596 A. M. REESE 



evaginated portion had a deep longitudinal depression in the 

 center. Sections of this gland will be described below. 



Figure 37 shows a vertical section through a mandibular 

 gland that had been removed from a 1-meter alligator, freed 

 of all loose surrounding tissue, and cut, free-hand, through the 

 center with a razor. Cell details are not shown, the figure being 

 intended to show the shape of the gland, mg, and the enormous 

 mass of the wrinkled and folded evaginated material, ev. 



Figures 38 and 39 are vertical sections through the mandibular 

 gland of a 1-meter alligator, the former passing through the duct, 

 d, of the gland, the latter passing to one side of the duct. 



The greatly wrinkled epidermis, ep, covered with a loose 

 layer of horny material, /?, is seen to extend down into the duct, 

 d, of the gland where it is continuous with the main cell mass, 

 mg. Doubtless, part of the epidermis adjacent to the gland has 

 been pushed to the surface by the partial evagination process. 

 The capsule, cp, consists of a loose mass of connective tissue 

 and muscle fibers, the contraction of the latter doubtless caus- 

 ing the evagination of the gland. 



The central region of the gland consists of a mass of fibrous 

 tissue (fig 38, h, h'), continuous with the horny layer of the 

 epidermis. This central mass of tissue is loose and scattered 

 in the center, h', but is compact and dense peripherally, h. It 

 is quite sharply differentiated from the adjacent cells of the 

 gland, mg. 



The main body of the gland consists of a compact mass of 

 cells, mg, somewhat like those described in figure 35 and is broken 

 up into irregular lobules, as seen in figures 38 and 39, by strands 

 of deeply pigmented connective tissue from the capsule. The 

 cell details of these lobules will be discussed in connection with 

 the next and last stage of the gland. 



Figure 40, A and B, shows the shape and size of the submandib- 

 ular glands of the adult caiman and alligator, respectively. The 

 former animal, of which the species was not known, was about 

 1.6 meters in length. The alHgator was the American species 

 and was probably somewhat longer than the caiman, possibly 

 2.5 meters. It will be noticed that while the two glands are 



