Sowerby, G. B. I. (1824). Descriptions, accompanied by figures, of several Helices, discovered by T. E. Bowdich, Esq. at Porto Santo. Zoological Journal. 1: 56-58 [March].
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Sowerby, G. B. I
1824
Descriptions, accompanied by figures, of several Helices, discovered by T. E. Bowdich, Esq. at Porto Santo