PLATE 16 



UPPER TEETH OF MERYCHIPPUS FROM NORTHEASTERN COLORADO. 

 COMPARISON OF UPPER TEETH OF U. SEJUNCTUS AND if. PANIENSIS. 



All figures natural size. 



Pawnee Creek, northeastern Col. Middle Miocene 1. Merychippus sejunctus Cope, referred specimen, Am. M us. 8254 



(reversed in drawing). Teeth little worn. 



" " " " " " 2. M. sejunctus Cope, referred specimen, Am. Mus. 9414 (m 3 re- 



versed in drawing). Teeth moderately worn. 



" " " " " " 3. M. sejunctus Cope, type, Am. Mus. 8291, Teeth much worn. 



" " " " " " 4. M. paniensis Cope, referred specimen, Am. Mus. 9460 (m 2-3 



reversed in drawing). Teeth little worn. 



" " " " " " 5. M. paniensis Cope, referred specimen, Am. Mus. 9093. Teeth 



moderately worn. 



" " " " " 6. M. paniensis Cope, referred specimen, Am. Mus. 9039 (reversed 



in drawing). Teeth much worn. 



254 



