Adams, A. (1854). Monographs of the genera Eulima, Niso, Leiostraca, Obeliscus, Pyramidella, and Monoptygma. In G. B. Sowerby II (ed.), Thesaurus conchyliorum, or monographs of genera of shells. Vol. 2 (15): 793-825, pl. 169-172. London, privately published.
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Adams, A.
1854
Monographs of the genera <i>Eulima</i>, <i>Niso</i>, <i>Leiostraca</i>, <i>Obeliscus</i>, <i>Pyramidella</i>, and <i>Monoptygma</i>. In G. B. Sowerby II (ed.), <i>Thesaurus conchyliorum, or monographs of genera of shells</i>. Vol. 2 (15): 793-825, pl. 169-172. London, privately published.
