Article: The Carboniferous coral Palaeacis in Ireland
The tabulate coral Palaeacis Haime, 1857 is common in North America, but in Europe only two indigenous species occur, both in Ireland. P. smythi Hudson, 1966 is distinguished from P. axinoides Smyth, 1929 by having only two corallites and a non-adherent corallum. P. sp. nov. has a conical corallum with a single corallite. These species have limited stratigraphical ranges in the Courceyan and basal Chadian stages and are useful zonal indices.