Fig. 88. 



Fig. 



Fig. 90. 



mm ' ,f 



llipl 





&>$ )#«H 



'*Pl 





Fig. 91. 



Fig. 92. 



Figs. 89 and 91, magnification, 72 x . Fig. 92, magnification, 220 x . Etched with am- 

 monia and hydrogen peroxide. 



