  Ionized gas and stellar kinematical parameters have been measured along the
major axis of 20 nearby disc galaxies. We discuss the properties of each sample
galaxy distinguishing between those characterized by regular or peculiar
kinematics. In early-type disc galaxies ionized gas tends to rotate faster than
stars and to have a lower velocity dispersion, whereas in late-type spirals gas
and stars show almost the same rotation velocities and velocity dispersions.
Incorporating the early-type disc galaxies studied by Bertola et al. (1995),
Fisher (1997) and Corsini et al. (1999), we have compiled a sample of some 40
galaxies for which the major-axis radial profiles of both the stellar and
gaseous components have been measured. The value of the stellar velocity
dispersion measured at Re/4 turns out to be strongly correlated with the galaxy
morphological type, while the gaseous velocity dispersion is not and sometimes
takes values above the range expected from thermal motions or small-scale
turbulence.
