PLATE 



EXPLANATION OF FIGURES 



9 Dissection of the heart of a foetus of about 85 mm., the right atrium and 

 right ventricle opened from the right side. The lateral wall of the inferior 

 vena cava (V.c.i.) and the right sinus valve (V.v.d.) have been divided by a 

 vertical cut and the parts somewhat separated. Magnified about 10 diameters. 



372 



