crab i.d.

Anyone know what kind of crabs these are? Lembeh Strait, Indonesia.

Thanks in advance.

It's a pebble crab, family Leucosiidae (also known as purse crabs which doesn't make as much sense). If photo ids on the web are correct this has been identified as Leucosia pubescens. The name was recently changed to Seulocia pubescens.

http://www.starfish.ch/c-invertebrates/true-crabs.html

Thanks!!