It looks as though there are two spiders here but there are only eight legs!
Has a female spider eaten her mate - legs first?? Unlikely - surely the body is the juiciest part? (*shudders* I can't believe I'm saying this!) In any case, males are smaller than females.
Has the spider sloughed off its skin? That seems possible but there are still only eight legs!
We enlarged the photograph to try and see more detail but it wasn't clear enough to make a judgement.
Has anyone any idea what has been happening?
I believe I am gradually overcoming my arachnophobia - hurray! This is a very common phobia affecting 50% of women and 10% of men.