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Abstract

Recent advances in our knowledge of the lower vertebrates are extremely striking, and result from more widespread and active geological exploration, from greatly improved possibilities of collecting, from very great advances in methods of clearing the rock from the fossils, and from increasingly deep studies on comparative anatomy and histology. Earlier classifications have had to be revised, and in some respects more may be known of details of anatomy of fossil fishes than can be found in the literature on recent forms. This review of progress is also a pointer to further desirable work.