Sowerby, G. B. II. (1842). Monograph of the genus Helicina. In G. B. Sowerby II (ed.), Thesaurus conchyliorum, or monographs of genera of shells. Vol. 1 (1): 1–16, pls 1–3. London, privately published [May 1842].
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Sowerby, G. B. II
1842
Monograph of the genus <i>Helicina</i>. In G. B. Sowerby II (ed.), <i>Thesaurus conchyliorum, or monographs of genera of shells</i>. Vol. 1 (1): 1–16, pls 1–3. London, privately published [May 1842]