1881.] ^"^"^ [Cope. 



was demonstrated when I accidentally broke away the anterior border of 

 one of the orbits. This displayed the two canals filled with matrix their en- 

 tire length. The anterior foramen externum is anterior to and above the 

 posterior, and both are above the first (third) premolar tooth. The 

 lachrymal foramen is above the space between that tooth and the canine. 

 The crown of the canine tooth is a cone with a very oblique base, and a 

 convex anterior face. The base rises behind, and the posterior face has on 

 the median line a low angular edge. The internal cone of the third (first) 

 premolar is not so prominent as that of the second, though large. The 

 external cusps of both premolars rise directly from the external base. They 

 are flattened cones, with anterior and posterior cutting edges. The 

 crowns are a little contracted at the middle, so as to be narrower than the 

 inner lobe of the tooth, which is narrower than the external portion. Both 

 premolars have delicate anterior, posterior and external cingula. The ex- 

 ternal cusps of the true molars rise directly from the external base, and 

 like those of the premolars, have a regularly lenticular section. At the 

 internal base of each one is a small intermediate tubercle, which is con- 

 nected by an angular ridge with the single internal cusps. There are 

 delicate anterior, posterior, and external cingula, but no internal. The 

 posterior cingulum shows a trace of enlargement at its inner part, which 

 is well marked on the second molar, but it is not as prominent as in many 

 Creodont genera. The posterior external cusp of the last true molar is 

 reduced in size. Taking the molars together, the first true molar is the 

 largest, and they diminish in size both anteriorly and posteriorly. The 

 third true molar is a little smaller than the first (third) premolar. Enamel 

 smooth. 



Measurements. M. 



Length of cranium to occipital prominence above par- 

 occipital process, and minus premaxillary bone. . .0280 



Total width at posterior border of orbit, below 0240 



Length of palate from front of canine tooth 0116 



"Width of palate and peunltimate molars 0125 



Length of superior molar series 0095 



" " true molars 0060 



^. „ „ . (anteroposterior 0018 



Diameters of crown of canine ] ,. , „„^q 



^vertical 0018 



... c anteroposterior 0020 



Diameters crown of P-m. in, ^^^^^^,,3, 0026 



Diameters crown of P-m. 



anteroposterior 0020 



transverse 0035 



^. ,, ., (anteroposterior 0032 



Diameters M. 11, ? , nnAn 



' ( transverse 0040 



Diameters M. 



anteroposterior 0016 



^ transverse 0028 



^. ^ , . ( anteroposterior 0110 



Diameters ot orbit ^ ,. 1 ,« j jx nnTo 



I vertical (? depressed) 0078 



Interorbital width (least) 0050 



PROC. AMER. PHILOS. SOC. XX. 111. T. PRINTED MARCH 13, 1882. 



