EXPLANATION OF PLATE XXIII. 



All the figures of the natural size except Fig. 16, which is one-half size. 



Figs. 1, 2. Pal^eosyops major : 



Fig. 1. The complete series of molar teeth of the left side of the lower jaw, except the first 



premolar. The second and third premolars are reversed from those of the opposite side. 



Specimen discovered by Dr. Carter in Dry Creek Cafion, forty miles from Fort Bridger. 

 Fig. 2. A series consisting of the molars and last two premolars contained in detached 



fragments of a lower jaw. Specimens obtained by Dr. Carter on Dry Creek. The molars 



are larger and more worn than in the preceding specimen. 



Figs. 3-6. Pal^osyops paltjdosus. Specimens upon which the species was originally established. 

 Hayden's collection of 1870. 

 Fig. 3. A third lower premolar of the left side. 

 Fig. 4. A last lower premolar of the right side. 

 Fig. 5. A first lower molar of the left side. 

 Fig- 6. Anterior part of a second upper molar of the left side. 



Figs. 7-11. Pal^osyops major. Specimens found by Dr. Corson in Dry Creek Cation. 

 Fig. 7. The left upper canine tooth. 

 Fig. 8. The second upper premolar of the left side. 

 Fig. 9. The last upper premolar of the same side. 

 Fig. 10. The second upper molar of the same side. 

 Fig. 11. The last upper molar of the same side. 



Fig. 12. PALiEOSYOPS MAJOR : 



Series of premolars from the second to the last, inclusive, of the right side. From Dry 

 Creek. Dr. Carter. 



Fig. 13. Paueosyops (Limnohytjs) laticeps(?) 



A second upper molar of the right side. A comparatively smooth tooth. Specimen discov- 

 ered by Dr. Corson, in association with the large canine tooth of Figs. 1-3, Plate XXV. 



Figs. 14-16. Pal^osyops major: 



Fig. 14. A last lower molar of the right side. Contained in a jaw fragment obtained by 



Dr. Carter at Dry Creek Canon. 

 Fig. 15. An inferior incisor, lateral view, belonging to the same individual as the specimens 



of Figs. 7-11. 

 Fig. 16. Upper view of a cranium, one-half the natural size. The specimen discovered by 



Dr. Carter at Dry Creek Canon. 



