The ornamental design for a christmastreeornament, as shown and described
.
FIG. 1 is a front elevational view of a Christmas tree ornament showing my
new design, the ornament being approximately symmetrical about the two
vertical planes, the horizontal plane bisecting it, and two planes forming
an angle of approximately 60° with the vertical axis and the rear
being identical; and,
FIG. 2 is a top plan view thereof, the bottom being essentially identical,
with valleys in pace of the ridges and ridges in place of the valleys.