PLATE ClXa. 
OLIGOCENE PECCARIES AND ENTELODONTS 
Nomenclature 
Cope 1880-3 Revised 1915 
Elotherium ramosum Pelonax ramosus 
Elotherium imperator Entelodon imperator 
Thinohyus pristinus Perchcerus pristinus 
Fie. 1. Pelonax ramosus (Cope, 1874). Lower jaw, anterior view, one third natural size. Type 
specimen figured on PI. cix. 
Fig. 2, 2a, 2b. Entelodon imperator (Leidy, 1873). Anterior end of lower jaw, superior, in- 
ferior and anterior views, one-third natural size. Amer. Mus. No. 7381, Cope 
Coll. John Day formation; Camp Creek, John Day Valley, Oregon. 
Fies. 3-8. Boécherus humerosus Cope, 1879. Parts of type skeleton, figured on pl. cx. Fig. 3, 
fore foot, external; fig. 4, proximal view of metacarpus; fig. 6, 6a, proximal 
phalanx, proximal and distal views; fig. 7, 7a, second phalanx, same views; fig. 8, 
proximal view of tibia. All one-third natural size. 
Fic. 9, 9a. Percherus pristinus Leidy, 1873. Skull, lateral and palatal views, three-fifths 
natural size. Amer. Mus. No. 7394, Cope Coll., from the John Day formation 
of Oregon. 
