Peterson : Miocene Beds of Nebraska and Wyoming. .'>:> 



tomeryx sternbergi from the John Da> beds of Oregon. The lower 

 jaw is more produced in front of the molar-premolar series than in 

 P. halli. The slenderness of the mandible recalls that of P. serus 

 Douglass, but P T and ^ are of less anteroposterior diameter in the 

 latter species. 



Nothocyon lemur ? Cope. 



The fragment of the mandible, No. 1286, is of the same depth as 

 that of the species from the John Day formation (see U. S. Geolog- 

 ical Survey of the Territories, Vol. III.,, 1884, PI. LXX., Fig. 7). 

 The carnassial tooth is of slightly greater antero-posterior diameter, 

 but the transverse diameter is the same as in N. lemur. The speci- 

 men, which was found in the upper Monroe Creek beds, probably 

 represents a later form than that of the John Day formation, but is 

 here provisionally referred to the latter pending the discovery of more 

 complete material. 



Measurements. 



mm. 



Antero-posterior diameter of carnassial tooth 9 



Antero-posterior diameter of heel of carnassial tooth 3 



Transverse diameter of heel of carnassial tooth 3 



Family Canid^e. 

 Gen. et sp. indet. 



Fig. 6 represents a fragmentary pair of lower jaws (No. 1603, 

 Carnegie Museum Catalogue of Vertebrate Fossils) with canine P T and 

 M T in position. The specimen apparently represents a new genus be- 

 longing to the family Canidce, but the incompleteness of the material 

 renders it untenable as a type, and I give only the figure and descrip- 

 tion for the guidance and assistance of the student. 



The mandible is deep and heavy. The symphysis is extended well 

 back and resembles that of HycEnodon. The inferior border of the 

 horizontal ramus is but little rounded antero-posteriorly. Opposite 

 M-2 the angle turns upward more rapidly, as is usual in the Canidae. 



The canine of the left jaw is complete, while that of the right is 

 represented only by the root. The roots of the two canines are quite 

 close together, giving but a small space for the incisors. The canine 

 has a high and pointed crown. The tooth is very robust, and there 

 is evidence of the existence of a vertical groove on the postero-ex- 

 ternal angle and a heavy rounded vertical ridge directed posteriorly. 

 The internal angle of the canine is restored with plaster. 



