Crab ID

Does anyone know what species of crab this is?

Photograph was taken on Steve's Bommie, Ribbon Reef #3, GBR. The crab is on a Millepora sp. hydrocoral.

My hosting site is playing up (AGAIN! ) so here it is again on a different host.

Possibly an Oncinopus. Something similar - long thin legs, triangular body with long rostrum & a covering of sponges - is called Oncinopus sp A in Tsuyoshi & Junji.

Thanks Leslie.