Fig. 4. Video sequence and schematic of fluorescent dye relative to the tentacles of Aurelia aurita during a swimming cycle. (A) The dye placed along the exumbrella. (B) The bell expanding and drawing the dye through the tentacles toward the subumbrellar cavity as part of the stopping vortex. (C,D) The bell contracting and expelling the dye along the tentacles as part of the starting vortex.