260 



COMPARATIVE ANATOMY. 

 T 



Ifcd 



FIG. 209. ABDOMINAL VISCERA AND AIR-SACS OF A DUCK AFTER THE REMOVAL 

 OF THE VENTRAL BODY- WALL. (From an original drawing by H. Strasser.) 



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

 of liver ; Isk, suspensory (falciform) ligament, and led, Ics, right and left coronary 

 ligament of the liver ; D, intestine ; P, pectoralis mnjor ; pa, pv, pectoral artery 

 and vein : S, subclavius muscle ; Cd, coracoid ; F, furcula ; Ifcd, coraco-furcular 

 ligament ; Lg, Lg l , lung ; r.Abd.S, l.Abd.S, right and left abdominal (posterior) 

 air-sac ; D.th.a, the fibrous oblique septum ; ft, posterior intermediate air-sac ; 

 t, anterior intermediate air-sac ; s l , s 1 , 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 ; C, C, 

 prebronchial sacs ; *, point of entrance of the bronchi into the lung ; Ap, 

 pulmonary artery ; ^a-and Va t innominate artery and vein with their branches. 



