ALVANIA PUNCTURA. 615 



Remarlis. — The unique specimen figured under the above name belongs to the 

 Warburton Collection at the British IMuseum of Natural History, and was described 

 bj Messrs. Etheridge and Bell as a new species. It belongs to the type before 

 mentioned in which the longitudinal costaj are cut off by conspicuous spiral ridges, 

 continuous to the base, with generally a distinct transverse line at the suture. 



Alvania punctura (Montagu). Plate LI, fig. 32. 



1803. Turbo pnnclura, Montagu, Test. Brit., pt. ii, p. 320, pi. xii, fig. 5. 



1853. Ritfsoa Jill net urn, Forbes aud Hanley, Brit. Condi., vol. iii, p. 89, pi. Ixx.x, figs. 8, 9. 



1859. Rissoa punctura, G. B. Sowerby, 111. Iiul. Brit. Shells, pi. xiii, fig. 13. 



1867 — 69. Rissoa punctura, Jeffreys, Brit. Conch., vol. iv, p. 17, 1867; vol. v, p. 207, pi. Ixvi, fig. 8, 



1869. 

 1870 — 90. Rissoa punctura, A. Bell, Journ. de Couch., vol. xviii, p. 352, no. 394, 1870; Proc. Roy. 



Soc. Edin., vol. x, p. 296, 1890. 

 1873. Rissoa (Alvania) punctura, Weiakauff, Cat. europ. Meerescouch., vol. ii, p. 19, no. 308. 

 1874 — '?&. Rissoa (Alvania) punctura, Seguenza, Boll. R. Com. Geol. Ital., vol. v, 'p. 4, uo. 384; 



p. 282, uo. 134, 1874; vol. vii, p. 102, uo. 679, 1876. 

 1890. Rissoa punctura , Carus, Prod. Faun. Medit., vol. ii, p. 330. 

 1892. Alvania puncturata, Locird, Coq. mar. Cotes de France, p. 162. 



1898. Rissoa. (Alvania) punctura, Biicquoy, Dautzeuberg et Dollfus, Moll. mar. Rouss., vol. ii, p. 797. 

 1901. Alvania punchir a, Conch. Soc. List, Jouru. of Couchology, vol. x, p. 18, no. 341. 

 1913. Rissoa (Alvania) jninchira, Dautzeuberg et Durouchoux, Feuille des Jeuues Natur., vol. xliv, 



p. 30. 



Specific Characters. — Shell minute, ovato-conical ; whorls G, convex and ronnded, 

 the last about three-fifths the total length; ornamented by numerous fine longi- 

 tudinal and transverse thread-like strijB or ril)s, forming delicate and closely-set 

 cancellation ; the longitudinal ribs do not, however, reach the base ; in worn 

 specimens the surface appears to be indented with a series of delicate punctures ; 

 suture deep, but not excavated ; mouth oval, rounded, but little expanded ; outer 

 lip thin, with a thickened labial rib ; inner lip reflected on the pillar. 



Dimensions. — L. 2 mm. B. 1 nnn. 



JJistribnfion. — liecerit : Widely distributed in British seas from Guernsey to 

 Unst. Norwegian coast from the Christiania fiord to Finmark and the Lofoten 

 Islands. Brittany, Provence, Canary Islands, Mediterranean, Adriatic, ^^^gean. 



Fossil: Coralline Crag: Sutton. Waltonian : Walton-on-Naze. 

 Selsey, Shewalton. Irish estuarine clays. Holocene : Portrush. 



Pliocene : Biot. 



Pleistocene : Sicily — Monte Pellegrino, Ficarazzi, Messina. Calabria — Reggio, 

 Taranto. Tuscany — Livorno, Valle Biaia. Uddevalla. Christiania fiord — Tapes- 

 banks. 



liemarlcs. — This well-known British shell, widely distributed according to 



