MolluscaBase source details
Ulrich, E. O. (1911). Revision of the Paleozoic systems. Bulletin of the Geological Society of America. 22: 281-680.
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Ulrich, E. O.
1911
Revision of the Paleozoic systems
Bulletin of the Geological Society of America
22: 281-680
Publication
Sinuopea Ulrich, 1911 † (original description)