106 



osborn: oligocene, miocene, pliocene equhxe. 



Fig. 80. Merychippus ison'esus tertius Osborn. (3, 5, 5a) Amer. Mus. 14180, type. (3) Side view of upper and 

 lower type dentition of the left side; (5) crown view of superior grinding teeth of type; (5a) external view of type m 3 ; (6) 

 crown view of p 3 -m 3 of referred specimen, Amer. Mus. 14183, reversed in drawing. All figures natural size. 



