NEAR-INFRARED AND OPTICAL SPECTROSCOPY OF FSC-10214+4724

New infrared and optical spectroscopic observations, obtained with the W. M. Keck Telescope, are reported for the highly luminous infrared s ource FSC 10214+4724 The rest frame optical spectrum shows new emissio n lines of [Ne III], [Ne V], [O I], [O II], [S II], and He+, while the rest frame ultraviolet spectrum shows new lines of O IV] + Si IV, N I II, N IV], Si II, Ne IV, and possibly N II and [Ne III], as well as cl early showing that Ly alpha is self-absorbed. The emission-line spectr um is most characteristic of a Seyfert 2 nucleus. The preponderance of spectroscopic evidence strengthens the case for a dust-enshrouded AGN powering much or most of the observed luminosity. The various spectra l lines lead to a wide range in the inferred reddening and ionization parameter for this system, suggesting that we are viewing several envi ronments through differing extinctions.