  We continue our study of the astrophysical implications of the linear
potential $V(r)=-\beta c^2/r+\gamma c^2 r/2$ associated with fundamental
gravitational sources in the conformal invariant fourth order theory of gravity
which has recently been advanced by Mannheim and Kazanas as a candidate
alternative to the standard second order Einstein theory. We provide fitting to
the rotation curves of an extensive and diverse set of 11 spiral galaxies whose
data are regarded as being particularly reliable. Without the assumption of the
existence of any dark matter the model is found to fit the shapes of the
rotation curves extremely well, but with a pattern of normalizations which
proves to be very instructive.
