The ornamental design for roller buoy for storing rope connected to an underwaterarticle, as shown and described.
FIG. 1 is a side elevational view of a roller buoy for storing rope
connected to an underwater article showing our new design; and a view of
the side opposite being substantially a mirror image;
FIG. 2 is front elevational view thereof, the rear elevational view thereof
being substantially a mirror image; and
FIGS. 3 and 4 are respectively top and bottom plan views.