Results of an angular distribution analysis of electron intensity data recorded by the University of Iowa experiment aboard Pioneer 10 are presented for the Jupiter encounter period November 26 through December 14, 1973. The data were from three directional particle detectors with effective integral energy threholds of Ee=0.06, 0.55, and 5.0 MeV, respectively. It is found that the central core of the magnetosphere for radial distances less than 12 Rj (Jovian radii) is dominated by pitch angle distributions strongly peaked at &agr;=90¿, while the region of radial distances 12--25 Rj shows bidirectional and approximately equal maxima at &agr;=0¿ and 180¿. Bidirectional angular distributions in the magnetosphere out to the radius of the magnetopause strongly suggest quasi-trapping on closed field lines as the predominant situation. Substantial field-aligned unidirectional streaming was detected on only two occasions, each of about 1-hour duration; one of these episodes immediately preceded the return of particle count rates to near-interplanetary values for 3 hours on December 1. No distinctive effects on angular distributions were discerned near the L shells of satellits. Some interpretative suggestions are made.