The Pectoral girdle, pp. 599-606. Pisces, pp. 599-601. _Amphibia and Amniota_, pp. 601, 602. Lacertilia, p. 603. Chelonia, p. 603. Aves, pp. 603, 604. Mammalia, p. 604. Amphibia, p. 605. Bibliography of Pectoral girdle, pp. 605, 606. The Pelvic girdle, pp. 606-608. Pisces, pp. 606, 607. _Amphibia and Amniota_, pp. 606, 607. Amphibia, p. 607. Lacertilia, p. 607. Mammalia, p. 608. Bibliography of Pelvic girdle, p. 608. _Comparison of pectoral and pelvic girdles_, pp. 608, 609. Limbs, pp. 609-622. The piscine fin, pp. 609-618. The cheiropterygium, pp. 618-622. Bibliography of limbs, p. 622. CHAPTER XXI. THE BODY CAVITY, THE VASCULAR SYSTEM AND THE VASCULAR GLANDS. Pp. 623-666. The body cavity, pp. 623-632. General, pp. 623, 624. _Chordata_, pp. 624-632. Abdominal pores, pp. 626, 627. Pericardial cavities, pleural cavities and diaphragm, pp. 627-632. Bibliography of body cavity, p. 632. The vascular system, pp. 632-663. General, pp. 632, 633. The heart, pp. 633-643. Bibliography of the heart, p. 643. Arterial system, pp. 643-651. Bibliography of the arterial system, p. 651. Venous system, pp. 651-663. Bibliography of the venous system, p. 663. Lymphatic system and spleen, p. 664. Bibliography of spleen, p. 664. Suprarenal bodies, pp. 664-666. Bibliography of suprarenal bodies, p. 666. CHAPTER XXII. THE MUSCULAR SYSTEM. Pp. 667-679. Evolution of muscle-cells, pp. 667, 668. _Voluntary muscular system of the Chordata_, pp. 668-679. Muscular fibres, pp. 668, 669. Muscular system of the trunk and limbs, pp. 673-676. The somites and muscular system of the head, pp. 676-679. Bibliography of muscular system, p. 679. CHAPTER XXIII. EXCRETORY ORGANS. Pp. 680-740. Platyelminthes, pp. 680, 681. Mollusca, pp. 681, 682. Polyzoa, pp. 682, 683. Branchiopoda, p. 683. Chætopoda, pp. 683-686. Gephyrea, pp. 686, 687. Discophora, pp. 687, 688. Arthropoda, pp. 688, 689. Nematoda, p. 689. Excretory organs and generative ducts of the Craniata, pp. 689-737. General, pp. 689, 690. Elasmobranchii, pp. 690-699. Cyclostomata, pp. 700, 701. Teleostei, pp. 701-704. Ganoidei, pp. 704-707. Dipnoi, p. 707. Amphibia, pp. 707-713. Amniota, pp. 713-727. General conclusions and summary, pp. 728-737. Pronephros, pp. 728, 729. Mesonephros, pp. 729-732. Genital ducts, pp. 732-736. Metanephros, pp. 736, 737. _Comparison of the excretory organs of the Chordata and Invertebrata_, pp. 737, 738. Bibliography of Excretory organs, pp. 738-740. CHAPTER XXIV. GENERATIVE ORGANS AND GENITAL DUCTS. Pp. 741-753. Generative organs, pp. 741-748. Porifera, p. 741. Coelenterata, pp. 741-743. Chætopoda and Gephyrea, p. 743. Chætognatha, pp. 743-745. Polyzoa, p. 745 Nematoda, p. 745. Insecta, p. 745. Crustacea, pp. 745, 746. Chordata, pp. 746-748. Bibliography of generative organs, p. 748. Genital ducts, pp. 748-753. CHAPTER XXV. THE ALIMENTARY CANAL AND ITS APPENDAGES IN THE CHORDATA. Pp. 754-780.