In addition to Eriksson, the Bruins are also acquiring forwards Matt Fraser, Reilly Smith and defenceman Joe Morrow in the deal announced Thursday. Dallas will receive Seguin, forward Rich Peverley and defenceman Ryan Button.
Seguin, chosen with the No. 2 pick by Boston in the 2010 draft, led the Bruins in scoring during the 2011-12 season. He was a member of the 2011 Stanley Cup championship team and was selected as an NHL All-Star in 2012.
Eriksson, a 2011 All-Star, had 29 points in 48 games for the Stars last season. He has a career plus-31 rating.