J. L. Bremer 471 
vertical, fitting closely the sides of the entodermic intestine, which lies 
between them (Figs. 11 and 13). The lateral wall of each vitelline vein 
¢ 
is very irregular, giving off many branches, which join to form new longi- 
a) 
3 
2) 
1 
' 
' 
< 160. 
13. Model of veins near heart, from caudal end 
Fia. 
Revit weeseee 
[EUAUITe Vere ‘ <= 
tudinal channels, the whole making an irregular plexus. The plexus 
from the right vitelline vein is more developed than that from the left, 
and has even acquired an opening of its own into the sinus venosus 
