PETERSON : NEW CARNIVORES FROM MIOCENE OF WESTERN NEBRASKA Zin 
Lower jaw.—The mandible is quite similar to that of Canis lupus in its general 
characters, but may better be compared with such a form as Lycaon on account of its 
broader symphysis and condyles. The alveolar border is, however, more completely 
taken up by the premolars in the latter form than in the fossil. There are two 
mental foramina: one directly below Py and the other below P3. The inferior 
border of the horizontal ramus is less curved fore-and-aft than in Daphenus, while 
the line of the alveolar border is about the same. ‘Fhe temporal fossa is broad and 
deep, the coronoid process large and the process of the angle very robust and more 
inflected than in Daphwnus or the recent forms. 
Aside from the large pit, which lodged a considerable sized tympanohyal in the 
skull, the hyoid arch is not known in Daphenodon superbus. 
MEASUREMENTS OF SKULL AND JAWS. . 
Mm. 
253 
Greatest length of skull 
Distance from occipital condyle to incisors. 
Distance from occipital condyle to M* spake, 
Distance from M® to and including the incisors 
Greatest transverse diameter of the skull. 
Transverse diameter of occipital condyle .. 
Greatest transverse diameter of the brain Case.........+--+-+++++ 58 
Transverse diameter of the frontals at postorbital processe: 68 
Transverse diameter of muzzle at canine. 51 
Greatest length of mandible. , 182 
Height of mandible at coronoid process. 82 
Dentition.—The dentition (I$ C+ P4 M3) of Daphenodon superbus is completely 
preserved. ‘The first and second upper incisors are laterally compressed and 
resemble those of Daphawnus more than those of recent forms. I*, however, displays 
a rapid approach to the characters found in Canis, 7. ¢., it has attained a much larger 
size and a more nearly caniniform structure. The tooth ([4) isisolated by diastemata ; 
the one in front being quite short, while the one behind is equal to the greatest 
transverse diameter of the tooth. Asa whole the incisors are proportionally some- 
what larger than those of Daphanus felinus and I® is distinctly further advanced 
toward conditions found in Canis. As has been stated elsewhere, the canine, 
though quite robust, is not so large, nor of the shape seen in Amphicyon giganteus of 
Europe, to which genus it was wrongly referred. In the present genus the tooth is 
of moderately large size, oval in cross-section and recurved quite as in Canis occi- 
dentalis, though somewhat less compressed than in that species. The base of the 
tooth and the fang are rounder, which causes a greater swelling on the side of the 
muzzle than is seen in the latter form. 
The molar-premolar teeth have rather blunt cusps. P+ is single-rooted and 
