HATCHER : OLIGOCENE CANID^ 69 



6 lumbars, 15 caudals, 5 sternals, a nearly complete set of ribs, left humerus, radius, 

 ulna and pyramidal, right humerus, radius, ulna and manus except the pyramidal, 

 both hind limbs and feet, and the patellse and os penis. 



No. 553, consisting of a skull without the lower jaw, much injured posteriorly 

 on the right side, with P. -, -, - and M. ~, - in excellent preservation. Associated 

 \vith this skull there were found a calcaneum, two caudals, and a few other frag- 

 ments. Both specimens are from the Oreodon beds on Bad Land Creek, Sioux 

 Co., Neb. Unless otherwise stated the following description will be based on 

 No. 492. 



The Skull, Pl. XIV., Figs. 1 and 3, Pl. XVI., Fig. 5. 



Seen from the side the skull of D. felinus is low, with the facial region much ab- 

 breviated and the fron to-parietal region somewhat elongated. The distance from 

 the anterior margin of the orbits to the extreme front of the premaxillaries is only 

 about one third the total length of the skull. 



Viewed from above the brain-case appears narrow and the zygomata widely ex- 

 panded. The maximum temporal constriction is a little in advance of the point 

 Avhere the superciliary ridges unite to form the high sagittal crest. The fronto- 

 maxillary region is broad but converges rapidly in front. There is a slight con- 

 striction posterior to the canines. 



The premaxillaries are small, with rather deep external lateral grooves for the 

 reception of the inferior canines. The incisive alveolar border is placed nearly at 

 right angles to the longer axis of the skull. Posteriorly the premaxillaries send 

 back slender processes which are intruded between the anterior portions of the max- 

 illaries and nasals, but are widely separated by those bones from the anterior projec- 

 tion of the frontal s. 



The nasals are rather broad anteriorly but narrowed posteriorly. They are 

 extended far back between the frontals. 



The maxillaries are very broad posteriorly but narrow anteriorly. They are in 

 contact with the nasals throughout about one half the length of the latter. They 

 are excluded from the anterior border of the orbits by the malars and lachrymals. 

 Inferiorly the maxillo-premaxillary suture bisects the alveolus of the canine. The 

 infraorbital foramen is large and is situated immediately above the anterior portion 

 of the superior sectorial and the posterior portion of P.-^-. The maxillaries are con- 

 tinued posteriorly to form the floor of the orbits and give support to the superior 

 molars. 



The malar forms much the larger portion of the anterior and inferior border of 

 the orbits and sends backward a rather long process which unites, by an extended 



