Douglass : Fossil Horses. 277 



Fig. 3. Altippus taxus sp. nov. Type. No. 836. From Divide Creek, near 

 Woodin, Montana. Anterior view, of hind foot. 



Fig. 4. Altippus taxus sp. nov. Type. No. 836. Lateral view of foot. 



Fig. 5. Merychippus missouriensis . Paratype. No. 858. From Missouri Val- 

 ley, east of Winston, Montana. Anterior view of hind foot. 



Explanation of Plate LXVIII. 



Miocene Horses from Montana. 



All figures except 6 and 7 one half natural size. Figures 6 and 7 natural size. 



Fig. 1. Merychippus missouriensis sp. nov. Type. No. 905. From Missouri 

 Valley, east of Winston, Montana. Left upper cheek teeth. The milk molars and 

 the first two permanent molars. 



Fig. 2. Merychippus missouriensis sp. nov. Type. No. 905. Inferior milk 

 dentition. 



Fig. 3. Merychippus insignis ? Leidy. No. 1377. From Deep Creek, southeast 

 of Townsend, Montana. Fragmentary superior dentition. 



Fig. 4. Merychippus insignis? Leidy. No. 1377. Lower cheek teeth. Top 

 view. 



Fig. 5. Merychippus insignis ? Leidy. No. 1377. Right ramus of mandible with 

 cheek teeth. 



Fig. 6. Altippus taxus sp. nov. Type. No. 836. From Divide Creek, Mon- 

 tana. Four temporary upper molars and first two molars of right side. Natural size. 



Fig. 7. Altippus taxus sp. nov. No. 836. Lower temporary molars and first 

 two permanent molars of right mandible. Natural size. 



Fig. 8. Altippus taxus sp. nov. No. 836. Portions of skull and mandible. 



