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A monograph of the British fossil Crustacea Pl. XXI . Soc ORDER RYPTEMDA PI Giiesbacb 'ieLetlth TYLOIURUS MrHtena Bros nop Pl XXI Illustration biodiversitylibrary org title Woodward Henry Biodiversity Heritage Library National Fossil Day monograph of the British fossil Crustacea belonging to the order Merostomata Crustacea