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We present new calculations of transit spectra of super-Earths that allow foratmospheres with arbitrary proportions of common molecular species and haze. Wetest this method with generic spectra, reproducing the expected systematics andabsorption features, then apply it to the nearby super-Earth GJ 1214b, whichhas produced conflicting observational data, leaving the questions of ahydrogen-rich versus hydrogen-poor atmosphere and the water content of theatmosphere ambiguous. We present representative transit spectra for a range ofclasses of atmosphere models for GJ 1214b. Our analysis supports ahydrogen-rich atmosphere with a cloud or haze layer, although a hydrogen-poormodel with less than 10% water is not ruled out. Several classes of models areruled out, however, including hydrogen-rich atmospheres with no haze,hydrogen-rich atmospheres with a haze of about 0.01-micron tholin particles,and hydrogen-poor atmospheres with major sources of absorption other thanwater. We propose an observational test to distinguish hydrogen-rich fromhydrogen-poor atmospheres. Finally, we provide a library of theoretical transitspectra for super-Earths with a broad range of parameters to facilitate futurecomparison with anticipated data.

Theoretical Transit Spectra for GJ 1214b and Other "Super-Earths"