When the Lagrangian points L4, L5 in a rotating dynamical system become unstable (at a critical perturbation e = el) the characteristics of some families of orbits bifurcating from the short and long period orbits (SPO and LPO) become spiral. For a given e, slightly larger than et, an infinity of families of multiplicities n, n + 1, n + 2 .... do not bifurcate any more from SPO or LPO but join each other into a spiral. As e increases this spiral is joined by lower multiplicity families, until the SPO-LPO family itself joins the spiral. Further spirals with the same or different focuses are formed by joining other sequences of families of order n, n + 1, n + 2,..., or n, n + 2, n + 4,.... Other spirals are generated at particular values of E, starting and terminating at the same focus or two different focuses. As the perturbation e increases such spiral characteristics join other families, away from the focus. The orbits along the spiral characteristics have an increasing number of loops (either n, n + 1, n + 2 ..... or n, n + 2, n + 4... ) around, or close to L 4. In the first case the loops are along the symmetry axis, passing through L4. In the second case the loops appear in pairs outside the symmetry axis. The focuses correspond to homoclinic, or heteroclinic orbits, spiralling around/-,4 and/or L 5.