PLATE 3 



EXPLANATION OP FIGURES 



15 Section through the cloaca and penis of an embryo of about 15 cm. total 

 length, from tip of snout to tip of tail. The gland on the left side is cut through 

 its duct, d, that on the right to one side of the region where the duct, d, connects 

 with the gland, eg. 



16 Section through one cloacal gland, at a somewhat later stage of develop- 

 ment than the last. The distinct duct, d, and much-folded epithelium, ep, 

 are shown. 



17 A section along the line a-b in figure 16, drawn under magnification of 

 about 600 diameters, to show the character of the cells of the gland wall. 



18 A, cloacal gland of an 80-cm. caiman sp. , freed of loose surrounding tissue. 

 X Ik. B, cloacal gland of 1.6 m. caiman sp. X 11- 



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