1882. | ANATOMY OF ERETHIZON DORSATUS. 275 
of the liver; a conspicuous fold of small intestine lay towards 
the right side of the hinder part of the abdominal cavity, while 
the voluminous cecum occupied its middle and part of its hindmost 
portions. 
The small intestine measured 13 feet 3 inches. The large intestine 
measured 10 feet 9 inches—the whole intestine thus measuring 24 
feet. 
The diameter of the duodenum at its commencement is 3'"3 ; but 
at 2-5 (1 inch) from the pyloric valve it contracts to 2". 
"Stes 
The czecum of Erethizon dorsatus. 
Interior of the crecum, showing :—c, the ileo-cxcal valve; ¢, the valvular con- 
striction at the commencement of the large intestine ; and g/, the line of 
* glands extending between these two apertures. The colic pouch is the 
rounded prominence just beneath the letter ec. The glands enlarged are 
figured separately. 
The diameter of the ileum about 2'5 (1 inch) from the ileo-czecal 
valve is 1!"5. That of the colon at its first curve (just beyond the 
pouch of which its proximal end consists) is 3/3; but 17'8 (7 
inches) nearer the anus it is only 1'-8. 
The lower portion of the large intestine, however, is smaller in 
calibre than in the so-called small intestine. 
The villi of the small intestine are short, but delicate and close- 
set. There are a few solitary glands in the large intestine. 
In the small intestine there are seventeen Peyer’s patches—nine 
large and oval, and eight exceedingly small. 
In the first five feet of the large intestine there is a series of 
glands, from 1''-2 to 3!'-8 apart, situated along the free margin of 
