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BRUNER. 



DESCRIPTION OF FIGURES. 



A. Undivided atrium of lungless salamander. 



A.A. V. Atrio-ventricular aperture. 



A.D. Right auricle. 



A.S. Left auricle. 



S. Septum atriorum. 



S. V. Sinus venosus. 



T.A. Truncus arteriosus. 



V.C.D. Right vena cava. 



V.C.I. Vena cava inferior. 



V.C.S. Left vena cava. 



V.P. Pulmonary vein. 



V.S.A. Sinus-atrium valve. 



P.S. Spiral fold. 



