I was told that these three bones were theropod metatarsal bones. However one of these bones (the right hand side one) is not hollow. Does that indicate something other than a theropod?

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Hi Paul,
                I'll wait for one of the vertebrate palaeontologists to pile in with an positive ID but a spaces in a fossil bone can be filled up with sediment or mineral deposits, so the fact that the bone is hollow does not preclude it being from a theropod.

If you could post a photo of the suspect bone shot looking down on the cross-section that would help us understand more about the bone.

Best,
            Al

"Hope is a duty from which palaeontologists are exempt."
David Quammen