city ▁of ▁new ▁material ▁available ▁after ▁his ▁ 1 8 4 8 ▁diagn osis . ▁This ▁package ▁spawn ed ▁Le id y ' s ▁interest ▁in ▁the ▁White ▁River ▁bad lands ▁and ▁its ▁fa una , ▁and ▁he ▁eventually ▁sent ▁collect ors ▁from ▁the ▁American ▁Museum ▁west ▁to ▁expand ▁his ▁collection . ▁Between ▁ 1 8 4 8 ▁and ▁ 1 8 5 3 , ▁cases ▁of ▁new ▁material ▁were ▁sh ipping ▁back ▁to ▁Le id y . ▁Mad den ingly , ▁only ▁three ▁more ▁Po eb ro ther ium ▁to oth ▁samples ▁were ▁among ▁the ▁remains ▁recovered . ▁ ▁Et ym ology ▁The ▁term ▁po eb ro ther ium ▁comes ▁from ▁ ▁( , ▁" gr ass - e ating ") ▁and ▁ ▁( , ▁" w ild ▁animal ; ▁animal ; ▁" be ast "), ▁in ▁Latin ised ▁form . ▁The ▁specific ▁ep ith et ▁is ▁the ▁Latin ised ▁name ▁of ▁a ▁person ▁or ▁place , ▁or ▁a ▁Latin ▁ad jective ▁den oting ▁a ▁post ulated ▁characteristic ▁of ▁the ▁species . ▁ ▁Species ▁Po eb ro ther ium ▁wil son i ▁can ▁be ▁translated ▁as ▁"[ Dr . ▁Thomas ] ▁Wilson ' s ▁grass - e ating ▁be ast ". ▁Po eb ro ther ium ▁ch ad ron ensis ▁can ▁be ▁translated ▁as ▁" gr ass - e ating ▁be ast ▁from ▁Ch ad ron ▁[ formation ] ". ▁Po eb ro ther ium ▁fran ki ▁can ▁be ▁translated ▁as ▁" Fran k ' s ▁grass - e ating ▁be ast