590 A. M. REESE 



of horny, scale-like cells like those of the superficial epithelium 

 with which theyare, of course, continuous. The wall of the duct 

 becomes continuous with the cell mass of the gland. 



The gland proper (fig. 19, eg) as was seen to be the case in the 

 preceding stage, is composed of a compact mass of cells, which 

 under the low magnification used in drawing figures 19, 22, 23, 

 and 24, exhibit a distinct radiate appearance, strands, st, of dif- 

 ferently stained cells radiating from the lumen of the gland 

 toward the periphery. The character of these cells will be 

 described later. 



The capsule, cp, consists of a mass of connective-tissue and 

 muscle fibers which is rather thin and fairly compact over the 

 gland proper, but is greatly thickened (as noted above) and 

 looser in character in the region of the duct. Owing to the 

 position of the duct, the surrounding connective tissue in this 

 region is much thicker on one side than on the other, as shown in 

 figures 19 and 22. This connective tissue consists largely of white 

 fiberSjWith numerous nuclei and small blood vessels. The muscle 

 fibers form a thin layer near the outer gland cells. 

 - At the base of the duct, to the left in figure 19, is a rounded 

 mass of fine granules, /, surrounding a small blood vessel; this 

 has the appearance of a lymph node. 



Transverse sections through the duct and fundus of the clo- 

 acal gland of a 32-inch caiman are shown in figures 22, 23, and 

 24. Figure 22 passed through the lower part of the duct, d, 

 just before it enters the gland proper, eg. The duct, which 

 exhibits the thick wall described above in connection with figure 

 19, contains a mass of lightly stained secretion. Surrounding 

 the duct is the loose mass of connective tissue, ct, which is 

 condensed around the periphery to form a more distinct zone 

 than was shown in figure 19 around the entire mass. 



Figure 23 passed through the upper part of the gland where 

 the lumen, lu, is large and partially filled with secretion. 

 The gland proper shows the radiating strands of more lightly 

 stained cells, mentioned in connection with figure 19, which are 

 wide near the lumen and taper sharply toward the periphery of 

 the gland. The capsule, cp, is very well marked. 



