The ornamental design for an octopustowelrack, as shown and described.
FIG. 1 is a front elevational view of an octopus towel rack in accordance
with this design, it being understood that the rear elevational view is
the same but without eyes and eyebrows;
FIG. 2 is a right side elevational view thereof, it being understood that
the left side elevational view is a mirror image duplicate;