MolluscaBase taxon details
original description
(of Helix bilamellata G. B. Sowerby I, 1844) Sowerby, G. B. I. (1844). Description of fossil shells. Appendix to Part I, 153–160. In: Darwin, C. R., <i>Geological observations on the volcanic islands, visited during the voyage of H.M.S. Beagle, together with some brief notices on the geology of Australia and the Cape of Good Hope. Being the second part of the geology of the voyage of the Beagle, under the command of Capt. Fitzroy, R.N. during the years 1832–1836</i>. Smith, Elder and Co., London. i–vii, 1–175. [Reprinted 1851, 1876, 1897]. , available online at https://archive.org/details/geologicalobser01darwgoog/page/n158/mode/1up
page(s): 157 [details]
original description
(of Patula bilamellata var. unilamellata E. A. Smith, 1892) Smith, E. A. (1892). On the land-shells of St. Helena. <em>Proceedings of the Zoological Society of London.</em> (1892): 258-270, pls 21-22., available online at https://biodiversitylibrary.org/page/31848767
page(s): 262. [details]
basis of record
Solem, A. (1977). Fam. Charopidae. in: La Faune terrestre de l'île de Sainte-Hélène. <em>Annales du Musee Royal de l'Afrique Central, Sciences zoologiques.</em> 4: 521-533, pls 5-8. [details]