Vexillum umbrosum is a species of sea snail, a marine gastropod mollusk, in the family Costellariidae, the ribbed miters.MolluscaBase (2018). Vexillum umbrosum (G. B. Sowerby II, 1874). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=881434 on 2018-12-31
Description The colouring of the shell is dark rich burnt brown. The ribs more defined than in Voluta vulpecula Linnaeus, 1758, raised into tubercles at the angle of the whorls.Sowerby, G. B. II. (1874). Monograph of the genus Mitra. In G. B. Sowerby II (ed.), Thesaurus conchyliorum, or monographs of genera of shells. Vol. 4 (31-32): 1–46, pls 352–379. London, privately published
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