XX 



ILLUSTRATIONS 



Plate Page 



XX. Pr ornery cochcerus thomsoni Loomis. Skull (PT) 351 



Promery cochcerus vantasselensis pygmceus Loomis. Skull (HT). 



XXI. Merycochoerus ma gnus Loomis. Skull and rami (HT) 353 



XXII. Merycochoerus proprius Leidy. Skull (PLT) 355 



XXIII. Merycochosrus proprius Leidy. Fragmentary skull and ramus (GHT) 357 



Merycochoerus matthewi Loomis. Skull (HT). 



XXIV. Pronomotherium laticeps (Douglass). Skull and rami (GHT) 359 



Pronomotherium elrod'i (Douglass). Mandibular fragment (HT). 



Pronomotherium madisonium (Douglass). Mandibular fragment (HT). 



XXV. Merycoides cursor Douglass. Skull and rami (GHT) 361 



XXVI. Merycotdes latidens (Douglass). Skull and rami (HT) 363 



XXVII. Poatrefhes paludicola Douglass. Skull (GHT) 365 



Ticholeptus bannackcnsis Douglass. Rami (HT). 



XXVIII. Ticholeptus rusticus (Leidy). Fragmentary skull and ramus (HT) 367 



Ticholeptus breviceps Douglass. Skull and ramus (HT). 



XXIX. Ticholeptus zy gomaticus Cope. Skull and ramus (GHT) 369 



Ticholeptus brachymel'is Douglass. Skull and ramus (HT). 

 Ticholeptus obliquid ens (Cope). Ramus (HT). 



XXX. Metoreodonfrojectus Matthew & Cook. Skull (PLT) 371 



XXXI. Metoreodon profectus Matthew & Cook. Ramus (HT) 373 



Metoreodon novomexicanus (Frick). Palate (CT). 

 Merycochoerus ccenopus Scott. Manus and pes (HT). 

 Merychyus elegans Leidy. Fragmentary skull and ramus (GCTs). 



XXXII. Merychyus arenarum Cope. Skull and rami (HT) 375 



Merychyus arenarum leptorhynchus Cope. Skull and rami (HT). 

 Merychyus delicatus Loomis. Skull and ramus (HT). 



XXXIII. Merychyus arenarum minimus Peterson. Skull and rami (HT) 377 



XXXIV. Merychyus curtus Loomis. Skull and ramus (HT) 379 



Merychyus elegans paniensis Loomis. Ramus (HT). 



Merychyus siouxensis Loomis. Skull (HT). 

 Merychyus pariogonus Cope. Skull (HT). 



XXXV. Leptauchenia decora Leidy. Fragmentary skull and ramus (GCT); skull (PLT) 381 



XXXVI. Leptauchenia nitida Leidy. Skull and ramus (HT and PLT) 383 



Leptauchenia minora Schlaikjer. Palate (HT). 

 Leptauchenia major Leidy . Fragmentary skull (CT). 



XXXVII. Cyclopidius calij ornicus Stock. Fragmentary skull and ramus (HT) 385 



Leptauchenia major Leidy. Skull and ramus (CT). 

 Phenacocoelus munroensis Peterson. Rami (HT). 

 Cyclopidius simus Cope. Ramus (PT). 

 Metoreodon major (Leidy). Maxilla (HT). 

 Metoreodon? medius (Leidy). Mandibular fragment (HT). 



