[en] anti pp annihilation cross sections into 2-, 4- and 6-prong topologies, and the exclusive annihilation cross sections for the π⁺ π^-, K⁺ K^-, π⁺ π^- π₀, π⁺ π⁺ π^- π^-, π⁺ π⁺ π^- π^- π₀, π⁺ π⁺ π⁺ π^- π^- π^-, and π⁺ π⁺ π⁺ π^- π^- π^- π₀ channels in the momentum range 374-680 MeV/c were measured. No prominent structure was observed in the momentum dependence of any of the above cross sections, but a small enhancement in the cross section was observed at 490 MeV/c corresponding to the S meson mass in the topological, and π⁺ π^- π₀ and π⁺ π⁺ π^- π^- π₀ cross sections. If the existence of the S meson with a mass and width of 1935.5 and 2.8 MeV/c₂ is assumed, our measurement gives a total resonant annihilation cross section into charged particles of 10.0 +- 3.0 mb. (orig.)