342 



INTERNAL ANATOMY OF HOESE. 



opening between the left auricle and ventricle by tbe mitral 

 valve, which has two flaps only. The auricular portion can be 

 told from the ventricular by an external constriction. From 



- -Ave. 



Fig. 1 !'."!. — Diagram of the Circulation of the Blood. 



T.A and RA, Lwfc and right auricles; V, ^■ent^icles ; L, luiiRs; Li, liver; 7, intes- 

 tines ; A.vc, anterior or superior vena cava ; F. t<c, posterior or inferior veua cava ; A. a, 

 aortic arcli ; ^.ao, P.oo, anterior and post^?rior aorta; i/a, hepatic artery ; //r, liejiaiic 

 vein; i'c, portal vein; Pu.A, pulmonary artery ; Pu.V, pulmonary veins ; Pc, posterior 

 capillaries ; '/ d, tlioracic duct. 



these chambers arise the blood-vessels. In the right auricle 

 (BA) we find three tubes — (i) the siijicrior reua cava {Arf) ; 

 (ii) the infciiur vena cava (P.vc) ; (iii) numerous small veins 



