  A large data set of proton-nucleus collisions at sqrt(s) =41.6 GeV has been
searched for Theta+ and Xi(1862) pentaquark candidates. In 2x10**8 inelastic
events we find no evidence for narrow signals (sigma=5 MeV/c**2) in the Theta+
--> pK0s and Xi--(1862) --> Xi- pi- channels. Upper limits on production cross
sections at mid-rapidity and on ratios of production cross sections to those of
well established resonances are presented.
