▁Fair field ▁Os born , ▁who ▁was ▁a ▁strong ▁oppon ent ▁of ▁Marsh ▁and ▁his ▁tax a , ▁l abeled ▁the ▁A pat osa urus ▁mount ▁of ▁the ▁American ▁Museum ▁of ▁Natural ▁History ▁Br ont osa urus . ▁Because ▁of ▁this ▁decision ▁the ▁name ▁Br ont osa urus ▁was ▁commonly ▁used ▁outside ▁of ▁scientific ▁literature ▁for ▁what ▁R ig gs ▁considered ▁A pat osa urus , ▁and ▁the ▁museum ' s ▁popular ity ▁meant ▁that ▁Br ont osa urus ▁became ▁one ▁of ▁the ▁best ▁known ▁din osa urs , ▁even ▁though ▁it ▁was ▁invalid ▁throughout ▁nearly ▁all ▁of ▁the ▁ 2 0 th ▁and ▁early ▁ 2 1 st ▁centuries . ▁ ▁It ▁was ▁not ▁until ▁ 1 9 0 9 ▁that ▁an ▁A pat osa urus ▁sk ull ▁was ▁found ▁during ▁the ▁first ▁expedition , ▁led ▁by ▁Earl ▁Doug lass , ▁to ▁what ▁would ▁become ▁known ▁as ▁the ▁Car neg ie ▁Qu ar ry ▁at ▁Din osa ur ▁National ▁Monument . ▁The ▁sk ull ▁was ▁found ▁a ▁short ▁distance ▁from ▁a ▁ske leton ▁( spec imen ▁C M 3 0 1 8 ) ▁identified ▁as ▁the ▁new ▁species ▁A pat osa urus ▁l ou is ae , ▁named ▁after ▁Louise ▁Car neg ie , ▁wife ▁of ▁Andrew ▁Car neg ie , ▁who ▁fund ed ▁field ▁research ▁to ▁find ▁complete ▁din osa ur ▁ske let ons ▁in ▁the ▁American ▁West . ▁The ▁sk ull ▁was ▁designated ▁C M 1 1 1 6 2 ; ▁it ▁was ▁very ▁similar ▁to ▁the ▁sk ull ▁of