432 Thorpe — Some Tertiary Camivora in 



Expedition of 1873 travelled from North Platte to 

 Antelope Creek apparently withont making any recorded 

 collections. I am inclined to believe that whatever mate- 

 rial was collected during the course of this long traverse 

 was boxed at Antelope Creek, where the first collecting 

 camp was established, and shipped east. Hence material 

 from lower horizons came from the Antelope Creek camp, 

 but was collected somewhere between there and North 

 Platte (city), Nebraska. 



Measurements of Holotypes. 



N. multicuspis N. latidens 



mm. mm. 



M 1? ant.-post. diameter . . . 9.3 8 



M 1? ant.-post. diameter of heel 4 3.5 



M 2 , ant.-post. diameter 5.2 



Depth below middle of sectorial 12 10.5 



Nothocyon sp. 



Cat. No. 12791, Y. P. M. Lower Miocene, near Scott's Bluff, Nebraska. 



Both rami and part of a maxilla indicate a form of 

 Nothocyon which does not readily fall within any of the 

 known species. The length of the tooth-row is very close 

 to that of N. vulpinus, but the depth of ramus below the 

 alveolar parapet is nearly equal to that of Mesocyon 

 robustus, that is, the mandible is considerably heavier and 

 deeper than that of any other species of this genus. The 

 depth below M x is 16 mm., the same as shown in the figure 

 of M. robustus, although in the table of measurements 

 for that species the depth is given as 6 mm., which is 

 undoubtedly a typographical error. The anteropos- 

 terior diameter of M 2 is 1 mm. greater than that of N. 

 vulpinus. 



Harold Cook (1909) records a large form of Nothocyon 

 discovered near the Agate Spring quarries in lower Har- 

 rison beds. His specimen is "somewhat larger and 

 heavier than N. geismarianus Cope," and has a faint 

 cingulum encompassing the anterior part of the sectorial. 

 The Yale specimen also shows a slight cingulum in this 

 position. 



