The ornamental design for memorial urn, as shown and described.
FIG. 1 is an isometric view of the memorial urn of the present invention;
FIG. 2 is a front view of the memorial urn of FIG. 1;
FIG. 3 is a rear view of the memorial urn of FIG. 1;
FIG. 4 is a left side view of the memorial urn of FIG. 1;
FIG. 5 is a top view of the memorial urn of FIG. 1;
FIG. 6 is a bottom view of the memorial urn of FIG. 1;
FIG. 7 is a right side view of the memorial urn of FIG. 1;
FIG. 8 is an isometric view of a second embodiment of the memorial urn of the present invention in which a broken line image and surrounding solid line border indicating a slightly recessed panel have been added on the back panel;
FIG. 9 is an isometric view of third embodiment of the memorial urn of the present invention in which a broken line image and surrounding solid line border indicating a slightly recessed panel have been added to the side wall; and,
FIG. 10 is an isometric view of fourth embodiment of the memorial urn of the present invention in which a broken line image and surrounding solid line border indicating a slightly recessed panel have been added on the front wall.
The broken lines are for purposes of illustrating portions of the design that form no part of the claimed design.