Original description, by Linnaeus (1758, p. 681): "C. testa antiquata: sulcis XXVI obsolete recurvato-imbricatis. Fn. svec. 1340. List. angl. 189. t. 5. f. 34. Gualt. test. 71. f. F. Habitat in O. Europaeo."
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith