The ornamental design for urn having a starfish shellshape, as shown and described.
FIG. 1 is a top perspective view of an urn having a starfish shell shape according to the present invention.
FIG. 2 is a bottom perspective view of an urn having a starfish shell shape according to the present invention, wherein an interior perimeter of the opening is reduced to broken lines, and the broken lines form no part of the claimed design.
FIG. 3 is a front elevation view of an urn having a starfish shell shape according to the present invention.
FIG. 4 is a rear elevation view of an urn having a starfish shell shape according to the present invention.
FIG. 5 is a right side elevation view of an urn having a starfish shell shape according to the present invention; and,
FIG. 6 is a left side perspective view of an urn having a starfish shell shape according to the present invention.