Angular distributions of dayside ring current energetic ions are studied with the Medium Energy Particle Analyzer (MEPA) on the Active Magnetospheric Particle Tracer Explorers/Charge Composition Explorer spacecraft. The anisotropy index n for pancake distribution during 10 geomagnetically quiet days is examined for the first time in the intermediate energies (50--1000 keV) for which compositional information is now available. It is shown that n for protons and helium ions increases with L whereas n for CNO ions appears to be independent of L. The empirical formula n(E)=n0+k log10 (E(MeV)), for the energy dependence given by Fritz and Spjeldvik (1982), is extended to these energies and ion species. The parameter n0 is found to increase generally with ion mass and L, except for CNO ions which show no noticeable L dependence. The parameter k appears to be independent of L and ion mass. We have also surveyed the varieties of pitch angle distributions. Two unusual distributions were detected during the September 4--7, 1984, geomagnetic storm. The first is a net field-aligned transport of ring current energetic ions at 6≲L≲9 and 1030--1300 MLT. Such a signature is shown most prominently by the heavy ions (mostly oxygen; E>137 keV), to a lesser extent by helium ions (E>72 keV), and only slightly by protons (E>56 keV) which are the dominant ionic species. The second new feature is a sharp intensity enhancement over a pitch angle range centered at 90¿ which occurs in all ionic species and energy passbands monitored by MEPA at 3≲L≲4 and 1700--1800 MLT. Its characteristics suggest that it represents the addition of a freshly injected ring current population in the main phase development of the storm, and not due to L shell splitting or wave-particle interaction. ¿ American Geophysical Union 1990