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We observe a new $D_s$ meson with mass
$(2856.6\pm 1.5_{stat.} \pm 5.0_{syst.})$ \mevcc and width $(48 \pm 7_{stat.} \pm 10_{syst.}) \ \mevcc$ decaying into $D^0\Kp$ and
$D^+K^0_S$. In the same mass distributions
we also observe a broad structure
with mass
$(2688 \pm 4_{stat.} \pm 3_{syst.})$ \ \mevcc and width
$(112 \pm 7_{stat.} \pm 36_{syst.})$ \mevcc.
To obtain this result we use 240~${\rm fb}^{-1}$ of data
recorded by the \babar\ detector at the \pep2 asymmetric-energy $e^+e^-$
storage rings at the Stanford Linear Accelerator Center
running at center-of-mass energies near 10.6 GeV.
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