BioStor
 | IV.—On the terrestrial and fluviatile Mollusca of Trinidad R J Lechmere Guppy (1866) Annals And Magazine of Natural History 17: 42-56 |
 | April 20, 1875 Osbert Sabin (1875) Proceedings of The Zoological Society of London 1875: 316-348 |
 | An account of the land and freshwater Mollusca collected during the Voyage of the Challenger from December 1872 to May 1876 E A Smith (1884) Proceedings of the Zoological Society of London 1884: 258-281 |
 | Révision de Hirudinées du Musée de Turin Raphaël Blanchard (1893) Bollettino dei musei di zoologia ed anatomia comparata della R. Università di Torino 8(145): 1-32 |
 | Notes on Physidae with descriptions of new species (1930) Occasional Papers of The Boston Society of Natural History 5: 301-315 |