  Assuming that the recently observed $\Theta^+$ and $\Xi^{--}$ are members of
an anti-decuplet of SU(3), decays to ground state baryons and mesons are
calculated using an effective Lagrangian which incorporates chiral and SU(3)
symmetry. We consider the possible quantum number assignments $J^\Pi
={1/2}^\pm,{3/2}^\pm$ and calculate ratios of partial widths. The branching
ratios of exotic cascades can be used to discriminate between even and odd
parity pentaquarks.
