PLATE -€XxiIL 
Mt1ocENE PROBOSCIDEA 
Nomenclature 
Cope 1880-3 Revised 1915 
Mastodon campester Tetralophodon campester 
Mastodon “ligoniferus”’ (unpub.) ? Tetralophodon sp. 
Fras. 1-2. Tetralophodon campester (Cope, 1878). Part of skull and lower jaw. Type speci- 
men, Amer. Mus. No. 8527, Cope Coll., from Republican River beds, Sappa 
Creek, KKansas. Fig. 1, side view of skull and jaw restored in outline; la, 1b, 
cross-sections of upper tusk; fig. 2, lower jaw, superior view. Specimen figured 
in pll. CXX, CXXI, CXXIII. 
Fics. 3-5. ? Tetralophodon sp. Lower jaw and femur, Amer. Mus. No. 8529, Republican River 
beds, Driftwood Creek, Hitchcock Co., Nebraska. Fig. 3, 3a, inferior and 
anterior views of lower jaw; fig. 5, 5a, external and distal views of femur. Speci- 
men figured on pl. CX XIV. 
All figures one-fourth natural size. 

