THE 
AMERICAN GEOLOGIST 
Vql. XVII. MAY, 1896. No. 5. 
THE GENUS TEMNOCYON AND A NEW SPECIES 
THEREOF AND THE NEW GENUS HYPO- 
TEMNODON, FROM THE JOHN DAY 
MIOCENE OF OREGON. 
By John Eyerman, F. Z. S., F. G. S. A., Easton, Pa. 
(Plate XI.) 
The Princeton Scientific Expedition of 1889 confined its 
work to the John Day region of Oregon; this expedition be¬ 
ing one for the no mere purpose, solely, of collecting, but 
being formed upon a scientific basis, as is characteristic of 
these expeditions, it secured not only an enormous amount of 
material, including some complete skeletons, but also under¬ 
took a geological survey of the country traversed, and partic¬ 
ularly where the fossils were in situ , with the gratifying 
result of proving or disproving some heretofore debatable- 
points. This wild and almost impassable region, too, is all 
the more interesting as exhibiting the manifestations of vol¬ 
canic activity and the work of atmospheric erosion on a truly 
magnificent scale. The principal points at which the greater 
part of the work was accomplished were the Middle fork. Cot¬ 
tonwood creek, Rudio creek, the ‘-Big Basin” of the John. 
Day, Haystack valley and Bridge creek. 
The mammalian fauna of the John Day is represented by 
many genera of Rodentia, Carnivora, Perissodactyla and Ar- 
tiodactyla. Of the Canidse it is impossible to give even an 
approximate idea of the number of species so far obtained 
