12 2 Wed, 01/01/1969 - 12:00 July 178 188 SORAUF, J. E. 1969. Lower Devonian Hexagonaria (Rugosa) from the Armorican Massif of western France. Palaeontology, 12, 2, 178–188. J. E. Sorauf The Palaeontological Association (Free Access)