Living sand dollars have small spines covering its entire body. They are softer and much shorter than those of the sea urchin. Like all echinoderms, sand dollars have tube feet. They are not used to move around, but simply to breathe. The sand dollar's tube feet actually stick out of the top of the sand dollar. On a sand dollar test, there is usually a pattern that looks like the petals of a flower. That pattern is made up of many tiny holes, and it is through these holes that the sand dollar's tube feet came out when it was alive.