University of California
Ucmp: The Ophiuroidea
All about the Ophiuroidea. Includes a picture of the fossil along with the history.
Other
Schayer's Brittle Star
Nice, brief overview of brittle stars, their form, color, habitat and distribution. Has a good picture.
Other
Hawaii Coral Reef Network: Ophiuroidea, Brittle Stars
This page simply contains a picture of a spiny brittle star. A good example of this echinoderm.