506 Intestinal Diverticula in Embryos of the Pig, Rabbit, and Man 
thelium of the vitelline veins, where they anastomose dorsal to the intes- 
tine. (Compare with Fig. 2.) 
At 7.8 mm. one very small knob was detected in a somewhat over- 
stained preparation (H. E. C. 428). Along the hepatic diverticulum 
toward the gall bladder there is a well defined pocket containing a lumen. 
Such pockets, closely resembling certain of the intestinal diverticula, are 
of common occurrence along the cystic ducts of embryos. Another pig of 
7.5 mm. (H. E. C. 29) shows three diverticula. These are all smaller 
and less definite than those in the younger stages. 
An embryo of 9.0 mm. (H. E. C. 52) shows a small anterior bud, and 
a large posterior one extending through five 10-p» sections. The latter 
Fic. 1. Reconstruction from a pig embryo of 5.5 mm. (H. E. C. 915). & 55 
diams. 
Fic. 2. Sagittal section (96) from a pig embryo of 5.5 mm. (H. E. C. 916). 
x 55 diams. Div., diverticulum. Panc. d., Pancreas dorsale. Panc. v., Pan- 
creas ventrale. St., Stomach. Ves. fel., vesica fellea. V. V., vitelline veins. 
is a pyriform structure, with the suggestion of an eccentric lumen in 
the last section; its connection with the intestine occurs in the first two 
sections. It contains four mitotic figures. 
Two embryos of 10.0 mm. were examined, both being rather heavily 
stained. One showed a single very small knob (H. E. C. 414); in the 
other no diverticulum could be found (H. E. C. 402). 
In a 12-mm. pig (H. E. C. 5) there is a bud, not very well defined. 
anterior to the dorsal pancreas. Posterior to the pancreas there is a 
detached nodule of epithelium seen in three sections. It contains a 
