J^o.l.] COPE ON MIOCENE FAUN^ OF OEEGON. 57 



above, and the nasal bones are wide, and are not emarginate above the 

 osseous nares, as in many recent Carnivora. Posteriorly, the superior 

 border of the brain-case descends, but the parietal bones maintain a 

 gently convex outline in their high sagittal crest. The supraoccipital 

 region is elevated, and projects posteriorly. 



Measurements. 



Specimen No. 1. 



M. 



Antero-posterior diameter of second superior premolar 0.010 



Antero-posterior diameter of third inferior premolar 0.013 



Width of base of third inferior premolar 0.0065 



Elevation of crown of third inferior premolar 0.010 



Diameter of inferior sectorial ^*'"^'^^^®''^*^ 0.010 



( antero-jDosterior 0.021 



Width of first tubercular q qqq 



Specimen 2io. 2. 



Total length of cranium , 170 



Width across zygomatic arches 0.114 



Least width behind orbits 0.024 



Depth of cranium with crest at otic bulla 0.070 



Vertical diameter of orbit 0.025 



Length from orbit to end of muzzle (axial) 0.040 



Interorbital width 0.043 



Width of muzzle above second premolar 0.018 



Length of superior molar series 0.051 



Length of fourth premolar 0.012 



Length of sectorial 0.016 



Length of first tubercular 0.008 



Width of first tubercular 0.015 



Width of second tubercular 0.0085 



The length of the skuU is about that of the Coyote, but it is much 

 more robust in all its proportions excepting the postorbital constriction. 



Discovered by Charles H. Sternberg in the Oregon White Eiver beds 

 of the John Day Eiver region. 



Enhydrocyon basilatus, sp, nov. 



This Carnivore is represented by a mandible Avith coossified rami, 

 which are broken off behind the sectorial teeth. The crowns of the 

 latter and but one incisor and one canine tooth remaiu. The premolars 

 and one canine are in good preservation. 



These portions indicate an animal of the same general character as 

 the Enliydroeyon sfenocephalus, but of larger and more robust propor- 

 tions, and characterized by many dental peculiarities. These will be at 

 once pointed out. The canine is directed ui) wards and a little outwards, 

 and possesses two obtuse ridges bounding the interior face. The third 

 incisor is compressed and truncate superiorly and distally. The first 

 (second) premolar is two-rooted, compressed, and trilobate. It consists 

 of a princii^al cutting edge little elevated, and a smaU accessory lobe 



