VALVATA. 19 



V. pisciNALis, Miiller. 

 Spire manifestly raised above the last volution, 



Plate LXXI.fig. 9, 10. 



Neritu piscinalis, Muller, Hist. Verm. pt. 2, p. 172. 

 Helix „ Gmelin, Syst. Nat. p. 3G27 (from last). 



Turbo fojitinaiis, Pulteney, Hutchins, Hist. Dorset, p. 45, — Mont. Test. Brit, 

 p. 348, pi, 22, f. 4, — Maton and Rack. Trans, Linn. Soc. 

 vol. viii. p. 168. — Dorset Catalog, p. 50, pi. 18, f, 3, 4, — 

 TuRT. Conch. Diction, p. 207. — Wood, Index Testaceolog. 

 pi, 3],f. 87. 

 Cydosloma ohttisum, Drap. Moll. Ter. et Fluv. France, p. 33, pi. 1, f. 14. 

 Valvata obttisa, Brard, Coq, Paris, p. 190, pi. 6, f. 17. — Turt, Manual L. and 

 F. W. Shells, p. 130, f. 114.— C. Pfeif. Deutsch. Land und 

 Sussw. Moll, pt. 1, p. 198, pi. 4, f. 32, and pi. 1, f, 13 

 (animal). — Kickx, Moll. Brabant, p. 70. 

 Turbo thermalis, Dillw. Recent Shells, vol. ii. p. 852. 



Valvata piscinalis. Lam. Anim. s. Vert. (ed. Desh.) vol. viii. p. 504. — Fleming, 

 Brit, Animals, p. 28(i. — Kenyon, Mag. Nat. Hist. vol. i. 

 p. 425, fig. b. c. d. — Alder, Mag. Zool. and Bot. vol. ii. 

 p. 117. — Gray, Manual L. and F. W. Shells, p. 97, 

 pi. 10, f. 114. — Thompson, Ann. Nat. Hist. vol. vi. p. 17. 

 — Brown, lUust. Conch. G. B. p. 27, pi, 14, f. 62 to 65. 

 — Blainv. Faune Franq. Moll. pi. 12, c, f. 6. — Sowerby, 

 Conch. Manual, f, 322. — Philippi, Moll. Sicil. vol. ii. 

 p. 122. — Menke, Zeitschrift Malak. 1845, p. 119.— 

 Gras, Moll. T. et Fl. France, p. 69, pi. 5, f. 17. 

 Valvte piscinale, Chenu, Traite Element, p. 470, f. 558. 



Of this common shell, there are ivro variations in form 

 among our native specimens, which differ strikingly from 

 each other ; in the one, the shape is comparatively long, 

 and the umbilical cavity small in proportion ; in the other, 

 the shape is decidedly broad, the umbilicus large, and 

 the edge of the aperture manifestly recedes anteriorly. 



The general contour is orbicular-trochoid, and the shell 

 is rather thin, a little glossy, somewhat transparent, and 

 of a pale horn-colour^ changing upon the spire into a 

 reddish hue ; the entire exterior is densely wrought with 



