Heart Urchin (Brissus latecarinatus) ミナミオオブンブク – size 20cm
A Heart Urchin test with some of the spines still attached. Heart urchins live buried in the sand. they are eaten by Helmit Shells and Rays. Kauai 2015
The other side of a Heart Urchin test. Live ones are rarely found since they live in the sand. The shells are very fragile and seldom make it back to land intact. If there is an extra hole about the same size as the openings above it was most likely eaten by a helmet shell. Kauai 2022