  We report the observation of the Cabibbo-suppressed decays \lcpkk\ and
\lcpphi\ using data collected with the CLEO II detector at CESR. The latter
mode, observed for the first time with significant statistics, is of interest
as a test of color-suppression in charm decays. We have determined the
branching ratios for these modes relative to \lcpkpi\ and compared our results
with theory.
