538 PLIOCENE MOLLUSCA. 



8ub-genns NOBILISCALA, de Boury, 1917. 

 Scala (Nobiliscala) foliacea (J. Sowerby). Plate XLVII, fig. 25. 



1823. Scalaria foliacea, J. Sowerby, Miu. Conch., vol. iv, p. 125, pi. cccxc, fig. 2. 

 1842—48. Scalaria foliacea, S. V. Wood, Ann. Mag. Nat. Hist. [1], vol. ix, p. 635, 1842 ; Mou. Crag 

 Moll., pt. i, p. 93, pi. viii, fig. 17, 1848. 



1870. Scalaria foliacea, A. Bell, Jouru. de Couch., vol. xviii, p. 351, no. 373. 



1871. Scalaria frondosa, var., Jeffreys iu Prestwicli, Quart. Jouru. Geol. Soc, vol. xxvii, pp. 145,491. 

 IS-^l — 81. Scalaria foliacea, Nyst, Ann. Soc. malac. Belg., vol. vi, p. 108, no. 113, 1871; Couch. 



Terr. tert. Belg., p. 86, pi. vi, fig. 14, 1881. 



1872. Scalaria foliacea, A. and R. Bell., Proc. Geol. Assoc, vol. ii, pp. 204, 210, 214. 



1873. Scalaria foliacea, Seguenza, Boll. E. Com. Geol. Ital., vol. iv, p. 356, no. 327. 



1874 — 92. Scalaria foliacea, Yan den Broeck, Ann. Soc. malac. Bclg., vol. ix, p. 292, 1874; Bull. 



Soc. Beige Gcol., vol. vi (Mc'moires), pp. l33, 143, 147, 1892. 

 1889. Scalaria foliacea, De Gregorio, Ann. Gcol. Paleout., vol. vi, p. 6, pi. i, fig. 32. 

 1890—1917. Scalaria foliacea, de Boury, Boll. Soc. Malac. Ital., vol. xiv, p. 281, 1890; Clathrus (0 



foliaceus, vol. xv, p. 189, 1891 ; S. (Nohiliscala) foliacea, Jouru. de Conch., vol. Ixiii, p. 60, 1917. 

 1912. Scala (Clathrus) foliacea, Cossmann, Ess. Palcocouch. compar., vol. ix, p. 37. 

 1912. Scalaria foliacea, Tesch, Med. v. d. Eijks. v. Delfstoffen, no. 4, p. 70, no. 158. 

 1914. Scala (Clathrus) foliacea and vars., CeruUi-Irelli, Palaeout. Ital., vol. xx, p. 233, jjI. xxi, 



figs. 3-7. 



Specific Characters. — Shell tiirreted, imperforate; whorls smooth, convex, dis- 

 joined ; ornamented by 5 to 7 longitudinal ribs, oblique, lamelliform, thin, distant, 

 reflected; spire conical, elevated, regularly diminishing in size upward; mouth 

 circular, angulate above; peristome reflected ; base rounded, without a basal ridge. 



Dhneiisions. — L. 25 mm. B. 10 mm. 



Distribution. — Not known living. 



Fossil: Coralline Crag : Gedgrave, Sutton, Boy ton. Waltonian : 

 Walton-on-Naze, Beaumont, Little Oakley. Newbournian : Waldringfield, Sutton, 

 Felixstowe. 



Scaldisien : Belgium, Holland. 



(?) Pliocene : Biot, Asti, Monte Mario, Farnesina, Pisa. 



(?) Pleistocene : Reggio. 



Remarks. — 8. foliacea has been reported from several localities in the Coralline 

 Crag, where it is rather abundant, and from the earlier part of the Red Crag, 

 where it is less so. It is a special form, easily recognised by its folia ceous 

 costge, which are not so numerous as they are in other allied Crag species. Nyst 

 gives it from the Scaldisien of Belgium. His non-photographic figure, however, 

 supposing it to be accurate, which at present I have no means of ascertaining, 

 gives the impression of its being somewhat different from the Crag shell. It has 

 been called var. helgica by Prof. Sacco. Signor CeruUi-Irelli, moreover, figures 

 some specimens under the same varietal name, but these do not coii-espoud 



