  We present studies of two-body and three-body charmed baryonic B decays in a
sample of 232 million $B\bar{B}$ pairs collected with the BABAR detector at the
PEP-II $e^+e^-$ storage ring. The branching fractions of the decays
$\bar{B}^{0} \to \Lambda_{c}^{+} \bar{p}$ and $B^{-} \to \Lambda_{c}^{+}
\bar{p} \pi^{-}$ are measured to be $(2.15 \pm 0.36 \pm 0.13 \pm 0.56) \times
10^{-5}$ and $(3.53 \pm 0.18 \pm 0.31 \pm 0.92)\times10^{-4}$, respectively.
The uncertainties quoted are statistical, systematic, and from the
$\Lambda_{c}^{+} \to p K^- \pi^+$ branching fraction. We observe a
baryon-antibaryon threshold enhancement in the $\Lambda_{c}^{+} \bar{p}$
invariant mass spectrum of the three-body mode and measure the ratio of the
branching fractions to be ${\cal B}(B^{-} \to \Lambda_{c}^{+} \bar{p}
\pi^{-})/{\cal B}(\bar{B}^{0} \to \Lambda_{c}^{+} \bar{p}) = 16.4 \pm 2.9 \pm
1.4$. These results are preliminary.
