  We have obtained radial velocities of 68 planetary nebulae surrounding the
SB0 galaxy NGC 3384 in the Leo I group, using the CTIO 4 m telescope and the
Rutgers Fabry-Perot interferometer. The PN system exhibits a well-ordered
rotation field aligned with the photometric axes of the galaxy. The rotation
curve is flat from about 2 kpc until at least 7 kpc. Our results imply that at
least a third of the dynamical mass of the NGC 3379/3384 system may be
accounted for in the two bright galaxies.
