1879.] NATURAL SCIENCES OF- PHILADELPHIA. 191 



Char, specif. The snout is short and robust, and the profile from 

 the parietal region is straight and descending. The premaxillary 

 border projects but little beyond the line of the extremity of the 

 nasal bones. The muzzle is slightly contracted in front of the 

 orbit and above the fundus of the canine alveoli. The latter cause a 

 swelling on the side. The infraorbital region is somewhat cracked, 

 but appears to have been nearly flat medially; laterally it de- 

 scends steeply to the supraorbital border. The orbit is not large, 

 and the zygomatic fossa is short. The nasal bones are narrowed 

 posteriorly, a little contracted medially, and expanded anteriorly, 

 their lateral portions being produced along the pre-maxillaries. 

 Their combined nasal border is concave, and is without the notches 

 of some forms. The foramen infraorbitale exterius is of medium 

 size, and issues above the interval between the sectorial tooth and 

 the one in advance of it. The mandibular ramus is quite robust, 

 and its inferior border is gently convex. The masseteric fossa is 

 bounded by elevated borders, especially inferiorly, and the angu- 

 lar hook is prominent and robust. The condyle is situated on the 

 horizontal line of the tubercular molar, or a little above the others, 

 and has a wide transverse extent, chiefly inwards. The coronoid 

 process is high and wide, and is turned backwards so as to verti- 

 cally overhang the condyle. Its anterior border is wide below, and 

 becomes horizontal above. 



The teeth partake of the robust character of the skull, with the 

 exception of the incisors. Of these the crowns of the external 

 are long and narrow, and the median small in the premaxillaries, 

 while those of the lower jaw are all small. The canines in both 

 jaws are quite robust, and those of the lower jaw are rather ab- 

 ruptly recurved. The first premolar is small, and has a simple 

 crown and single root. The crowns of the other premolars are wide 

 at the base, and form each a simple cone, with a short posterior 

 basal heel. The upper sectorial is relatively not long, but is robust, 

 and with thick blades. The internal heel is well developed, as in 

 Canis, while a cingulum represents an anterior lobe. The tuber- 

 cular molar is narrower in fore and aft diameter than in Temnocxjon 

 coryphaeus or Canis latrans, although it presents the same de- 

 tails. These are a wide obtuse external cingulum ; two external 

 tubercles; a median obtuse tubercle, and a wide internal cin- 

 gulum. The premolars of the lower jaw are similar to those of 

 the maxillary bone. The inferior sectorial is quite robust, and 



