I can't identify it from this picture. It would appear to be a Chorisquilla, but I doubt that it is C. tweedei.
Can you tell me what color and pattern the eyes are?
Is the telson surface covered with spines that look like velcro?
Do you know if the rock it was in was from Fiji or Indonesia?
I suspect that it could be C. trigibbosa. If so, there are no adults of this species in museum collections and I would very mucy like to see it photographed and preserved.
Roy