Hartline set career highs in receptions (43) and yards (615) this season and started in 11 games. He had been a favorite target of Miami quarterbacks in recent weeks, having one catch of at least 24 yards in six consecutive games before Sunday.
It was believed earlier in the week that Hartline could return before the end of the season, but the Dolphins ultimately opted to go in the other direction.
Epps, a rookie, spent time on the Dolphins' practice squad before being called up to the active roster. Originally a seventh-round selection (235th overall) in the 2010 draft by the San Diego Chargers, Epps attended the University of Miami, where he recorded 49 receptions for 634 yards and six touchdowns.