98 



ON THE EXTINCT MAMMALIA OF 



The following are measurements of the inferior teeth of Oreodon gracilis. The 

 first series are taken from a lower jaw, previously indicated as specimen No. 11, and 

 exhibits the ordinary sizes. They correspond closely with those of the specimen No. 

 1, represented in figure 2, plate VI. Several specimens of rami of lower jaws, and 

 fragments of others with teeth, present very nearly the same sizes. The second series 

 of measurements are taken from two teeth in a small fragment of a lower jaw: 



Lower teeth of Oreodon gracilis. 



Length of molar series, 

 Length of true molar series, 

 Length of premolar series, 

 Antero-posterior diameter of last molar, . 

 Transverse " " '' 



Antero-postero diameter of second molar, 

 Transverse " " " 



Antero-posterior diameter of first molar, . 

 Transverse " " " 



Antero-posterior diameter of last pi'emolar. 

 Transverse " " " 



Antero-postero diameter of second premolar, 

 Transverse " " " 



Antero-posterior diameter first premolar, 

 Transverse " " " 



Antero-posterior diameter of crown of canine. 

 Transverse " " " 



