SCALA (HYALOSCALA) MINUTA. 555 



8Mh-<jfiinis HYALOSCALA, dc Boury, 1890. 

 Scala (Hyaloscala) minuta (.T. Sowoiby). Plate XL VIII, figs. 34 — 37. 



1823. Scahvia minnfa, J. Sowerhy, Miii. Conch., vol. iv, p. 125, pi. ccc.xc, figs. 3, 4. 

 1833. Scalaria mitiiifa, S. Woodward, (Jcol. Norfolk, p. 44. 



1842—48. Scalaria clafhrafula, S. V. Wood, Ann. Mat;-. Nat. Hist. [1], vol. ix, p. 535 (pt.), 1842 ; 

 Mon. Crag Moll., pt. i, p. 94, pi. viii, fig. 19 I, 1848. 



1871. Scalaria clafliratula, Jeffreys in Prestwicli, Quart. Jouru. Geol. Soc, vol. xxvii, pp. 145, 491. 

 1871—81. Scalaria clathratula, Nyst, Ann. Soc. malac. Belg., vol. vi, p. 108, no. 5(3, 1871 ; Concli. 



Terr. tert. Belg., p. 88, pi. vi, fig. 16, 1881. 



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

 1874—92. Scalaria clathratula. Van den Broeck, Ann. Soc. malac. Belg., vol. ix, p. 292, 1874 ; 



vol. xvii, p. 154, 1883; Bull. Soc. Beige Geol., vol. vi (Menioires), pp. 123, 147, 1892. 

 1885. Scalaria clathratula, Lorie, Arch. Mus. Teyler [2], vol. ii, pp. 184, 230. 

 1890. Scalaria clathratula, C. Keid, Plioc. Dep. Brit., p. 256. 



1911. Scalaria minuta, A. Bell, Journ. Ipswich Field Club, vol. iii, p. 16. 



1912. Scalaria clathratula, Tesch, Med. v. d. Rijks. v. Delfstoffen, no. 4, p. 70, no. 156. 

 1912. Hyaloscala minuta, Cossmaun, Ess. Paleoconch. compar., vol. ix, p. 40, ]d. i, fig. 45. 



Specific GUaractevs.' — Shell imperforate, varying in size both in length and 

 comparative width, subulate, turreted ; whorls 8, convex, contiguous, the last not 

 much expanded ; ornamented by numerous delicate and lamelliform costce, variable 

 in number, slightly pointed above ; suture rather deep ; spire slender and elongate ; 

 mouth subcircular, outer lip reflected, with an elevated margin. 



Dimensions. — L. 5 — 12 mm, B. 2 — 5 mm. 



Distribution. — Not recorded living. 



Fossil: Lenham. Coralline Crag: Sutton, Gomer, Boyton. 

 Newbournian : Newbourn. Icenian : Thorpe near Norwich, Yarn Hill. 



Scaldisien : Holland. Casterlien (zone a Isocardid cor), Scaldisien, Poederlien : 

 Belgium. 



Remarks. — The Crag shells originally described by Sowerby as a new species 

 under the name of 8. minuta, have been for many years identified with the recent 

 Turbo cJathratulus of Gr. Adams. M. de Boury and M. Cossmann, however, have 

 recently urged that this has been a mistake, proposing to revive for them 

 Sowerby's original name of 8. minuta. M. de Boury believes, indeed, that the 

 recent 8. clathratida is unknown as a Pliocene fossil. 



As stated above, 8. minuta, which is exceedingly common in the Coralline Crag, 

 varies both in length and width, as shown in the figures here given (PI. XL VI II, 

 figs. 34 to 37); all of these have been submitted to and approved by M. de Boury as 

 typical specimens of that species. Sowerby's figure is that of a minute form not 

 unlike my fig. 37. One of Wood's, which is much larger, corresponds more nearly 

 with my fig. 34. The latter writer says, moreover, that the shells have a varying 



