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Verdcourt, B. (1958). A new species of Ptychotrema Mörch (Mollusca: Gastropoda) from Tanganyika together with a check list of the East African species and keys for their determination. Journal of the Linnean Society of London. 43: 714-720.
Verdcourt, B. (1958). A new species of Ptychotrema Mörch (Mollusca: Gastropoda) from Tanganyika together with a check list of the East African species and keys for their determination. Journal of the Linnean Society of London. 43: 714-720.
