We claim the ornamental design for a cross trellis, as shown and described.
FIG. 1 is a perspective view of a cross trellis, showing my new design;
FIG. 2 is a front elevational view of the invention, the rear elevational view being a mirror image thereof;
FIG. 3 is a left-side elevational view of the invention, the right-side elevational view being a mirror image thereof;
FIG. 4 is a top plan view of the invention;
FIG. 5 is a bottom plan view of the invention; and,
FIG. 6 is a partial enlarged perspective view of the invention.
The broken lines showing a garden, flowers, and a sign card in FIG. 1, and the broken lines showing the sign card in FIG. 6, are included for the purpose of illustrating the invention in use, and form no part of the claimed design.