Those of you w/ access to a library w/ Chelonian Conservation and Biology. Take a look at the plastral shot on p.69 in Mitchell and Rhodin's article in volume 2(1):66-72. The plastral pattern is the same and the slight serration at the outer edge of the femoral/anal seam is present.
:dark plastron with light margins, but a head shot would really help. any idea where it came from?
: ::This one is pretty tough. I just can't seem to place it. Can you post a head shot? As this may help a great deal for a positive ID. Do you know the answer?