PLATE 4 9 



ULNO- RADIUS OF MERYCHIPPUS CAMPESTRIS, M. EOPLACIDUS, M. EOH1PPAR10N. 

 COMPARISON OF THREE SPECIES FROM THE PAWNEE CREEK BEDS OF NORTHEASTERN COLORADO. 



All figures one-half natural size. 



The ulnar shaft is much reduced in M . rarnpcstris and M. eoplacidus, and imperfectly united to radius in all. Compare 

 Plate 50. 



Pawnee Creek, Col. Middle Miocene 1. Merychippus campestris Gidley, type, Am. Mus. 9096. Associated with 



upper and lower jaws and large part of skeleton, a, Anterior, b, external 

 views. 



2. M. eoplacidus Osborn, type, Am. Mus. 9397. Associated with lower jaws 

 and part of skeleton. Same views as 1. 



3. M. eohipparion Osborn, type, Am. Mus. 9402. Associated with lower jaws 

 and greater part of skeleton. Same views as 1. 



U 11 U It 



320 



