148 LITTORINID^. 



Eidima decussata, Brit. Marine Conch, p. 187. — Macgil. Moll. Aberd. p. 343 ? 

 Rlssoa pyramidiUa, Brown, Illust. Conch. G. B. p. 11, pi. 9, f. 63. 



A common W. Indian shell ; introduced hy Montagu as taken 

 on the Dorset coast hy Mr. Bryer. Its solid and j)orcelain white 

 structwe, its flattened surface, the suhlohated basal advance of the 

 outer Up, and the effuse or suhcanalicidated anterior extremity of 

 the aperture below the 2^illc(i'', render it very unlike our native 

 RissoaB. We have never seen any examples in which the apex was 

 not truncated. 



R. AURiscALPiuM, Liiinseus. 



Ttirbo aurhcalpium, Linn. Syst. Nat. ed. 12, p. 1240. 

 Turritella „ Bosc, Hist. Nat. Coquilles, vol. iv. p, 82. 



Turbo marginatus, Mont. Test. Brit. Suppl. p. 128. — Laskey, Mem. Werner. 

 See. vol. i. pi. 8, f. 13.— TuRT. Conch. Diction, p. 213.— 

 Wood, Index Testaceolog. pi. 31, f. 105. 

 „ arcuatus, Dillw. Recent Shells, vol. ii. p. 8.59. 

 Jiissoa acicula, Risso, Hist. Nat. I'Europe Merid. vol. iv, p. 121, f. 60 ? — 

 SovvERBY, Genera Shells, Riss. f. 4 ; from which. Reeve, 

 Conch. System, pi. 208, f. 4 ? 

 „ acii/a, Desmar. Nouv. Bullet. Soc. Philomat. Paris, 1814, p. 8, pi. J, 

 f. 4. — Blainv. Man. Malac. p\. 35, f. 6 (badly). — Desh. Encycl. 

 Meth. vol. iii. p. 889 ; Lam. Anim. s. Vert. vol. viii. p. 470. 

 — Philippi, Moll. Sicil. vol. i. p. 151. — Payraudeau, Cat. 

 Moll. Corse, p. 110. — Potiez and Mich. Gal. Douai, Moll, 

 vol. i. p, 266. 

 Cingula maryinata, Fleming, Brit. Anim. p. 306. — Brit. Marine Conch, p. 176. 

 Rissoa auriscalpitun, Menke, Synopsis Mollusc, (ed. 2), p. 44 (identification 

 only). — Philippi, Moll. Sicil. vol. ii. p. 125. 

 „ marglnata. Brown, Hlust. Conch. G. B. p. 11,13, pi. 9, f. 23, 24, 83. 



A Mediterranean shell : introduced hy 2Iontagu as taken hy 

 Laskey near Dunbar. 



R. cALATHiscus, Montagu. 



Ttirho cimex; Linn. Syst. Nat. ed. 12, p. 1233, from types. 



„ calathiscus, Mont. Test. Brit. Suppl. p. 132 (not van), pi. 30, f. 5. — Turt. 

 Conch. Diction, p. 211. — Dillw. Recent Shells, vol. ii. 

 p. 821.— Wood, Index Test. pi. 30, f. 16. 

 Aivania Europcea and maniilkUa, Risso, Hist. Nat. Europe, Mer. vol. iv. f. 116, 



128. 



