ID help please

[BeachComber7]

I researched the inserted fossil picture and cannot find a match on line. I am probably not using the correct terminology.
One part seems to be a vertebrae of some kind, then there is the bony growth on the outside that encompasses the circle. There is a hole where the outside encloses the circle item. This was found at the beach, probably in a meager shell pile. I thought initially a tooth, then a part of a drum fish and now, I have no idea!

Any thoughts as to what it can be?

 

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[old digger]

That looks like a fossil vertbrea. Cool find.

 

[Harry Pristis]

Do a search for 'Tilly bone' and you'll find a lot of information.

 

[ObsidianQueen]

That is a vertebra for sure

 

[mamabear]

Great find. & Harry you are amazing! How do you have so much info?

 

[BeachComber7]

Ahh turns out after doing some reading on line, they are supposedly very common here in Florida, but this is the first one I have found. It seems to be from the Miocene Epoch to Pleistocene period and since my other stuff is from Pleistocene, it must be the same. It is from a saltwater fish, an 'abnormality' in the bone growth. Thanks Harry!!