FIG. 1 is a side perspective view of my new lantern; FIG. 2 is a front elevation view thereof; FIG. 3 is a rear elevation view thereof; FIG. 4 is a left side elevation view thereof, FIG. 5 is a right side elevation view thereof; and, FIG. 6 is a top plan view thereof. The broken line showing is for illustrative purposes only and forms no part of the claimed design.