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

Pp. 754-780.

Mesenteron, pp. 754-774. Subnotochordal rod, pp. 754-756. Splanchnic mesoblast and mesentery, pp. 756-758. _Respiratory division of the Mesenteron_, pp. 758-766. Thyroid body, pp. 759-762. Thymus gland, pp. 762, 763. Swimming bladder and lungs, pp. 763-766, _The middle division of the Mesenteron_, 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. 771-774.

The stomodæum, pp. 774-778. Comparative development of oral cavity, pp. 774-776. Teeth, pp. 776-778.

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

EMBRYOLOGY.