FIGURE 6. Postcopemys maxumensis sp. nov., from the Maxum fossil site, Tassajera Formation, California; occlusal views of upper molars: 1, right M1 (UCMP 87942). 2, left M1 (UCMP 87891). 3, right M2 (UCMP 87918). 4, right M3 (UCMP 87973). 5, left M3 (UCMP 87951).