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UINTA SELENODONTS 



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elongate aiitero-posteriorly than p^, and are inserted each by two roots ; they 

 have simple, compressed crowns, with trenchant edges and acute apices, and 

 are slightly convex on the outer side. P^ has small fore and hind basal cusps, 

 but these are not present on the others. The lower premolars of Poebrotherium 

 are in general like those the Uinta genus, but they are relatively much more 

 elongate and have distinct basal cusps. 



MEASUREMENTS. 



Upper dentition, length 



incisor series, length 

 premolar-molar series, length 

 premolar series, length 

 molar series, length 

 P-i, length 



P-2, " 



P-3, " 

 P-4, " 

 P-4, width 

 M-i, length 

 M-i, width 

 M-2, length 

 M-2, width 

 M-3, length 

 M-3, width 

 Lower dentition, length 



premolar-molar series, length 



premolar series, length 



molar series, length 



P-i, length 



P-2, " 



P-3. " 



P-4, " 



M-I, " 



M-2, " 



M-3, '■ 



.0085 



.009 



The molars require no very particular description. They are of the 

 ordinary selenodont pattern and increase in size posteriorly; the crowns, 

 though entirely brachyodont, are relatively quite high, and the outer crescents 



