338 E. L. Troxell — Early Pliocene One-Toed Horse. 



long proboscis, but this seems very doubtful. In the present 

 specimen the bone is thin and its surface is smooth ; generally 

 a place of muscle attachment is rugose, thick and porous. The 



Fig. 1. 



Fig. 2. 



facial pits and narrow muzzle give the skull a very thin appear- 

 ance above and in front of the molar teeth. In a mature speci- 

 men the region in front of the orbit would have been much 

 longer, in order to furnish room for the six permanent molars 

 instead of the three deciduous ones. 



