The ornamental design for a casket, as shown and described.
FIG. 1 is a perspective view of the casket showing my new invention, the portion shown in dashed lines are for purposes of showing the background and do not form part of my invention;
FIG. 2 is a left-side view thereof, the right-side view being a identical to the left-side view;
FIG. 3 is a front view thereof, the rear view being identical to the front view;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is an enlarged fragmented view taken along lines 6–6 of FIG. 1; and,
FIG. 7 is an enlarged fragmented view taken along lines 7–7 of FIG. 1.