▁Thomas ▁Le id y . ▁With ▁the ▁support ▁of ▁his ▁ste pm other , ▁and ▁after ▁over coming ▁the ▁opposition ▁of ▁his ▁father ▁( who ▁wanted ▁him ▁to ▁be ▁a ▁sign ▁painter ), ▁Le id y ▁studied ▁medicine ▁at ▁the ▁University ▁of ▁Pennsylvania . ▁He ▁graduated ▁with ▁his ▁medical ▁degree ▁in ▁ 1 8 4 4 . ▁ ▁He ▁married ▁Anna ▁H arden , ▁a ▁woman ▁who ▁took ▁a ▁serious ▁interest ▁in ▁his ▁work ▁and ▁helped ▁him ▁with ▁it ▁on ▁occasion . ▁Their ▁marriage ▁was ▁child less , ▁and ▁they ▁eventually ▁adopted ▁an ▁or phan ed ▁seven - year - old ▁girl , ▁Al win ia , ▁daughter ▁of ▁the ▁late ▁Professor ▁Fran ks ▁of ▁the ▁University ▁of ▁Pennsylvania . ▁ ▁Pale ont ology ▁Le id y ▁named ▁the ▁hol ot ype ▁spec imen ▁of ▁Had ros aur us ▁f oul ki i , ▁which ▁was ▁recovered ▁from ▁the ▁mar l ▁p its ▁of ▁H add on field , ▁New ▁Jersey . ▁It ▁was ▁notable ▁for ▁being ▁the ▁first ▁nearly - complete ▁foss il ized ▁ske leton ▁of ▁a ▁din osa ur ▁ever ▁recovered . ▁The ▁spec imen ▁was ▁originally ▁discovered ▁by ▁William ▁Parker ▁F oul ke . ▁Le id y ▁concluded , ▁contrary ▁to ▁the ▁view ▁prev ail ing ▁at ▁the ▁time , ▁that ▁this ▁din osa ur ▁could ▁adopt ▁a ▁b ip ed al ▁post ure . ▁He ▁also ▁described ▁the ▁hol ot ype ▁spec im ens ▁of ▁Ar ct od us ▁( A . ▁sim us ), ▁the ▁dire ▁w