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FIGURE 31. Schmelzmuster of Nevadomys downsi n. gen. and sp. on the trailing edge of the anterior lobe of M1. 1: the prism on the anterior lobe of a left M1 (21999) from Locality 9621, composed of radial enamel. 2: the trailing edge on the anterior lobe of the same tooth. A trace of primitive tangential enamel is present (top).