188 LIMN.EADJE. 



The animal is of a rather pale grey hue, with darker 

 specklings about the head ; its tentacles are obtuse and 

 triangular ; its foot is ovate-oblong-. 



This little mollusk is abundant on stones in running 

 brooks, clear streams, and rivers throughout the British 

 Islands. Occasionally it is found adhering to plants, and 

 here and there is taken in pools and ponds, but almost 

 always where there is or has been running water flowing- 

 through. 



There is no question as to this shell being the Patella 

 lacustris of Linnaeus ; but, since the majority of concholo- 

 gical writers have applied that name to the next species, 

 and since the designation lacustris is peculiarly inapplicable 

 to this, we have retained the appropriate appellation given 

 to it by Mtiller, and by which it is usually known. 



A. oblongus, Lightfoot. 

 Elongated oblong : apex near the middle, directed to the left. 



Plate CXXII. fig. 5. 



Ancylus lacustris, Muller, Verm. Hist. pt. 2, p. 199.— Fleming, Brit. Animals, 

 p. 280; Treatise Moll. Anim. pi. 7, f. 19. — Jeffreys, Trans. 

 Linn. Soe. vol. xvi. p. 391. — Tirt. Manual L. and F. W. 

 Shells, p. 141, f. 126.— Thomps. Ann. Nat. Hist. vol. vi. 

 p. 121. — Brown, lllust. Conch. G. B. p. 60, pi. 12, f. 3, 5, 

 7.— Dr.vi'. Moll. Ter. et Fluv. France, p. 47, pi. 2, f. 25, 27. 

 — Voith in Sturm Deutsch. Fauna, sect. 6, pt. 4, pi. 8. — 

 C. Pfeif. Deutsch. Land und S'ussw. Moll. pt. 1, p. 109, 

 pi. 4, f. 46.— Nils. Moll. Suec. Ter. et Fluv. p. 83.— Schub. 

 and WAGN. Conch. Cab. vol. xii. p. 163, pi. 235, f. 4108.— 

 Kickx, Moll. Brabant, p. 78. — Sowerby, Genera Shells, 



Anc. f. 2. — Desm. Bull. Linn. Bordeaux, vol. vii. pi. 1, b 



(Iras, Moll. Ter. et Fluv. France, p. 65, pi. 5, f. 9.— Reeve, 

 Conch. Syst. vol. ii. pi. 193, f. 2. — Mermet, Moll. Pyren. 

 p. 71. — Dupuy, Moll. Gers, p. 61. — Stein, Schnecken 

 Berlins, pi. 3, f. 8. 



Patella oLlonga, Lightfoot, Phil. Trans. 1786, vol. lxxvi. p. 168, pi. 3, lower 



