  The in-plane optical properties of two crystals of the bilayer cuprate
\LSxCCO, one with excess Ca and $x=0.10$ and the other with Sr and $x=0.15$,
were investigated over the frequency range of 45--25000 cm$^{-1}$. The optical
conductivity has been derived from Kramers-Kronig transformation. Each crystal
exhibits a peak at around 15000 cm$^{-1}$ which corresponds to the
charge-transfer gap of the parent insulator. With increasing carrier density,
spectral weight shifts from the CT excitation to the low-$\omega$ region. For
the superconducting sample ($x=0.15$), the optical conductivity displays a peak
in the far-infrared region, which shifts toward zero frequency with decreasing
temperature. The temperature-dependent behavior favors a dynamical localization
picture. A ``pseudogap'' feature is observed in the low-frequency reflectance
and the scattering rate spectra. Both the energy scale and the temperature
dependence of the ``pseudogap'' are similar to other bilayer cuprates.
