  We present $V$ and $I$ continuum images and H$\alpha$+[N II] maps of nine
early-type galaxies observed with the Wide Field Channel of the Advanced Camera
for Surveys on the Hubble Space Telescope. Dust and ionized gas are detected in
all galaxies. The optical nebulae are primarily concentrated on the nuclei and
extend out to radii of a few hundred parsecs, in compact clumps, filaments, or
disks. Two galaxies, NGC 6166 and NGC 6338, also possess diffuse, ionized
filaments on kiloparsec scales. The ionized gas is entirely contained within
the nuclear disks of ESO 208-G021, NGC 3078, and NGC 7720. In the radio-loud
galaxy NGC 6166, emission-line filaments are detected along the radio lobes,
possibly as a result of shock ionization. A wide range of ionized gas masses,
$M_g\approx7\times10^2-3\times10^6$ $M_\odot$, are calculated from the observed
fluxes. Even in this small sample, the orientation of the ionized material
correlates well with the major or minor axis of the galaxies, consistent with
an external origin for the dust and gas.
