Couple of bones for ID?

[IndianRiverSonrise]

I found these on a central Florida beach. Many of the fossils I've seen there are black.

These are a different color. I think they may be from the same animal, if they are indeed bone. They are fossilized, but I don't have any idea what they are. What do you think? There are other turtle and mammal fossils in the area.

Thanks