672 



MAMMALIA. 



The pulmonary trunk divides into two pulmonary arteries, 

 which branch into capillaries on the walls of the lungs. 

 There the red blood corpuscles gain oxygen, and the blood 



is freed from much of the car- 



bonic acid gas which it has 

 borne away from the tissues. 

 The purified blood returns to 

 the heart by two pulmonary 

 veins, which unite as they 

 enter the left auricle. 



Fig. 239. — Circulatory system of 

 the Rabbit. {In part after Professors 

 Parker and Krause.) 



(«) Letters to right — 



e.c. External carotid. 

 i.e. Interna] carotid. 

 e.j. External jugular. 

 scl.a. Subclavian arterj'. 

 scLzK Subclavian vein. 

 J>.a. Pulmonary artery (cut short). 

 p.v. Pulmonary vein. 

 L.A. Left auricle. 

 L.V. Left ventricle. 

 d.ao. Dorsal aorta. 

 h.v. Hepatic veins. 

 c. Co^Iiac artery. 

 a.vt. Anterior mesenteric. 

 s.r.b. Supra-renal body. 

 Lr.a. Left renal arterj'. 

 Lr.v. Left renal vein. 



-AT. Kidney. 

 p.m. Posterior mesenteric artery. 

 spm. Spermatic artei-y and vein. 

 c.il.a. Common iliac arterj'. 

 (/') Letters to left— 



p.f. and a.f. Posterior and anterior 

 facial. 

 e.j. External jugular vein. 

 i.j. Internal jugular. \ 



R.Scl. Right subclavian artery. \ 



S.V.C. Superior vena cava. 

 R.A. Right auricle. i 



R.W Right Ventricle. ; 



/. V.C. Inferior vena cava. j 



r.r.a. Right renal artery. ; 



?-.r.v. Right renal vein. ! 



s.r.l). Supra-renal body. 

 spin. Spermatic artery and vein. 

 /./. llio-lumbar vein. 

 f.T. Femoral vein. 

 i.il.v. Internal iliac veins. 



From the left auricle, the pure blood passes into the left 

 ventricle through a funnel-like opening, bordered by a 



