1882.] 



ORGANS OF APTERYX. 



Fig. 1. 



565 



Ks. 



Respiratory organs of Aiiteryx ; and Fig. 2, of a Duck having the trunk 

 of nearly the same dimensions. In each the vertebral column and 

 the left wall of the thoracic and abdominal cavities are supposed to 

 be removed ; while the median vertical septum, the right half of the 

 oblique septum, and the air-sacs of the right side are left. The 

 contour of the right lung is indicated. 



d. 1. dorsal margin of the limg; v. a. I, ventral angle of the lung; 

 I, prjBbronchial, II, infrabronchial, III, anterior intermediate, IV, 

 posterior intermediate, V, posterior air-sac; 1, 2, 3, dissepiments. 

 L. c, longus colli; V. s, vertical median septum ; o. s, oblique septvun 

 TV, trachea ; Ao, aorta ; c. a, cceliac artery ; m. a, mesenteric artery ; 

 K, kidney, m, smooth muscular fibres iu the oblique septum of the 

 Duck. 



