540 PLIOCENE MOLLUSCA. 



Dimensions. — L. 24 mm. B. 10 mm. 



Distribution. — Not recorded living. 



Fossil: Newbournian Crag: Walclringfield. 



Bemarhs. — The fossil described under this name was discovered by Mr. Bell in 

 the Cavell Collection at Framlingham College, and is now figured by the permission 

 of the Principal of that institution. In the default of finding anything recent or 

 fossil with which it might be identified, I have named it after the late Mr. Cavell, 

 of Saxmundham, formerly a zealous collector from the Crag deposits of Suffolk. 

 I submitted a photograph to M. de Boury, who agreed with me that it is new, 

 and that it should be referred to a special sub-genus, Lepidoscala. 



8ub-genus FUSCOSCALA, Monterosato, 1890. 

 Scala (Fuscoscala) tenuicosta (Michaud). Plate XLVIII, figs. 17, 18. 



1819. Turbo Turtonis, Turton, Conch. Diet., i>. 208, pi. xxvii, fig. 97. 



1829. Scalaria tenuicosta, Michaud, Bull. Soc. Linn. Bordeaux, vol. iii, p. 260, fig. 1. 



1836 — 44. Scalaria flanicosta, Philippi, Eaum. Moll. Sic, vol. i, p. 168, pi. x, fig. 4, 1836; 



8. tenuicosta, vol. ii, p. 145, 1844. 

 1853. Scalaria Turtonis, Forbes and Hauley, Brit. Moll., vol. iii, p. 204, pi. Ixx, figs. 1, 2. 

 1859. Scalaria Turtonis, G. B. Sowerby, 111. Ind. Brit. Shells, pi. xv, fig. 18. 



1867—69. Scalaria Turtonx, Jeffreys, Brit. Conch., vol. iv, p. 89, 1867 ; vol. v, pi. Ixxi, fig. 2, 1869. 

 1871. Scalaria tenuicosta, Nyst, Ann. Soc. malac. Belg., vol. vi, p. 138, no. 312 

 1873 — 76. Scalaria Turtonse var. tenuicosta, Segueuza, Boll. R. Com. Greol. Ital., vol. iv, p. 354, 



no. 321, 1873; vol. vii, p. 96, no. 609, 1876. 

 1878. Scalaria Turtome, G. O. Sars, Moll. Reg. arct. Norv., p. 359. 

 1884. Scalaria tenuicosta, Bucquoy, Dautzenberg et Dollfus, Moll. mar. Rouss., vol. i, p. 243, 



pi. xxiii, figs. 12, 13. 

 1889 — 91. Scalaria tenuicosta, Sacco, Boll. Soc. Greol. Ital., vol. viii, p. 352, no. 1883, 1889; Scalaria 



(Fuscoscala) Turtonis and vars., Moll. Tei-r. Terz. Piem., pt. ix, p. 15, pi. i, figs. 16 — 21, 1891. 

 1890. Scalaria tenuicosta, de Boury, Boll. Soc. Malac. Ital., vol. xiv, p. 282, no. 66. 

 1890. Scalaria tenuicostata, Cams, Prod. Faun. Medit., vol. ii, p. 291. 

 1892. Scalaria tenuicosta, Locard, Coq. mar. Cotes de France, p. 126. 

 1892. Scalaria turtonve, Praeger, Proc. Roy. Irish Acad. [3], vol. ii, p. 262. 

 1905. Scala {Fuscoscala) tenuicostata, Kobelt, Icon, schalentrag. europ. Meeresconch., vol. iii, pp. 9, 



11, pi. Ixi, figs. 1 — 5. 

 1912. Scala (Fuscoscala) tenuicosta, Cossmann, Ess. Paleoconch. compar., vol. ix, p. 38. 

 1914. Scala tenuicosta, Cerulli-Irelli, Palaeont. Ital., vol. xx, p. 235, pi. xxi, figs. 10, 11. 



Specific Characters.— 'i^heW slender, conical; whorls 14 — 18, slightly convex; 

 ornamented by discontinuous costfe, about 12 on the body-whorl, sinuous or 

 oblique and rather irregular, occasionally varicose, extending to the base of the 

 shell, also by excessively fine inconspicuous spiral striae ; spire elongato-subulate, 

 regularly diminishing in size towards the apex; suture well-marked, but not deep; 

 mouth subcircular ; peristome continuous; without basal ridge. 



