6 



University of California Publications. 



[Geology 



molars of the living coyotes of this region, and M 2 is relatively a 

 little larger. 



Fig. 1. Canis sp. No. 545. Maseall beds (?), Kattlesnake Creek, near 

 Cottonwood, Wheeler County, Oregon. X 1. 



The outer cusps of M 1 are laterally compressed and rather 

 sharp. The protocone is well developed, but the inner cusp of 

 the cingulum is relatively small. The intermediate tubercles are 

 both present. The outer ridge of the cingulum is well defined, 

 but is narrow. 



On M 2 the metacone is about as large as the paracone. The 

 V-shaped protocone is distinct and the inner cusp or hypocone is 

 well developed. 



MEASUREMENTS. 



mm. 



M 1 , greatest antero-posterior diameter 9.7 



M 1 , greatest transverse diameter 13.3 



M 2 , greatest antero-posterior diameter 6.6 



M 2 , greatest transverse diameter 9.8 



The only known specimen, No. 545, was obtained between 

 Cottonwood Creek and Birch Creek, in the southeast corner of 

 Wheeler County, Oregon. (Locality No. 887, Univ. Calif. Coll. 

 Vert. Palae.) At this locality the Maseall formation is capped 

 by the Rattlesnake beds. This specimen Avas obtained on an ex- 

 posure of Maseall beds immediately below a Rattlesnake outcrop. 

 It was not in the matrix, and we cannot be absolutely certain 

 that it had not originally come from the Rattlesnake beds above. 



Tephrocyon, New Genus. 



TEPHROCYON RURESTRIS Condon. 



PI. 1, Figs. 1, 2, and 3. 



Canis rurestris Condon, The Two Islands, 1902, p. 139, PI. 18. Type 

 specimen No. 382, private collection of Professor Thomas Condon. 



This species is represented by a very fine skull obtained by 

 Professor Thomas Condon many years ago in the Maseall forma- 

 tion near Cottonwood, Grant County, Oregon. It was figured by 



