The Digestive System 167 
the epithelium is greatly increased, and at the 
same time the horny layer is also thickened, to form 
distinct papilla like the one shown in the figure. 
These, as has been said, are comparatively small 
and have the shape of a blunt cone. The center of 
the cone is, of course, made up of the cellular 
epithelium, while the outside is covered with the 
thickened horny layer from which fibers, f, are 
often seen projecting. Near the apex of the cone 
the nuclei are larger and more widely scattered 
than those at the base. 
No glands were seen in the roof of the mouth 
of the hibernating animal, but since the entire roof 
was not sectioned it is probable that they may 
exist in some regions; in fact, as noted below, sec- 
tions through the posterior region of the roof of 
the mouth of the feeding animal do show numerous 
glands. 
As might be expected there is comparatively 
little difference between this region of the enteron 
during hibernation and during the feeding season. 
The only noticeable difference is in the stratified 
epithelium; that of the feeding animal not only has 
less sharp papillz but has also a much thinner scaly 
layer of cells. As is seen in the figure of the roof 
of the mouth during hibernation the scaly cells 
make up, except on the papille, nearly or quite 
half of the thickness of the epithelium, while in the 
feeding animal they make up not more than one 
fourth or one third of the entire epithelium. Very 
