908 THE JOHN DAY FAUNA. 



in Canis latrans, and its posterior foramen small. The/ ovale is farther 

 removed from the / alisphenoidale than in the coyote, and is exterior to and 

 a httle behind the/ carotidemn. 



The nasal bones extend to above the middles of the orbits, and con- 

 tract gradually to their apex. Their combined anterior border is a regular 

 concave, and the lateral angles at this point are produced outwards and for- 

 wards. The posterior apex of the premaxillary bone is separated from the 

 anterior apex of the frontal by a short space. The maxillo-malar suture is 

 deeply notched in front below, and it extends upwards to above the infra- 

 orbital foramen. A very narrow surface of the lachrymal is exposed on the 

 external surface. The pterygoid bone is distinct, and is nearly equally 

 bounded by the sphenoid and palatine on the outer side. The inferior 

 suture of the orbito-sphenoid runs in a groove, which is deepest anteriorly. 



Dentition. — The crowns of all the incisor teeth are narrow or com- 

 pressed, and, though slightly worn, present no indication of notch. As 

 usual, the external ones are much the largest in anteroposterior diameter. 

 The canines have robust fangs and rapidly tapering crowns, which are but 

 little compressed. The first superior premolar is one-rooted, and the crown 

 is simple. The crown of the second is without posterior heel and tubercle, 

 while the third possesses both. The sectorial is relatively short, less so 

 than in C. latrans. The blades are low and obtuse as compared with recent 

 species, and the notch separating them is quite open. The anterior external 

 heel is small, and there is no anterior external tubercle. The first tubercu- 

 lar molar is large, and the crown is narrower than that of C. latrans. It 

 has an obtuse external cingulum, two external conical cusps, a V-shaped 

 median ridge, and a wide internal cingulum. This crown difiers frohi the 

 corresponding one of C. latrans in having conical instead of compressed 

 external cusps, and a simple V-shaped crest within instead of two adjacent 

 cusps. The second tubercular is smaller than in C. latrans, and its tuber- 

 cles are less distinct. There are two outer tubercles, a V-shaped ridge, 

 and an inner cingulum, all very obscure. The enamel of all these teeth is 

 smooth. 



