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We describe and model high velocity (~15,000 km/s) Lyman alpha and Balmeralpha emission from supernova remnant 1987A seen in September and October 1997with the Space Telescope Imaging Spectrograph. Part of this emission comes froma reverse shock located at ~75% of the radius of the inner boundary of theinner circumstellar ring and confined within 30 degrees of the equatorialplane. Departure from axisymmetry in the Lyman alpha and Balmer alpha emissioncorrelates with that seen in nonthermal radio emission and reveals an asymmetryin the circumstellar gas distribution. We also see diffuse high velocity Lymanalpha emission from supernova debris inside the reverse shock that may be dueto excitation by nonthermal particles accelerated by the shock.Comment: 10 pages, 3 postscript figures. Submitted to ApJL on Sept 8, 1998;  accepted Oct. 20, 1998. Text adjusted to referee's comment

New [ITAL]Hubble Space Telescope[/ITAL] Observations of High-Velocity L[CLC]y[/CLC]α and Hα in SNR 1987A