ID number: BIRUG: BU391 Institution: The Lapworth Museum of Geology Named collection: Holcroft Collection Definition: Ktenoura retrospinosa Lane Object type: Trilobita Place collected: ENGLAND: West Midlands, Dudley Collector: Holcroft Chronostratigraphy: SILURIAN: Wenlock Lithology: Wenlock Limestone Type, figured or cited: Figured