PLANORBIS 75 



1859. Planorhis adelosius : Bourguignat, t. c, p. 518, pi. xix, 

 f. 13-15. {t. c, p. 131, pi. xvi, f. 13-15.1 



1859. Planorbis aclopus : Bourguignat, t. c, p. 521, pi. xx, f. 

 4-6. {t. c, p. 135, pi. xvii, f. 4-6.) 



1862. Planorbis corneus, Linne : Jeffreys, Brit. Conch., i, 



p. 93 ; V, pi. vi, f. 3. 



1863. Planorhis corneus, Linnagus : Reeve, L. & F.-W. Moll. 



Brit. Is., p. 138, figs. 

 1880. Planorhis (Helisoma) clathratus, Sandb. : Sandberger, 

 Palaeontograph., xxvii (N.F. vii), p. 100, pi. 

 xii, f. 8-8c. 



[Germain (Moll. France, ii, p. 251) gives as synonyms : — 

 Planorbis Taciti, Letourueux ; P. helophilus, Bourg. ; 

 and P. Mahillei, Bourg. Por a considerable list of 

 names that have been applied to varieties of this 

 species, See Germain in Rec. Indian Mus., xxi, 1921, 

 pp. 10-12.] 



First recorded as British in 1674, by M. Lister {Phil. 

 Trans., ix, p. 99, pi. ii, f. 23). 



British Distribution in Time : Pliocene to Recent. 



4. Planorbis (Gyraulus) albus, Miiller. 

 Etym. : — Lat. alhns, white. 



1774. Planorbis alhus : Muller, Verm. Hist., ii, p. 164. 

 1791. Helix alba : Gmelin, in Linn. Syst. Nat., ed. 13, i, pt. 6, 

 p. 3625. 



. ' Planorbis villosus : Poiret, Coq. Aisne, p. 95. 



1801,) Planorbis aUrns, Mull. : Draparnaud, Tabl. Moll. France, 



July./ p. 44. 



1801,) Planorbis hispidus, nobis: Vallot, Exer.' Hist. Nat., 



Aug. / p. 5. [Teste Moquin-Tandon.] 



1803. Helix alba, Gmel. : Montagu, Test. Brit., p. 459, pi. xxv, 



f. 7. 

 1805. Planorbis hispidus : Draparnaud, Hist. Moll. France, 



p. 43, pi. i, f. 45-47. 

 1807. Helix alba : Maton & Rackett, Trans. Linn. Soc, viii, 



p. 192. 

 1813. Helix alba : Rackett, in Pulteney, Cat. Dorset., ed. 2, 



p. 53, pi. xix, f. 18. 

 1817. Helix alba, Miill. : Dillwyn, Cat. Shells, ii, p. 909. 

 1819. Planorbis albus. Mull. : Leach, Moll. Brit. Synop. 



(proofs), p. 156. 

 1821. Planorbis hispidus, var. y : Hartmann, Ncue Alpina, 



i, p. 255. 

 1821. Planorbis albus, Miill. : C. Pfeiffer, Naturg. Deutseh. 



Moll, i, p. 80, 1)1. iv, f. 9 & 10. 

 1823. Helix alba: [Brown], Ency. Brit., ed. 6, vi, p. 458. 



