A survey of representative trilobite species from North America. It includes meticulous line drawings of 42 species, with information for each concerning classification, geologic range, and geographical distribution. Descriptions of probable life style, similar species, interesting features, etc. are also given.The 8 page, illustrated Introduction includes discussions of trilobite anatomy, growth, vision, lifestyles, locomotion, feeding, classification, and extinction. A brief "suggested reading" list is also offered.