CYCLAS. 113 



form ; the mantle white, the labial palps long, triangular, 

 and strongly striated. It is sluggish in its habits. 



The most prolific locality is the River Thames ; it is 

 found likewise in the New River (Baily) ; the Trent 

 (Jenyns) ; the Lea (S. H ) ; the canals about Leamington, 

 in Warwickshire (Thompson) ; streams in Yorkshire 

 (Bean). In a pond at Enville, Staffordshire, a young 

 specimen (Jeffreys). It has not been taken either in Scot- 

 land or Ireland. On the Continent it occurs in Germany, 

 France, and Belgium ; and as a fossil, is found in the Pleis- 

 tocene freshwater beds of the south of England. 



C. cornea, Linnaeus. 



Suborbicular, almost smooth ; umbones obtuse ; ligament 

 inconspicuous. 



Plate XXXVII. fig. 3, 4, 5, G. 



Tellina cornea, Linn. Syst. Nat. ed. 12, p. 1120 ; Fauna Suecica, ed. 2, p. .517. 

 — Pennant, Brit. Zool. ed. 4, p. 89, pi. 49, f. 3G. — Linn. 

 Trans, vol. viii. p. 59. — Donov. Brit. Shells, vol. iii. pi. 96. — 

 Turt. Conch. Diction, p. 179. — Schroter, Flussconchylien, 

 p. 189 (partly), pi. 4, f. 4. — Dillw. Recent Shells, vol. i. 

 p. 104 (chiefly). 

 „ rivalis, Muller, Verm. Terr, et Fluv. vol. ii. p. 202. 

 Cardium corneum, Pulteney, Hutchins, Hist. Dorset, p. 31. — Mont. Test. 



Brit. p. 8 G.— Dorset Catalog, p. 32. 

 Cyclas rivalis, Draparn. Moll. Terr, et Fluv. France, p. 129, pi. 10, f. 4, 5 

 (not well).— Brard, Coq. T. et Fl. Paris, p. 222, pi. 8, f. 4, 5 

 (badly). 

 „ cornea, Lam. Anim. s. Vert. (ed. Desh.) vol. vi. p. 268 (not vara.). — 

 Turt. Dithyra Brit. p. 248, pi. 1 1, f. 14.— Flem. Brit. Anim. 

 p. 452.— Turt. Manual. L. and F. W. Shells, p. 13, pi. 1, f. 

 2. — Jenyns, Trans. Cambridge Phil. Soc. vol. iv. p. 295. — 

 Gray, Manual L. and F. W. Shells, p. 280, pi. 1, f. 2.— 

 Brown, Illust. Conch. G. B. p. 93, pi. 39, f. 19. — I'feikfer, 

 Deutsch. Laud und Siissw. Moll. pt. 1, p. 120, pi. 5, f. 1, 2.— 

 Nilsson, Moll. T. et Fl. Sueciae, p. 96.— Kickx, Moll. Bra- 

 bant, p. 87. — Philippi, Moll. Sicil. vol. ii. p. 30. — Gras, 

 Moll. T. et Fl. de la France, p. 72, pi. 6, f. 2.— Hanlky, Re- 

 cent Shells, vol. i. p. 89, Suppl. pi. 9, f. 15. 



VOL. II. Q 



