INOCERAMUS. 263 



AJjinities. — See I. angliciis (p. 264). 



/. neocomiensis appears to be allied to I. Eictildi, Scliliiter,' of wliicli only one 

 figure lias yet been published. The differences seen are in the greater relative 

 height, the more inequilateral form, and the greater convexity of the curve of the 

 ribs of 1. neocomiensis.^ 



Remarhs. — This species was first recorded in England by Fitton. Only a few 

 specimens have been seen ; they agree fairly well with d'Orbigny's figure, but the 

 ribs appear to be better defined, and usually the posterior ear-like part is less 

 distinctly limited. The English specimens are not sufficient to show whether the 

 inequality of the valves is as great as in d'Orbigny's figure. 



Type. — Prof. Boule informs me that d'Orbigny's figures are restorations based 

 on two specimens from the Barremian of Bettancourt. The t^'pes are in the 

 Natural History Museum, Paris. 



Disfrihntiou.—hower Greensand (Fitton's Bed 13) of Atherfield. Hythe Beds 

 of Lympne. Lower Greensand of Nuffield. 



Inoceramus, sp. 



A few specimens of Inoceramns, not sufficiently perfect for description, have 

 been found in the Speeton Clay (zone of Belemnites latenilis) and in the Spilsby 

 Sandstone of Holton and Acre House. 



Inocehamlts Salomoni, cVOrhifjnij, 1850. Plate XLV, figs. 3 — 7. 



1850. Inoceeamus Salomoni, A. cVOrhhjmj. Prodr. de Pal., vol. ii, j). 139. 

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



de Geneve, p. 501, 

 pi. xlii, fig. 3. 

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



1869. — — F. J. Pictet and G. Camjnche. Terr. Cret. Ste. 



Croix (Mater. Pal. Suisse, 

 ser. 5), p. 109, pi. clx, figs. 

 5—8. 



Description. — Left valve inflated, subquadrate, very inequilateral. Length and 

 height nearly equal. Anterior half of valve very convex ; posterior half compressed. 

 Anterior end of valve more or less nearly perpendicular to the plane between the 

 vah^es, and concave near the umbo. Umbo anterior, prominent, pointed, incurved. 



1 See footnote on p. 267. 



2 Compare also forms described by Schmidt as allied to I. neocomiensis, 'Mem. Acad. Imp. Sci. 

 St. Petersb.,' ser. 7, vol. xviii (1872), pp. 155—161, pi. ii, fig. 8, pi. iii, figs. 6—9. 



