CONTENTS OF VOLUME II. xi 



CHAPTER XXIII. EXCRETORY ORGANS. Pp.561 609. 



Platyelminthes, pp. 561502. Mollusca, pp. 562563. Polyzoa, p. 563. 

 Brancbiopoda, p. 563. Chastopoda, pp. 563 566. Gephyrea, pp. 566 567. 

 Discophora, p. 567. Arthropoda, pp. 567 568. Nematoda, p. 568. Excretory 



organs and generative ducts of the Craniata, pp. 568607. General, pp. 



568569. Elasmobrauchii, pp. 569576. Cyclostoruata, pp. 577578. Teleostei, 

 pp. 578580. Ganoidei, pp. 580 582. Dipnoi, p. 582. Amphibia, pp. 582 588. 



Amniota, pp. 583599. General conclusions and summary, pp. 600607. 



Pronepbros, pp. 600 601. Mesonephros, pp. 601 603. Genital ducts, pp. 603 

 606. Metanepbros, pp. 606 607. Comparison of the excretory organs of the Chor- 

 data and Invertebrata, pp. 607608. Bibliography of Excretory organs, pp. 608 

 609. 



CHAPTER XXIV. GENERATIVE ORGANS AND GENITAL DUCTS. Pp. 610 619. 



Generative organs, PP. 610615. Porifera, p. 610. Coelenterata, pp. 610 

 611. Chffitopoda and Gephyrea, p. 612. Chastognatha, pp. 612 613. Polyzoa, 

 p. 613. Nematoda, p. 613. Insecta, p. 613. Crustacea, pp. 613614. Cbordata, 

 pp. 614 615. Bibliography of generative organs, pp. 615616. Genital ducts, 

 pp. 616619. 



CHAPTER XXV. THE ALIMENTARY CANAL AND ITS APPENDAGES, IN THE 



CHORDATA. Pp. 620643. 



Mesenteron, PP- 620636. Subnotocbordal rod, pp. 620622. Splanchnic, 

 mesoblast and mesentery, pp. 622 623. Eespiratory division of the Mesenteron, 

 pp. 623630. Thyroid body, pp. 624627. Thymus gland, p. 627. Swimming 

 bladder and lungs, pp. 627 630. The middle division of the Mesenteron, pp. 630 

 634. Cloaca, pp. 630631. Intestine, pp. 631632. Liver, pp. 632633. Pan- 

 creas, pp. 633 634. rostanal section of the Mesenteron, pp. 634 636. 



The stomodseum, pp. 636642. Comparative development of oral cavity, 

 pp. 638640. Teeth, pp. 640642. 



The proctodseum, PP- 642643. Bibliography of alimentary canal, p. 643. 



