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This well known account of the fossil invertebrates differs from the preceding edition only in minor changes and additions to the bibliography. Following an introductory chapter that explains the manner of formation of fossils, the varying degrees of preservation of animals as fossils, the chemical nature of the fossil remains and the scientific and economic importance of fossils, a chapter is devoted to each invertebrate group that has furnished fossils, namely the protozoans, sponges, coelenterates, echinoderms, annelids, brachiopods, bryozoans, mollusks and arthropods. In each chapter the time honored custom is followed of giving a conventional account of the anatomy of living members, with special emphasis on skeletal structures, succeeded by a survey of the fossil members. The account of living forms thus takes considerable space; it is questionable whether this is really necessary in a paleontologic work. The fossil members receive first a general description, followed by a list of
Palæontology Invertebrate. JAMA. 1947;134(1):109. doi:10.1001/jama.1947.02880180111028