PLATE XII. 



Figures of horses' teeth from Goodnights; all natural size. 

 Figures 1-2. Superior molars of Protohippus lenticularis, Cope; in an early 



stage of wear: 2a. posterior side of figure 2. 

 Figures 3-4. Superior molar teeth of Hippidium interpolahim, Cope:, grinding 



faces; 3a, posterior view of figure 3. 

 Figures 5-6. Superior molar teeth of Hippidium Pspectans. Cope; grinding 



faces; figure 0. last molar; 6'a, same, anterior face of figure 6. 

 Figures 7-8. Equiis eurystylus, Cope; inferior molars of different individuals, 



grinding faces; 7a, 8a, interior faces; 76, 8b, exterior faces of crowns. 



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