436 PLIOCENE MOLLUSCA. 



have figured on the chance of its turning up in the East Anglian Crag. It may be 

 easily recognised by its short, obtusely conical spire and the fine or nearly obsolete 

 denticulation of the keel. 



Aporrhais Serresianus (Michaud). Plate XLI, fig. 33. 



1828. Rostellaria serresiana, Michaud, Bull. Soc. Linn. Bordeaux, vol. ii, p. 120, pi. i, figs. 3, 4. 



1844. Chenopus Serresianus, Philippi, Euum. Moll. Sic, vol. ii, p. 185, pi. xxvi, fig. 6. 



1873-6. Chenopus Serresianus, Seguenza, Boll. E. Com. Geol. Ital., vol. iv, p. 350, no. 232, 1873 ; 



vol. v, p. 280, uo. 91, 1874; vol. vii, p. 8, uo. 434, 1876. 

 1874. Aporrhais pes-pelicani, var. Serresianus, S. V. Wood, Mon. Crag Moll., 1st Suppl., pt. ii, 



p. 180, add. pi., fig. 6. 

 1878. Aporrhais Serresianus, G. O. Sars, Moll. Beg. arct. Norv., pp. 192, 359, pi. xiii, fig. 4; pi. xxii, 



fig. 7. 

 1884. Aporrhais Serresianus, Bucquoy, Dautzenberg et Dollfus, Moll. mar. Eouss., vol. i, p. 220, 



pi. xxiii, figs. 9, 10. 

 1890. Chenopus Serresianus, Carus, Prod. Fauu. Medit., vol. ii, p. 367. 

 1892. Aporrhais Serresianus, Locard, Coq. mar. Cotes de France, p. 124. 

 1898. Aporrhais Serresianus, Posselt, Medd. om Gr^nl., p. 214. 

 1901-3. Aporrhais serresianus, Friele og Grieg, Norske Nordh. Exped. (Mollusca), pt. iii, p. 79. 



1907. Chenopus serresianus, Scalia, Atti Accad. Gioen. Sci. Nat. Catania, vol. xx, p. 34, uo. 280. 



1908. Aporrhais serreseanus, Kobelt, Icon, schaleutrag. europ. Meerescouch., vol. iv, p. 20, pi. civ, 

 figs. 1 — 4. 



1911. Aporrhais serresianus, Marshall, Journ. of Conch., vol. xiii, p. 183. 



1913. Chenopus serresianus, Gignoux. Auu. Uuiv. Lyou, u.s. [1], vol. xxxvi, p. 542. 



Specific Characters. — Shell resembling that of A. pes-pelicani but thinner and 

 more delicate, the spire being shorter and more slender; whorls 9 to 10, convex, 

 regularly diminishing in size upwards, the last drawn out into a long, very fine 

 and narrow spine-like process or finger which is curved towards the end; the 

 upper finger projects beyond the spire, and is closely attached to it; angulation 

 of the whorls much less prominent, the tuberculate ornaments being smaller 

 and more numerous, especially on the last whorl; suture distinct but not so 

 deep as in A. pes-pelicani. 



Dimensions. — L. 45 mm. B. (without the wings) 12 mm. 



Distribution. — Recent : W. and S.W. of Ireland, Shetlands, Shetland-Faroe 

 Channel, Lerwick, Butt of Lewis, Valentia, North Sea, English Channel. 

 Atlantic coasts of Spain, France and Norway to Lofoten Islands. Mediterranean, 

 Adriatic, vEgean. Greenland, Davis Strait. 



Fossil : Coralline Crag : Gomer, Broom Hill. 



Lower Pliocene : Italy. 



Upper Pliocene : Italy, Sicily. 



Pleistocene : Sicily — Ficarazzi, Barcellona-Castroreale. 



Remarks. — This distinct form, which seems to be less abundant, whether as 



