BULL. GEOL. SOC. AM. 



VOL. 20, 1908, PL. 19 



INFERIOR CHEEK TEETH OF FOSSIL HORSES 



From the Cox pit, Missouri Valley. Figures 1 and 3 and 2 and 4 illustrate two of 

 the thin, nearly cementless lower teeth with thin, flexuous enamel, referred to Equus 

 complicatus Leidv. Figure 5 is a short, well-worn tooth of the same species. The two 

 molars of figure 6 have the same characteristics as the lower teeth of the Gladwin horse, 

 Equus scotti (plate 17, figure 2). Natural size. 



