ID number: BIRUG: BU76 Institution: The Lapworth Museum of Geology Named collection: Holcroft Collection Definition: Calymene blumenbachii Brongniart, 1817 Object type: Trilobita Place collected: ENGLAND: West Midlands, Dudley, Wren's Nest Collector: Holcroft, Sir Charles Chronostratigraphy: SILURIAN: Wenlock Lithology: Much Wenlock Limestone Formation, Monograptus nilssoni zone Type, figured or cited: Figured