244 PLIOCENE MOLLUSCA. 



line tliread-liko lines in the interspaces, becoming more distinct and cnrving- to the 

 left at the sutnre, Avith a nnmber of raised nneqnal spiral ridges which cross the 

 ribs ; sntnre deep and channelled ; month oval, passing into a narrow canal ; onter 

 lip thin. 



Dimensloiu. — L. 25 mm. B. 10 nnn. 



Distribution. — Not known livino-. 



Fossil : Waltonian Crag : Little Oakley. 



Upper Pliocene : Biot, Monte Mario, Colle Astesi, Valle Andona, Bologna, 

 Altavilla. 



Pleistocene : Ficarazzi, Monte Pellegrino. 



Remarks. — The fragmentary and probably immatnre fossil from Oakley described 

 provisionally nnder the above name is different from anything I have met with 

 elsewhere in the Crag. As far as it goes, it agrees Avith a specimen of B. stria from 

 the Pleistocene deposits of Monte Pellegrino, near Palermo, that the Marchese di 

 Monterosato has kindly sent me, Avhich I figure with it as a guide to future 

 collectors. It is a fragile shell and can hardly be derivative in the Oakley Crag. 



Genus MANGILIA, Risso, 1826. 



Mangilia costata (Donovan). Plate XXIX, fig. 13. 



1803. Murex costatns, Douovan, Nat. Hiftt. Brit. Shells, vol. iii, p. 91. 



1848. Clavahda costata, S. V. Wood, Mou. Crag Moll., pt. i, p. 58, pi. vii, fig. 6. 



1853. Mamjelia costata, Forbes and Hanley, Brit. Moll., vol. iii, p. 485, pi. cxiv a, figs. 3, 4. 



1867. Pleurotoma costata, Jeffreys, Biit. Conch., vol. iv, p. S379, pi. xc, tig. 3. 



1873-5. Mamjelia costata, Segueuza, Boll. K. Com. Geol. Italia, vol. iv, p. 298, no. 110, 1873 ; Raphi- 



toma costata, vol. vi, p. 210, no. 226, 1875. 

 1890. Mancjilia costata, Carus, Prod. Faun. Medit., vol. ii, p. 418. 

 1905. Mangilia costata, Kobelt, Icon, schalentrag. europ. Meeresconch., vol. iii, p. 343, pi. xciv, 



figs. 18—20. 

 1910. Mangilia, costata, CeruUi-Irelli, Palaeont. Ital., vol. xvi, p. 54, pi. v, fig. 10. 

 1912. Pleurotoma costata, Tesch, Med. v. d. Eijks. v. Delfstoffen, pt. iv, p. 88, no. 224. 

 1914. Mangilia costata, Cipolla, Palaeont. Ital., vol. sx, p. 141, pi. xiii, figs. 9, 10. 



Specific Cliaracters. — See S. V. Wood, Mon. Crag Moll., pt. i, p. 58. 



Dimendons. — L. 8 mm. B. 3 mm. 



Distribution. — Recent: British Seas, generally distributed. West European, 

 Marseilles, Sicily. 



Fossil : Coralline Crag : Sutton, Boyton. Waltonian : Walton- 

 on-Naze, Beaumont, Little Oakley. Newbournian : Foxhall, Waldringfield, New- 

 bourn. Sutton, Felixstowe, Shottisham. Butleyan : Butley, Alderton. Wexford. 



