Fred W. Thyng 491. 
which has no lumen. The expanded basal portion of the triangle, situ- 
ated in the ventral mesentery, extends laterally to both sides, but chiefly 
to the right in an obliquely dorsal direction. It is closely applied to the 
ventral wall of the right vitelline vein. 
The dorsal pancreas (Pane. d.) is an outgrowth from the dorsal wall of 
the intestine nearly opposite the orifice of the hepatic diverticulum. It 
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fe 
N 
SG 
CLUE 
Fie. 2. Reconstruction from a pig embryo of 20 mm. (H. E. C. 60). 
«55 diams. Div., duodenal diverticulum. JD. chol., ductus choledochus. 
D. panc. d., dGuetus pancreatis dorsalis. D. panc. v., ductus pancreatis ven- 
tralis. Panc. acc., pancreas accessorium. Panc. d., pancreas dorsale. Panc. 
v., pancreas ventrale. St., stomach. #2, ventral process of the dorsal pancreas, 
on the right of the portal vein. 
is already of greater dimensions than the ventral pancreas. It extends 
dorsally in the great omentum, and sends a subdivision (a) to the right 
and ventrally, reaching the dorsal wall of the vitelline vein. The vein is 
thus being encircled on its right side by the two parts of the developing 
pancreas (Panc. d. and v.). 
4] 
