NIMEAVID^. 981 



about half way above the base, and a very Httle inside of the line of the 

 edge of the heel. Its base is a little longer than that of the other specimen. 

 The penultimate deciduous molar has equal anterior and posterior basal 

 cutting lobes The median cusp is higher than the length of its own base. 

 The last deciduous tooth is a sectorial; its anterior lobe alone remains. 

 The entire crown of the superior canine was found with this lower jaw 

 (see fig. 15 a 6). Its crown is quite short and compressed, and both edges 

 are denticulate. It is probable that it is the temporary canine. It is much 

 shorter than the permanent canine of any North American species. 



3Ieasiirements. 



M. 



LeQgtli of base of deciduous penultimate molar 010 



Elevation of cusp C07 



Elevation of anterior cusp of last deciduous molar 007 



Length of permanent sectorial 018 



Length of base of crown of superior canine OH 



Elevation of crown of superior canine 025 



The adult jaw above described differs from that oiD.felina in the con- 

 siderably shorter tooth-line, as well as in the single-rooted first premolar. 

 As compared with Leidy's figures, it is shorter than one of them by the 

 length of the tubercular tooth ; and shorter than the other by the length of 

 that tooth plus the heel of the sectorial. 



Both specimens were found by myself in the beds of the White River 

 formation at a single locality in Northeastern Colorado. With them wei'e 

 associated a multitude of jaws and bones of Marsupialia, Carnivora, Bo- 

 dentia, Ungulata, Reptilia, etc. 



POGOXODON Cope. 



American Naturalist, 1S."?0, p. 143, (publishod January 31). 



3 1 3 1 



Dental formula: I.-; C. -; Pm. -; M. -. Inferior border of mandib- 

 o 1 3 1 



ular ramus flared downwards in front; lateral and anterior faces of ramus 

 separated by a pronounced angle. Superior canine compressed, with ante- 

 rior and posterior cutting edges. Superior sectorial without anterior basal 

 lobe; inferior sectorial with a heel. No tubercular molar. No lobes on 

 the edges of the crowns of the premolars. Incisors with conic crowns. 

 Postglenoid and postparietal foramina present. 



