The tests (shells) of these sand dollars are round, flat and disc-like, typically measuring 3 inches (7.6 cm) in diameter.

This color occurs due to only the hard, calcified exoskeleton remaining, with further bleaching by sun and saltwater as it reaches the shore.

In terms of feeding, sand dollars are suspension feeders that rely on a specialized structure called Aristotle's Lantern.

Their cilia create grooves on the underside of their body that funnel food particles like plankton, detritus, and microscopic organisms toward their central mouth.

Sand dollars typically reproduce sexually through external fertilization, where eggs and sperm are released into the water column.