▁mus cle ▁fib res ▁is ▁present , ▁probably ▁representing ▁the ▁un segment ed ▁Mus cul us ▁ca ud of emor alis ▁long us ▁of ▁the ▁tail ▁base , ▁the ▁main ▁ret ractor ▁mus cle ▁operating ▁on ▁the ▁th igh bone . ▁These ▁fib res ▁are ▁pol yg onal ▁in ▁cross - section ▁and ▁show ▁the ▁inter cell ular ▁spaces ▁also . ▁Below ▁some ▁tail ▁base ▁verte bra e ▁the ▁connect ive ▁lig aments ▁between ▁the ▁che v rons ▁are ▁present , ▁forming ▁the ▁lig m ament um ▁inter ha em ale , ▁but ▁also ▁some ▁small ▁mus cle ▁fib res ▁and ▁some ▁myster ious ▁h ollow ▁tub es ▁arranged ▁in ▁a ▁her ring bone ▁pattern ; ▁the ▁latter ▁perhaps ▁represent ▁the ▁my ose pta ▁of ▁the ▁my ot om es , ▁the ▁segments ▁of ▁the ▁Mus cul us ▁ili oca ud alis ▁or ▁the ▁Mus cul us ▁is chi oca ud alis . ▁ ▁Horn ▁she ath s ▁On ▁all ▁cla ws ▁preserved ▁in ▁the ▁foss il ▁— ▁those ▁of ▁the ▁feet ▁have ▁all ▁been ▁lost ▁— ▁horn ▁she ath s ▁are ▁visible . ▁These ▁have ▁a ▁dark er ▁colour ation ▁on ▁top ▁than ▁on ▁the ▁bottom ▁which ▁suggests ▁that ▁the ▁original ▁horn ▁material ▁is ▁still ▁present ▁— ▁but ▁this ▁has ▁not ▁yet ▁been ▁directly ▁tested ▁by ▁a ▁chemical ▁analysis ▁for ▁fear ▁of ▁dam aging ▁these ▁del icate ▁structures ▁that ▁were ▁seen ▁as ▁forming ▁an ▁essential ▁part ▁of ▁the ▁integrity ▁of ▁the ▁pre cious ▁spec imen . ▁The ▁horn ▁she ath s ▁of