XV111 



ILLUSTRATIONS 



Figure Page 



141. Skull of Ticholeftus fetersoni (HT) 193 



142. Skull of Ticholeftus rusticus (PLT) 195 



143. Superior view of skull of Ticholeftus rusticus (PLT) 195 



144. Fragmentary skull and jaw of Ticholeftus smithi (HT) 198 



145. Skull of Poatrefhes faludicola (GHT) 201 



146. Inferior view of skull of Metoreodon calijortiicus (HT) 203 



147. Superior molars of Metoreodon calijortiicus (HT) 204 



148. Inferior dentition and ramus of Metoreodon comfressidens (HT) 205 



149. Fragmentary skull of Metoreodon novomexicanus (CT) 207 



150. Ramus of Metoreodon novomexicanus (CT) 208 



151. Superior view of ramus of Metoreodon novomexicanus (CT) 208 



152. Ramus of Metoreodon frofectus (HT) 210 



153. Superior dentition of Metoreodon frofectus (PLT) 211 



154. Ramus and dentition of Metoreodon relictus (GHT) 212 



155. Skull of Oreodontoides oregonensis (GHT) 214 



156. Right half, inferior view of skull of Oreodontoides oregonensis (GHT) 214 



157. Right half, superior view of skull of Oreodontoides oregonensis (GHT) 214 



158. Superior view of right ramus of Oreodontoides oregonensis (PLT) 215 



159. Fragmentary ramus of Oreodontoides oregonensis (PLT) 215 



160. Skull and jaw of Merychyus arenarum (HT) 218 



161. Skull and jaw of Merychyus arenarum minimus (HT) 220 



162. Skull and jaw of Merychyus curtus (HT) 223 



163. Superior and inferior dentition of Merychyus curtus (HT) 223 



164. Skull and jaw of Merychyus delicatus (HT) 225 



165. Ramus of Merychyus elegans faniensis (HT) 227 



166. Skull of Merychyus harrisonensis (HT) 229 



167. Superior view of skull of Merychyus harrisonensis (HT) 229 



168. Inferior view of skull of Merychyus harrisonensis (HT) 230 



169. Skull of Merychyus siouxensis (HT) 233 



170. Superior dentition of Cyclofidius densus (HT) 244 



171. Inferior dentition of Cyclofidius densus (HT) 244 



172. Manus of Cyclofidius densus (HT) 245 



173. Skull and jaw of Cyclofidius lullianiis (HT) 247 



174. Right half, superior view of skull of Cyclofidius lullianus (HT) 247 



175. Muzzle of Cyclofidius lullianus (HT) 247 



176. Right half, inferior view of skull of Cyclofidius lullianus (HT) 248 



177. Inferior dentition of Cyclofidius lullianus (HT) 248 



178. Fragmentary ramus of Cyclofidius brevijacies (HT) 251 



179. Superior view of ramus of Cyclofidius brevijacies (HT) 25 1 



180. Superior view of skull of Cyclofidius emydinus (HT) 253 



181. Skull of Cyclofidius emydinus (HT) 253 



182. Inferior view of skull of Cyclofidius emydinus (HT) 254 



183. Skull of Cyclofidius (Chelonocefhalus) schucherti (HT) 256 



184. Superior view of skull of Cyclofidius (Chelonocefhalus') schucherti (HT) 257 



185. Left half, inferior view of skull of Cyclofidius {Chelonocefhalus) schucherti (HT) 257 



186. Endocranial cast of Eforeodon socialis 263 



187. Endocranial cast and anterior sinuses of Merycochosrus 266 



188. Endocranial and sinus paranasales cast of Merycochosrus 269 



