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. Choctopoda, pp. 683 686. Gephyrea, pp. 686, 687. 

 Discophora, pp.687, 688. Arthropocla, 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. 707 713. Amniota, pp. 713 727. General conclusions 

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

 729732. Genital ducts, pp. 732736. Metanephros, pp. 736, 737. Com- 

 parison 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. 



741753- 



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

 741 743. Chtetopoda and Gephyrea, p. 743. Chastognatha, 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. 754780. 



Mesenteron, pp. 754774- Subnotochordal rod, pp. 7S475 6 - Splanch- 

 nic mesoblast and mesentery, pp. 756758. Respiratory division of the Mesen- 

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

 Swimming bladder and lungs, pp. 763766, 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. Posjtanal section of the Mesenteron, pp. 

 771774. 



The stomodseum, pp. 774 778. Comparative development of oral cavity, 

 PP- 774776. Teeth, pp. 776778. 



The proctodseum, pp. 778 780. Bibliography of alimentary canal, p. 780. 



