Sowerby, G. B. I. (1850). Descriptions of some additional species of Cyclostoma. In G. B. Sowerby II (ed.), Thesaurus conchyliorum, or monographs of genera of shells. Vol. 2 (11): 157*–168*, pls 31A, 31B. London, privately published.
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Sowerby, G. B. I
1850
Descriptions of some additional species of <i>Cyclostoma</i>. In G. B. Sowerby II (ed.), <i>Thesaurus conchyliorum, or monographs of genera of shells</i>. Vol. 2 (11): 157*–168*, pls 31A, 31B. London, privately published.