[302] Ursprung d. Wirbelthiere.
CHAPTER X.
The Alimentary Canal.
The present Chapter completes the history of the primitive alimentary canal, whose formation has already been described. In order to economise space, no attempt has been made to give a full account of the alimentary canal and its appendages, but only those points have been dealt with which present any features of special interest.
The development of the following organs is described in order.
(1) The solid œsophagus.
(2) The postanal section of the alimentary tract.
(3) The cloaca and anus.
(4) The thyroid body.