  We present results from Experiment 864 for antiproton production and
antideuteron limits in Au + Pb collisions at 11.5 GeV/c per nucleon. We have
measured invariant multiplicities for antiprotons for rapidities 1.4<y<2.4 at
low transverse momentum as a function of collision geometry. When compared with
the results from Experiment 878 our measurements suggest a significant
contribution to the measured antiproton yield from the decay of strange
antibaryons. We have also searched for antideuterons and see no statistically
significant signal. Thus, we set upper limits on the production at
approximately 3 x 10^{-7} per 10% highest multiplicity Au + Pb interaction.
