Two ex-library volumes of the original publication form the Sears Foundation for Marine Research, Yale University. Number I, Part One: Lancelets, Cyclostomes, Sharks. 576 pp., 1948. Number I, Part Two: Sawfishes, Guitarfishes, Skates and Rays. 588 pp., 1953. Limited to an edition of 2500 copies printed on 50 percent rag paper. Both volumes shaken and starting at inner hinges. Ichthyology.