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Gasteracantha fornicata
Belly of a spider I found in the back yard.
Have never seen anything like it before! I will get more photos of other side as it has yellow strips on it & horn like things that stick out its side.
This may be a useful search page for you: http://www.findaspider.org.au/find/spide...
Nice find - this is one of the spiny orbweavers. I think it might be Gasteracantha fornicata