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![A sand dollar or biscuit urchin expn6906.jpg A sand dollar or biscuit urchin](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_expn6906.jpg?itok=JlnDAb9t)
Description
A sand dollar or biscuit urchin. Is this a fossil or the test of an animal that was indigenous to this environment. Depth approximately 300 meters. Sanddollars and biscuit urchins are really extremely flattened sea urchins. (Image credit: NOAA/OAR/OER, 2016 Deepwater Exploration of the Marianas, Leg 1.)