mOCERAMUS. 2G9 



IvoccraiDits, but subsequently it possesses the characters of Acfinoccvaviuff. Also 

 it appears that a somewhat similar plication has originated independently in /. 

 Salomoni (p. 263), and probably too in I. radians, Schliiter,^ and I.fasciatus, Miiller.^ 



Pictet and Eoux regarded suhsulcatiis as a variety of I. sulcafns in which the 

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

 evidence of the extensive series of specimens of suhsulcatus which has now been 

 obtained are opposed to this view. 



Distribntion. — Lowest zone of the Upper Gault of Folkestone. Upper Green- 

 sand of Blackdown. Red Limestone of Hunstanton. 



Inocebamus sui.catus, Parl-mson, 1819. Plate XLVII, figs. 15—20. 



1819. Inocebamus sulcatus, J. Parlcinson. Trans. Cleol. Soc, ser. 1, vol. v, p. 59, 



pi. i, fig. 5. 



1821. — — J. Sowerhy. Miu. Couch., vol. iii, p. 184, pi. cccvi, 



figs. 1—7. 



1822. — — G. ManfeU. Foss. S. Downs, p. 95, pi. xix, fig. 16. 

 — — — A. BroiKjiiiart in Cvvier. Ossemens Foss., vol. ii, 



pt. ii, pp. 333, 336, pi. vi, fig. 12. 



1836. — —A. GoWfuss. Petref. Germ., vol. ii, p. 112, pi. ex, 



fig. 1. 



1837. — — W. HisiiHjer. Letlisea Suecica, p. 56, pi. xvii, fig. 9. 

 1846. — — A.d'Orbiijvy. Pal. Fran?. Terr. Cret., vol. iii, p. 504, 



pi. cccciii, figs. 3 — 5. 

 1850. — —A. iVOrligny. Prodr. cle Pal., vol. ii, p. 139. 



1853. — — F. J. Pictet and W. Eoux. Moll. Foss. Gres verts cle 



Geneve, p. 499, pi. xlii, 

 figs, la-c (not d-f). 



1854. — — /. 3Iorr{s. Cat. Brit. Foss., ed. 2, p. 170. 



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



1864. AcTiNOCEKAMus stTLCATUs, J^. B. Meek. Clieck List Cret. Foss. N". Amer. 



(Smithson. Miscell. Coll., No. 

 177), p. 32. 

 1869. Inocebamus sulcatus, F. J. Pictet and G. Campiclie. Foss. Terr. Cret. 



Ste. Croix (Mater. Pal. Suisse, 

 ser. 5), \). 105. 

 1875. — — A. J. Jukes-Browne. Quart. Journ. Geol. Soc, vol. 



xxxi, p. 298. 

 1877. — — C. ScJdiiter. Palseontographica, vol. xxiv, p. 266. 



1884. — (AcTiNOCEEAMUs) SULCATUS, /. F. Whiteaies. Mesozoic 



Fossils, vol. i (Geol. Surv. 



Canada), p. 241, pi. xxxii, 



H^ 



1 ' PalEeontographica,' vol. xxiv (1877), p. 270, pi. iii, fig. 2. 



"~ ' Jalirb. d. k. preuss. geol. Lande^aust. fiir' 1887 (1888), p. 416, pi. xviii, fig. 3. 



36 



