No. 2328. PLEISTOCENE VERTEBRATES IN UNITED STATES— HAY. 95 



second molars (Cat. No. 8993), with roots; and two hindermost mo- 

 lars, a right and a left, of individuals of somewhat different ages. 

 The length of each is close to 17 mm., the width 13.3 mm. 



Family PROCYONIDAE. 



PROCYON LOTOR (Linnaeus). 



This species is represented in the collection by a lower left second 

 molar (Cat. No. 8996). 



Family CANIDAE. 



AENOCYON AYERSI? Sellards. 



Plate 4, figs. 24-26. 



There are present in the collection some teeth (Cat. No. 8997) of 

 a large wolf which is referred with some doubt to this species. The 

 teeth are the upper third premolars, right and left ; the upper right 

 second premolar; the upper left first premolar; the lower right 

 second premolar, with the front root and part of the crown missing ; 

 the upper first and the lower left third incisors. The teeth are 

 practically unworn. The upper third premolars (pi. 4, figs. 24, 26) 

 are 17 mm. long, 7.6 mm. thick. In these measurements they agree 

 exactly with those of the type of A. ayersi. In a specimen of A. 

 diinis at hand a tooth having the same length has a thickness of 

 slightly less than 8 mm. The cingulum of the Whitesburg tooth is 

 more strongly developed than in the specimen of A. dims. 



The upper second premolar (pi. 4, fig. 25) is 16.2 mm. long and 



7.5 mm. thick, being thus as long as in J., dims., as reported by Sel- 

 lards, and longer than in the type of A. ayersi. In the A. dims 

 skull at hand the length is 14 mm. ; the thickness, 7.8 mm. This tooth 

 differs from the corresponding one of A. dims and that of Canis 

 nubilus in having the sharp anterior edge of the cusp continue 

 nearly straight forward to the cingulum, instead of curving strongly 

 inward to meet the latter. The first upper premolar resembles that 

 of Canis nuhilus, but is larger. The length of the crown is 8.4 mm. : 

 the thickness, 6 mm. The lower second premolar has a thickness of 



6.6 mm. The rear portion is furnished externally and internally 

 with a pretty strong cingulum. Behind the cusp there is a tubercle 

 about as large as in the third premolar. From the latter it differs 

 in being lower and thinner. 



The upper third incisor resembles that of Ca7iis nuhihis, but it is 

 larger. The greatest width of the crown is 8 mm. ; the thickness of 

 the base, fore and aft, is 7.5 mm. ; the upper second incisor measures 

 7 mm. across the accessory cusps. 



