1 ▁illustr ation ▁of ▁the ▁sk ull . ▁The ▁sk ull ▁also ▁included ▁forward - point ing ▁nas al ss omething ▁unusual ▁for ▁any ▁din osa ur and ▁fen estra e ▁differ ing ▁from ▁both ▁the ▁drawing ▁and ▁other ▁sk ull s . ▁ ▁No ▁A pat osa urus ▁sk ull ▁was ▁mentioned ▁in ▁literature ▁until ▁the ▁ 1 9 7 0 s ▁when ▁John ▁St anton ▁Mc Int osh ▁and ▁David ▁B erman ▁red es cribed ▁the ▁sk ull s ▁of ▁Di pl od ocus ▁and ▁A pat osa urus . ▁They ▁found ▁that ▁though ▁he ▁never ▁published ▁his ▁opinion , ▁Holland ▁was ▁almost ▁certainly ▁correct , ▁that ▁A pat osa urus ▁had ▁a ▁Di pl od ocus - like ▁sk ull . ▁According ▁to ▁them , ▁many ▁sk ull s ▁long ▁thought ▁to ▁per tain ▁to ▁Di pl od ocus ▁might ▁instead ▁be ▁those ▁of ▁A pat osa urus . ▁They ▁re ass igned ▁multiple ▁sk ull s ▁to ▁A pat osa urus ▁based ▁on ▁associated ▁and ▁closely ▁associated ▁verte bra e . ▁Even ▁though ▁they ▁supported ▁Holland , ▁it ▁was ▁noted ▁that ▁A pat osa urus ▁might ▁have ▁possessed ▁a ▁Cam ar as aur us - like ▁sk ull , ▁based ▁on ▁a ▁dis art ic ulated ▁Cam ar as aur us - like ▁to oth ▁found ▁at ▁the ▁precise ▁site ▁where ▁an ▁A pat osa urus ▁spec imen ▁was ▁found ▁years ▁before . ▁On ▁October 2 0 , ▁ 1 9 7 9 , ▁after ▁the ▁publications ▁by ▁Mc