EXPLANATION OF PLATE II. 



Fig. 1. LOPHIODON OREGOXENSIS : 



Two upper molar teeth, much worn and seen on theii- triturating surfaces. Specimen from 

 Bridge Creek, Oregon. Natural size. 



Fig. 2. Megacekops coloradensis : 



Side view of the same specimen as that of figures 2, 3, of Plato I. One-half the natural size. 



Figs. 3, 4. Elotherium superhuji : 



Fig. 3. Portion of a lower canine tooth, natural size. From Bridge Creek, Oregon. 

 Fig . 4. Crown of an anterior premolar, natural size. From John Day's River, Oregon. 



Fig. 5. A^■c•HrrIIERIUM Condoni : 



A mutilated upper molar tooth, natural size. From Oregon. 



Figs. 6,7. Rhinoceros pacificus: 



Fig. 6. An upper molar seen on the triturating surface, natural size. From Alkali Flats, 



Oregon. 

 Fig. 7. An upper last premolar, seen on the triturating surface, natural size. From Alkali 



Flats, Oregon. 



Figs. 8,9. Rhinoceros hesperius(?) : 



Fig. 8. An upper last molar, seen on the triturating surface, natural size. From the Condon 



collection of Oregon. 

 Fig. 9. An inferior molar, seen on the triturating surface. 



Fig. 10. Patriofelis ulta: 



Portion of the right ramus of the lower jaw, half the natural size. It contains the remains 

 of five teeth behind the position of the canine. From near Fort BriJger, Wyoming. See 

 page 114. 



Figs. 11, 12. Hyrachyus agrarius : 



Fig. 11. Left ramus of the lower jaw, one-half the natural size. Specimen obtained by 

 Professor Hayden on Smith's Fork of Green River, Wyoming. 



Fig. 12. Portion of the left ramus of the lower jaw of a young animal, natur.il size. It con- 

 tains the temporary series of teeth behind which the first of the true molars is inclosed 

 within the jaw. From Black's Fork of Green River. Hayden's collection. 



Fig. 13. Hyrachyus modestus : 



A first or second upper molar of the left side, slightly larger than natural. From Smith's 

 Fork of Green River. Hayden's collection. 



Fig. 14. Hyraohy'US nanus : 



Portion of left ramus of the lower jaw, with two premolars and the three molars, natural 

 size. Obtained by Dr. Joseph K. Corson from Grizzly Buttes. 



Fig. 15. Diseased calcaneura (hyperostosis) of Merycochcerus uusticus. From Sweetwater River. 

 Hayden's collection of 1H70. 



Fig. IG. Oreodon superbus : 



Portion of right ramus of lower jaw, with the three premolars and first molar; natural size. 

 Condon collection of Oregon fossils. 



