Long before dinosaurs roamed the earth, there were trilobites--one of the most striking animals to populate prehistoric seas and whose fossils are favorites among collectors today. From the giant trilobites of Newfoundland to fascinating new specimens from Morocco, Levi-Setti's magnificent book brings these "butterflies of the sea" to life for everyone curious about our remote past This second edition features coverage of a greater variety of trilobites, an improved photographic atlas reorganized to present their evolutionary progression, and over 200 photographs.