  Motivated by the recent surprising discovery of two new meson states with c
s-bar quark content but unexpectedly low masses and narrow total decay widths,
we work out, in a nonrelativistic potential-model approach developed already
some two decades ago, the predictions for the energy levels of the
corresponding charm-antistrange quark bound states. In spite of the fact that
this simple quark model reproduces the mass spectrum of the previously observed
hadrons remarkably well, we are led to the conclusion that, without
considerable modifications, both the new states do not fit into this framework.
