@inbook{NARMS:SourceID:8816, author = {Adams, A.}, title = {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. }, url = {https://www.biodiversitylibrary.org/page/11076023}, year = {1854} }