The ornamental design for a melonslicer, as shown and described.
FIG. 1 is a top orthogonal view of a melon slicer showing my new design.
FIG. 2 is a front orthogonal view of the melon slicer of FIG. 1; the rear orthogonal view of the melon slicer of FIG. 1 is the mirror image of FIG. 2.
FIG. 3 is a right side orthogonal view of the melon slicer of FIG. 1; the left side orthogonal view of the melon slicer of FIG. 1 is the mirror image of FIG. 3.
FIG. 4 is a bottom orthogonal view of the melon slicer of FIG. 1; and,
FIG. 5 is a right top perspective view of the melon slicer of FIG. 1.