PLATE CCAS 
MiocrENE PROBOSCIDEA. SKULL OF TETRALOPHODON 
Nomenclature 
Cope 1880-3 Revised 1915 
Mastodon campester Tetralophodon campester 
l'etralophodon campester (Cope, 1878). Palatal view of skull of type specimen, Amer. Mus. 
No. 8527, Cope Coll. From Republican River Bed of Sappa Creek, Rawlins 
Co., Kansas. One-half natural size. 
See also pll. CXXI, CX XII, CXXIII. 
Note on the Nomenclature of Tertiary Mastodons 
Gomphotherium Burmeister, 1837, appears to be the earliest available generic name for the four- 
tusked mastodons with three transverse crests on the intermediate teeth of 
which the type and best known species is G. angustidens (Cuv.) of the European 
Miocene. Trilophodon Falconer and Tetrabelodon Cope are based upon the 
same species but are of later date. Trilophodon is the name adopted at present 
for the publications of the American Museum. 
/etralophodon Warren, 1852, applies to the genera with four crests on the intermediate molars, 
Mastodon longirostris and arvernensis of Europe being the types. 
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