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This is a rare listing. The specimen has multiples or two different species of trilobites.. This specimen has one complete Elrathia, two other nearly complete Elrathia, at least 6 complete Peronopsis, and many more partial and pieces of both trilobite species.. The Peronopsis are 2/8 to 3/8 inches. The largest Elrathia is 3/4 inch. The small nearly complete ones are 1/2 and 1/4 inch. . The entire specimen is 9 by 3 1/4 inches. It comes from the Middle Cambrian period. This item comes from Millard County Utah. The trilobite was one of the most abundant life forms of the Cambrian period, dating back over 500 million years. Trilobite's were ocean floor dwelling arthropods.