CONTENTS OF VOLUME II. xi 



CHAPTER XXIII. EXCRETORY ORGANS. Pp. 680 740. 



Platyelminthes, pp. 680, 681. Mollusca, pp. 681, 682. Polyzoa, pp. 682, 683. 

 Branchiopoda, p. 683. Chretopoda, pp. 683 686. Gephyrea, pp. 686, 687. 

 Discophora, pp. 687, 688. Arthropoda, pp.688, 689. Nematoda, p. 689. Excre- 

 tory organs and generative ducts of the Craniata, pp. 689737. 

 General, pp. 689, 690. Elasmobranchii, pp. 690 699. Cyclostomata, pp. 700, 

 701. Teleostei, pp. 701 704. 'Ganoidei, pp. 704707. Dipnoi, p. 707. 

 Amphibia, pp. 707713. Amniota, pp. 713727. General conclusions 

 and summary, pp. 728737. Pronephros, pp. 728, 729. Mesonephros, pp. 

 729 732. Genital ducts, pp. 732736. Metanephros, pp. 736, 737. Com- 

 parison of the excretory organs of the Chordata and Iwvertebrata, pp. 737, 738. 

 Bibliography of Excretory organs, pp. 738 740. 



CHAPTER XXIV. GENERATIVE ORGANS AND GENITAL DUCTS. Pp. 



741753. 



Generative organs, pp. 741748. Porifera, p. 741. Ccelenterata, pp. 

 741 743. Chretopoda and Gephyrea, p. 743. Chretognatha, pp. 743 745. 

 Polyzoa, p. 745. Nematoda, p. 745. Insecta, p. 745. Crustacea, pp. 745, 

 746. Chordata, pp. 746748. Bibliography of generative organs, p. 748. 

 Genital ducts, pp. 748753. 



CHAPTER XXV. THE ALIMENTARY CANAL AND ITS APPENDAGES IN 

 THE CHORDATA. Pp. 754 780. 



Mesenteron, pp. 754774. Subnotochordal rod, pp. 754756- Splanch- 

 nic mesoblast and mesentery, pp. 756 758. Respiratory division of the Mesen- 

 teron, pp. 758766. Thyroid body, pp. 759762. Thymus gland, pp. 762, 763. 

 Swimming bladder and lungs, pp. 763 766, The middle division of the Mesen- 

 teron, pp. 766771. Cloaca, pp. 766, 767. Intestine, pp. 767, 768. Liver, 

 pp. 769, 770. Pancreas, pp. 770, 771. Postanal sec/ion of the Mesenteron, pp. 



77' 774- 



The stomodseum, pp. 774 7/8. Comparative development of oral cavity, 

 pp. 774776. Teeth, pp. 776778. 



The prOCtodaeiim, pp. 778-780. Bibliography of alimentary canal, p. 780. 



