FIGURE 19. Schmelzmuster of Nevadomys fejfari n. gen. and sp. on the ACC and posterior lobe of m1. 1: the leading edge of ACC of a right m1 (21619) from Locality 9504, completely comprising radial enamel. 2: the trailing edge of posterior lobe of the same specimen. A primitive tangential enamel layer is developed on the outside (below right), about one-third of the enamel band. The other part is occupied by radial enamel.