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. 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. 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. 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. Chaetopoda and Gephyrea, p. 743. Choetognatha, 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. 748753. 



CHAPTER XXV. THE ALIMENTARY CANAL AND ITS APPENDAGES IN 

 THE CHORDATA. Pp. 754 780. 



Mesenteron, pp. 754 774. Subnotochordal rod, pp. 754 756. Splanch- 

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

 teron, pp. 758 766. Thyroid body, pp. 759762. Thymus gland, pp. 762, 763. 

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

 teron, pp. 766 771. Cloaca, pp. 766, 767. Intestine, pp. 767, 768. Liver, 

 pp. 769, 770. Pancreas, pp. 770, 771. Postanal section of the Mesenteron, pp. 

 771774. 



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

 pp. 7747/6- Teeth, pp. 776 778. 



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



