References
- Blackith , R.E. and Reyment , R.A. 1971 . Multivariate Morphometrics , London and New York : Academic Press .
- Clessin , S. 1874 . Die gruppe Fruticicola des genus Helix L. . Jahrbuch der Deutschen Malakozoologischen Gesellschaft , 1 : 177 – 194 . 305–336.
- Clifford , H.T. and Stephenson , W. 1975 . An Introduction to Numerical Classification , London and New York : Academic Press .
- Draparnaud , J.P.R. 1805 . Histoire Naturelle des Mollusques Terrestres et Fluviatiles de la France Paris
- Ellis , A.E. 1969 . British Snails. A guide to the Non-marine Gastropoda of Great Britain and Ireland. Pleistocene to Recent , 2nd edition , Oxford : Clarenden Press .
- Forcart , L. 1965 . “ New researches on Trichia hispida (Linnaeus) and related forms ” . In Proceedings of the First European Malacological Congress , Edited by: Cox , L.R. and Peake , J.F. London : The Conchological Society of Great Britain and Ireland and the Malacological Society of London . In
- Hartmann , J.D.W. 1840 . Erd- und Süsswasser Gasteropoden Part 1, St Gallen.
- Jeffreys , J.C. 1830 . A synopsis of the testaceous pneumonobranchous Mollusca of Great Britain . Transactions of the Linnean Society of London , 16 : 323 – 392 .
- Kerney , M.P. and Cameron , R.A.D. 1979 . A Field Guide to the Land Snails of Britain and North-west Europe , London : Collins .
- Kerney , M.P. 1976 . Atlas of the Non-marine Mollusca of the British Isles , Cambridge : Institute of Terrestrial Ecology .
- Klöeti-Hauser , E. 1920 . Beiträge zur anatomie des Geschlechtsapparates einiger schweizerischer Trichia-(Fruticicola-, Helix) Arten , Zurich : Zurich University .
- Linnaeus , C. 1758 . Caroli Linnaei Systema Naturae per regna tria Naturae Holmia
- Locard , A. 1888 . Contributions à la faune malacologique française, XII. Études critiques sur les Helix du groupe de Helix rufescens . Annales de la Societe Linneene de Lyone , 34 : 309 – 370 .
- Naggs , F.C. 1982 . A morphometric investigation into the Trichia species complex in Central and SE England , Unpublished M.Sc dissertation, Council for National Academic Awards .
- Naggs , F.C. 1983 . Perforatella: the helicid snail newly recorded in Britain and other genera commonly confused with Trichia . Journal of Conchology , 31 : 201 – 206 .
- Owen , G. and Steedman , H.F. 1958 . Preservation of molluscs . Proceedings of the Malacological Society of London , 33 : 101 – 103 .
- Paul , C.R.C. 1975 . The ecology of mollusca in ancient woodland. I. The fauna of Hayley Wood, Cambridgeshire . Journal of Conchology , 28 : 301 – 327 .
- Pfeiffer , C. 1928 . Naturgeschichte deutscher land- und Süsswassermollusken 3. Weimar.
- Raup , D.M. 1962 . Computer as an aid in describing form in gastropod shells . Science, New York , 138 : 150 – 152 .
- Runham , N.W. , Isarakura , K. and Smith , B.J. 1965 . Methods for narcotizing and anaesthetizing gastropods . Malacologia , 2 : 231 – 238 .
- Schmidt , A. 1853 . Über einige arten von Clausilia und Helix . Zeitschrift für die Gesammten Naturwissenschaften Halle , 1 : 1 – 10 .
- Shileyko , A.A. 1978 . On the systematics of Trichia s. lat (Pulmonata: Helicoidea: Hygromiidae) . Malacologia , 17 : 1 – 56 .
- Sneath , P.H.A. and Sokal , R.R. 1973 . Numerical Taxonomy , San Francisco : W.H. Freeman .
- Thorpe , R.S. 1976 . Biometric analysis of geographic variation and racial affinities . Biological Reviews , 51 : 407 – 452 .
- Thorpe , R.S. 1980 . A comparative study of ordination techniques in numerical taxonomy in relation to racial variation in the ringed snake Natrix natrix (L.) . Biological Journal of the Linnean Society , 13 : 7 – 40 .
- Waldén , H.W. 1976 . A nomenclatural list of the land Mollusca of the British Isles . Journal of Conchology , 29 : 21 – 25 .