AUG 30 1SU2 



r 173 ] 



VII. On the Intestinal Tract of Birds ; with Remarks on the Valuation and Nonien- 

 clature of Zoological Characters. ByV. Chalmers Mitchell, M.A., D.Hc, Oxon., 

 F.L.S., F.Z.S., Lecturer on Bioloyij at the London Hospital Medical College. 



(Plates 21-23.) 



Kead 2U\ March, litdl. 



COXTENTS. _ 



Page 



Introduction 173 ; 



The Tract in I'alamedea cornuta as an Archecentrie Type J7.5 



Valuation and Nomenclaturo of Characters 1 7S 



Systematic Desckiption 1 82 



Eatitae 1.S2 



CarinatiE 184 



' Colynibiformes 18 J 



.Siiheiiiseifortues 186 



Procollarii formes 188 



f C'lcoinii'ormes 1 89 



\ Anserit'ormes 20] 



[ Falcouiformes . 2().j 



Summary of the Pelargo-Col}-nihomorphinc Brigade 2l:J 



Tinaniifnrmes 21.") 



G;dliformcs 210 



CiruiforDies 222 



Charadriil'ormes 230 



Summary of the Aleetoromorphine Legion 240 



(hieuliformes 242 



Coraoiiformcs 245 



{ Passeiiformes 2.52 



Summary of the Coraciomorphine Legion 2515 



Summary of the Systematic Description 2.")7 



Autonomic Nervous System 258 



Morphology of the Intestinal Tract 2fil 



Meckel's Diverticulum 2C2 



MeckeFs Tract 264 



Supra-duodenal Loop 265 



Colic Ca!ca 267 



Characters and Classifieation 27i> 



Bibliography 273 



Explanation of the I'lates 275 



Introductton. 



In 1813, in one of a series of papers on the Solvent Glands and Gizzards of 13irds, 

 Sir E. Home (15) gave a description and some measurements of the intestines in the 

 Ostrich, Emu, Cassowary, and Rhea; and in 181 i (16) the same avtthor described the 

 course of the intestines and the form of the caeca in a number of birds, giving figures, in 

 which, however, the coils were represented as freed from their blood-vessels and mesen- 

 teries. In the second edition of the ' Le90ns ' Cuvier (5) described the arrangement of the 

 intestinal tract in some dozen birds and distinguished regions, as the " duodenal loop " ; 



SECOND SERIES. — ZOOLOGY, VOL. VIII. 28 



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