INTESTINAL TKACT OF BIRDS. 275 



EXPLANATION OF THE PLATES. 

 Plate 21. 



Kv()l\itioii of tlie Intestinal Tract in tlie Pelargo-Colyiiiboinorphinc Brigade. 

 [For Colymbimorphine read Colymbomorpliiiie.) 



Plate 22. 



Kvolntion of the Intestinal Tract in the Alcctoromorphine Legion. 



Plate 23. 



Involution of the Intestinal Tract in the Coraciomorpliine Legion. 

 [For Coracimorphine read Coraciomorpliine.) 



In these Plates the affinities of the conformations of the Intestinal Tracts and not of the birds are 

 indicated. The outline of the coils of the tract in the unfolded condition is given ; the line of attachment 

 of the mesentery to the body lies to the reader's right. The diverticulum is represented as a dai'k spot 

 on the l(>tt. The duodenuni lies towards the upper end of the Plates, the rectum towards the lower end. 

 \\n\\ the cu'ca, when present, as a pair of d-.irk lines. 



