▁feet ▁and ▁that ▁a ▁rect oc opro da e al ▁val ve ▁separated ▁fa ec es ▁and ▁ur ine . ▁ ▁Between ▁the ▁front ▁edge ▁of ▁the ▁pub ic ▁sh aft s ▁and ▁the ▁back ▁of ▁the ▁int est ines ▁a ▁large ▁empty ▁space ▁is ▁present . ▁Also , ▁the ▁rect um ▁seems ▁to ▁run ▁in ▁a ▁very ▁high ▁position ▁as ▁if ▁it ▁were ▁forced ▁up wards ▁by ▁something . ▁According ▁to ▁Dal ▁S asso ▁& ▁Mag anu co , ▁in ▁life ▁this ▁space ▁would ▁have ▁been ▁filled ▁by ▁the ▁y olk ▁sac ▁of ▁the ▁h atch ling ; ▁on ▁h atch ing ▁the ▁ju ven iles ▁of ▁re pt iles ▁typically ▁have ▁not ▁absor bed ▁all ▁the ▁y olk ▁and ▁use ▁the ▁resid ual ▁nut ri ents ▁to ▁supp lement ▁the ▁food ▁int ake ▁during ▁their ▁first ▁weeks . ▁ ▁Mus cle ▁t issue ▁At ▁several ▁places ▁on ▁the ▁foss il ▁mus cle ▁t issue ▁is ▁present . ▁The ▁degree ▁of ▁pres ervation ▁is ▁often ▁exception al , ▁with ▁not ▁only ▁the ▁individual ▁fib res ▁still ▁disc ern ible ▁but ▁also ▁the ▁individual ▁cells ▁and ▁even ▁the ▁sub cell ular ▁sar com eres . ▁Among ▁din osa ur ▁foss ils ▁such ▁sar com eres ▁are ▁only ▁known ▁from ▁Sant an ar apt or , ▁whose ▁mus cle ▁fib res ▁are ▁four ▁times ▁as ▁thick . ▁The ▁original ▁organ ic ▁material ▁has ▁been ▁replaced ▁by ▁small ▁h ollow ▁glob es , ▁the ▁walls ▁of ▁which ▁consist ▁of ▁eu hed ric ▁cry st als