Burke Museum
Burke Museum: Marine Fossils
"Marine fossils and their living relatives" is part of a larger site dedicated to the research and collection information of the Burke Museum on Paleontology.
Indiana University
Indiana Univ. Bloomington: Geo Notes: Trilobites: Denizens of Ancient Seas [Pdf]
Presents some facts about trilobites, extinct arthropods from the Cambrian to Permian Periods.