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A complete revision of the previous edition, eliminating the few errors, misprints and inconsistencies, and updating the data. Certain taxa, formerly referred to in brief, are treated here in greater detail (e.g., in the Protozoa, Hydrozoa, Cestoda and Nemertea, to mention a few). As in the first edition, all the drawings of this edition were made by the author, some with minor revisions.