Found a better name, that Friday thing was just too much pressure.
So here we have the gastropod Turitella. Turitella is a very handy gastropod. First under the right circumstances they align themsleves, telling you the direction the current they were living in was moving. (these don't seem to be aligned but there might be something subtle that would need to be pulled out using some advanced techniques.) Second they're frequently eaten by crabs which leaves a characteristic pattern of both successful and unsuccessful attacks that can be easily recognized. It's not often you know exactly what killed your critter but with these sometimes you can tell. Also note the internal mold in the lower left where the shell has filled with sediment and that sediment has turned to rock. These are often all that's left since the shell is very prone to dissolution.
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