  Recently LHCb reported the discovery of five extremely narrow excited
$\Omega_c$ baryons decaying into $\Xi_c^+ K^-$. We interpret these baryons as
bound states of a $c$-quark and a $P$-wave $ss$-diquark. For such a system
there are exactly five possible combinations of spin and orbital angular
momentum. The narrowness of the states could be a signal that it is hard to
pull apart the two $s$-quarks in a diquark. We predict two of spin 1/2, two of
spin 3/2, and one of spin 5/2, all with negative parity. Of the five states two
can decay in $S$-wave and three can decay in $D$-wave. Some of the $D$-wave
states might be narrower than the $S$-wave states. We discuss relations among
the five masses expected in the quark model and the likely spin assignments and
compare with the data. A similar pattern is expected for negative-parity
excited $\Omega_b$ states. An alternative interpretation is noted in which the
heaviest two states are $2S$ excitations with $J^P = 1/2^+$ and $3/2^+$, while
the lightest three are those with $J^P = 3/2^-,3/2^-,5/2^-$ expected to decay
via $D$-waves. In this case we expect $J^P = 1/2^-$ $\Omega_c$ states around
2904 and 2978 MeV.
