190 The Alligator and Its Allies 
the feeding season is that the scaly epithelium with 
which it is covered is somewhat thicker and more 
compact in the former than in the latter condition, 
though even this difference may have been due to 
differences in the ages of the animals used. The 
base of the tongue differs from the tip in having 
a thicker epithelium and in having compound 
tubulo-alveolar glands. These glands in the hiber- 
nating animal have many more alveoli than in the 
feeding animal, though this, again, may have been 
due to the difference in age. 
The lining of the roof of the mouth is essentially 
the same as that of the tongue. The glands are 
found only in the posterior region. The slight 
differences in tho papille here found may easily 
be due to the difference in age. 
The cesophagus shows the usual layers for that 
region. Its epithelium is partly ciliated in the 
anterior part. The muscularis mucosa is very 
scant in the anterior region. The only difference 
between the two stages is that in the feeding the 
muscularis mucosa in the anterior region is much 
more strongly developed than in the hibernating 
stage; and in the former the nuclei of the epi- 
thelium are not arranged in two zones as in the 
latter. 
The stomach has the usual layers, and has es- 
sentially the same structure in the three regions 
studied, except that the wall in the fundic region 
is much the thickest, due mainly to the great 
