PLATE? GXXxill. 
M1ocENE PROBOSCIDEA 
Nomenclature 
Cope 1880-3 Revised 1915 
Mastodon campester Tetralophodon campester 
Mastodon sp. ? Trilophodon (= Gomphotherium) sp. 
Fic. 1. Tetralophodon campester (Cope, 1878). Inferior view of lower jaw of type specimen, 
Amer. Mus. No. 8527, figured on pll. CXX-CXXII. 
Fic. 2. ? T'rilophodon sp. Basicranial region, from below. Amer. Mus. No. 8520, Cope Coll. 
Republican River beds, Kansas. 
Fic. 3, 8a. ?Trilophodon sp. Scapula, external and proximal views. Amer. Mus. No. 8540, 
Cope Coll. Republican River beds, Decatur Co., Kansas. 
All figures one-fourth natural size. 
