1888), p. 416. pi. xviii, fig. 3. 



30 



