900 THE JOHN DAY FAUNA. 



foramen, bur a small mastoid is visible. The foramen magnum is large and is 

 subround through its extension interiorly ; its border is notched at the supe- 

 rior base of the condyle. The condylar foramen is small and is near the/ 

 lacerum posterius, but entirely distinct from it. The latter is subround and 

 rather large. There is no distinct/ carotideum visible. The/ lacerum ante- 

 rius is much contracted. The/ ovale is rather large and transverse, and the 

 / alisphenoidale posterius is small and distinct. Foramen postglenoidale rather 

 large. 



Dentition — The third premolar tooth in both jaws differs from the cor- 

 res^Donding one in the C. gregarius and in most recent species, in lacking the 

 lobe of the posterior cutting edge, agreeing in this (as regards the inferior 

 series) with the Temnocyon altigenis. It is present in the fourth inferior pre- 

 molar, which has besides, a low heel. The inferior sectorial tooth is char- 

 acterized by its great robustness ; the internal median tubercle is much 

 elevated, while the principal cusp is short. The heel is wide and basin- 

 shaped, with the inner border as much elevated as the outer. The first 

 tubercular molar is characterized by its width as compared with its length, 

 being nearly as wide transversely as fore and aft. It has two anterior cusps 

 followed by a basin with elevated borders simulating two posterior cusps. 

 There are an anterior and an exterior cingulum. The second tubercular is 

 a miniature of the first, differing in the more robust external posterior cusp, 

 and the absence of external basal cingulum. There are no complete cin- 

 gula on the external bases of the other inferior teeth. The second superior 

 tubercular is well developed, having two external tubercles. The anterior 

 inner cusp of the superior sectorial is distinct and acute, and thei'e is a 

 cingulum along the inner base of the crown. The exseited portion of the 

 canines is long, slender, and with an oval section narrowed behind. Tlie 

 enamel of all the molars is more or less rugose, a character which is only 

 foimd elsewhere among our extinct dogs in the G. geismarianus. 



Measurements. 



~ M. 



Length of cranium to iniou 10(> 



Lfugtli from pieinaxillary to condyles 101 



Length from premaxillarv to postglcnoid 075 



Length from inemaxillary to posterior border of second tubercular 041) 



Length to anterior border of orbit o:r. 



Wii'.th of occiput at superior border itf foramen maijiiitiu 02i 



