Emission signals from the Saturnian plasmasphere at wavelengths shortward of 800 Å have been detected by the Pioneer ultraviolet photometer. The surface brightness of the emissions is about 0.3 ± 0.2 R. These short-wavelength emissions are interpreted as arising primarily from the radiative decay of electron excited atomic oxygen ions (O⁺⁺), in the region between 5 and 7 R_s from Saturn. The total power radiated by the Saturnian plasma inferred from these ultraviolet measurements is about ∼ 2 × 10¹⁶ erg s⁻¹, consistent with in situ plasma measurements. From the observed energy loss rate it is estimated that the ions are introduced into the plasma torus at a rate of 8 × 10²⁵ ions/s, possibly through the sputtering of water ice on the surface of Tethys and Dione by particle impact.