560 PLIOCENE MOLLUSCA. 



1836 — 44. Melania Campanella, Philippi, Euuni. Moll. Sic, vol. i, p. 156, pi. ix, fig-. 5, 1836 : Chem- 



nitzia elegant issima, vol. ii, p. 136, 1844. 

 1848—84. Odostomia ladea, Jeffreys, Ami. Mag. Nat. Hist. [2], vol. ii, p. 348, 1848; Brit. Conch., 



vol. iv, p. 164, 1867 ; vol. v, p. 213, pi. Ixxvi, fig. 3, 1869 ; Proc. Zool. Soc. Loudon, p. 357, 1884. 

 1853. Chemnitzia elegantissima, Forbes and Hanley. Brit. Moll., vol. iii, p. 242, pi. xciii, figs. 1, 2. 

 1859. Chemnitzia elecjantissima, Gr. B. Sowerbv, 111. Ind. Brit. Shells, pt. xvi, fig. 1. 

 1873 — 76. Tnrhonilla lactea, Seguenza, Boll. R. Com. Geol. Ital., vol. iv, p. 354, no. 311, 1873 ; 



vol. vii, p. 92, no. 544, 1876. 

 1878 — 84. Odostomia (Turbonilla) elegantissima, Monterosato, Euum. e Sinon. Couch. Medit. 



(Griorn. Soc. Scien. Nat. Palermo, vol. xiii, p. 93), 1878; Nomeu. Gen. e Spec. Conch. Medit., p. 91, 



1884. 

 1883. Turbonilla lactea, Bucqnoy, Dautzeuberg et Dollfus, Moll. mar. Rouss., vol. i, p. 178, pi. xxi, 



figs. 6,7. 

 1890. Turbonilla lactea, Cams, Prod. Faun. Medit., vol. ii, p. 283. 

 1892. Turbonilla lactea, Locard, Coq. mar. Cotes de France, p. 139, fig. 123. 



1892. Turbonilla lactea and vai-s., Sacco, Moll. Terr. Terz. Piem., pt. xi, pp. 72 et seq., pi. ii, figs. 44 — 57. 

 1892. Odostomia lactea, Praeger, Proc. Roy. Irish Acad. [3], vol. ii, p. 264. 

 1892. Chemnitzia lactea, A. Bell, Rep. Torks. Phil. Soc, p. 63. 



1900. Odostomia lactea, Mai'shall, Journ. of Conch., vol. ix, p. 333. 



1901. Turbonilla lactea, 'Br0gger, Norges geol. Uudersi^gelse, No. 31, p. 661, pi. xvi, fig. 17. 

 1901. Turbonilla lactea. Conch. Soc List, Journ. of Couch., vol. x, p. 20, no. 455. 



1905. Turbonilla lactea, Kobelt, Icon, sehaleutrag. enrop. Meeresconch., p. 139, pi. Ixxii, figs. 17, 18. 



1913. Turbonilla lactea, Dautzeuberg et Durouchoux, Feuille des Jeunes Natur., vol. xliv, p. 38. 



1914. Turbonilla lactea, Cerulli-Irelli, Palaeont. Ital., vol. xx, p. 267, pi. xxiii, figs. 20 — 25. 

 1920. Turbonilla lactea, Dautzeuberg, Journ. de Conch., vol. Ixv, p. 54. 



Specific Chovacters. — Shell rather solid, slender, much elongated ; whorls 10 — 12, 

 moderately convex, gradually enlarging ; the last one-third to one-fourth the total 

 length ; ornamented by clearl}^ marked, strong and more or less flexuous, closely- 

 set ribs which terminate abruptly just l)elo\v the periphery, the base being smooth; 

 spire tapering to a rounded point ; suture narrow and rather deep, slightly oblique; 

 mouth small, subrhomboidal, angulate above, a little expanded at the base ; outer 

 lip gently rounded ; inner lip nearly straight below ; umbilicus none. 



Dimensions. — L. 7 — 9 mm. B. 1"75 — 2-25 mm. 



Distribution. — English, Bristol and St. George's Channels, Ireland, west coast 

 of Scotland, Aberdeen, Sandwich, Essex coast. Widely distributed from Finmark 

 to the Canaries, Mediterranean, Adriatic, ^Egean. 



Fo.'isil : St, Erth, Selsey, Largo Bay, Estuarine clays — Belfast. 



Holocene : Portrush. 



Italian Pliocene : Piedmont, Monte Mario, Livorno ; Sicily — Altavilla. 



Pleistocene : Messina, Monte Pellegrino, Taranto, Livorno, Valle Biaia. 

 Isocardia- and To pes -hanks, Christiania fiord. 



Remarks. — This species has l)een taken as the type form of the genus TurhoiiiUa, 

 which includes shells with an elongated spire, longitudinally costated, without or 

 with only microscopical sj^iral sculpture and wanting the characteristic tooth of 

 Odostomia, or having merely a minute or nearly obsolete fold. 



