618 PLIOCENE MOLLUSCA. 



1867 — 84. Bist^oa reticulata, Jeffreys, Brit. Couch., vol iv, p. 12, 1867; vol. v, p. 207, pi. Ixvi, fig. 5, 



.1869 ; B. (Alvania) reticulata, Proc. Zool. Soc. London, p. 112, 1884. 

 1874—76. Eissoa (Alvania) reticulata, Seguenza, Boll. R. Com. Geol. Ital., vol. v, p. 4, no. 377; 



p. 282, no. 130, 1874; vol. vii, p. 102, no. 676, 1876. 

 1878 — 84. Rissoa (Alvania) reticulata, Monterosato, Euum. e Sinon. Coucii. Medit. (Giorn. Soc. Sci. 



Nat. Palermo, vol. xiii, p. 24), 1878; Alcania (Acinus) reticulata, Norn. Gen. e Spec. Conch. 



Medit., p. 62, 1884. 

 1884. Rissoa (Alvania) reticulata, Bucquoy, Dautzenberg et DoUfus, Moll. mar. Rouss., vol. i, p. 290, 



pi. xxxvi, figs. 4—6. 

 1886. Bissoa reticulata, Kendall and R. G. Bell, Quart. Journ. Geol. Soc, vol. xlii, p. 211. 

 1890. Bissoa (Alvania) reticulata, Carus, Prod. Faun. Medit., vol. ii, p. 332. 

 1892. Alvania reticulata, Locard, Coq. mar. Cotes de France, p. 160, fig. 137. 

 1892—98. Bissoa reticulata, A. Bell, Rep. Yorks. Phil. Soc, p. 63, 1892 ; Proc. Roy. Irish Acad. [3], 



vol. ii, p. 629, 1893 ; Trans. Roy. Geol. Soc Cornwall, vol. xii, p. 151, 1898. 

 1895. Alvania (Acinus) reticulata, Sacco, Moll. Terr. Terz. Piem., pt. xviii, p. 24, pi. i, figs. 57 — 59. 

 1901. Alvania reticulata. Conch. Soc. List, Journ. of Conch., vol. x, p. 18, no. 339. 

 1901. Alvania reticulata, Br0gger, Norges geol. Under.- ^gelse. No. 31, pp. 588, 660, pi. xix, fig. 3. 

 1907. Bissoa (Alvania) reticulata, Scalia, Att. Accad. Gioeu. Sci. Nat. Catania [4], vol. xx, p. 32, 



no. 229. 



1912. Bissoa reticulata, Tesch, Med. v. d. Rijks. v. Delfstoffen, No. 4, p. 68, no. 153. 



1913. Bissoa (Alvania) reticulata, Dautzenberg et Durouchoux, Feuille des Jeunes Natur., vol. xliv, 

 p. 30, pi. ii, fig. 9. 



1914. Rissoa (Alvania) reticulata, CeruUi-lrelli, Palaeont. Ital., vol. xx, p. 202, pi. xvi, figs. 4 — 9. 



Specific Characters. — Shell minute, oblong, solid; whorls G — 7, but slightly 

 convex, the last much the largest, three-foui'ths the total length ; ornamented 

 by obscure and rather inconspicuous longitudinal ribs, hardly reaching the base 

 of the shell, and by strong conspicuous spiral ridges giving the shell a fine and 

 regularly reticulated appearance, the upper whorls being smooth ; suture slight, 

 narrowly excavated; spire regularly diminishing upwards to a sharp point; mouth 

 ovate, furrowed on the inside of the outer lip ; inner lip reflected on the pillar, 

 with a narrow groove behind it but no umbilicus. 



Dimensions. — L. 3 mm. B. 2 mm. 



Distribution. — Recent : British coasts in 7 — 50 fathoms, generally diffused. 

 North Atlantic from Norway to Gibraltar and the Canaries, Mediterranean, 

 Adriatic, ^gean. 



Fossil: St. Erth, Waltonian Crag : AValton-on-Naze (Kendall). 

 Selsey. 



Pleistocene : Scotland, fairly general. Ireland — Estuarine clays, Belfast. 

 Holocene : Portrush. 



Upper Pliocene: Monte Mario, Val'd'Era. 



Pleistocene : Messina, Reggio, Ficarazzi, Monte Pellegrino, Catania. 



Itemarhs. — This British species was obtained at St. Erth by Mr. A. Bell and 

 has been reported also from that place and from Walton by his brother 

 R. Gr. Bell and Prof. Kendall. The specimen figured and described with some 



