  We report on the analyses of the baryonic B decays B0bar -> LambdaC+ p- p+ p-
and B- -> SigmaC++ p- pi- pi-. The underlying data sample consists of 470 x
10^6 BBbar pairs generated in the process e+e- -> Y(4S) and collected with the
BaBar detector at the PEP-II storage ring at SLAC. We find BR(B0bar -> LambdaC+
p- p+ p-) x BR(LambdaC+ -> p+ K- pi+) / 5% < 6.2 x 10^(-6) @ CL=90% and BR(B-
-> SigmaC++ p- pi- pi-) = [2.98 +/- 0.16(stat) +/- 0.15(syst) +/-
0.77(LambdaC+)] x 10^(-4), where the last error is due to the uncertainty in
BR(LambdaC+ -> p+ K- pi+). The data suggest the existence of resonant
subchannels B- -> LambdaC(2595)+ p- pi- and, possibly, B- -> SigmaC++
anti-Delta-- pi-. We see unexplained structures in m(SigmaC++ pi- pi-) at 3.25
GeV/c^2, 3.8 GeV/c^2, and 4.2 GeV/c^2.
