r s.ijiM^. 



' Ish— 



r.AM.S.— 



1.AM.S. 



Fig. 237. — Abdominal Viscera and Air-Sacs of a Duck ai-teb the Re- 

 moval OF THE Ventral Body-Wall. (From a drawing by H. Strasser.) 



T, trachea ; H, heart, enclosed within the pericardium ; rL,lL, right and left 

 lobes of liver ; Ish, suspensory (falciform) ligament, and led, Ics, right and 

 left coronary ligament of the liver ; D, intestine ; P, pectoralis major ; pa, 

 pv, pectoral artery and vein ; S, subclavius muscle ; Od, coracoid ; F, furcula ; 

 Ifcd, coraco-furcular ligament; Lg, Lg^, lung; r.abd.S, I.abd.S, right and 

 left abdominal (posterior) air- sac ; D.tji.a, oblique septum; tt> posterior 

 intermediate air sac ; t, anterior intermediate air-sac ; s^, s^, partition-walls 

 between these sacs ; s, s, partition walls between the anterior intermediate 

 air-sacs and the unpaired sub-bronchial sac, lying in the anterior part of the 

 body-cavity ; v, portion of anterior wall of latter ; p, axillary sac lying 

 between the coracoid, scapula, and the anterior ribs, and communicating with 

 the sub-bronchial air- sac ; G, C, prebronchial sacs ; *, point of entrance of 

 the bronchi into the lung ; Ap, pulmonary artery ; Aa, Va, innominate artery 

 and vein with their branches. 



