Thirty previously unclassified emission lines all broadened by autoionization, have been observed in the Hg I spectrum. Half of these have been assigned to transitions involving 5d⁹6s²7s ³D₂, ³D₃ and 5d¹⁰6p² ³P₂' as upper levels. Approximate Fano parameters are given for eight of the lines. It is suggested that the position of the 5d⁹6s²6p ³D₃⁰ level be revised, and a tentative identification is made of 5d⁹6s²6p ¹F₃⁰.