•940 THE JOHN DAY FAUNA. 



Oligobunis crassivultus Cope. 



American Naturalist, 1881, p. 497, and 1882, p. 246, fig. 14. Icticijon crassivultus Cope. Proceedings 



Academy Philadelphia, 1879, p. 190. 



Plate LXIX ; fig. 1, 2. 



The specimen representing- this species is a skull with both mandibular 

 rami in place, and without the parietal and occipital regions. These parts 

 belonged to an animal of about the size of the American badger (Taxitlea 

 americana). 



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 interorbital region is some- 

 what cracked, but appears to have been nearly flat medially; laterally it 

 descends 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 premaxillaries. Their combined nareal border is con- 

 cave, and is without the notches of some forms. The foramen infraorbitale 

 exterius is of medium size, and issues above the interval between the sec- 

 torial 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 angular hook is 

 prominent and robust. The cond3'le 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 vertically 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 excep- 

 tion 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, and in a regular series. -The canines in both jaws 

 are quite robust, and those of the lower jaw are rather abruptly recurved. 

 The first premolar is small, and has a simple crown and single root. The 



