PLANORBIS 79 



1871. Planorbis cavatus : Westerlund, Nova Acta Soc. Set. 



Upsala, Scr. Ill, vol. viii, no. ], p. 133. 

 1873. Planorbis (Gyraulus) deformis, Hartm. : Westerlund, 



Fauna Moll. Svecice, p. 394. 

 1875. Planorbis (Gyraulus) devians, Porro : Westerlund, 



Malak. Bldtt., xxii, p. 112. 

 1875. Planorbis (Gyraulus) cavatus, West. : Westerlund, I. c, 



ill synon. 

 1881. Planorbis (Gyraulus) stromi, nov. sp. : Westerlund, 



Of vers. K. Vet. Akad. Furhandl. Stockholm, 



xxxviii, no. i, p. 63. 



First recorded as British in 1890, by B. B. Woodward 

 (Proc. Gcol. Assoc, xi, p. 339) as a var. of P. carinalus. 

 British Distribution in Time : Holocene and Recent. 



8. Planorbis (Gyraulus) crista (Linue). 

 Etyin. : — Lat. crista, a crest. 



1758. Nautilus crista : Linn^us, Syst. Nat ed 10 p 709 



no. 234. 

 1767. Turbo Nautileus : Linn^us, o. c, ed. 12, p. 1241, no. 654. 

 1774. Planorbis imbricatus : Muller, Verm. Hist., ii,' p. 165. 

 1791. Turbo nautileus : Guelin, in Linn. Syst. Nat ed 13 



i, pt. 6, p. 3612, no. 98. > • ' 



1798. Helix carinata : Jacob, in Adams' Essays on Micro. 



ed. 2, p. 635, pi. xiv, f. 10. 

 1798. Helix spinosa : Jacob, o. c, p. 636, pi. xiv, f. 11. 



1801. Planorbis imbricatus : Br af arn av t>, Tabl' Moll France 



p. 46. 



1802. Helix carinata: Linn/EUS, Gen. Syst. Nature, trans. 



Turton, iv, p. 510. 



1802. Helix spinosa : Linn^us, t. c, p. 525. 



1803. Helix nautileus, Lin. : Montagu, Test. Brit., p. 464, 



pi. XXV, f. 5. 

 [According to Montagu (Test. Brit., Suppt., p. 146) this 

 species occurred in the Portland Collection under the 

 name of Helix nautiloides.] 

 1805. Planorbis imbricatus : Draparnaud. Hist. Moll. France 



p. 44, pi. i, f. 49-51. 

 1805. Planorbis cristatus : Draparnaud, o. c. p 44 pi H 



f. 1-3. ' F • . 



1807. Turbo naittileus, Linn. : Maton & Rackett, Trans. 



Linn. Soc, viii, p. 169. 

 1813. Turbo nautileus: Rackett, in Pultcney, Cat. Dorset., 



ed. 2, p. 50, pi. xix, f. 16. 

 1813? Planorbis cristatus : Fleming, Edinb. Ency., vii, p. 69. 

 1813? Planorbis nautileus : Fle.ming, ?. c. 

 1817. Turbo nautileus, Linn. : Dillwyn, Cat. Shells, ii 



p. 882. 



