164 



Annals of the Carnegie Museum. 



robiistuni.'''' 1 knew that the name had been given by Leidy to an 

 individual belonging to O. culbertsoni, but considered the name still 

 available. I propose for it the specific name macnvhinus. 



The skull is not much if any longer than that of O. culhcrtsoui 

 Leidy, but is very much heavier, and I think the differences are not 



Fig. 8. Oreodon macrorhinus (No. 767), White River beds, near Toston, Mont. 

 One half natural size. 



sexual. As seen from the side the muzzle tapers very little. The 

 enamel on the premolar teeth is wrinkled. 



The nodular beds from which this was taken undoubtedly corre- 

 spond with the "Oreodon beds" of the plains region. 



Upper Oligocene ? 



CARNIVORA. 



Mesocyon? Drummondanus sp. nov. 



No. 792. Figs. 9 and 10. 



Of this dog there is the scapula, some fragments of other parts of 



the skeleton, and a skull lacking the mandible. It was found about 



three or four miles east of Drummond, near the Hellgate River. 



As the lower teeth are not present it cannot be certainly referred tO' 

 its proper genus. The species, however, is different from any I have 

 seen. I cannot better define it than by showing how it differs from 

 Mesocyon coryphceus Cope, and Cyiwdesmi/s thooidcs Scott. 



Compared with M. cojyplimis it is somewhat smaller, not so much 

 restricted behind the orbit ; the sagittal crest is not so elevated ; the 



