INTESTINAL TRACT OF BIRDS. 

 Fig. 28. 



307 



Intestinal Tract of Neophron percnopferug. 

 1 . 2, 3, three anterior loops of Meckel's Tract. Other lettering as before. 



Fat.conid.t;. 



(1) GypaelitKP. — Gypohicra.r angolensis {1\^. 29) displays an alimentary tract extremely 

 like that of tlio true Vultures. The duodenum is simpler, being; a long, narrow loop. 

 Meckel's tract begins witli tliree distinct minor loojjs (1, 2, and 3) ; then follows an axial 

 loop, with ^Meckel's diverticulum, and the remaining part of the tract, including the 

 supra-c;ecal kiuks and the vestigial cieca, is precisely as in the Vultures. 



(2) Polybori)}(P. — Tji J'oJyhorm hrmilienals (fig. 30), the Brazilian Caracara, the 

 duodenum forms a long, narrow loop, which is wound into a spiral. Meckel's tract 

 consists of a set of small loojis arranged very symmetrically, the axial loop as usual 

 bearing a MeckeVs diverticulum. There is a well-formed but single supra-c;«cal kink in 

 the nornial position, and anterior to that a supra-duodenal loop. The caica are vestigial, 

 and the rectum is short and straight. 



(3) Accip'Urincp. — In Virnis cineraceun (fi<j. 31) is to be found what may be regarded as 

 a central condition lor the Falconidae. The duodenum is a large, very wide loop. 



32* 



