PLATE 20. 



SKULL AND LOWER TEETH OF MERYCHIPPUS FROM NORTHEASTERN COLORADO. 

 COMPARISON OF THE OUTER AND CROWN VIEWS OF THE TEETH OF FOUR SPECIES FROM COLORADO. 



The limbs and feet of these skeletons are compare I on Plates 44, 47, 49, and the upper teeth of M. proparvulus 

 from another specimen on Plate 15, also feet, Plate 54. 



Skull one-half natural size. Teeth natural size. 



Pawnee Creek Middle to Up- Merychippus sejunctus, type skull, Am. Mus. 8291. 



per Miocene 



" " " 1. M. eoplacidus Osborn, type, Am. Mus. 9397. Teeth little worn. 



2. M. eohlpparion Osborn, type, Am. Mus. 9402. Teeth almost unworn, n)3 



not fully erupted. 



3. M. proparvulus Osborn, paratype, Am. Mus. 9398. Teeth about half worn. 



262 



