Cretaceous Marine Vertebra

[val horn]

found a large 4cm by 2 cm by 2 cm vertebra in a maryland marine cretaceous formation.    I am guessing the vertebrae is a batomorpha ,all other opinions are welcome.  two other odd pieces of bone were found adjacent to it.  I dont know if they are actually associated or what they might represent.  help will be greatly appreciated.

[Rockwood]

I agree it looks like calcified cartilage, and the oval shape does fit it being a ray.