i82 The Alligator and Its Allies 



— cm 



mm 



regions of the intestine may be seen by comparing 

 Figures 47, 48, and 49. 



The serosa, s, which is of about the same character 

 in the three regions under discussion, is a distinct 



and fairly dense layer 

 of connective tissue 

 with numerous blood- 

 vessels. 



The general appear- 

 ance of the mucous 

 membrane as a whole 

 is sufficiently clear in 

 the low-power draw- 

 ing described above, 

 so that all that need 

 be shown under a 

 higher magnification 

 is the epithelium (Fig. 

 50). The upper part 

 of this figure repre- 

 sents the lower end of one of the intestinal 

 glands cut longitudinally, below which is the 

 end of another gland in transverse section. Be- 

 tween the two sections is the compact tunica 

 propria of lymphatic tissue. 



The section from which this particular figure 

 was drawn was in the anterior region, but the 

 corresponding part of a section in either of the 

 other regions would have practically the same 

 appearance. 



Fig. 48. An outline of a trans- 

 section of the wall of the middle 

 region of the small intestine of the 

 hibernating animal, under low magni- 

 fication; lettering as in Figure 42. 



