24 



University of California Publications. 



[Geology 



postorbital processes, but is convex immediately behind these 

 points in specimen 1549. The postorbital processes are very- 

 short and blunt. The nasal region is characterized by the short- 

 ness of the nasal hones, which do not reach back to a line drawn 

 between the anterior borders of the orbits. They are consider- 

 ably shorter than in Dapkaenus or in M&socyon. 



The zyogamatic arch is not especially robust. The postgle- 

 noid process is long and acute. The paroccipital process is 

 shorter and less acute than in ferox, and is not directed down- 

 ward as much as in that species. 



The anterior and posterior palatine foramina are small. The 

 anterior border of the posterior nares is situated considerably 

 behind the last molars. The nasal chamber is narrow and the 

 inferior borders of the lateral walls are arched inward, giving it 

 a more nearly tubular form than is seen in Canis. The lach- 

 rymal and optic foramina, and the sphenoidal fissure have much 

 the same relations as in Canis. The optic foramen, the sphe- 

 noidal fissure, and the foramen rotundum are in a distinct groove 

 separated from the region above by a sharp ridge. The foramen 

 rotundum is very close to the sphenoidal fissure in the recessed 

 posterior end of this depression. The posterior opening of the 

 alisphenoid canal is almost hidden inside the foramen ovale. The 

 postglenoid foramen is nearer the median line of the skull than 

 is the lowest part of the postglenoid process. The relations of 

 the condylar foramen are much as in Canis. The foramen lace- 

 rum posterius seems relatively small. The postparietal foramina 

 are situated at about half the height of the brain case. 



The arrangement of many of the foramina, particularly the 

 postglenoid and the posterior opening of the alisphenoid canal, is 

 much like that in Daphaenus felina as described by Hatcher. 13 



Dentition. — The generic characters of the dentition of Temno- 

 cyon have already been fully discussed by Cope, 14 Schlosser, 15 

 Scott, 10 Eyerman, 17 Wortman and Matthew. 18 The observations 



13 J. B. Hatcher. Oligocene Canidae., Mem. Carnegie Mus., Vol. 1, No. 2, 

 p. 75. 



14 Sope, E. D. Tert, Vert., p. 902. 



15 Schlosser, M. Beitr. z. Pal. Oestr-Ung., B. 4, p. 280. 



16 Scott, W. B. Trans. Am. Phil. Soc, Vol. 17, p. 73. 



17 Eyerman, J. Amer. Nat., Vol. 17, p. 268. 



13 Wortman and Matthew. Bull. Am. Mus. Nat. Hist., Vol. 12, p. 115. 



