PLATE XVI 



Fig. i. Transverse section, x 15, of first lamina of wax plug from 

 Balaenoptera physalus. OC, outer covering; /, islet of tissue; 

 CS, ceruminous space; CD, ceruminous duct. 



Fig. 2. Longitudinal section, x 15, of first and second laminae of wax 

 plug from Balaenoptera physalus. KE, keratinized epithelium; CL, 

 ceruminous layer; CD, ceruminous duct. 



Figs. 3 and 4. Diagrams of longitudinal sections of the first and second 

 laminae of the wax plug from Balaenoptera physalus showing the 

 suggested reason for the reversal of curvature of the tissues in the 

 second lamina. Fig. 3, the arrows indicate the pressure points of growth 

 during active formation of the squamous epithelium; Fig. 4, the arrows 

 indicate the pressure points of lipoids during the resting period. 



