INOCERAMUS. 203 



Affinities. — Sec I. (nif/liciis (p. 201). 



/. iieocomtensis appears to be allied to ./. Kivuhli, Scliliiter,' of wliicli only one 

 figure has yet been published. 'I'li(> differences seen are in the greater relative 

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

 ribs of 1. ncocomiensis.^ 



Iieiii(ni'f<. — This species was first recorded in England by Fifton. Onlv 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 

 distiiu-tly limited. The English specimens are not sufficient to show whether the 

 inefpmlity of the valves is as great as in irOibigny's figure. 



7//y(''. — Prof. Boule informs me that d'Oibigny's figures are restorations based 

 on two specimens from the Barreiuian of Bettancourt. The types are in the 

 Natural History Museum, Paris. 



Disfrihiition. — Lower Greensand (Fitton's Bed 13) of Atherfield. ITythe l^eds 

 of Lympne. Lower Greensand of Nutfield. 



IXOCEIIAMUS, Sp. 



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

 been found in the Speeton Clay (zone of Belemnites Idfi'nili.s) and in the Spilsby 

 Sandstone of Holton and Acre House. 



L\ocei;amus Salomoni, iVOrhifjny, 1850. Plate XLV, figs. 3 — 7. 



1850. Inoceramus Salomoni, A. d'Orhujny. Prodr.de Pal., vol. ii, p. 13!*. 

 1853. — — F.J.PiddandW.Roux. Moll. Fo.ss. Gros vorts 



de Gfiu-ve, p. 5Ul, 

 pi. xlii, fig. 3. 

 1855. — — G. Coiteau. Moll. Foss. de rYonue, p. 107. 



1869. — — F. J. Pictet ami G. Campkhe. Terr. Crtt. Ste. 



Croix (Mater. Pal. Suisse, 

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

 5—8. 



Defrrijjtioii. — Lcit 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 nc^arly perpendicular to the plane l)etween the 

 valves, and concave near the umlio. I'mbo anterior, prominent, pointed, incurved. 



' See footuotc on p. 267. 



= Compare also forms des(ri))ed bv Schmidt as allied to /. ne<,coniit'ii>'is, 'Mi'm. Aead. Iiii].. Sei. 

 St. Petersb.,' ser. 7, vol. xviii (lS72), pp. 155—161, pi. ii, fig. 8, pi. iii. figs. 6—9. 



