LIST OF PLATES. 



I. Thalassochelys caret fa. See explanation, p. 14. 

 II. Chelone midas. See explanation, p. 14. 



III. Superior view of shell of Testudo inusitata Hay. 



IV. Inferior view of shell of Testudo inusitata Hay. 

 V. Superior view of shell of Testudo hollandi Hay. 



VI. Inferior view of shell of Testudo hollandi Hay. 

 VII. Superior view of shell of Testudo edce Hay. 

 VIII. Inferior view of shell of Testudo edce Hay. 

 IX. Group of skeletons representing three specimens of Promery- 



cochcsrus carrikeri Peterson. 

 X. Restoration of Promerycochcsrus carrikeri Peterson. 

 XI. Cranium of PromerycochcErus vantasselensis Peterson. 

 XII. Skull oi Stenomy 'his gracilis Peterson. 



XIII. Side view of skull of Diceratherium niobrarense Peterson. 



XIV. Palate view oi Diceratherium niobrarense Peterson. 



XV. Side view of skull and lower jaws and crown view of inferior 

 dentition of Diceratherium cooki Peterson. 

 XVI. Side view of skull and lower jaws of Dinohyus hollandi. 

 XVII. Palatal view of skull of Dinohyus hollandi Peterson. 

 XVIII. Skull of Amphicyon superbus Peterson. 

 XIX. Parahippus nebrascensis Peterson. 

 XX. Lonicera altissima Jennings. 

 XXI. Skull of Prono?notheriu7n laticeps Douglass. 

 XXII. Eucrotaphus dickinsonensis Douglass. 



XXIII. Eucrotaphus ?nontanus Douglass. 



XXIV. Skull of Merycoides cursor Douglass. 

 XXV. Mesoreodon (?) latidens Douglass. 



XXVI. Promerycochcerus hatcheri Douglass. 

 XXVII. Projnerycochcerus grandis Douglass. 

 XXVIII. Promerycochoerus hollandi Douglass. 

 XXIX. Ticholeptus breviceps Douglass. 

 XXX. Ticholeptus bannackensis Douglass. 

 XXXI. Dysichthys australe Eigenmann and Ward. 

 XXXII. Figs. 1-4. Pimelodella mucosa, Pimelodella gracilis, Ihering- 

 ichthys megalops. See explanation, p. 156. 



