PLATE I 



Described 

 on Page 



Fig. 1. Protoreodon medius Peterson. Lateral view of fragmen- 

 tary skull and jaw. HT. Cat. No. 2962 CM. (Photo- 

 graph from the Carnegie Museum.) 



Fig. 2. Protoreodon paradoxicus (Scott). Lateral view of skull 

 and jaw. HT. Cat. No. 1 1234 P.U.M. (After Scott, 

 1899.) 



Fig. 3. Protoreodon parvus Scott & Osborn. Lateral view of skull 

 and jaw. PT. Cat. No. 1 1535 P.U.M. (After Scott, 

 1899.) 



Fig. 4. Merycoidodon gracilis (Leidy). Lateral view of skull and 

 jaw. PLT. Cat. No. 136 U.S.N.M. (After Leidy, 

 1869.) 



Fig. 5. Same as Fig. 4. Right half, superior view. 



Fig. 6. Oreonetes anceps (Douglass). Lateral view of skull and 

 jaw. PTs. Cat. Nos. 1052 and 1118 CM. (After 

 Loomis, 1924.) 



Fig. 7. Oreonetes anceps (Douglass). Superior view of skull. PT. 

 Cat. No. 1052 CM. (After Loomis, 1924.) 



Fig. 8. Same as Fig. 7. Inferior view of skull. 



Fig. 9. Limnenetes platyceps Douglass. Superior view of skull. 

 GHT. Cat. No. 701 CM. (After Loomis, 1924.) 



Fig. 1 0. Same as Fig. 9. Inferior view of skull. 



Fig. 1 1. Same as Fig. 9. Lateral view of skull. 



Fig. 12. Merycoidodon affinis (Leidy). Superior view of portion of 

 skull. HT. Cat. No. 10680 A.N.S.P. (After Leidy, 

 1869.) 



Fig. 13. Eucrotaphus jacksoni Leidy. Superior view of cranium. 

 GHT Cat. No. 10678 A.N.S.P. (After Leidy, 1854.) 



Fig. 14. Same as Fig. 13. Lateral view. 



Fig. 15. Same as Fig. 13. Inferior view. 



One-half natural size 



33 



35 



31 



56 



43 



43 



44 



46 



61 



312 



