PLATE LVII. 



Class AVE S continual. 

 THE PIGEON continued. 



FIG. 1. CIRCULATORY SYSTEM: VENTRAL VIEW, x 1. 



o. 1 , a. 2 right and left auricles: v. l ,v. 2 right and left ventricles. 



a. aorta : i. innominate arteries : c. common carotid artery : v. 

 vertebral artery : i. c. internal carotid artery : e. c. external 

 carotid artery : b. brachial artery : p.c. pectoral artery : 

 i. m. internal mammary artery. 



coe. cceliac artery: s. m. superior mesenteric artery: r. l -r. s renal 

 arteries : /. femoral artery : sc. sciatic artery : i. i. internal 

 iliac artery and vein : c. caudal artery and vein : p. m. 

 posterior mesenteric artery and vein. 



/ jugular vein : vr. vertebral vein : b. v. brachial vein : p. v. pectoral 

 vein : s. r. 1 , s. v. 2 right and left superior vense cavre. 



c.m. coccygeo-mesenteric vein, joined by the posterior mesenteric 

 vein : r. p. renal-portal vein, formed by the coccygeo-mesen- 

 teric, caudal and internal iliac veins : sc. v. sciatic vein : /. v. 

 femoral vein : r. v. renal veins : i. v. iliac veins : ep. epigastric 

 vein : li. hepatic veins : v.c.i. inferior vena cava. 



p. a. left pulmonary artery. The right is seen crossing behind the 

 innominate arteries. 



