96 



MEMOIRS OF THE CARNEGIE MUSEUM 



Proamphicijun iiehrascermH. — Char. gen. I.l, C.-, P.-, M.-. Sagittal and occipital 

 crests very high and sharp. Premolars much reduced in size. Canines long, com- 

 pressed, elliptical in cross-section and with posterior cutting edge. 



Char. sp. Temporal constriction very marked and situated posterior to the 

 anterior extremity of the sagittal crest. Capacity of brain-case much reduced. 

 M.^ supported by two roots, its position more external than in Daphoeniis. Shear of 

 superior sectorial a little less oblique than in most other Oligocene canidse. Inter- 

 nal cone of sectorial reduced. P.-^, -, - much compressed and without even rudi- 

 mentar}^ posterior tubercles. Incisors very small. 



Detailed Description of Type (No. 491). 

 The type of the present genus and species consists of a skull without lower jaw 

 or other parts of the skeleton. It is complete save for the zygomata, the posterior 

 portion of the sagittal crest, and the basicranial region between the pterygoids and 

 the paroccipital processes. All the teeth are represented and in an excellent state 

 of preservation save M.-^ and I.- and the extreme point of the canine. The spec- 

 imen was found by Mr. O. A. Peterson, in the Oreodon beds, on Bad Land Creek, in 

 Sioux Co., Nebraska. 



Fig. 6. Side view of type of Proamphicyon nehrasccima Hatcher (No. 491). Natural size. 



The skull is long and compi'essed with the facial region somewhat less abbrevi- 

 ated than in Daphoenus. The capacity of the brain-case is rather less than in Da- 



