ANCTLUS. 187 



p. 58, pi. 22, f. 8.— Tiirt. Conch. Diction, p. 138. — DiLLW. 

 Recent Shells, vol. ii. p. 1041.— Woo n, [ndex Tostiic.pl. 37, 

 f. 56. 



Ancylusfluviatilis, Muller, Verm. Hist. pt. 2, p. 201. — Fleming, Brit. Anim. 

 p. 280. — Jeffreys, Trans. Linn. Soc. vol. xvi. p. 390. — 

 Turt. Manual L. and F. W. Shells, p. 140, f. 125; ed. 

 Gray, p. 249, f. 125. — Thomps. Ann. Nat. Hist. vol. vi. 

 p. 121. — Macgilliv. Moll. Aberd. p. 121. — Brown, Illust. 

 Conch. G. B. p. 59, pi. 12, f. 1,4, 6.— Drap. Moll. Ter. et 

 Fluv. France, p. 48, pi. 2, f. 23, 24. — Voith in Sturm 

 Deutsch. Fauna, sect. 6, pt. 4, pi. 9. — C. Pfeif. Deutsch. 

 Land und Sussw. Moll. pt. 1, p. 107, pi. 4, f. 44, 45, and 

 pi. 1, f. 16, animal.— Nils. Moll. Suec. Ter. et Fluv. p. 84. 

 — Schub. and Wagn. Conch. Cab. vol. xii. p. 162, pi. 235, 

 f. 4107. — Kickx, Moll. Brabant, p. 77. — Sowerby, Genera 

 Shells, Anc. f. 1. — Philippi, Moll. Sicil. vol. i. p. 120; 

 vol. ii. p. 93. — Gras, Moll. Ter. et Fluv. France, p. 65, 

 pi. 5, f. 10. — Reeve, Conch. Syst. vol. ii. pi. 193, f. 1. — 

 Mermet, Moll. Pyren. p. 71. — Dupuy, Moll. Gers, p. 61. 

 — Stein, Schnecken Berlins, pi. 3, f. 7. 



Patella „ Da Costa, Brit. Conch, p. 1, pi. 2, f. 8. — Mont. Test. Brit 

 p. 482. 



Ancilus „ Brard, Coq. Envir. Paris, p. 200, pi. 7, f. 3. 



„ sinuosus, Brard, Coq. Envir. Paris, p. 201, pi. 7, f. 4. 



Ancylus „ Gras, Moll. Ter. et Fluv. France, pi. 5, f. 8. 



Shell of a curved conical shape, more or less elevated, 

 the height sometimes but little inferior to the breadth, very 

 thin, and under its olivaceous epidermis bluish white both 

 within and without, most minutely radiated externally with 

 extremely fine and densely disposed slightly raised wrinkles, 

 which are usually rather more evident in front. Sides not 

 compressed, almost equal and similar ; extremities well 

 rounded and almost equal, the front being only slightly the 

 broader. Apex lying far back, rather acutely peaked 

 and hooked ; the slope from thence forwards greatly arcu- 

 ated, the hinder declination more or less abruptly and 

 much incurved. Margin acute ; side edges decidedly, 

 though rather unequally, curved. Base simple, not in- 

 dented. Length a quarter of an inch, breadth nearly two 

 lines and a half. 



