554 PLIOCENE MOLLUSCA. 



Distribution. — Not known living. 



Fossil: Icenian Crag : Sudbourn Cliurcli-walks. 



liemavhs. — The imperfect specimen here alluded to, now in the York Museum, 

 was figured bj "Wood as a variety {jpseudo-Turtoni) of 8. Turtoni {op. cit.). M. de 

 Boury pointed out, however, that the presence of a thin basal ridge, alluded to by 

 Wood and clearly though faintly marked in his drawing, shows it to belong to a 

 different group of the Scalidge, viz. to Gi/roscala. He did not agree with Mr. Bell's 

 reference of it to ^S'. pseudo-scalavis, but considered it new and a distinct species. 

 He retained Wood's varietal name psewt^o-jT^r^o/^i as specific, in which I follow him. 



Sab-genus PLICISCALA, De Boury, 1887. 

 Scala (Pliciscala) obtusicostata (S. V. Wood). Plate XLVIII, figs. 24, 25. 



1842—48. Scalaria obtMsicostata, S. V. Wood, Aim. Mag. Nat. Hist. [1], vol. ix, p. 535, 1842 ; Mon. 

 Crag Moll., pt. i, p. 95, pi. viii, fig. 21, 1848. 



1871. Scalaria obtusicostata, Jeffreys in Prestwich, Quart. Journ. Geol. Soc, vol. xxvii, p. 145. 



1872. Scalaria obtusicostata, A. and R. Bell, Proc. Geol. Assoc, vol. ii, p. 204. 

 1890. Scalaria obtusicostata, C. Reid, Plioc. Dep. Erit., p. 256. 



1918. Scalaria (Pliciscala) obtusicostata, de Boury, MS. 



nfic Gharacters.^i^heW minute, fragile; whorls 8 or 10, convex; spire 

 regularly tapering to a sharp point; ornamented by numerous and fine longitudinal 

 ribs and by delicate and inconspicuous spiral ridges ; suture well marked ; base 

 marginated, flattened; mouth sub-circular; peristome continuous. 



Dimensions. — L. 6 — 8 mm. B. 2 — 3 mm. 



Distribution. — Not known living. 



Fossil: Coralline Crag : Sutton. 



BemarJis. — This small shell, originally described by AVood in 1848, has only 

 been recorded from the Coralline Crag of Sutton, from which locality there are a 

 fair number of specimens in his collection at the Norwich Museum. In 1878 

 Prof. G. 0. Sars described some small Scalas from Finmark and the Norwegian 

 coast, one of which, on the authority of Jeffreys, he identified with the Crag 

 8. obtusicostata,^ and the other with that originally referred by Wood to *S^. varicosa, 

 Lamarck (afterwards 8. funiculus^"). In 1884 {op. cit.) Jeffreys stated that in 

 consultation with Prof. Sars and after further examination of his specimens, he had 

 come to the conclusion that both of these shells belonged to the same species, which 

 he considered new and named 8. coarctata.^ They may belong to the same group 

 as the Crag 8. obtusicostata, having a marginated and flattened base and numerous 

 costge, but I do not think they are the same as the Crag shell, 



1 Moll. Reg. Arct. Norw. (1878), pp. 195, 348, pi. xxii, figs. 9 a, 9 6; pi. xxxiv, fig. 9. 



2 Mon. Crag Moll., 1st Suppl., pt. i, p. 98, 1872 ; pt. ii, p. 207, 1874. 



3 Proc. Zool. Soc. Lond. (1884), p. 139. 



