248 PLIOCENE MOLLUSCA. 



Distribution. — Recent : Mediterranean, ^gean. 



Fossil : Waltonian Crag : Little Oakley. 



liemarl-s. — The unworn but imperfect fossil here given as M. alhida corresponds 

 very nearly with the Recent shell figured by Prof. Kobelt under this name, and may 

 be referred provisionally, I think, to it. Our specimen appears to be distinct from 

 anything else known to me from the Crag and deserves notice. I hope a more 

 complete example may turn up hereafter. Dr. Bucquoy and his colleagues group 

 a number of allied forms as varieties of the present species. 



Mangilia Smithii (Forbes). Plate XXIX, figs. 21, 22. 



1840. Pleiirotoma Smithii, Forbes, Aim. Mag. Nat. Hist., vol. v, p. 107, pi. ii, fig. 14. 



1846. Phurotoma striolata. Reeve, Conch. Icon., vol. i (Pleurotoma), pi. xxxv, fig. 320. 



1853. MangelUi striolata, Forbes and Hanlej, Brit. Moll., vol. iii, p. 483, pi. cxiv a, figs. 1, 2. 



1867. Pleurotoma striolata, Jeffreys, Brit. Couch., vol. iv, p 376, pi. xc, fig. 1. 



1871. Pleurotoma striolata, Jeffreys, Quart. Joiirn. Geol. Soc, vol. xxvii, p. 490. 



1873. Mangelia striolata, Seguenza, Boll. E. Com. Geol. Italia, vol. iv, p. 298, no. 113. 



1890. Baphitoma costulatum, var. striolata, Carus, Prod. Faun. Medit., vol. ii, p. 422. 



1905. Bapliitoma (Smithiella) costulatum striolatiim, Kobelt, Icon, schalentrag. eiirop. Mcerescoucb., 



vol. iii, p. 383, pi. xcvii, fig. 20. 



Specific Characters. — Shell fusiform, slender, rather solid ; spire turreted, 

 elongate, regularly tapering ; whorls 7, but slightly convex, squarely shouldered 

 above, the last more than half the total length ; ornamented by nine or ten prominent 

 longitudinal costas, and by excessively fine spiral lines, only visible by the aid of a 

 lens ; suture deep ; mouth narrow, contracted above, showing clearly a small and 

 shallow labial notch ; outer lip slightly thickened outside by the labial rib, not 

 expanded ; columella flexuous. 



Dimensions. — L. 10 — 12 mm. B. 4 n)m. 



Distritmtion. — Recent : British seas, western and southern. Western coasts of 

 France, Spain and Portugal. Mediterranean, Adriatic, Madeira, Canary Isles. 



Fossil: Waltonian Crag: Walton-on-Naze, Little Oakley, Beau- 

 mont. Newbournian : Sutton (Jeffreys). 



Pleistocene : Monte Pellegrino, Catania, Gravina, Reggio, Valle Biaia. 



Bemarks. — The Recent British and Mediterranean species generally known as 

 Pleurotoma, Ua'phltoma or Mangelia striolata, which, for the reasons given below, 

 I am describing under Forbes' varietal name of Smithii, seems to have been a rather 

 rare denizen of the Crag sea. I have met with several specimens of it at Oakley, 

 and Jeffreys reported it from the Red Crag of Sutton. Seguenza gives Mangelia 

 !<triolata, Scacchi, from various localities of the Italian and Sicilian Pleistocene, 

 and this may possibly be the same as the present form, Avhich otherwise has not 

 been recognized from the Pliocene of the south of Europe. 



