  We construct near-infrared to visible broad band NICMOS/WFPC color maps for 4
early-type Seyfert galaxies with S-shaped or one-sided ionization cones. We
find that dust lanes are near or connected to many of the features seen in the
[OIII] and H$\alpha$+[NII] line emission maps. This suggests that much of the
structure of line emission in these ionization cones is determined by the
distribution of ambient dense galactic gas. Spiral arms, dust lanes caused by
bars, or gaseous warps provide dense gas which when illuminated by a conical
beam of ultraviolet photons can result in the complicated line emission
morphologies observed.
