▁were ▁mounted ; ▁in ▁their ▁opinion ▁this ▁was ▁clear ▁evidence ▁of ▁a ▁basic ▁bel t - like ▁rad ula ▁assembly ▁with ▁regularly ▁spac ed ▁to oth - rows , ▁a ▁feature ▁unique ▁to ▁m oll us cs . ▁On ▁the ▁other ▁hand , ▁they ▁wrote , ▁e unic id ▁pol ych a etes ' ▁j aws ▁have ▁only ▁the ▁v agu est ▁similarity ▁to ▁rad ula e , ▁and ▁other ▁ann el ids ' ▁j aws ▁grow ▁continu ously ▁without ▁replacement ; ▁and ▁they ▁supported ▁this ▁with ▁a ▁point - by - point ▁comparison ▁of ▁Od ont og ri ph us ’ ▁feed ing ▁appar atus ▁with ▁that ▁of ▁the ▁dor ville id ▁pol ych a etes ▁which ▁But ter field ▁claimed ▁it ▁res emble d . ▁In ▁answer ▁to ▁But ter field ' s ▁claim ▁that ▁the ▁resp ir atory ▁org ans ▁round ▁the ▁foot ▁could ▁not ▁be ▁m oll us can ▁c ten idia ▁because ▁these ▁mainly ▁cell ular ▁structures ▁would ▁not ▁have ▁foss il ized ▁in ▁the ▁Burg ess ▁Sh ale ▁conditions , ▁they ▁wrote ▁that : ▁fairly ▁soft ▁cell ular ▁t issue ▁belonging ▁to ▁the ▁st om ach ▁is ▁foss il ized ▁in ▁many ▁Od ont og ri ph us ▁spec im ens ; ▁some ▁m oll us can ▁g ills ▁are ▁st iff ened ▁by ▁non - cell ular ▁material , ▁for ▁example ▁in ▁pol yp lac op hor ans . ▁They ▁pointed ▁out ▁that ▁the ▁wr ink les ▁that ▁appear ▁across ▁the ▁body ▁in ▁views ▁from ▁the