PLANORBIS 87 



1813. Helix contorfa : Rackett, in Pulteney, Cat. Dorset., 



ed. 2, p. 53, pi. XX, f. 11. 

 1817. Helix contorta, Linn. : Dillwyn, Cat. Shells, ii, p. 908. 

 1821. Planorhis contortus. Mull. : C. Pfeiffer, Natimj. Deutsch. 



MoH., i, p. 81, pi. iv, f. 11. 

 1823. Helix contorta : [Brown], Ency. Brit., ed. 6, vi, p. 'ISS. 

 1827. Planorhis contortus, Lam. : Brown, Illust. Conch. Brit., 



ed. 1, pi. xli, f. 33 & 34. 



1830. Planorhis contortus, Linn. : Jeffreys, Trans. Linn. 



Soc, xvi, p. 382. 



1831 . Planorhis contortus, Drap. : Turton, Manual, p. 113, f. 9G. 

 1837. Planorhis (Bathyomphalus) contortus, Drap. : Charpen- 



TiER, Neue Denkschr, Allg. Schweiz. Gesell., i 



[no. 2], p. 20. 

 1840,] Planorhis contortus, Miiller : Gray, in Turton's Mamial, 

 Apr. j new ed., p. 270, pi. viii, f. 96. 



Post \ pifinorhis contrortus [sic], Muller : Brown, Illust. Conch. 



^^P^- 1 Brit., ed. 2, p. 33, pi. xiv, f. 33 & 34. 



Io40. J 



1845. Planorhis contrortus [sic], Muller : Brown, Illust. L. & 



F.-W. Conch. Brit., p. 24, pi. iii, f. 24 & 25. 

 1847. Coretus {Polygyrus) contortus : Gray, Proc. Zool. Soc. 



Lond., 1847, p. 181. 

 1850. Planorhis (Discoidina) contortus : Stein, Lebend. Schneck. 



& Musch. Berlins, p. 82. 

 1852. Planorhis contortus, Linnseus : Forbes & Hanley, Brit. 



Moll, iv, p. 160, pi. cxxvi, f. 3. 



1855. Planorhis (Spirorhis) contortus, Linn. : H. & A. Adams, 



Genera Moll, ii, p. 263. 



1856. Planorhis {Bathyomphalus) contortus, Linn. : Moquin- 



Tandon, Hist. Moll. France, ii, p. 443, 

 pi. xxxi, f. 24-31. 



1857. Planorhis {Bathyomphalus) contortus, Linn. : Gray, in 



Turton's Manual, new ed., p. 244, pi. viii, f . 96. 



1862. Planorhis contortus, Linne : Jeffreys, Brit. Conch., i, 



p. 94; V, pi. vi, f. 4. 



1863. Planorhis contortus, Linnteus : Reeve, L. & F.-W. Moll. 



Brit. Is., p. 146, figs. 



[Germain {Moll France, ii, p. 256) gives Planorhis Rayi, 



Bourg. as a synonym.] 

 First recorded as British about 1702-11, by J. Petiver 



{Gazophil, pi. xcii, f. 8). 

 British Distribution in Time : Cromerian to Recent. 



15. Planorbis (Hippeutis) complanatus (Linne). 

 Etym. : — Lat. complanatus, made level. 



1758. Helix complanata : Linnaeus, Syst. Nat., ed. 10, p. 769, 

 uo. 579. 



