120 
JANE I. ROBERTSON. 
Text-fig. 26. 
Diagram illustrating the development of the lateral vitelline 
and subintestinal veins and of the portal system, a. Diagram 
of lateral vitelline veins. The approximate site of appearance 
of the liver is indicated by the dotted line. b, c and d. 
- Diagrams of latei’al vitelline and subintestinal veins. e. 
Diagram of the portal system. Cau. V. Caudal vein. D. C. 
Duct of Cuvier, li. Heart. H. P. V. Hepatic portal vessel. 
L. Liver. lat. V. V. Lateral vitelline vein. P. V. Pancreatic 
vein. P. V. C. Posterior vena cava. r. and 1. lat. V. V. Right and 
left lateral vitelline vein. P. V. Rectal vein. Si. V. sub- 
intestinal vein. Spl. V. Splenic vein. Sp. V. Spiral vein. 
jS. V. Sinus venosus. 
