On the practice squad, the Dolphins lost offensive tackle Damion Cook, who was signed to the Baltimore Ravens active roster.
The Dolphins replaced with guard Dwayne Pierce, who now has been signed to the practice squad three different times.
On Tuesday, the Dolphins will bring in linebacker Brad Jackson and running back/kick returner David Allen.
Here's the skinny on the moves.
Harrison was with the team for a few weeks and simply didn't show the Dolphins that much. Dolphins vice president Rick Spielman said the team might bring back Harrison at some point, but it's obvious Harrison is not a guy who would be a difference-maker in the secondary.
Miranda started two games for Seattle last year after spending his rookie season with the Colts in 1999. He played his college ball at the University of Central Florida and will get a look as the Dolphins try to find another cornerback to work behind starters Sam Madison and Patrick Surtain and backup Jamar Fletcher.
As for the two guys being brought in on Tuesday, Jackson might be the more familiar. That's because he was a third-round pick of the Dolphins in 1997.
Jackson started six games for Baltimore last season, then signed with Carolina in the offseason before being released recently.
He's a smallish linebacker who has ability on special teams.
David Allen, meanwhile, doesn't have much of an NFL resume, but he was a simly sensational punt returner at Kansas State.