FIGURE 4. Postcopemys repenningi, gen. and sp. nov. from the Maxum fossil site, Tassajera Formation, California; occlusal views of lower molars: 1, right m1 (UCMP 87897). 2, left m1 (UCMP 87901). 3, right m2 (UCMP 87559). 4, left m2 (UCMP 87921). 5, right m3 (UCMP 87924). 6, left m3 (UCMP 87905).