Hackled Orb Weaver ( Philoponella congregabilis)

A small spider hanging in a tangled web of nearly invisible silk looking very much like a piece of debris. When disturbed its legs shot out exposing a humped abdomen with small tubercles. The spider was a mottled grey,brown and white perfectly mimicking a small piece of dried leaf or dirt.
Interesting information about this family of spiders:
http://www.cirrusimage.com/Arachnid_featherlegged_orbweaver.htm