NERITINA. 



N. FLuviATiLis, Linnaeus. 



Plate LXXI, fig. 1, 2 and (Animal) Plate H. H. fig. 1. 



Petiver, Gazopli. pi. 91, f. 3. — Lister, Hist. Conch, pi. 141, 

 f. 38 (badly). 

 Nerita Jluviatilis, LiNN. Syst. Nat. ed. 12, p. 1253. — Pennant, Brit. Zool. ed. 4, 

 vol. iv, p. 141, pi. 88, f. 142.— Da Costa, Brit. Conch, p. 48, 

 pi. 3, f. 8. — Pulteney, Hutchins, Hist. Dorset, p. 50. — 

 DoNov. Brit. Shells, vol. i, pi. 16, f, 2.— Mont. Test. Brit, 

 p. 470. — Maton and Rack. Trans. Linn. Soc. vol. viii. 

 p. 225. — Dorset Catalog, p. 57, pi. 16, f. 17, 18. — Turt. 

 Conch. Diet. p. 127. — Muller, Hist. Verm. pt. 2, p. 194. 

 — Draparn. Moll. Ter. et Fluv. France, p. 31, pi. 1, f. 1 to 

 14. — Brard, Coq. Paris, p. 194, pi. 7, f. 9, 10, 12. — C. 

 Pfeif. Deutsch. Land und Siissw. Moll. p. 106, pi. 4, f. 37, 

 38, 39, and pi. 1, f. 15 (animal). — Dillwyn, Recent Shells, 

 vol. ii. p. 998 (not var.). — Wood, Index Testaceolog. pi. 35, 

 f. 26.— KiCKX, Moll. Brabant. Austral, p. 76. 

 Theodoaus Lutetianus, Montfort, Syst. Conch, vol. ii. p. 351. 

 Neritina Jluviatilis, Lam. Anim. s. Vert. (ed. Desh.) vol. viii, p. 576. — Turt. 

 Manual L. and F. W. Shells, p. 138, f. 124.— Fleming, 

 Brit. Animals, p. 321. — Gray, Manual L. and F. W- 

 Shells, p. 83, pi. 8, f. 124.— Macgilliv. Moll. Aberdeen. 

 p. 129. — Brown, Illust. Conch. G. B. p. 26, pi. 18, f. 1, 

 2, 3 ; pi. 13, f. 4, 5. — Gras, Moll. Ter. et Fl. France, 

 p. 69, pi. 5, f. 19. — RossM. Icon. L. und Siissw. Moll, 

 pt. 2, pi. 7, f. 118, 119.— SowERBY, Thes. Conch, vol. ii. 

 p. 514, pi. 115, f. 178, 179, 180, 182, 185, 186. 

 „ fontinalis, Brard, Coq. Paris, p. 196, pi. 7, f. 11. 

 „ Dalmatica, Sowerby, Conch. 111. Nerit. f.57. 



This shell is transversely sub-oval, rounded above, flat- 

 tened, and in the middle incurved lengthways, underneath, 

 and obliquely produced in front towards the outer lip. It 

 is not particularly glossy, is thin, smooth to the eye, yet 

 under the lens closely and distinctly wrinkled in a lon- 

 gitudinal direction. The disposition of the colouring is 

 variable, but in most of our native examples, the ground, 

 which ranges in tint from purplish-black to madder-red, 

 is variegated with small elongated spots, that are broader 

 than long, of yellowish white ; sometimes these are few 



