O'Connell, Daniel, physiognomy of, Ch. VI n.[6]; his descent, [64], [65]; failed to encourage the national language, [626]
O'Conollys, the, [35]
O'Coileáins or Collinses, [62]
O'Cronins, [62]
O'Crowleys, [65]
O'Curneen, Father Patrick, Poet, [545]
O'Curry, Eugene, [xi], [116], [117], [137], [154], [211], [606]; his list of lost books, [265]; on the number of existing Irish sagas, [279], [358], [404], [426], [433]; on some poems in Book of Leinster, [471]; on ocht-foclach metre, [544]; on Mac Firbis's genealogies, [564]; his work on the Brehon Law, [583]
O'Dalys, the, [62], [64], [544]
O'Daly, Donogha Mór, of Boyle, poet, [271], [466] ff.
O'Daly, Cuchonnacht, Book of, [439]