8o4 



PHYLUM CHORDATA : CLASS MAMMALIA 



appear as slightly biconcave circular discs (elliptical in 

 Camelidae), but many good observers describe spherical 

 or cup-shaped or bell-shaped red blood corpuscles. It 



is not certain how far these 

 shapes are normal. The 

 four-chambered heart lies in 

 the thoracic cavity between 

 the lungs. It is surrounded 

 by a thin pericardium, and 

 immediatelv in front of it 



J?Scl 



J?A- 



B^ 



lil.v. 



Fig. 485. — Circulatory system of 

 the rabbit. 



{a) Letters to right — 



ex. External carotid. 

 i.e. Internal carotid. 

 e.j. External jugular. 

 scl.a. Subclavian artery. 

 scl.v. Subclavian vein. 

 p. 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. Coeliac artery. 

 a.m. Anterior mesenteric. 

 s.r.b. Suprarenal body. 

 l.r.a. Left renal artery. 

 l.r.v. Left renal vein. 



K. Kidney. 

 p.m. Posterior mesenteric artery 

 (inaccurately shown as if 

 paired). 

 spm. Spennatic arteries and veins. 

 c.il.a. Common iliac artery. 

 (6) 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. 

 R.V. Right ventricle. 

 I.V.C. Inferior vena cava. 

 r.r.a. Right renal artery. 

 r.r.v. Right renal vein. 

 s.r.b. Suprarenal body. 

 spm. Spennatic arteries and veins. 

 i.l. Ilio-hunbar vein. 

 f.v. Femoral vein. 

 i.il.v. Internal iliac veins. 



there Ues the soft thymus, which is larger in the young 

 than in the adult animal. 



By two superior venae cavse, and by the inferior vena cava, 



