624 PLIOCENE MOLLUSCA. 



Manzonia costata (Adams). Plate L, fig. 48. 



1796. Turbo costatus, Adams, Trans. Linn. Soc, vol. iii, p. 65, pi. xiii, figs. 13, 14. 



1803. Turho costatus, Montagu, Test. Brit., vol. ii, p. 311, pi. x, fig, 6. 



1836 — 44. Bissoa carinata, Pliilippi (not Da Costa), Euiim. Moll. Sic, vol. i, p. 150, pi. x, fig. 10, 



1836 ; R. exigua, vol. ii, p. 125, 1844. 

 1853. Bissoa costata, Forbes and Hanley, Brit. Moll., vol. iii, p. 92, pi. Ixxviii, figs. 6, 7. 

 1859. Bissoa exigua and B. carinata, Chenu, Man. Conch., vol. i, p. 307, figs. 2178, 2179. 

 1859. Bissoa costata, G. B. Sowerby, 111. Ind. Brit. Shells, pi. xiii, fig. 14. 

 1867—84. Bissoa costata, Jeffreys, Brit. Conch., vol. iv, p. 22, 1867; vol. v, p. 207, pi. Ixvii, fig. 2, 



1869 ; Proc. Zool. Soc, p. 116, 1884. 

 1874 — 76. Bissoa (Alvania) costata, Seguenza, Boll. E. Com. Geol. Ital., vol. v, p. 4, no. 393, 1874; 



vol. vii, p. 102, no. 684, 1876. 

 1878. Onoba costata, G. O. Sars, Moll. Eeg. Arct. Norv., p. 359. 

 1878 — 84. Bissoa^ (Alvania) costata, Monterosato, Enum. e Sinon. Conch. Medit. (Griorn. Soc Sci. 



Nat. Palermo, vol. xiii, p. 85), 1878 ; Manzonia costata, Nom. Gen. e Spec Conch. Medit., p. 64, 



1884. 

 1884. Bissoa (Manzonia) costata, Bucquoy, Dautzenberg ct Dollfus, Moll. mar. Rouss., vol. i, p. 300, 



pi. xxxvi, figs. 20 — 22. 

 1890. Bissoa (Manzonia) costata. Cams, Prod. Faun. Medit., vol. ii, ]). 326. 

 1892. Alvania costata, Loeard, Coq. mar. Cotes de Prance, p. 164, fig. 139. 

 1892. Bissoa costata, A. Bell, Eep. Yorks. Phil. Soc, p. 63. 



1901. Manzonia costata. Couch. Soc. List, Jouru. of Conch., vol. x, p. 18, no. 345. 

 19U7. Bissoia (Manzonia) costata, Scalia, Att. Accad. Gioen. Sci. Nat. Catania [4], vol. xx, p. 33, 



no. 238. 



1913. Bissoa (Manzonia) costata, Dautzenberg et Durouchoux, Feuille des Jeuues Natur., vol. xliv, 

 p. 30, pi. ii, fig. 16. 



1914. Bissoia (Manzonia) costata, Cerulli-Irelli, Palaeout. Ital., vol. xx, p. 193, \A. xv, figs. 43 — 47. 



S'pecific Characters. — Shell very small, ol)loiig, slender, solid, obliquely twisted ; 

 whorls 6, compressed, the first minute and rounded, the last the largest, three-fifths 

 of the total length ; spire long and pointed ; suture deep ; ornamented by strong, 

 prominent and flexuous longitudinal ribs which do not quite reach the base, being 

 cut off by a well-marked spiral ridge starting from the top of the mouth, followed 

 closely by a deep spiral groove or depression ; the shell is also covered by extremely 

 delicate transverse lines, hardly visible without the aid of a lens ; mouth oval, with 

 a wide, strong and continuous margin ; outer lip thickened by the labial rib, finely 

 grooved inside. 



Dimensions. — L. 3 mm. B. 1'5 mm. 



Dbstrihution. — .Recent : British coasts from the English Channel to the Shetland 

 islands, not common. North Atlantic, as far south as Madeira and the Canaries. 

 Christiania fiord (G. 0. Sars). 



Fossil : Bridlington, Gloppa. Selsey. Irish estuarine clays. 

 Scotland — Garvel Park. 



Upper Pliocene : Monte Mario, Altavilla. 



