CANID^. 901 



M. 



Width between inner borders of postglenoitls 023 



Width between maxillary bones 030 



AVidth lietween orbits O'^O 



Widtli ofnaros 009 



Leiijttli of inferior molar series 041 



Linjith of bases of four jirenioiars 023 



Length of base of second i)reniolar 005 



Elevation ol crown of second premolar 005 



Length of base of fourth premolar 0072 



Elevation of crown of fourth premolar 00o5 



Length of base of sectorial 010 



Elevation of princi]>al cusp OOG 



Width of heel of sectorial '. OOli 



Diameter of lirst tubercular .^ '"'t''™!"'^*^""'- OO^ 



( transverse 005 



Anteroposterior diameter second tubercular 0037 



Length of base of superior sectorial 009 



Length of bases of two tubercnlars 012 



Length of base of lirst tubercular 0064 



The skull above described displays only two superior tubercular molars 

 on each side, and on this account I supposed the species to belong to the 

 genus Canis at the time I first described it. The second skull already men- 

 tioned, exhibits the characteristic number belonging to the genus Amphicyon. 

 A careful removal of the matrix from the extremities of the maxillary bones 

 of the specimen first described revealed the fact that they had been broken 

 off, since traces of the alveoli of the third superior molar were found. The 

 following characters are presented by the second skull which is the basis of 

 the supposed species cited in the synonymy above. 



The superior premolar teeth are rather short in anteroposterior diame- 

 ter, while the tubercular molars are relatively large There are no posterior 

 lobes on the former ; the internal and external cingula are well developed 

 in the first and second of the latter. The third tubercular is about as wide 

 as the second is long. The sagittal crest is only distinct on the posterior 

 part of the parietal region. Estimated length of skull, M. .110; lengtji 

 of superior molar series, .041 ; length of true molar series, 016; length of 

 first tubercular, .0075 ; length of second tubercular, .055 ; width of second 

 tubercular, .0074; length of third tubercular, .0036; width of third tuber- 

 cular, .052 : Length of sectorial widtli between anterior external angles of 

 first tubercnlars, .C30. 



