ABSENCE OF THE VENA CAVA INFERIOR 403 
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V. mes. swpr., superior mesenteric vein; V. port., portal vein; V.subcard. dezt., 
right subeardinal vein; V. umbil. dext., right umbilical vein; V. vit., vitelline 
vein; x., intersubcardinal anastomosis; y., hepatic veins. 
Fig. 3 Model showing an abnormal arrangement of veins in a pig embryo of 
12mm. Magnification, 334. Lettering as in figure 2. 
