Found on the beach in Çanakkale, Turkey.
I have found a lot of these, but this is the first one that has parts like long teeth. My other findings have sometimes 4, sometimes 6 tubes. Very solid, stone-like objects. Is this from a marine animal or is it a non-living formation, I wonder.
Below image is for scale in centimeters.
View from top and bottom
Other similar findings without teeth-like parts