List of Figures in Text. 



Nothocyon annectens. Side view of upper and lower jaws. 



" " Superior and inferior dentition 



Merychyus minimus Peterson. Right side of skull . 

 ^Elurocyon brevifacies Peterson. View of right side of skull 



54 

 55 

 67 

 69 

 70 



" " " Palate view of skull 



" " " Fragment of pelvis ; head of femur 



metapodials . 



Tooth of Rodent 



Bone belonging to Mosasaurus lemonnieri Dollo. Three views : the 

 convex surface, concave surface and view showing curvature of 

 the bone . . . . . . . . . . .164 



Two views of sections across bone of Mosasaurus lemonnieri . .165 



Bone belonging to Clidastes tortor Cope . . . . . . 1 66 



Raphistoma stamineum Hall. An enlargement of the upper surface . 181 

 Scalites angulatus. Top and side views . . . . . .184 



" " Outline drawing ...... 185 



Bucania sulcatina. An enlargement of the portion of the surface . 196 

 Maclurites magnus Lesueur. A natural section of the operculum . 200 

 Diagrammatic section of cave at Frankstown, Pennsylvania . . 229 



Eryops. Dorsal vertebra, left side . . . . . . -235 



Rib 236 



" Anterior view of dorsal spine of caudal vertebra. . . 236 



Tooth of Desmatodon hollandi . . . . . . . .236 



Teeth of various Diadectids ........ 237 



Chevron bone of a Diadectid ........ 237 



Naosaurus raymondi. Part of the dorsal spine. .... 238 



Ilium of an undetermined reptile. External view .... 239 



Aphelops montanus. Femur . . . . . . . .257 



' ' ceratorhinus. Calcaneum of type ..... 260 



Outline of back of skull . . . .261 



" " Basi-occipital view of skull. . . .261 



" " Lateral view of back of skull . . . 262 



Aphelops sp. ? Humerus ........ 263 



Teleoceras ? sp. ? Lateral and superior views of fragment of skull . 264 

 Glyptosaurus montanus. Top view of skull ..... 278 



" " Side view of skull ..... 279 



Rhineura hatcheri. Side view of skull ...... 283 



" " Top view of skull ...... 284 



" " Palatal view of skull. ..... 284 



Peltosaurus granulosus. Top view of part of skull . ■ . 284 



" Side view of part of skull .... 285 



" Portion of a mandible .... 285 



