THE PHANTOM MENACE finished first in last week's Memorial Day weekend USboxoffice race, taking in an estimated $64.8 million to bring its total to$204.8 million. Based on this, experts are now predicting that the filmwill eventually pass $400 million in North Amercian receipts. THE MUMMYfinished in third place, taking in $12.7 million, for a total of $117.1million. Newcomer THE THIRTEENTH FLOOR, an effects driven thriller aboutvirtual reality, finished fifth, taking in $4.3 million. THE MATRIXfinished sixth, taking in $3.1 million to bring its total to $154.1million.