  Production of Lambda and Antilambda hyperons was measured in central Pb-Pb
collisions at 40, 80, and 158 A$\cdot$GeV beam energy on a fixed target.
Transverse mass spectra and rapidity distributions are given for all three
energies. The $\Lambda/\pi$ ratio at mid-rapidity and in full phase space shows
a pronounced maximum between the highest AGS and 40 A$\cdot$GeV SPS energies,
whereas the $\bar{\Lambda}/\pi$ ratio exhibits a monotonic increase.
