74 



THE AMERICAN BEAVER. 



sickle. The follicular cavities in the coBcum and 

 colon, surrounded by columnar epithelium, give to the 

 surface a warty appearance. The reticulated or cel- 

 lular appearance of the colon is similar to what is 

 usually seen in this portion of the intestine. 



Fig. 7. 



CcBCUM 



Colon 



Ctecum of beaver. One-sixth natural size. 



The greatest width of the caecum is 4", and its 

 length, measured on its outer surface, is 2 feet 6". 

 The colon, measured from the circular band to the 

 rectum, is 7 feet 6". At its commencement there 

 are two longitudinal bands, forming numerous folds 

 and sacculi; after continuing 7", a third band starts 

 at an acute angle and continues 25", terminating as 

 it befican. The colon then diminishes in size, and in 

 place of cells is alternately expanded and contracted 

 to adapt itself to its contents. 



The liver is long, flattened, with two principal 

 lobes, two smaller ones, and several fissures. It is 

 hardly necessary to say that glucose is obtained from 

 it. The spleen is small, long and linear in form. In 



