Confidence: I'm as sure as I can be.
Notes: It's a mature male Julidae - see gonopods protruding about 7 leg pairs from head. It has about 30 body segments - therefore it can only be Brachyiulus (which means 'short Julus'). Brown body colour and very slight telson (bum) projection also support this id. There should be a pair of pale stripes down its back (otherwise only seen in the Ommatoiulus sabulosus - which looks very different), but these are out of view in this image. (btw - this one is not the introduced B.lusitanus - protruding gonopods are a different shape).