>>/96739/
I haven't seen this before but I also assume it's a regular pressfit bb. The protruding cup looks like it may be something like a reduction shell from bb30 to 24mm? In any case I assume it still works like a normal pressfit so you take the chisel-like tool that brother bert posted  >>/96743/ and put it in one side and hit it with a mallet until that halve of the bb flies out