208 



DR. P. CHALMERS MITCHELL ON THE 



Meckel's tract exhibits first three distinct minor loops, and then is prolonged axially, 

 bearing at its extremity a Meckel's diverticulum. The posterior part of the tract has one 

 or two minor loops and a large supra-duodenal loop with two " bridging " veins. Then 

 comes a large supra-caecal kink. The cseca are vestigial, and the rectum is short and 

 straight. Another Circus (the species of whicli was not identified), Clrcaeius galUciis, 

 and Helotarsus ecaudatus all exhibited precisely the same conformation. 



Fix. 29. 



Intestinal Tract of Gijpoliierax angolennis. Lettering as before. 



(4) AquiUnd;. — 1 have examined Aquila anda.r, A. chrysaetus, A. Vei'reaitivi, Morj^hnios 

 guianensls. Spizacfns coronatiis, and Saliaetns alLicilla and H. leucogaster. I iiave 

 already described the conformation of the gut in tlie White-tailed Sea-Eagle (26. lig. 12). 

 The duodenum is A^ery long, being thrown into a complicated system of secondary folds. 

 Meckel's tract, also, is much elongated and its greater part is composed of a series of 

 short irregular loops suspended at the periphery of an oval stretch of mesentery, the apex 



