PLATE 6 



EXPLANATION OF FIGURES 



37 Sketch of a free-hand section passmg vertically through the mandibular 

 gland of a 1-meter alligator. The gland was cut nearly through the median 

 plane. No cell details are shown 



38 Vertical section through the mandibular gland and its duct of a 1-meter 

 alligator, as seen under low magnification. 



39 Similar section to preceding, but passing to one side of the duct. 



40 A, surface view of mandibular gland of caiman sp. of about 1.6 meters' 

 length; no evagination of interior seen. X /. B, surface view of mandibular 

 gland of an alligator of probably about 2.5 meters' length. Marked evagination 

 of the internal structures shown. X /. 



41 Outline sketch of a mandibular gland of an alligator of about the size of 

 the one shown in figure 40, B. 



42 Cell details of the wall of the gland, between the parallel lines, pi, shown 

 in figure 41 



43 Highly magnified appearance of some of the yellowish secretion squeezed 

 from the mandibular musk gland of a 2.5 meters alligator. 



610 



