BULL. GEOL. SOC. AM. 



VOL. 20, 1908, PL. 18 



I 



SUPERIOR GRINDERS OF EQUUS SCOTTI GIDLEY 



From the Cox pit, Missouri Valley. Figures 1, 3. Grinding surface and outer side 

 of tooth number 116. Figures 2, 4. Same views of tooth number 117. Figures 5, 6. 

 Grinding surfaces of teeth numbers 119 and 118. All figures natural size. 



