-La 



FIG. 290. ABDOMINAL VISCERA AND AIR SACS OF A DUCK AFTER THE RE- 

 MOVAL OF THE VENTRAL BODY- WALL. (From a drawing by H. Strasser.) 



An* Va, innominate arter\^ and vein with their branches ; Ap, pulmonary artery ; 

 C, C, cervical sacs; Cd, coracoid ; D, intestine; D.th.a, oblique septum; 

 F, furcula ; H, heart, enclosed within the pericardium ; Ifcd, coraco-furcular 

 ligament ; Ly, Lg l , lung ; Ish, suspensory (falciform) ligament, and led, Ics, 

 right and left coronary ligament of the liver ; P, pectoralis major ; p, 

 axillary sac lying between the coracoid, scapula, and the anterior ribs, and com- 

 municating with the sub-bronchial air-sac ; pa, pv, pectoral artery and vein ; 

 r.Abd.S, l.Abd.S, right and left abdominal (posterior) air-sac; rL,lL, right 

 and left lobes of liver ; S, subclavius muscle ; s, s, partition walls between 

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

 anterior part of the body-cavity ; s 1 , s 1 , partition walls between the anterior 

 and posterior thoracic air-sacs ; T, trachea ; v, portion of anterior wall "of 

 the body-cavity; *, point of entrance of the bronchi into the lung; t, 

 anterior thoracic air-sac ; ft, posterior thoracic air-sac- . 



