  In the paper we consider several dynamical systems that admit a separation of
variables on the algebraic curve of genus 4. The main result of the paper is an
explicit formula for the action of these systems. We find it directly from the
Hamilton-Jacobi equation. We find the action and a separation of variables for
the Kowalewski hyrostat, the Clebsch and the so(4) Schottky-Manakov spinning
tops.
