Broad-clawed Porcelain Crab - http://www.andycowley.info/shore-life/index.html
The Broad-clawed Porcelain Crab (Porcellana platycheles), is a species of porcelain crab. It may reach a size of 15 millimetres (0.59 in), and is found in the Eastern North Atlantic Ocean and Mediterranean Sea, where it feeds on carrion and other organic debris.
Broad-clawed Porcelain Crab - http://www.andycowley.info/shore-life/index.html