  We study the effect of the magnetic field geometry on the oscillation spectra
of strongly magnetized stars. The magnetic field distributions include both
toroidal and poloidal contributions. We observe that the toroidal contribution
does not influence significantly the torsional oscillations of the crust.
Moreover, in the case that the core is a type I supercontactor and the magnetic
fields are confined in the crust, the torsional oscillation spectrum is
drastically affected by the presence of the strong magnetic fields. Comparison
with results and estimations for the magnetic field strength, from
observations, exclude the possibility that magnetars will have a magnetic field
solely confined in the crust i.e. our results suggest that the magnetic field
in whatever geometry has to permeate the whole star.
