Spinous

To me,it does not seem, that you could join two such pieces together like vertebrates. Also, the part, which should probably be the spinous process seems to be expanded in the end, like if there were joint...

See entire post

... of the anterior and posterior tubercle. I have no idea! That is why I thought I would see what others come up. The large bit in the middle the spinous process? The bone is obviously quite worn from tumbling in the ocean but if it is part of the spine it would also have been from something very ...

See entire post