  In a previous paper the complex-shift method has been applied to
self-gravitating spherical systems, producing new analytical axisymmetric
density-potential pairs. We now extend the treatement to the Miyamoto-Nagai
disc and to the Binney logarithmic halo, and we study the resulting
axisymmetric and triaxial analytical density-potential pairs; we also show how
to obtain the surface density of shifted systems from the complex-shift of the
surface density of the parent model. In particular, the systems obtained from
Miyamoto-Nagai discs can be used to describe disc galaxies with a peanut-shaped
bulge or with a central triaxial bar, depending on the direction of the shift
vector. By using a constructive method that can be applied to generic
axisymmetric systems, we finally show that the Miyamoto-Nagai and the Satoh
discs, and the Binney logarithmic halo, cannot be obtained from the
complex-shift of any spherical parent distribution. As a by-product of this
study we also found two new generating functions in closed form for even and
odd Legendre polynomials, respectively.
