1883. | On the Extinct Dogs of North America. 239 
Three American species certainly belong to Temnocyon. These 
differ in size, proportions and the forms of the superior tubercular 
molars. The largest, and type of the genus, the T. altigenis (Fig. 
3), is as large as a wolf. T. wadlovianus Cope, has a shorter and 
wider head. T. corypheus (Fig. 4) is as large as the coyote, and 
was very abundant during the John Day epochin Oregon, 7, 
josephi Cope, provisionally referred to this genus, is still smaller, 
and has a narrower muzzle and wider face. All the species differ 
from the true dogs in their shorter muzzle and longer and nar- 
E> 4.—Temnocyon corypheus Cope, more than one-half natural size. From 
my n Day epoch, Oregon. Original. From Report U. S. Geol. Survey Terrs., F. V. 
ee Vol. iv. The numbers indicate the premolars and molars. No. 4 is the 
tower brain-case, in these points resembling the civets. They 
some from the John Day epoch, and probably also the White 
River beds of Nebraska. 
Garecyxus Owen. 
This senus, which is abundantly represented by species and 
individuals, existed during the Upper Eocene (the Phosphorites), 
and Miocene epochs in Europe, and also during the White River, 
or Oligocene, in North America. As the structure of the feet of 
