ID number: BIRUG: BU71 Institution: The Lapworth Museum of Geology Definition: Mastigocrinus arboreus (Salter, 1873) Object type: Crinoidea Place collected: ENGLAND: West Midlands, Dudley Collector: Ketley Chronostratigraphy: SILURIAN: Wenlock Lithology: Much Wenlock Limestone Formation Type, figured or cited: Figured